Co-reporter:Lili Yang, Gang Chen, Pengwei Huo, Ziyang Lu, Chunbo Liu, Yongsheng Yan
Materials Science in Semiconductor Processing 2016 Volume 44() pp:23-29
Publication Date(Web):15 March 2016
DOI:10.1016/j.mssp.2015.12.026
The effect of incorporating self-assembled monolayers of 4-methoxybenzoic acid (MBA) on CdS quantum dot-sensitized (QDSSC) solar cells based on ZnO nanorods was evaluated. The MBA was deposited on the ZnO photoanode, with the deposition time being a process variable. Photoluminescence spectra indicated that the MBA modification can suppress the photogenerated electron–hole recombination processes and presumably passivate the surface defects. The ultraviolet photoemission spectroscopy results prove that MBA forms an energy barrier at the interface of ZnO and CdS which may retard the back transfer of electrons. Overall the inclusion of MBA imparts a weak positive enhancement of the photovoltaic performance of these QDSSCs and this is an approach that may be developed to give stronger effects using alternative chemistries.
Co-reporter:Bo Chen, Juan Han, Yun Wang, Chengzhuo Sheng, Yu Liu, Guocai Zhang, Yongsheng Yan
Food Chemistry 2014 Volume 148() pp:105-111
Publication Date(Web):1 April 2014
DOI:10.1016/j.foodchem.2013.10.011
•A polymer-ATPS coupled with HPLC-UV was developed to determine three kinds of food samples.•Thermoseparating polymer was used to form ATPS, which made the separation and enrichment of ciprofloxacin more efficient.•Compared to other methods, lower and comparable LOD could be obtained in this method.•This method was satisfactory in the determination of food samples.•The components can be recycled more than two times to make the experiment more economical.Aqueous two-phase systems (ATPS) are potential industrial technology in separation and enrichment areas. However, the main problem is that ATPS could not be recycled, which results in a high cost and pollution of the environment. In this work, a new ATPS which formed by thermoseparating polymer EOPO with phosphate was developed for the separation and enrichment of ciprofloxacin (CIP). In the first procedure, the single factors have been discussed. The results showed that when the amounts of EOPO (80%, w/w) and K2HPO4 (55%, w/w) were 3.0 mL, 7.0 mL, respectively, pH = 11, the extraction efficiency of CIP could reach 97.7%. In the second extraction, with the temperature induced, the extraction efficiency of CIP showed 85.6%. Additionally, the phase components were successfully recycled and reused for more than two times. The new method was successfully applied to the determination of CIP in real samples with detection limits of 6.8 ng g−1.
Co-reporter:Chengzhuo Sheng, Juan Han, Yun Wang, Bo Chen, Yu Liu, Guocai Zhang, Yongsheng Yan, Xiaohong Zhao
Fluid Phase Equilibria 2014 Volume 364() pp:55-61
Publication Date(Web):25 February 2014
DOI:10.1016/j.fluid.2013.11.046
Binodal curves of 1-(2-methoxyethyl)-3-methylimidazolium bromide + potassium carbonate, potassium phosphate, dipotassium phosphate + water aqueous two-phase systems were determined experimentally at T = 288.15, 298.15 and 308.15 K, respectively. Effect of temperature on binodal curves was studied. Two empirical equations were used for reproducing the experimental binodal data. Effective excluded volume (EEV) theory was used to investigate the phase-forming strength of salts PO43−>HPO42−>CO32−. Additionally, the tie-line data were correlated by the Othmer-Tobias, Bancroft and Setschenow-type equations.
Co-reporter:Yu Liu, Juan Han, Yun Wang, Yang Lu, Guocai Zhang, Chengzhuo Sheng, Yongsheng Yan
Separation and Purification Technology 2013 Volume 118() pp:776-783
Publication Date(Web):30 October 2013
DOI:10.1016/j.seppur.2013.08.018
•An ethanol–inorganic salt ATPE enables a selective separation of flavones and sugars.•A Box-Behnken experimental design was used to optimize flavones extraction.•Multiple extractions and ethanol treatment are suitable for the further purification of flavones.•Compared to conventional method, high purity product could be obtained with ATPS.•The ethanol and salt are easy to recovery and recycling, thus being suitable for industrialized production.In the present study, ethanol/NaH2PO4 aqueous two-phase system (ATPS) was employed for the extraction and purification of flavones from honeysuckle. A Box-behnken design (BBD) was used to study the effects of salt concentration, ethanol concentration and pH on flavones partition behavior. The optimal system was found at pH 5.0, containing 4.6 g NaH2PO4 and 36% ethanol (v/v) with a Kflavones of 138 and more than 98% of the flavones in the top phase. Furthermore, the purity of flavones was enhanced from 8.86% to 22.88% by a two-step extraction, and further improved using a simple ethanol treatment to 48.73%. The ATPS showed a purity that was 4 times than that obtained by the 70% ethanol (v/v) extraction. The process turned out to be also applicable to other natural products.Graphical abstract
Co-reporter:Maobin Wei, Jian Cao, Hao Fu, Jinghai Yang, Yongsheng Yan, Lili Yang, Dandan Wang, Donglai Han, Lin Fan, Bingji Wang
Materials Science in Semiconductor Processing 2013 Volume 16(Issue 3) pp:928-932
Publication Date(Web):June 2013
DOI:10.1016/j.mssp.2013.01.022
ZnS:Cu2+ nanoparticles were synthesized by the solvothermal method. The results showed that the nanoparticles with the diameters of 10–20 nm were of cubic zinc blende structure. The Cu2+ ions were substitutionally incorporated into the ZnS lattice and the maximum concentration of the Cu2+ ions in the ZnS nanoparticles can reach to 2.84%. The ferromagnetism property of the ZnS:Cu2+ nanoparticles was observed around room temperature, which was explained by the super-exchange mechanism.
Co-reporter:Maobin Wei, Jinghai Yang, Yongsheng Yan, Jian Cao, Qinghui Zuo, Hao Fu, Bingji Wang, Lin Fan
Superlattices and Microstructures 2013 Volume 54() pp:181-187
Publication Date(Web):February 2013
DOI:10.1016/j.spmi.2012.11.018
The wurtzite-type ZnS:Fe2+ nanowires were prepared by a hydrothermal method at 180 °C without any surface-active agent. The results showed that the average diameter of the nanowires was about 10 nm. The Fe2+ ions were substitutionally incorporated into the ZnS host and the maximum concentration of the Fe2+ ions in the ZnS nanowires can reach to 5.81%. The absorption peak exhibited a small red-shift as the Fe doped ratio increased, which may be due to the increased size of the nanowires. After adding Fe2+ ions into the ZnS nanowires, no Fe-related emission peak can be observed and the emission intensity was quenched, indicating that the Fe2+ ions only acted as the nonradiative center. The ferromagnetism of the ZnS:Fe2+ nanowires was observed around room temperature, the mechanism of which was explained by the super-exchange mechanism.Highlights► The maximum concentration of Fe ions in the ZnS nanowires is 5.81%. ► The Fe2+ ions act as the nonradiative center for the ZnS:Fe2+ nanowires. ► We observe the room temperature ferromagnetism for the ZnS:Fe2+ nanowires.
Co-reporter:Yang Lu, Juan Han, Zhenjiang Tan, and Yongsheng Yan
Journal of Chemical & Engineering Data 2013 Volume 58(Issue 1) pp:118-127
Publication Date(Web):November 21, 2012
DOI:10.1021/je300955p
The binodal curves of the aqueous two-phase system (ATPS) containing the polyoxyethylene (10) lauryl ether (POELE10, C32H66O11) and three potassium salts (KOH/K2CO3/K3PO4) were determined at the temperatures (288.15, 293.15, 303.15, and 308.15) K. The three experience equations were used to fit the binodal data for the studied systems, and a satisfactory correlation effect was obtained. The effect of salts on the binodal curves for the investigated systems was discussed by the effective excluded volume (EEV), and we found that the salting-out effect is mainly influenced by valence of anion of salts. The salt containing the higher valence of anion has a stronger phase-forming ability than that with a lower charge of anion. The liquid–liquid equilibrium (LLE) data for the investigated systems were determined and correlated by the Othmer–Tobias and Bancroft equations. The effect of the change of temperature on the binodal curves and tie-lines was also studied through the analysis of the EEV values and cloud point (CP) figure. The increase in temperature leads to the strengthening hydrophobicity of POELE10 that drive more water transferring from the top phase to the bottom phase, which means the phase-forming ability of the whole systems was strengthened. Thus, the critical concentration of POELE10 and salts for forming ATPS decreases with the rising temperature.
Co-reporter:Zhenjiang Tan;Shan Song;Juan Han;Yun Wang
Journal of the Iranian Chemical Society 2013 Volume 10( Issue 3) pp:505-512
Publication Date(Web):2013 June
DOI:10.1007/s13738-012-0184-2
Ionic liquid aqueous two-phase flotation (ILATPF) is a green and effective separation and purification method, which combines solvent sublation and ionic liquid aqueous two-phase extraction system. This investigation attempts to study and optimize the partitioning conditions of chloramphenicol (CAP) in ILATPF. An experimental design of response surface methodology (RSM) was used to evaluate the influence of the variables, including the type of ionic liquid (IL), K2HPO4 concentration, flotation time and gas flow rate on CAP flotation. Quadratic polynomial models were adjusted to the data to predict the behavior of two responses, namely the partition coefficient (K) and sublation efficiency (E) of CAP. The optimal flotation conditions were found using [C6mim]Cl, 0.74 g/mL K2HPO4, 50 min flotation time and 50 mL/min gas flow rate, which ensured K = 405.71 and E = 93.16 %. It was observed that the effect of the four factors on K and E of CAP was flotation time > gas flow rate > the type of IL > K2HPO4 concentration. The ILATPF was proved effective for CAP separation in aqueous phase, and RSM was revealed to be an appropriate and powerful tool for experimental design of CAP separation by ILATPF.
Co-reporter:Juan Han;Yun Wang;Yan Liu;Yanfang Li;Yang Lu
Analytical and Bioanalytical Chemistry 2013 Volume 405( Issue 4) pp:1245-1255
Publication Date(Web):2013 February
DOI:10.1007/s00216-012-6511-8
Ionic liquid-salt aqueous two-phase extraction coupled with high-performance liquid chromatography with ultraviolet detection was developed for the determination of sulfonamides in water and food samples. In the procedure, the analytes were extracted from the aqueous samples into the ionic liquid top phase in one step. Three sulfonamides, sulfamerazine, sulfamethoxazole, and sulfamethizole were selected here as model compounds for developing and evaluating the method. The effects of various experimental parameters in extraction step were studied using two optimization methods, one variable at a time and Box–Behnken design. The results showed that the amount of sulfonamides did not have effect on the extraction efficiency. Therefore, a three-level Box–Behnken experimental design with three factors, which combined the response surface modeling, was used to optimize sulfonamides extraction. Under the most favorable extraction parameters, the detection limits (S/N = 3) and quantification limits (S/N = 10) of the proposed method for the target compounds were achieved within the range of 0.15–0.3 ng/mL and 0.5–1.0 ng/mL from spiked samples, respectively, which are lower than or comparable with other reported approaches applied to the determination of the same compounds. Finally, the proposed method was successfully applied to the determination of sulfonamide compounds in different water and food samples and satisfactory recoveries of spiked target compounds in real samples were obtained.
Co-reporter:Liang Wang, Hong Zhu, Chunhong Ma, Yongsheng Yan, and Qingwei Wang
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 3) pp:681-687
Publication Date(Web):February 3, 2012
DOI:10.1021/je2004758
Binodal data for the 1-ethyl-3-methylimidazolium dimethyl phosphate ([Emim]DMP) + salt (K3PO4, K2HPO4, and K2CO3) + H2O systems were experimentally determined at T = (298.15, 308.15, and 318.15) K, respectively. The Merchuk equation was used to correlate the binodal data. The abilities of the different salts for phase separation follow the order K3PO4 > K2HPO4 > K2CO3, which may be related to the Gibbs free energy of hydration of the ions (ΔhydG). The two-phase area expands with a decrease in temperature, whereas the slope of the tie lines slightly decreases with an increase in temperature. The reliability of the calculation method and corresponding tie-line data was described by the Othmer–Tobias and Bancroft equations, as well as the two-parameter equation. [Emim]DMP is a familiar ionic liquid, extensively used for the extractive desulfurization of fuel oils. This study is the first to report data on the phase diagrams of [Emim]DMP + salt + water systems.
Co-reporter:Juan Han, Yun Wang, Cuilan Yu, Yanfang Li, Wenbing Kang, Yongsheng Yan
The Journal of Chemical Thermodynamics 2012 Volume 45(Issue 1) pp:59-67
Publication Date(Web):February 2012
DOI:10.1016/j.jct.2011.09.004
(Liquid + liquid) equilibrium for the {1-ethyl-3-methylimidazolium tetrafluoroborate ([C2mim]BF4)/1-propyl-3-methylimidazolium tetrafluoroborate ([C3mim]BF4) + organic salt + H2O} aqueous two-phase systems (ATPSs) have been experimentally ascertained at T = 298.15 K. Three empirical equations were used to correlate the binodal data. On the basis of the empirical equation of the binodal curve with the highest accuracy and lever rule, the (liquid + liquid) equilibrium data were calculated by MATLAB. The reliability of the tie line compositions was proved by the empirical correlation equations given by the Othmer–Tobias and Bancroft equations. The effective excluded volume (EEV) values obtained from the binodal model for these systems were determined. The EEV and the binodal curves plotted in molality both indicate that the salting-out abilities of the four salts follow the order: Na3C6H5O7 > (NH4)3C6H5O7 > Na2C4H4O4 ≈ Na2C4H4O6, while the phase-separation abilities of the investigated ILs are in the order of [C3mim]BF4 > [C2mim]BF4. In the systems investigated, the effect of salts on the phase-forming capability was also evaluated in the shape of the salting-out coefficient obtained from fitting the tie-line data to a Setschenow-type equation. The phase-forming ability increases with the increase of salting-out coefficient.Highlights► We discuss the (liquid + liquid) equilibrium of (imidazolium ILs + organic salts) ATPSs. ► We correlate the binodal curves and the tie-lines using some appropriate equations. ► The salting-out ability is Na3C6H5O7 > (NH4)3C6H5O7 > Na2C4H4O4 ≈ Na2C4H4O6. ► The phase-separation abilities are in the order of [C3mim]BF4 > [C2mim]BF4. ► The phase-forming ability is increasing with the increase in salting-out coefficient.
Co-reporter:Yang Lu, Juan Han, Zhenjiang Tan, and Yongsheng Yan
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 8) pp:2313-2321
Publication Date(Web):July 12, 2012
DOI:10.1021/je3004468
The phase diagrams for the systems containing polyoxyethylene lauryl ether (Brij35) and K2HPO4/(NH4)2HPO4 have been determined experimentally at three temperatures, (288.15, 298.15, and 308.15) K. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium (LLE) data of these systems obtained by the experimental method were fitted by using Othmer–Tobias and Bancroft along with simple Setschenow-type equations. Furthermore, the effect of temperature on the binodal curve for the disquisitive systems has been discussed, and it was found that two-phase region expands with the increase in temperature, which is corresponded to the value of the effective excluded volume (EEV) calculated according to the binodal model. In the investigated systems, the free energy (ΔG), enthalpy change (ΔH), and entropy change (ΔS) were calculated, and it indicated that the phase separation processes are endothermic and driven by the entropy increase. That the slope of tie-line increases with the rising temperature was mainly caused by the hydrophobicity of Brij35 which changes with the temperature being varied.
Co-reporter:Xueqiao Xie, Yun Wang, Juan Han, Yongsheng Yan
Analytica Chimica Acta 2011 Volume 687(Issue 1) pp:61-66
Publication Date(Web):14 February 2011
DOI:10.1016/j.aca.2010.12.012
Based on the poly(propylene glycol)400 (PPG400)–salt aqueous two-phase system (ATPS), a green, economical and effective sample pretreatment technique coupled with high performance liquid chromatography was proposed for the separation and determination of sulfamethoxazole (SMX). The extraction yield of SMX in PPG400–salt ATPS is influenced by various factors, including the salt species, the amount of salt, pH, and the temperature. Under the optimum conditions, most of SMX was partitioning into the polymer-rich phase with the average extraction efficiency of 99.2%, which may be attributed to the hydrophobic interaction and salting-out effect. This extraction technique has been successfully applied to the analysis of SMX in real water samples with the recoveries of 96.0–100.6%, the detection limits of 0.1 μg L−1, and the linear ranges of 2.5–250.0 μg L−1.
Co-reporter:Xue Wang;Jianming Pan;Wei Guan;Xiaohua Zou;Pengwei Huo;Wei Hu
Journal of Separation Science 2011 Volume 34( Issue 22) pp:3287-3294
Publication Date(Web):
DOI:10.1002/jssc.201100358
Abstract
The magnetic molecularly imprinted polymers (MMIPs) have been synthesized using piperonal molecules as dummy template and magnetic wollastonite composites as support. The resulting composites were applied to selective recognition of sesamol from aqueous solution. MMIPs were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) analysis, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM). MMIPs were demonstrated with an imprinted polymer film (90–100 nm) and exhibited magnetic property (Ms=8.60 emu/g) and thermal stability. The effective average diameter of the Fe3O4 nanoparticles was about 10 nm and the thickness of magnetic film was about 160 nm. Batch mode adsorption studies were carried out to investigate the specific adsorption equilibrium, kinetics and selective recognition. The Langmuir isotherm model was fitted to the equilibrium data better than the Freundlich model, and the kinetic properties were well described by the pseudo-second-order equation. The value of Ea in this study was 5.35 kJ/mol for MMIPs. In addition, the selective recognition experiments demonstrated that MMIPs have specific recognition ability toward sesamol.
Co-reporter:Xiaohong Zhao, Xueqiao Xie, Yongsheng Yan
Thermochimica Acta 2011 Volume 516(1–2) pp:46-51
Publication Date(Web):20 March 2011
DOI:10.1016/j.tca.2011.01.010
Binodal data of poly(propylene glycol) PPG400 + salt ((NH4)2SO4, MgSO4, and KCl) + H2O systems were determined at T = 298.15 K, and binodal data of PPG400 + KAc + H2O system was determined at T = (298.15, 308.15, and 318.15) K. Moreover, the binodal curves were fitted to Merchuk equation, and the tie-lines were fitted to both the Othmer–Tobias and Bancroft equations. The effects of temperature and salts on the binodals and tie-lines of the investigated ATPSs were also studied. Finally, the salting-out ability of salts on the polymer was obtained by fitting the Setschenow-type equation to the tie-line data to derive a salting-out coefficient (kS) for each salt. For potassium salts, the relative effectiveness of the anions in inducing the phase segregation in ATPSs follows the Hofmeister series. The relative salting-out effectiveness of the sulfate salts is influenced by complexation of the cations by PPG.Research highlights► We determine the binodal/liquid–liquid equilibrium data of PPG400-salt ATPSs. ► We correlate the binodal curves and the tie-lines using some appropriate equations. ► The salting-out ability follows the order: K3PO4 > K2HPO4 > K2CO3 > KAc > KCl. ► The two-phase area increases with increasing temperature. The absolute values of slopes of the tie-lines are similar.
Co-reporter:Juan Han, Yun Wang, Yanfang Li, Cuilan Yu, and Yongsheng Yan
Journal of Chemical & Engineering Data 2011 Volume 56(Issue 9) pp:3679-3687
Publication Date(Web):August 23, 2011
DOI:10.1021/je2006055
Binodal data of the aqueous 1-alkyl-3-methylimidazolium tetrafluoroborate ([Cnmim]BF4, n = 2, 3, 4) + ammonium tartrate ((NH4)2C4H4O6) aqueous two-phase systems (ATPSs) have been determined experimentally at T = (288.15, 298.15 and 308.15) K. Three empirical equations were used to correlate the binodal data. The effect of temperature on the binodal curves was also studied, and it was observed that the biphasic region expanded with a decrease in temperature. The calculated effective excluded volume (EEV) and the binodal curves plotted in molality both indicate that the phase-separation abilities of the investigated ILs are in the order of [C4mim]BF4 > [C3mim]BF4 > [C2mim]BF4. On the basis of the empirical equation of binodal curve with the highest accuracy and lever rule, the liquid–liquid equilibrium data were calculated by MATLAB. The reliability of the tie-line compositions was proved by the empirical correlation equations given by Othmer–Tobias and Bancroft equations. Furthermore, a relatively simply two-parameter equation was successfully used to correlate the tie-line data. Finally, the slope of the tie lines decreases with an increase in temperature and increases with an increase in cation alkyl chain length of the investigated ILs.
Co-reporter:Cuilan Yu, Juan Han, Shiping Hu, Yongsheng Yan, and Yanfang Li
Journal of Chemical & Engineering Data 2011 Volume 56(Issue 9) pp:3577-3584
Publication Date(Web):August 22, 2011
DOI:10.1021/je200379r
Liquid–liquid equilibrium data have been determined for 1-ethyl-3-methylimidazolium tetrafluoroborate ([Emim]BF4)/1-propyl-3-methylimidazolium tetrafluoroborate ([Pmim]BF4) + trisodium phosphate (Na3PO4)/sodium sulfite (Na2SO3)/sodium dihydrogen phosphate (NaH2PO4) aqueous two-phase systems at T = 298.15 K, respectively. Two empirical equations were used to correlate binodal data. The Othmer-Tobias and Bancroft as well as Setschenow-type equations were used to correlate the tie-line data. The results show that good agreement was obtained with the experimental data. The effect of salt on the phase forming ability has been studied based on the effective excluded volume (EEV) values from fitting the binodal data to the binodal model. The binodal curves and EEV both indicate that the salting-out effect of the three salts follow the order Na3PO4 > Na2SO3 > NaH2PO4, which can also be related to the Gibbs free energy of hydration of the ions (ΔhydG) and [Pmim]BF4 is easier to be excluded the IL-rich phase than [Emim]BF4.
Co-reporter:Cuilan Yu;Juan Han;Yun Wang;Shiping Hu;Yanfang Li
Chromatographia 2011 Volume 74( Issue 5-6) pp:407-413
Publication Date(Web):2011 September
DOI:10.1007/s10337-011-2079-2
Room temperature ionic liquids are novel solvents with a rather specific blend of physical and solution properties that make them of interest for applications in separation science. In this study, a green, simple, and sensitive sample pretreatment procedure coupled with high-performance liquid chromatography (HPLC) was developed for the analysis of sulfadimidine (SM2) that exploits an aqueous two-phase system based on 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) and ammonium sulfate ((NH4)2SO4) using a liquid–liquid extraction technique in real environmental water samples. The influences of the concentration of (NH4)2SO4, pH value, temperature, and concentration of SM2 on the extraction efficiency of SM2 were determined. Under optimal conditions, the extraction efficiencies of SM2 were over 93.7%. Calibration curves yielded good linearity (R2 = 0.9998) over the range 3–240 ng mL−1, and the limit of detection and limit of quantification for analytes were 0.9 ng mL−1 and 3 ng mL−1, respectively. The proposed method was successfully applied to the quantification of SM2 in water samples and recoveries were in the range of 101.2–107%.
Co-reporter:Dandan Wang, Guozhong Xing, Xinying Wang, Dongmei Yin, Mi Zhou, Qing Guo, Jinghai Yang, Lili Yang, Jian Cao, Yongsheng Yan
Materials Research Bulletin 2011 46(6) pp: 937-940
Publication Date(Web):
DOI:10.1016/j.materresbull.2011.02.007
Co-reporter:Xue Wang, Jianming Pan, Wei Guan, Jiangdong Dai, Xiaohua Zou, Yongsheng Yan, Chunxiang Li, and Wei Hu
Journal of Chemical & Engineering Data 2011 Volume 56(Issue 6) pp:2793-2801
Publication Date(Web):April 29, 2011
DOI:10.1021/je101275e
A simple method for selective recognition of 3-chlorophenol (3-CP) from aqueous solution has been developed using a surface molecularly imprinted polymer (MIP) as sorbent. Characterization of the obtained MIP was achieved by Fourier transform infrared spectroscopy (FTIR). Kinetic, thermodynamic, dynamic adsorption, and selectivity experiments were investigated in this study. Kinetic experimental data were well-described by the pseudosecond-order kinetic model. The obtained Arrhenius activation energy Ea from the kinetic data indicated a physisorption mechanism, and the negative values of ΔHo demonstrated that the adsorption of 3-CP onto MIP was exothermic. Equilibrium experimental data of MIP fitted the Langmuir isotherm well. The MIP showed outstanding affinity toward 3-CP in aqueous solution, and the optimum pH value for binding has been found around the neutral range. When methanol was used as eluent, the adsorbed 3-CP eluted easily from MIP. The total dynamic capacity of the imprinted sorbent was calculated to be 1137.58 mg·g–1. The breakthrough of 3-CP started after 60 mL, and the breakthrough capacity was 756.8 mg·g–1. Meanwhile, selectivity experiments demonstrated that MIP showed high affinity to target molecules over competitive CPs (2,6-dichlorophenol and 2,4,6-trichlorophenol).
Co-reporter:Juan Han, Cuilan Yu, Yun Wang, Xueqiao Xie, Yongsheng Yan, Guowu Yin, Weixing Guan
Fluid Phase Equilibria 2010 Volume 295(Issue 1) pp:98-103
Publication Date(Web):15 August 2010
DOI:10.1016/j.fluid.2010.03.044
Binodal curves of the aqueous 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) + sodium citrate (Na3C6H5O7), [Bmim]BF4 + sodium tartrate (Na2C4H4O6) and [Bmim]BF4 + sodium acetate (NaC2H3O2) systems have been determined experimentally at 298.15 K. The Merchuk equation was used to correlate the binodal data. The effective excluded volume (EEV) values obtained from the binodal model for these three systems were determined. The binodal curves and EEV both indicate that the salting-out abilities of the three salts follow the order: Na3C6H5O7 > Na2C4H4O6 > NaC2H3O2. The liquid–liquid equilibrium (LLE) data were obtained by density determination and binodal curves correlation of these systems. Othmer–Tobias and Bancraft, and Setschenow equations were used for the correlation of the tie-line data. Good agreement was obtained with the experimental tie-line data with both models.
Co-reporter:Yun Wang, Xiaohui Xu, Yongsheng Yan, Juan Han, Zulei Zhang
Thermochimica Acta 2010 Volume 501(1–2) pp:112-118
Publication Date(Web):30 March 2010
DOI:10.1016/j.tca.2010.01.020
The phase-forming salts and their corresponding phase-forming abilities for 1-butyl-3-methylimidazolium-tetrafluoroborate ([Bmim]BF4)-based aqueous two-phase were discussed. The phase-forming abilities of (NH4)2SO4 and Na2CO3 for [Bmim]BF4-based aqueous two-phase were compared and discussed. Phase diagrams were experimentally determined for aqueous two-phase systems containing [Bmim]BF4 and (NH4)2SO4 at T = 298.15, 308.15, and 318.15 K. The Merchuk equation was used to correlate the binodal data of these systems. Simultaneously, the effect of temperature on the phase-forming ability in the investigated system has also been studied on the basis of a salting-out coefficient obtained from fitting the tie-line data to a Setschenow-type equation for each temperature.
Co-reporter:Yan Liu;Jie Gao;Chunxiang Li;Jianming Pan, ;Jimin Xie
Chinese Journal of Chemistry 2010 Volume 28( Issue 4) pp:548-554
Publication Date(Web):
DOI:10.1002/cjoc.201090110
Abstract
The surface-grafting ion-imprinting technology was applied to synthesis of a new Co(II)-imprinted polymer [Co(II)-IP], which could be used for selective removal of Co(II) from aqueous solutions. The prepared polymer was characterized by using the infrared spectra (IR), X-ray diffractometer (XRD), X-ray energy dispersion spectroscopy (EDS) and scanning electron microscopy (SEM). The maximum adsorption capacity values for the Co(II)-imprinted polymer and non-imprinted polymer (NIP) were 22 and 8 mg/g, respectively. The Freundlich equation fitted the adsorption isotherm data well. The applicability of two kinetic models including pseudo-first-order and pseudo-second-order models was estimated on the basis of comparative analysis of the corresponding rate parameters, equilibrium capacity, and correlation coefficients. Results suggested that chemical process could be the rate-limiting step in the adsorption process. And the adsorption of Co(II) on the Co(II)-imprinted polymer was endothermic. The relative selectivity coefficients of the Co(II)-imprinted polymer for Co(II)/Pb(II), Co(II)/Cu(II), Co(II)/Ni(II), Co(II)/Sr(II) and Co(II)/Cs(I) were respectively 11.5, 6.1, 13.8, 9.4, and 8.1 times greater than that of the non-imprinted polymer. Eventually, the desorption conditions of the adsorbed Co(II) from the Co(II)-imprinted polymer were also studied in batch experiments.
Co-reporter:Xueqiao Xie, Juan Han, Yun Wang, Yongsheng Yan, Guowu Yin, and Weisheng Guan
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 11) pp:4741-4745
Publication Date(Web):June 15, 2010
DOI:10.1021/je100356s
Experimental liquid−liquid equilibrium (LLE) binodal curves, tie-lines, and plait points were obtained for the PPG400 + salt (K3PO4, K2CO3, and K2HPO4) + H2O systems at T = 298.15 K. The Merchuk equation was used to correlate the binodal data of the investigated systems. Also, the effect of salt on the phase-forming ability has been studied based on the effective excluded volume (EEV) values from fitting the binodal data to the binodal model developed by Guan, and the salting-out abilities of the anions are in the order of PO43− > HPO42− > CO32−, which may be related to the Gibbs free energy of hydration of the ions (ΔhydG). Furthermore, tie-line compositions were correlated using the Setschenow-type, Othmer−Tobias, and Bancroft equations, and the parameters are reported.
Co-reporter:Xueqiao Xie, Yongsheng Yan, Juan Han, Yun Wang, Guowu Yin and Weisheng Guan
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 8) pp:2857-2861
Publication Date(Web):May 10, 2010
DOI:10.1021/je901019t
Liquid−liquid equilibrium data for the PPG400 (poly(propylene glycol)) + salt (potassium citrate, potassium tartarate, potassium oxalate) + water systems have been determined experimentally at T = (298.15, 308.15, and 318.15) K. The effects of temperature on the binodal curves and tie-lines were studied, and it was observed that an increase of the temperature generally led to an increase of the biphasic area. Furthermore, the binodal curves were fitted to a five-parameter equation relating the concentrations of PPG400 and salt. The effective excluded volume (EEV) values obtained from the binodal model were determined, and the salting-out ability of the anions follows the ordering citrate3− > tartarate2− ≈ oxalate2−. Finally, the Setschenow-type and Othmer−Tobias and Bancroft equations have been successfully used to correlate the tie-line compositions.
Co-reporter:Juan Han, Ru Pan, Xueqiao Xie, Yun Wang, Yongsheng Yan, Guowu Yin, and Weixing Guan
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 9) pp:3749-3754
Publication Date(Web):July 14, 2010
DOI:10.1021/je1002797
Binodal curves of the aqueous 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) + sodium citrate (Na3C6H5O7) and [Bmim]BF4 + ammonium tartrate ((NH4)3C6H5O7) systems have been determined experimentally at T = (298.15, 308.15, and 323.15) K. The Merchuk equation was used to correlate the binodal data. The effective excluded volume (EEV) values obtained from the binodal model for these two systems were determined. The binodal curves and EEV both indicate that the salting-out abilities of the two salts follow the order: Na3C6H5O7 > (NH4)3C6H5O7. It was demonstrated that the two-phase area was expanded with a decrease in temperature, while the slope of the tie lines slightly decreases with an increase in temperature. The liquid−liquid equilibrium (LLE) data were obtained by density determination and binodal curves correlation of these systems. The Othmer−Tobias and Bancroft and two-parameter equations were used for the correlation of the tie-line data. Good agreement was obtained with the experimental tie-line data with both models.
Co-reporter:Chunxiang Li, Juan Han, Yun Wang, Yongsheng Yan, Jianming Pan, Xiaohui Xu and Zulei Zhang
Journal of Chemical & Engineering Data 2010 Volume 55(Issue 3) pp:1087-1092
Publication Date(Web):September 9, 2009
DOI:10.1021/je900533h
Liquid−liquid equilibria (LLE) for the aqueous 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) + kosmotropic salt (Na3PO4, Na2CO3, Na2SO4, NaH2PO4, NaCl) systems have been determined experimentally at T= 298.15 K and in part at T = (313.15 to 333.15) K. The binodal curves are fitted to an empirical nonlinear expression developed by Merchuk, and the tie lines were described by the Othmer−Tobias and Bancroft equations. Factors affecting the binodal curves such as salts and temperature are also studied. It was found that the salting-out ability of different salts may also be related to the Gibbs energy of hydration of the ions, and the order of salting-out ability of the anions follows the Hofmerister series for the strength of the kosmotropic salts. It was also demonstrated that the two-phase area was expanded with a decrease in temperature. [Bmim]BF4 could be recovered from aqueous solution using the aqueous two-phase system (ATPS), and the recovery efficiency could reach 98.77 %. The recovery efficiency was influenced by the concentrations of the salts and their Homeister series: Na3PO4 > Na2CO3 > Na2SO4 > NaH2PO4 > NaCl. These data are exposed to be useful for the development and design of the extraction process using ILs based on the ATPS. This proposed method also provided an effective route for the recovery of hydrophilic IL from aqueous solutions.
Co-reporter:Xiaojie Zhang;Chunxiang Li;Jianming Pan;Pingping Xu
Microchimica Acta 2010 Volume 169( Issue 3-4) pp:289-296
Publication Date(Web):2010 June
DOI:10.1007/s00604-010-0352-y
A surface molecular imprinting technology was developed to adsorb Ce(III) ions that showed much higher adsorption affinity and selectivity for than for other metal ions. The batch adsorption process was studied with respect to effects of pH value, residence time, temperature, and initial concentration of Ce(III) ion. The maximum adsorption capacity is 43 mg g−1 at an initial Ce(III) concentration of 300 mg L−1 and at a sorbent dosage of 1.0 g L−1. A Langmuir isotherm fits the experimental data. The imprinted sorbent exhibits a much higher separation and selectivity for the target imprinted ion than the non-imprinted polymer. Cerium ion can be desorbed with 1M hydrochloric acid solution which is also proven by scanning electron microoscopy and X-ray diffraction experiments. The limit of detection is 37 ng mL−1. The sorbent has been applied to the determination of trace cerium in different environmental samples with satisfactory results.
Co-reporter:Chun-Xiang Li, Juan Han, Yun Wang, Yong-Sheng Yan, Xiao-Hui Xu, Jian-Ming Pan
Analytica Chimica Acta 2009 Volume 653(Issue 2) pp:178-183
Publication Date(Web):27 October 2009
DOI:10.1016/j.aca.2009.09.011
The ionic liquid, as a green solvent, has several advantages over the organic solvents in traditional liquid–liquid extraction. Aqueous two-phase system (ATPS) consisting of a hydrophilic ionic liquid (1-butyl-3-methylimidazolium tetrafluoraborate, [Bmim]BF4) and Na2CO3, which is a novel, simple, non-toxic and effective sample pretreatment technique coupled with molecular fluorescence spectrophotometry, was developed for the simultaneous separation, enrichment and rapid analysis of roxithromycin. The extraction yield of roxithromycin in [Bmim]BF4–Na2CO3 aqueous two-phase system is influenced by the types of salts, concentrations of Na2CO3 and [Bmim]BF4, as well as the extracting temperature. Under the optimum conditions, the average extraction efficiency is up to 90.7%. The mechanism of ionic liquid–salt ATPS formation was discussed by hydration theory, and the extraction mechanism of the [Bmim]BF4–salt ATPS was investigated by FT-IR spectroscopy and UV–vis spectroscopy. The results demonstrate that no chemical (bonding) interactions are observed between ionic liquid and roxithromycin, while the nature properties of the roxithromycin are not altered. This method was practical when applied to the analysis of roxithromycin in real water samples with the detection limit of 0.03 μg mL−1, relative standard deviation (RSD) of 1.9% (n = 13), and linear ranges of 1.00–20.00 μg mL−1. The proposed extraction technique will be promising in the separation of other small biomolecules.
Co-reporter:Huiqin Wang, Xiaoqing Yang, Jinzhao Zi, Mingjun Zhou, ... Yongsheng Yan
Journal of Industrial and Engineering Chemistry (25 March 2016) Volume 35() pp:83-92
Publication Date(Web):25 March 2016
DOI:10.1016/j.jiec.2015.12.023
•Ag/AgCl/AC plasmonic photocatalysts were successfully synthesized using the simple deposition and photoreduction method.•The degradation processes of TC with Ag/AgCl/AC photocatalyst should be better fitted the pseudo first kinetic equation.•The improved photocatalytic activity is mainly due to the surface plasmon resonance (SPR) by metallic Ag nanoparticles.Ag/AgCl/activated carbon (AC) plasmonic photocatalysts were prepared by precipitation and photoreduction method. The as-prepared plasmonic photocatalysts were characterized by XRD, SEM, BET, EDS, UV–vis DRS, XPS and PL. The results show the composite photocatalysts are successfully obtained and obviously exhibit surface plasmon resonance and effectively enhance the separation of h+/e−. The photocatalytic degradation rate of tetracycline (TC) could reach 97.3% in 60 min under visible light irradiation and cycled experiments show stably photocatalytic activities. The active species analysis displays holes and superoxide radicals are the main reactive species. Photocatalytic kinetic indicates that the degradation processes obey pseudo first order kinetic equation.Download full-size image
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