In this work, the propylene glycol monomethyl ether (PGME) + dimethyl sulfoxide (DMSO) system was used in absorption process of SO2, and the gas–liquid equilibrium (GLE) data of SO2 in the PGME + DMSO system were determined at T = 298.15, 303.15, and 308.15 K and p = 123.15 kPa. The experimental data are used to develop SO2 solubility model, which shows a potential application for SO2 removal. After that, Henry’s law constants (HLCs) were calculated by fitting the linear slope of solubility, and thermodynamic parameters were computed on the basis of the correlation of HLCs. The regeneration experimental results showed that 98.5% SO2 can be desorbed at 333.15 K and N2 bubbling in 12 min, and no significant loss of absorption capacity for absorption solvents. Additionally, FTIR, UV–vis, and 1H NMR spectra were recorded to discuss the interaction between SO2 and the binary systems of PGME + DMSO, and the results indicated that intermolecular hydrogen bonding association among PGME, DMSO, and SO2 was formed.

•Isothermal gas-liquid equilibrium (GLE) data at 298.15 K and 122.66 kPa•Henry's constants were calculated from GLE data.•Inter-molecular interaction among SO2, PEG, and DMSO were investigated.•Intermolecular hydrogen bonding and the O → S charge-transfer interactionIn a previous work, the binary mixture of polyethylene glycol 200 (PEG) and dimethyl sulfoxide (DMSO) was used as a promising medium for absorption of SO2 (J. Chem. Eng. Data2015, 60, 2135). As a continuation of the previous study, the solubility data of dilute SO2 in the binary mixture of PEG + DMSO were measured by isothermal gas-liquid equilibrium experiments at 298.15 K and 122.66 kPa with SO2 partial pressure below 128 Pa in the gas phase. The solubility of SO2 decreased gradually with increasing mass fraction of PEG in the mixtures. We found that the absorption process, which obeyed Henry's law within the given experimental conditions, was physical absorption, and Henry's constants were further calculated from solubility data. Furthermore, to obtain important information about the absorption mechanism, the inter-molecular interactions among SO2, PEG, and DMSO were investigated by UV, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interactions among SO2, PEG, and DMSO were resulted from both intermolecular hydrogen bonding and the O → S charge-transfer interaction.

We here report a new CO2 capture and storage method that converts CO2 into a novel alkyl carbonate salt, denoted as CO2SM, by a system consisting of equimolar 1,4-butanediol (BDO) and 1,2-ethylenediamine (EDA). This novel CO2SM was then used to prepare BaCO3 crystals through a simple and fast hydrothermal synthesis under mild conditions. The CO2SM was both the source of CO2 and the modifier to regulate the nucleation and growth of BaCO3 crystals. The morphology of the BaCO3 crystals could be tuned from rod to shuttle by adjusting the key influencing factors, including CO2SM concentration, mineralization temperature, and mineralization time. A possible mechanism for the synthesis of BaCO3 crystals from the CO2SM was also presented. After the BaCO3 crystals were isolated, the filtrate of the hydrothermal reaction could be recycled to again absorb CO2 and prepare BaCO3 crystals of the same polymorph. This novel approach appears promising for preparing well-formed metal carbonates.Download high-res image (104KB)Download full-size image

The work presents density (ρ) and viscosity (η) data of binary system polyethylene glycol 600 (PEG) + dimethyl sulfoxide (DMSO) over the entire concentration range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K and atmospheric pressure. On the basis of density and viscosity values, the excess properties of PEG (1) + DMSO (2) mixtures, including excess molar volume (VmE), viscosity deviation (∆ η), excess free energies of activation (∆ G*E), and isobaric thermal expansion coefficient (αp), were calculated. At the same time, in order to conjecture the density viscosity under different conditions, the density and viscosity data were fitted with the corresponding formula. The calculated results of VmE, ∆ η, and ∆ G*E were fitted with the Redlich–Kister equation to derive coefficients and estimate the standard deviations (σ) between the experimental and calculated values. Moreover, the intermolecular interaction of PEG with DMSO was discussed on the basis of FTIR and UV–Vis spectral results of PEG (1) + DMSO (2) mixtures. The results indicated that there were the hydrogen bonding and interactions of hydroxyl hydrogen atoms in PEG with oxygen atoms in DMSO.

The solubility of SO2 in binary mixtures of ethylene glycol (EG) and dimethylsulfoxide (DMSO), a potential candidate for use as the scrubbing liquid for the absorption of SO2 from flue gas, are lacking in the literature. The paper presents solubility data of dilute SO2 in these inexpensive solvent mixtures at T = (303.15, 308.15, and 313.15) K and p = 122.66 kPa. The solubilities of dilute SO2 in the mixtures increases gradually with increasing concentration of DMSO and decreasing temperature. The solubility of SO2 is linearly proportional to the experimental pressure. Meanwhile, the Henry’s law constants (Hx), dissolution enthalpy changes, dissolution entropy changes, and dissolution Gibbs energy changes were also obtained from the solubility data of SO2 in the mixtures. The experimental results demonstrate that the binary system of EG and DMSO is a promising alternative in SO2 separation processes due to its excellent absorption and regeneration performance.

In this study, novel rod-like and block-like CaO crystals were prepared after calcinating three types of CaCO3 precursors containing dumbbell-like, wheat spike-like and microsphere-like morphologies at 1000 °C for 3 h. The CaCO3 precursors were synthesized via the hydrothermal reaction of a CO2 storage-material (CO2SM) with Ca(OH)2 without additional additives. In the preparation process, CO2SM was not only used as a raw material but it also played the role of a directing agent. Moreover, as the major influence factors, CO2SM dosage, reaction temperature, reaction time and Ca2+ concentration were systemically investigated. Subsequently, the possible formation mechanism of the CaCO3 precursors was proposed. Finally, the as-obtained CaO crystals exhibit the adsorption amounts of 14.67, 16.32 and 7.50 mg g−1 for an 8% CO2/N2 mixture at 25 °C.

•Densities and excess volumes for the binary system of EDA + PPD were reported.•Viscosities and surface tensions for the binary system of EDA + PPD were determined.•Intermolecular interaction was discussed as CH3CH2(OH)CH2OH·NH2CH2CH2N(H2).Liquid densities, viscosities, and surface tensions play significant roles in fluid flow and industrial applications for CO2 capture. These data of 1,2-ethanediamine (EDA) + 1,2-propanediol (PPD) binary system were measured under atmospheric pressure at T = (293.15 to 318.15) K throughout the entire concentration range. According to the experimental viscosities and densities, the viscosity deviation and excess molar volume values were respectively calculated, and the Redlich-Kister equation was used to fit the coefficients and to evaluate the deviations. The system exhibited negative excess molar volume values with a minimum at x1 ≈ 0.54 at experimental temperatures, and a maximum was found at x1 ≈ 0.76 for viscosity deviation. The solubility of CO2 was measured at different flow rates, and the maximum solubility was about 0.57 g CO2 per 1 g EDA + PPD system at 250 mL/min CO2 flow rate. Furthermore, the intermolecular interaction of PPD with EDA was systemically discussed according to FTIR, UV–Vis, 1H NMR, and fluorescence spectral results, surface tension, and electrical conductivity data, and it was expressed as the form of HO-CH2(CH3)CH2O-H·NH2CH2CH2N(H2).

A modified SiO2 material (MSM) was successfully synthesized by using Na2SiO3 and a novel CO2SM in the presence of CTAB through an innovative hydrothermal releasing treatment protocol. The MSM was systemically characterized using several techniques, including N2 adsorption-desorption isotherm, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The CO2SM as a platform for CO2 capturing and releasing can be reversibly used for multiple cycles without significant loss of capabilities. The optimum conditions for the preparation of MSM were identified as follows: Na2SiO3 concentration, 0.2mol/L; hydrothermal temperature, 120 °C; CO2SM dosage, 6 g; CTAB concentration, 24 g/L, reaction time, 12 h. Additionally, the MSM exhibited high efficiency for the removal of phenol from aqueous solution: it showed a phenol adsorption capacity of 91.29mg/g when shaken with the aqueous phenol solution at 180 rpm for 1 h at 25 °C.

A novel, green, and economic CaCO3 synthesis method using a CO2-storage material (CO2SM) was developed based on the strategy of carbon capture, utilization, and storage (CCUS). In this process, CO2SM was used as both a CO2 source and a crystal modifier to regulate and control the crystallization of CaCO3. 1,4-Butanediol (BDO) and/or 1,2-ethanediamine (EDA) from CO2SM played unexpected roles as a surfactant, structure-directing agent, and/or pH modulator. The effects of CO2SM concentrations, reaction temperatures, and reaction times were systematically investigated. Pure calcite (bundle-like and dumbbell-like) and pure vaterite (oblate spheroid and snowball-like) CaCO3 products were obtained. Moreover, the CO2SM was recycled to prepare same crystal phase CaCO3 upon the addition of an appropriate amount of Ca(OH)2 with 120 g·L–1 CO2SM concentration.Keywords: Calcium carbonate; CO2 capture; CO2-storage material; Cycle preparation; Morphology control; Utilization and storage

A highly effective and economically feasible system for capturing CO2 was developed from 1,2-ethanediamine (EDA) + polyethylene glycol 300 (PEG), in which CO2 was activated and directly transformed to a novel solid CO2 storage material (CO2SM) under mild conditions. The essence of CO2SM is alkylcarbonate salt, and the potential applications of CO2SM would take advantage of elemental nitrogen to boost the growth of plants.. In addition, the EDA + PEG aqueous solution could be recycled multiple times without significant loss in its ability to capture and release CO2. Thus, the process offered an alternative way for comprehensive utilization of CO2 and potentially enables the CO2 conversion to a value-added chemical.

•The solubility for SO2 in binary system of polyethylene glycol 600 (PEG) + H2O•The binary mixtures have high solubility for SO2, and absorption obeys Henry’s law.•Experimental data for densities, viscosities, and surface tension at T = (298.15 to 323.15) K.•The calculated excess molar volumes are negative.•The intermolecular mechanism was discussed.Isothermal gas-liquid equilibrium (GLE) data were measured for dilute SO2 in the binary system polyethylene glycol 600 (PEG) + H2O at T = 298.15 K and p = 122.66 kPa, in which SO2 partial pressures were calculated in the range of (0 to 140) Pa. Based on the fitting GLE data, Henry’s law constants (Hx) of dilute SO2 in various PEG (1) + H2O (2) mixtures were obtained. Meanwhile, densities, viscosities, and surface tension of the binary system PEG (1) + H2O (2) were also measured over the whole concentration range at T = (298.15 to 323.15) K. From density and viscosity data, the excess molar volumes (VmE) and viscosity deviations (Δη) were calculated. Based on kinematic viscosity data, the enthalpy of activation for viscous flow (ΔH*) and entropy of activation (ΔS*) for the viscous flow were also obtained. Additionally, the important intermolecular interaction among PEG, H2O and SO2 were investigated using UV-Vis, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interaction between PEG and H2O resulted from hydrogen bonding, and the interaction of PEG with SO2 resulted from both the O → S charge-transfer interaction and intermolecular hydrogen bonding.

•Facile preparation of micro and nano-sized CaCO3 particles by CO2-storage material•CO2SM can be used as both CO32– source and crystal modifier to prepare CaCO3 crystals.•Filtered solution was recycled to generate CaCO3 micro-nano particles repeatedly.A facile method was designed to synthesize CaCO3 particles with spindle morphology and an average diameter of 300 nm from CaCl2 and CO2-storage material (CO2SM), in which CO2SM was used as both CO32– source and crystal modifier to prepare CaCO3 crystals. The effects of CO2SM concentration, Ca2 + concentration, and stirring time on crystallization behavior of CaCO3 were investigated. Except of the rapid production of CaCO3 particles, the filtered solution without CaCO3 precipitate could be reused to prepare CaCO3 particles with the additional CO2 and CaCl2. In addition, a self-assembly formation mechanism of vaterite CaCO3 particles also was proposed.

As a new, effective CO2 fixation system, 1,2-ethylenediamine and 1,2-ethylene glycol (EDA+EG) can efficiently activate CO2 and directly convert it into a novel CO2-storage material (CO2SM) with 46.3% yield. The aqueous CO2SM solution can react with Ca(OH)2-saturated limpid solution to generate morphology-controllable CaCO3 microparticles with additional CO2 bubbling and Ca(OH)2. Additionally, the aqueous EDA+EG solution could be recycled multiple times without significant loss of CO2 capturing and releasing capabilities.

In this work, isothermal gas–liquid equilibrium (GLE) data were measured for the mixture SO2 + N2 in the system of triethylene glycol (TEG) + dimethyl sulfoxide (DMSO) at T = (298.15, 303.15, and 308.15) K and p = 123.15 kPa. Henry’s law constants (HLCs) were obtained by fitting the linear slope of the GLE data. The results indicated that the solubility of dilute SO2 in the system of TEG + DMSO increased with the increasing DMSO concentrations, and HLCs decreased with the increasing temperatures. The regeneration experimental results showed that the absorption of SO2 in the binary system was reversible, and the solvent could be reused without significant loss of absorption capacity. Additionally, FTIR, UV–vis, and 1H NMR spectral results indicated that intermolecular hydrogen bonding association among TEG, DMSO, and SO2 molecules was formed.

Density and viscosity data for the binary system of 1,2-ethanediamine (EDA) + poly(ethylene glycol) 200 (PEG) at T = (303.15, 308.15, 313.15, 318.15, and 323.15) K were determined over the whole concentration range under atmospheric pressure as functions of composition. From the experimental data, the excess molar volume and viscosity deviation, respectively, were calculated and fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. At the same time, apparent molar volumes and partial molar volumes were also calculated. In addition, the intermolecular interaction of PEG with EDA is discussed on the basis of FTIR and UV–vis spectral results.

A green and template-free method was applied to control the morphology of CaCO3 microspheres with a layered nanostructure surface and pure crystalline phase of vaterite via the hydrothermal reaction between Ca(OH)2 saturated limpid solution and a novel CO2-storage material (CO2SM). Morphologies of the as-prepared CaCO3 crystals could be tuned with CO2SM concentration, reaction temperature, or crystallization time. After the precipitation of CaCO3 crystals, the filtered solution could not only be used to absorb CO2 but also to produce CaCO3 microspheres repeatedly with the addition of Ca(OH)2 solution. Furthermore, an aggregation and self-assembly mechanism for the formation CaCO3 microspheres had been proposed. As a result, this novel synthesis strategy of CaCO3 microspheres with CO2SM again emphasized that was possible to synthesize inorganic/organic hybrid materials with exquisite morphology and offered an alternative way for comprehensive utilization of CO2.Keywords: calcium carbonate; CO2 capture and utilization; CO2-storage materials; microspheres; mineralization; morphology control;

Different morphologies of CaCO3 micro-particles through a hydrothermal reaction between Ca(OH)2 saturated limpid solution and a new CO2-storage material (CO2SM), which was obtained from an equimolar system 1,2-ethylenediamine (EDA) + 1,2-ethylene glycol (EG) uptaking CO2, were presented without any additives. It's worth noting that the morphologies of the CaCO3 precipitates could be controlled as uniform sheaf-like (pure calcite) at the lower CO2SM concentration (0.6 g L−1) and homogeneous spherical-like (pure vaterite) at the higher CO2SM concentration (40 g L−1) for 1 h at 100 °C, in which the released EDA and/or EG from CO2SM had unexpected functions as surfactants. After the precipitation of CaCO3 crystals in 40 g L−1 CO2SM solution, the filtered solution could not only be reused to absorb CO2, but also to prepare the same crystal phase CaCO3 micro-particles repeatedly with the addition of Ca(OH)2. As a result, this novel synthesis process of CaCO3 micro-particles with CO2SM offers an alternative way for the comprehensive utilization of CO2.

•Density and viscosity data of EDA + BDO at (293.15 to 318.15) K were measured.•Excess properties for EDA + BDO mixtures were investigated.•Intermolecular interaction of EDA with BDO was discussed.Densities and viscosities were measured under atmospheric pressure over the entire concentration range for the binary system 1,2-ethanediamine (EDA) + 1,4-butanediol (BDO) at T = 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15 K as a function of composition. Based on density and viscosity data, excess molar volumes (VmE) and dynamic viscosity deviations (∆ν) were calculated. VmE and ∆ν values were correlated by a Redlich–Kister type function to obtain the coefficients and to estimate the standard deviation between the experimental and calculated quantities. Based on FTIR and UV–vis spectral results, the intermolecular interaction between EDA and BDO was discussed.

•An innovative approach was developed to prepare the porous silicate material from coal gangue.•The preparation method exhibited features of simple process and easily-obtained raw materials.•The optimum thermal and chemical activation conditions on SiO32− leaching were confirmed.•The optimum preparation conditions on the porous silicate material were confirmed.•The porous silicate material showed strong adsorption capability towards CO2.A novel porous silicate material (PSM) derived from coal gangue was successfully prepared and characterized by N2 adsorption–desorption isotherms, thermogravimetric analysis, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction measurements. The preparation procedure involved two steps: (1) SiO32− leaching from coal gangue by both activation and chemical approaches, and (2) preparation of the PSM by reaction of the leachate with Ca(OH)2. It was found that the maximum SiO32− leaching yield was achieved at calcination temperature of 1000 °C, reaction temperature of 106 °C for 2 h, NaOH concentration of 25%, and the ratio of coal gangue to alkali of 0.5:1. The PSM was then easily prepared from the SiO32− leaching at 98 °C for 2 h with a Ca/Si ratio of 1.2:1 and the pH value of 12.70. The spectroscopic results showed that the PSM was mainly composed C, Ca, O, Si and Na, in the form of Ca2+, Na+, SiO32−, and CO32− ions. Some adsorbed water and/or surface water was observed. The adsorption behavior revealed that the CO2 adsorbed amount on PSM was 36.69 mg g−1 at 293.15 k and ambient pressure with a pure CO2 flow rate of 120 mL min−1 during 90 min.SEM image of the PSM and TEM images of the PSM.

Isothermal gas–liquid equilibrium (GLE) data were measured at 298.15 K and 122.66 kPa for dilute SO2 in the binary system ethylene glycol (EG) + dimethyl sulfoxide (DMSO), in which SO2 partial pressures were calculated in range of (0–130) Pa. The solubility of dilute SO2 in the binary system gradually increased with the increasing DMSO concentration in the whole composition. Based on the GLE data, Henry’s law constants (HLC) of dilute SO2 in the binary system EG (1) + DMSO (2) were obtained. The regeneration experiments showed that the 97.6% SO2 could be separated from the dissolving SO2 solution at 80 °C and bubbling N2 within 30 min; meanwhile, SO2 desorption ran smoothly and solubility of SO2 no significant dropped after five-successive absorption–desorption cycles. Furthermore, to obtain important reaction mechanism, the intermolecular interaction among SO2, EG, and DMSO were investigated by UV–vis, FTIR, and 1H NMR spectroscopic techniques. Spectral results showed that the interaction among EG, DMSO, and SO2 were resulted from both the O → S charge-transfer interaction and intermolecular hydrogen bonding.

In this work, isothermal gas–liquid equilibrium (GLE) data were measured for dilute SO2 in the binary system N,N-dimethylformamide (DMF) (1) + diethylene glycol (DEG) (2) at T = (298.15, 303.15, 313.15, and 318.15) K and p = 122.66 kPa. Based on the GLE data, Henry’s law constants were obtained by fitting the linear slope of GLE data, and the thermodynamic parameters were calculated. The thermodynamic results showed that the dissolving processes of dilute SO2 in the binary system are spontaneous, enthalpy driving, and reversible behavior. When conventional UV, FT-IR, and 1H NMR spectroscopic techniques were used for inspection of spectral changes of dilute SO2 in the binary system DMF (1) + DEG (2), the spectral results suggest that hydrogen bonding and interaction of carbonyl oxygen atoms in DMF with hydroxyl hydrogen atoms in DEG were formed as HCO⋯HOCH2CH2OCH2CH2OH⋯, and the strong absorption capability of SO2 in the binary system can be due to the intermolecular S⋯O interaction as the formation HCO⋯(O)SO.

A highly stable silicate material from high-alumina coal fly ash was prepared and characterized using X-ray diffraction, scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, thermal analysis, X-ray photoelectron spectroscopy, and elemental analysis. The spectral results show that the silicate material was mainly composed of six elements, C, Ca, O, Si, Mg, and Al, in the form of Ca2+, Mg2+, Al3+, SiO32−, and CO32− ions. Some adsorbed water and/or water of crystallization was also observed. The silicate material showed exceptionally high capability to adsorb volatile organic compounds (VOCs). The results of dynamic adsorption behavior show that the silicate material presents similar properties with commercial activated carbon and stronger absorption properties than commercial diatomite for the adsorption of VOCs. The FTIR spectral results show weak hydrogen bonding interactions of the silicate material with three VOCs.

Density and viscosity data for the binary system diethylene glycol dimethyl ether (DEGDME) (1) + water (2) were measured at T = (293.15, 298.15, 303.15, 308.15, and 313.15) K under atmospheric pressure. Based on the experimental data, excess molar volumes (VmE), and viscosity deviation (Δν) values were calculated. The VmE values are negative, while the Δν values are positive over the entire composition range. The calculated results were fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations. Based on the kinematic viscosity data, enthalpy of activation for the viscous flow, entropy of activation for the viscous flow, and Gibbs energies of activation of the viscous flow were also calculated. Meanwhile, based on Fourier transform infrared spectral changes and UV–vis spectral changes for the binary system DEGDME + H2O with varied concentrations, intermolecular interaction of DEGDME with H2O was determined.

In a previous work, the binary mixture of ethylene glycol (EG) (1) + N,N-dimethylformamide (DMF) (2) was used as a promising medium for the absorption processes of SO2 ( J. Chem. Thermodyn. 2013, 62, 8−16). In this work, the desorption property and spectral changes of dilute SO2 in an ethylene glycol (EG) + N,N-dimethylformamide (DMF) binary system were studied to determine the possible intermolecular interaction of SO2 with DMF and DMF + EG. Desorption data showed that SO2 could desorb from the dissolving SO2 mixture, the 98% SO2 could be removed from the dissolving SO2 mixture, and the regenerate solution showed a similar SO2 absorption capacity with fresh solution. For determining the important interaction mechanism, conventional UV, Fourier transform infrared (FTIR), and 1H NMR spectroscopic techniques were used in absorption processes of SO2. Spectral results suggested that EG could interact with DMF by hydrogen bonds in the binary mixture by the -CH2CH2–OH···O═CH- bond; furthermore, SO2 could interact with DMF in various binary mixtures by the -HC═O···(O)SO bond.

In this paper, isothermal gas–liquid equilibrium data were measured for the system SO2 + N2 in N,N-dimethylformamide (DMF) + diethylene glycol (DEG) at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K and p = 122.66 kPa. Based on these data, Henry's law constants were obtained by fitting the linear slope of GLE data. The results indicated the solubility of dilute SO2 in the system DMF + DEG increases with increasing DMF concentration. From the GLE data of dilute SO2 in pure DMF and pure DEG, the thermal parameter of dissolving SO2 in pure DMF and pure DEG was obtained. Meanwhile, density, ρ, and viscosities, ν, for the binary mixtures of DMF + DEG were measured over the whole concentration range at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K. From the experimental density and viscosity data, the excess molar volume, VmE, and viscosity deviations, Δν, were calculated and the calculated results were fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE and Δν were negative at all experimental temperatures and components. From the kinematic viscosity data, enthalpy of activation for viscous flow (ΔH*), entropy of activation for the viscous flow (ΔS*), and Gibbs free energy of activation for viscous flow (ΔG*) were calculated.

Liquid densities and viscosities are reported for the binary system of 1,2-ethanediamine (EDA)+triethylene glycol (TEG) at T=(298.15, 303.15, 308.15, and 313.15) K. Densities were measured using a capillary pycnometer and viscosities were determined using an Ubbelohde capillary viscometer. The experimental results are compared with data published in the literatures. Based on the density data and kinematic viscosity data, excess molar volumes (VmE) and deviation in kinematic viscosity (Δν) were calculated and the calculated results were fitted to a Redlich-Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE are negative in the whole composition range, whereas the values of Δν are positive over the major composition range. From kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG*), enthalpy of activation for viscous flow (ΔH*), and entropy of activation for the viscous flow (ΔS*) were also calculated.

Gas–liquid equilibrium (GLE) data were determined for dilute SO2 in the binary system poly ethylene glycol 300 (PEG) (1) + dimethyl sulfoxide (DMSO) (2) at T = 298.15 K and p = 123.15 kPa, and SO2 partial pressures were found from (0 to 122) Pa. The GLE compositions were determined with ur(CSO2) = ± 0.6 % for the liquid phase SO2 concentration and ur(zSO2) = ± 5 % for the gas phase SO2 volume fraction. The measurement showed that dilute SO2 solubility in the PEG + DMSO mixtures decreased with the increasing PEG concentration. In the whole composition range, the pure DMSO showed the strongest solubility capability for dilute SO2 with 0.0756 mol·kg–1 and the solubility of SO2 in PEG was 0.0100 mol·kg–1 when the gas phase SO2 concentration (zSO2) was set at zSO2 = 5·10–4. In addition, the paper also reported densities and viscosities for the binary system PEG (1) + DMSO (2) as a function of composition. Based on the experimental density and viscosity data at T = (298.15 to 318.15) K, the excess molar volumes and viscosity deviations were calculated, and the calculated results were fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations. Based on the kinematic viscosity values, enthalpy of activation for viscous flow and entropy of activation for the viscous flow were also calculated.

In this work, magnesium tetraphenylporphyrin (MgTPP) was used as a new supramolecular amine-fixing agent. Once introduced, CO2 easily competes with MgTPP for amines, leading to the release of MgTPP. The processes can be explained by the fact that the association constant (Kassoc) values of MgTPP with amines were in the range of 0.6 (ethanolamine) to 3.9 (ethylenediamine), which are lower than the Kassoc values of CO2 with these amines. MgTPP interacted with aniline, ethanolamine, pyrrolidine, or ethylenediamine to form 1:1 adducts. Ethylenediamine presents a stronger Kassoc value for MgTPP, so it was considered an optimal agent for CO2 capture.Magnesium tetraphenyl porphyrin (MgTPP) serves as a renewable amine-fixing agent to reduce amine losses in CO2 capture.

•Gas–liquid equilibrium data of PEG 300 + water at (298.15–318.15) K and (110.34–142.03) kPa.•Henry's law constants were fitted based on the GLE data.•Enthalpy and entropy were calculated using the GLE data at different temperature.In this work, isothermal gas–liquid equilibrium (GLE) data are reported for the system of SO2 + N2 + polyethylene glycol (PEG) 300 + water (H2O) at five different reaction temperatures (from 298.15 to 318.15 K) and different pressures (from 110.34 to 142.03 kPa) with SO2 partial pressures in the range of 0 to 180 Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE data were obtained with uncertainties within ±0.02 K for temperature, ±0.1 kPa for total pressures, and ±0.05 for SO2 concentration in the gas phase and ±0.003 for SO2 concentration in the liquid phase. The measurements showed that the solubility of dilute SO2 in the system of PEG (1) + water (2) increased the with increasing PEG concentration in the mass fraction range of w1 = (0.50–1.00). The solubility of SO2 in the system of PEG (1) + water (2) presented an extreme minimum at the mass fraction of w1 = 0.50 of 152.3 g m−3 when SO2 in the gas phase was designed at ySO2=5×10−4ySO2=5×10−4. The solubility of dilute SO2 in the system of PEG (1) + water (2) increased with decreasing PEG concentration in the mass fraction range of w1 = (0.05–0.50). The solubility of SO2 in the system of PEG (1) + water (2) presented an extreme minimum at the mass fraction of w1 = 0.05 of 270.7 g m−3 when SO2 in the gas phase was designated at ySO2=5×10−4ySO2=5×10−4. Henry's law constants were fitted with a dynamic system based on the GLE data. Using the solubility data, the partial molar thermodynamic functions of solution, enthalpy and entropy, were calculated. Conclusions drawn from this work may be used to provide important GLE data for the design and operation of the absorption and desorption processes of PEG solutions in flue gas desulfurization.

Isothermal gas–liquid equilibrium (GLE) data were determined for dilute SO2 in a triethylene glycol (TEG) + water (W) system (TEGW) at 298.15 K and 123.15 kPa, in which SO2 partial pressures were calculated in the range 0–130 Pa. When La3+ was added into TEGWs, GLE data suggested that adding of La3+ ion markedly increased the solubility of dilute SO2. By fitting of these data, Henry’s law constants (HLC) were obtained. For acquiring the important absorption mechanism, UV, FTIR, 1H NMR, and fluorescence spectra in absorption processes of SO2 were investigated. On the basis of these spectral results, the possibility of intermolecular hydrogen bond formation by hydroxyl oxygen atoms in the TEG molecule with hydrogen atoms in the H2O molecule and S···O interaction formation by hydroxyl oxygen atoms in the TEG molecule with the sulfur atom in the SO2 molecule was discussed.

In this work, isothermal (gas + liquid) equilibrium (GLE) data were measured for the system SO2 + N2 + N,N-dimethylformamide (DMF) + Ethylene Glycol (EG) at T = 308.15 K and p = 122.66 kPa. Based on these data, Henry’s law constants were obtained by fitting the linear slope of the GLE data. The results show the solubility of dilute SO2 in the DMF + EG solutions increases with the increasing DMF concentration, and the solubility values range from 2.38 mol · m−3 (pure EG) to 47.2 mol · m−3 (pure DMF) when SO2 concentration in the gas phase is designed at ΦSO2ΦSO2 = 5 · 10−4. Meanwhile, the densities, ρ, and viscosities, ν, for the binary mixtures of DMF + EG were measured over the whole concentration range at T = (298.15, 303.15, 308.15, 313.15 and 318.15) K. The experimental results were compared with reported data in literatures. From the experimental density and viscosity data, the excess molar volumes, VmE, and viscosity deviations, Δν  , were calculated and the calculated results were fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE and Δν are shown to be negative at all experimental temperatures and compositions. From the kinematic viscosity data, Gibbs energies of activation of viscous flow (ΔG∗), enthalpy of activation for viscous flow (ΔH∗) and entropy of activation for the viscous flow (ΔS∗) were also calculated.Highlights► The solubility for SO2 in binary system of N,N-dimethylformamide + Ethylene Glycol. ► The binary mixtures have high solubility for SO2, and absorption obeys Henry’s law. ► Experimental data for the densities and viscosities at T = (298.15 to 318.15) K. ► The calculated excess molar volumes and viscosity deviations values are negative. ► The thermodynamic parameters of activation of viscous flow of the binary mixtures are evaluated.

This paper reports measurements of densities and viscosities for the binary mixtures of triethylene glycol (TEG) + water as a function of composition at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K. Densities were measured using a capillary pycnometer and viscosities were determined with an Ubbelohde capillary viscometer. The experimental results are compared with data published in the literatures. From the experimental data, including density and viscosity values, the excess molar volumes VmE, and viscosity deviations Δν, the calculated results are fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE are negative in the whole composition range, whereas the values of Δν are positive over the major composition range. From the kinematic viscosity data, enthalpy of activation for viscous flow (ΔH⁎) and entropy of activation for the viscous flow (ΔS⁎) were calculated.Highlights► Triethylene glycol + water was seen as a potential absorber for SO2 removal. ► Viscosities of Triethylene glycol + water at (298.15 to 318.15) K were measured. ► Excess volumes of Triethylene glycol + water at (298.15 to 318.15) K were listed.

Density was measured over the whole concentration range for the binary system of poly(ethylene glycol) 300 (PEG 300) + water at five temperatures from (298.15 to 318.15) K. The density (ρ  ) is fitted to calculate the excess molar volume (VmE) and viscosity deviation (Δη  ). The computed results are fitted to a Redlich–Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of VmE for all mixtures are negative, while the values of Δη are positive over the entire composition range.Highlights► Densities and excess volumes of PEG 300 + water at (298.15–318.15) K were listed. ► Viscosities of PEG 300 + water at (298.15–318.15) K were measured. ► Viscosity deviations of PEG 300 + water at (298.15–318.15) K were calculated.

Diethylene glycol (DEG) + H2O solutions (DEGWs) were used as the promising medium for the absorption processes of SO2. In this work, when UV, FTIR,1H NMR, and fluorescence spectroscopic techniques were used for inspection of spectral changes of DEGWs with increasing SO2 concentration, the results suggest that H2O can interact with DEG by hydrogen bonds as the formation of −CH2CH2O(H)...−HOH...− and −CH2−CH2−O(CH2−CH2−)...−HOH...− in DEGWs. Furthermore, SO2 can interact with DEG in various DEGWs by hydrogen bonds as the formation of −CH2CH2OH...−OSO...− and the intermolecular S...−O interaction in the absorption processes of SO2, which was not discussed in the previous similar systems. The results of this work can be used to provide an important absorption mechanism for the design and operation of the absorption and desorption process in flue gas desulfurization with potential industrial application of DEG aqueous solutions.

Isothermal (gas + liquid) equilibrium (GLE) data at T = 308.15 K and p = 122.60 kPa are reported for the absorption of dilute SO2 in various aqueous poly-ethylene glycol 400 (PEG) solutions, in which SO2 partial pressures are in the range of (0.9 to 92) Pa. Measurements are carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE data were obtained with uncertainties within 0.02 K for temperature, 0.1 kPa for total pressures, 3% for SO2 concentration in the gas phase, and 0.6% for SO2 concentration in the liquid phase. The measurements show that the solubility of dilute SO2 in the system of {PEG (1) + water (2)} increases with increasing PEG concentration in the mass fraction range of w1 = (0.40 to 1.00), and the solubility of SO2 in the system of {PEG (1) + water (2)} presents an extreme minimum at the mass fraction of w1 = 0.40 of 190 mg · L−1 when SO2 in the gas phase is designed at ΦSO2ΦSO2 = 5 · 10−4. The peculiarity of this work is used to provide important GLE data for the design and operation of the absorption and desorption process in flue gas desulfurization (FGD) with potential industrial application of the solutions containing PEG.Highlights► Isothermal (gas + liquid) equilibrium (GLE) data at T = 308.15 K and p = 122.60 kPa. ► Solubility of SO2 in pure PEG 400 presented an extreme maximum of 951 mg · L−1. ► Solubility of SO2 in w1 = 0.40 PEGW is an extreme minimum of 190 mg · L−1.

In previous work, poly(ethylene glycol) 400 (PEG) (1) + water (2) solutions (PEGWs) were used as a promising medium for the absorption processes of SO2. When conventional UV, Fourier transform infrared (FTIR), and 1H NMR spectroscopic techniques were used for inspection of spectral changes of PEGWs with increasing SO2 concentration, the spectral results suggest that H2O can interact with PEG by hydrogen bonds in PEGW; furthermore, SO2 can interact with PEG in various PEGWs by hydrogen-bonding interactions in the absorption processes of SO2. The results of this work can be used to provide important absorption mechanism for the design and operation of the absorption and desorption process in flue gas desulfurization (FGD) with potential industrial application of PEG aqueous solutions.

The photochemical reaction of magnesium tetraphenyl porphyrin (MgTPP) with sulfur dioxide (SO2) was investigated in dichloromethane (CH2Cl2) by steady-state fluorescence, UV–vis absorption, MS, and XRD spectroscopic techniques. These spectra showed that under irradiation MgTPP reacted with SO2 to form 1:1 molecular adduct at first step. During the process of keeping irradiation and maintaining the flow of SO2, SO2 was reduced into S2− by MgTPP and the results were detected using MS and XRD techniques. Understanding the photochemical reaction of MgTPP with SO2 is of key interest in elucidating fundamental photochemical reaction mechanisms associated with this class of chlorophyll in the presence of SO2.

Solubility data were measured for carbonyl sulfide (COS) in the binary system of ethylene glycol (EG) + water at (308.15, 313.15, 318.15, and 323.15) K. Measurements were carried out by a saturation method using a glass equilibrium cell, which was controlled at constant temperatures by a thermostatic bath with a Beckmann thermometer. The solubility data were obtained with uncertainties within ± 0.02 K for temperature and ± 0.133 kPa for system pressure, and the solubility data of COS in various ethylene glycol−water solutions (EGWs) were obtained with a maximum errorr with 3.88 %. Using the calculated method, the solubility of COS is acquired in various EGWs at the same temperatures and 0.10132 MPa. The results of this work can be used to provide important solubility data for the design and operation of the absorption process for COS with potential industrial application of various EGWs.

Isothermal gas−liquid equilibrium (GLE) data have been measured for the system diethylene glycol (DEG) (1) + water (2) + SO2 (3) + N2 (4) at 298.15 K and 123.15 kPa and SO2 partial pressures in the range of (0.7 to 100) Pa. Measurements were carried out by a saturation method using a glass absorption apparatus, which was controlled at constant temperatures by a thermostatic circulation bath with a Beckmann thermometer. The GLE compositions were obtained with relative uncertainties within ± 0.6 % for SO2 concentration in the liquid phase and ± 3.5 % for SO2 mole fraction in the gas phase. The measurement showed that the system DEG (1) + water (2) in the mass fraction range of w1 = (0.60 to 1.00) decreased the solubility of SO2 and the system DEG (1) + water (2) in the mass fraction range of w1 = (0.00 to 0.60) increased the solubility of SO2. Compared with our previous work (Zhang, J. B.; Wei, X. H.; et al. J. Chem. Eng. Data 2008, 53, 2372−2374; Zhang, J. B.; Wei, X. H.; et al. J. Chem. Eng. Data 2009, DOI: 10.021/je900392e), the solubility of SO2 in pure DEG is 259 mg·L−1 when SO2 volume fraction in the gas phase is Φ3 = 5·10−4, which is higher than in pure ethylene glycol (EG, 128 mg·L−1) and lower than in pure poly(ethylene glycol) 400 (PEG 400, 1330 mg·L−1). The results of this work can be used to provide important GLE data for the design and operation of the absorption and desorption process in flue gas desulfurization (FGD) with potential industrial application of various PEG aqueous solutions.

Density (ρ) and viscosity (η) were determined over the whole concentration range for the binary mixtures of 1,2-diaminoethane + 1,2-ethanediol at (298.15, 303.15, and 308.15) K. The experimental results are compared with data published in the previous literature. The density values were used to calculate the excess molar volume (VmE). The calculated results are fitted to a Redlich−Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and the calculated quantities. The values of VmE are negative over the entire composition range.

A desulfurization strain that belongs to the thermophilic alkaline desulphuricant is designated as strain GDJ-3 and isolated from Inner Mongolia, China. The colony of the strain shows tiny, yellow, or white-yellow, and it becomes henna with the protracting of cultivated time. The cells are bacilliform (0.3−0.6 × 1.0−1.2 μm), motive, and Gram negative. The strain GDJ-3 is able to utilize respectively the thiosulphate, sulfate, sulfite, or sulfide as sulfur source, utilize the carbon dioxide as the carbon source, and utilize the ammonium or nitrate as the nitrogen source. According to GenBank data, 16s RNA results of GDJ-3 are in good agreement with Alpha proteobacterrium sp. (97%) and Ochrobactrum sp. (98%). For GDJ-3, the optimum growth temperature is at 45°C, the optimum pH is at 8.5–8.8, and the optimum rocking speed of sorting table is at 150 r/min. Under the optimum culture condition, the cells of the strain can live for about 18 h. In the desulfurization solution, which is prepared according to the composition of DDS solution, the objectionable constituents of sodium thiosulphate and sodium sulfide were added factitiously, and the bacterial cell concentration was set at 107/mL. After the regeneration of the above desulfurization solution by the strain cells, the concentration of sodium thiosulphate was decreased by 14.75 g/L (percentage loss of content 13.21%), the concentration of sodium sulfide was decreased by 0.76 g/L (percentage loss of content 87.36%) in the desulfurization solution in 9.5 hours, and sulfur appeared. Maybe, this kind of strain can be used as the regeneration’s bacterial source of DDS solution.

•Vaterite CaCO3 was prepared without any outside additives besides the reactions.•CO2 Storage Material (CO2SM) and carbide slag were used to prepare CaCO3.•Ethylenediamine and/or ethylene glycol from the CO2SM was used as surfactants.•After precipitation, the filtered solution could circularly prepare CaCO3.A facile and direct hydrothermal method for the crystallization of vaterite CaCO3 micro-spheres in the presence of carbide slag saturated limpid solution and a new CO2-storage material (CO2SM), which was obtained from an equimolar system of 1,2-ethylenediamine (EDA) + 1,2-ethylene glycol (EG) uptaking CO2 (ChemPhysChem., 16 (2015) 2106), was presented without any outside additives. It’s worth noting that the morphologies of CaCO3 precipitates could be controlled as homogeneous spherical-like (pure vaterite) at the 100 g L−1 CO2SM concentration for 90 min at 100 °C, in which released EDA and/or EG from the CO2SM was used as surfactants. After the precipitation of CaCO3 crystals in 100 g L−1 CO2SM solution, the filtered solution could not only be reused to absorb CO2, but also to prepare the same crystal phase CaCO3 micro-particles repeatedly with the addition of carbide slag. Thus, this novel synthesis process of CaCO3 micro-particles with carbide slag and the CO2SM offers an alternative way for the comprehensive utilization of CO2 and the solid waste carbide slag.

•Densities and excess volumes for the binary system of BTD (1) + EDA (2) were reported.•Viscosities for the binary system of BTD (1) + EDA (2) were reported.•Intermolecular interaction was discussed as ⋯ HOCH(CH3)CH2CH2OH ⋯ NH2CH2CH2N(H2).In our recent work, the binary system of 1,3-butanediol (BTD) (1) + 1,2-ethanediamine (EDA) (2) shows strong solubility to CO2 with 0.7551 mol CO2 per mol EDA. In this work, as important thermodynamic properties, densities (ρ) and viscosities (η) of the binary system of BTD (1) + EDA (2) at T = (298.15, 303.15, 308.15, 313.15, and 318.15) K were carefully measured as a function of composition over the whole concentration range under atmospheric pressure. Based on the experimental ρ and η data, the excess properties of the BTD (1) + EDA (2) mixtures, including excess molar volume (VmE) and viscosity deviation ∆ η, apparent molar volume (Vφ,1 and Vφ,2), partial molar volume (V1¯and V2¯), and isobaric thermal expansion coefficient αρ were systemically investigated. Meanwhile, the Redlich-Kister equation was used to fit with VmE and ∆ η, the optimal fitting coefficients were obtained, and the standard deviations σ between the experimental and calculated quantities were evaluated. Additionally, the intermolecular interaction of BTD with EDA was expressed as the N ⋅⋅⋅H hydrogen-bonding interaction with the form of ⋯ HOCH(CH3)CH2CH2OH ⋯ NH2CH2CH2N(H2)⋯ on the basis of UV–vis, FTIR, 1H NMR, and Fluorescence spectral results and electrical conductivity of BTD (1) + EDA (2) mixtures.