Co-reporter:Yali Cui, Yuanqiang Hao, Yintang Zhang, Baoxia Liu, Xu Zhu, Peng Qu, Deliang Li, Maotian Xu
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2016 Volume 165() pp:150-154
Publication Date(Web):5 August 2016
DOI:10.1016/j.saa.2016.04.011
•A novel retrievable ruthenium-based colorimetric probe was developed for recognition of Hg(II) and Cys.•The probe possesses highly sensitivity and selectivity towards the targets.•The constructed probe displays excellent water-solubility.A new ruthenium-based complex 1 [(bis(4,4′-dimethylphosphonic-2,2′-bipyridine) dithiocyanato ruthenium (II))] was developed as a colorimetric probe for the detection of Hg(II) and Cys (Cysteine). The obtained compound 1 can give interconversional color changes upon the alternating addition of Hg(II) and Cys in 100% aqueous solution. The specific coordination between NCS groups with Hg(II) can lead to the formation of 1-Hg2 + complex, which can induce a remarkable spectral changes of probe 1. Afterwards the formed 1-Hg2 + complex can act as effective colorimetric sensor for Cys. Owing to the stronger binding affinity of sulfhydryl group to Hg2 +, Cys can extract Hg2 + from 1-Hg2 + complex resulting in the release of 1 and the revival of absorption profile of the probe 1. By introducing the hydrophilic phosphonic acid groups, the proposed probe exhibited excellent water solubility. The limits of detection (LODs) of the assay for Hg2 + and Cys are calculated to be 15 nM and 200 nM, respectively.
Co-reporter:Bing Cui; Jing-Chao Gong; Mu-Hua Duan; Zhi-Xian Chang; Ling-Ling Su; Wen-Jing Liu
Journal of Chemical & Engineering Data 2016 Volume 61(Issue 2) pp:813-819
Publication Date(Web):January 27, 2016
DOI:10.1021/acs.jced.5b00636
In this work, the reactive extraction equilibrium of p-nitrophenol (PNP) using tributylphosphate (TBP) dissolved in solvent naphtha and n-octanol has been studied, respectively. The effects of equilibrium pH (pHeq), initial TBP, and PNP concentrations on the distribution ratio (D) and the degree of extraction were discussed. The TBP/solvent naphtha showed higher D values than that of TBP/n-octanol. The larger D values were also observed at pHeq in the range of 2–5.5. pHeq had negligible influences on the structure of TBP/PNP complexes based on IR spectra analysis. TBP mainly reacted with the neutral form of PNP by forming 1:1 (TBP/PNP) complexes through a hydrogen bond between phosphoryl in TBP and hydroxyl in PNP. The model parameters were calculated by fitting the experimental data. D values calculated from the model were in good agreement with experimental ones. In addition, the back-extraction rate was found to be reached 99.9% using 50 mmol·kg–1 NaOH as stripping agent.
Co-reporter:Deliang Li, Lingling Li, Wei Guo, Zhixian Chang, Minghua Lu
Materials Science in Semiconductor Processing 2015 Volume 31() pp:530-535
Publication Date(Web):March 2015
DOI:10.1016/j.mssp.2014.12.024
In this work, a novel Mo–Sb–S tridoped TiO2 nanoparticles possessing enhanced visible light photocatalytic activity were prepared by a sol–gel method. The as-prepared catalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy, energy dispersive X-ray, nitrogen adsorption–desorption isotherms, and UV–vis diffuse reflectance spectroscopy. The results of XRD and TEM indicated that the average size of Mo–Sb–S tridoped TiO2 nanoparticles was approximately 8–9 nm, which is smaller than that of TiO2 co-doping or doping with Mo, Sb and S (11–16 nm). The photocatalytic activity of Mo–Sb–S tridoped TiO2 nanoparticles was evaluated by photodegradation of methylene blue (MB) in aqueous solution under visible light irradiation. The results revealed that the prepared Mo–Sb–S tridoped TiO2 nanoparticles possess excellent performance on degradation of MB. By analyzing the structure and photocatalytic activity of Mo–Sb–S–TiO2 under visible light irradiation, the probable mechanism of tridoped TiO2 for enhancing visible light photocatalytic activity was postulated that the co-operation of metal elements Mo and Sb as well as nonmetal elements S not only led to appreciable narrowing of the band gap, but also suppressed the recombination of the photo-generated electrons and holes, thus greatly improved the photocatalytic activity under visible light irradiation.
Co-reporter:Deliang Li, Jing Wang, Xu Wu, Caixia Feng, Xiaohong Li
Ultrasonics Sonochemistry 2013 Volume 20(Issue 1) pp:133-136
Publication Date(Web):January 2013
DOI:10.1016/j.ultsonch.2012.05.017
Well-defined hexagonal hourglass-like ZnO microstructures have been synthesized by using simultaneous ultrasound and microwave irradiation methods with the assistance of ultraviolet as well as double sonication (at 25 and 40 kHz). The structure and morphology of as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy and photoluminescence spectrum. The results show the synergistic effect of ultrasound and microwave on the formation of ZnO microstructures. Meanwhile, the possible growth mechanism was proposed to elucidate the formation of hexagonal hourglass-like ZnO microstructures.
Co-reporter:De-Liang Li, Yuan-Yuan Guo, Zhi-Xian Chang, Fei Yu, and Xiao-Li Feng
Journal of Chemical & Engineering Data 2013 Volume 58(Issue 3) pp:731-736
Publication Date(Web):February 21, 2013
DOI:10.1021/je3012315
Reactive extractions of o-, m-, and p-chlorophenol (o-, m-, and p-CP) from aqueous solutions using tri-n-butyl phosphate (TBP) dissolved in kerosene were studied. The influences of equilibrium aqueous pH (pHeq) and initial TBP concentrations on distribution ratio (D) were discussed. Effective extractions of CP were observed only under pHeq lower than 7.0. D values increased with the increase of initial TBP concentration. TBP mainly reacted with the neutral form of CP by forming 1:1 (TBP:CP) complex through a hydrogen-bond between phosphoryl in TBP and hydroxyl in CP. The apparent reaction extraction equilibrium constant (K) for o-, m-, and p-CP was found in good linear relationship with the addition of dissociation constant (pKa) and the hydrophobic parameter (Log P) of CP, namely, log K = −0.1171 × pKa + 0.0680 × Log P + 2.5848, suggesting pKa plays a much more important role that affects K than Log P. Back-extraction experiments supported > 95 % CP could be recovered using 0.5 mol·L–1 NaOH as stripping agent. The work put forward a potential green process for treatment of CP effluents with great importance.
Co-reporter:Jing Wang, Wei Guo, Shanhu Liu, Deliang Li
Ultrasonics Sonochemistry 2012 Volume 19(Issue 3) pp:464-468
Publication Date(Web):May 2012
DOI:10.1016/j.ultsonch.2011.09.004
CdSe and CdSe/TiO2 nanoparticles were synthesized under multibubble sonoluminescence (MBSL) condition. The influences of TiO2 introduced as the sensitizer on the morphology and crystal transformation were investigated. The morphology, phase and optical properties of the final products have been characterized by X-ray powder diffraction, transmission electron microscope, UV–vis absorption spectroscopy and photoluminescence spectroscopy. The results showed that as-prepared nanoparticles are well-crystallized, and the suppression of crystal pattern transition as well as the control of CdSe crystal growth can be implemented by coupling of TiO2 semiconductor. Furthermore, the possible growth mechanism for different morphologies and crystal phases of the nanocrystals were also discussed.
Co-reporter:Deliang Li, Jing Wang, Xia Li, Hongling Liu
Materials Science in Semiconductor Processing 2012 Volume 15(Issue 2) pp:152-158
Publication Date(Web):April 2012
DOI:10.1016/j.mssp.2011.10.003
Visible-light-induced nano CdS/TiO2 sonophotocatalysts with different morphologies and particle sizes were prepared under multi-bubble sonoluminescence condition with different ultrasonic frequencies. The characterization and property studies were performed by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, UV–vis diffuse reflectance spectroscopy and surface area measurement, etc. In addition, we discussed the mechanical effects of shockwave formed from ultrasound-induced cavitation and investigated the degradation of methyl orange under simultaneous sonolysis and photocatalysis, i.e. sonophotocatalysis, in the presence of the CdS/TiO2 nanoparticles. The results suggest that the compactness, crystallinity and grain size of CdS/TiO2 nanocomposites produced are governed by the applied frequency, which in turn influence the sonophotocatalytic activity.
Co-reporter:Zhixian Chang, Mei Xu, Ling Zhang, and Deliang Li
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 7) pp:2030-2036
Publication Date(Web):June 11, 2012
DOI:10.1021/je300329h
Reactive extractions of o-, m-, and p-aminophenol (OAP, MAP, and PAP) using trialkylphosphine oxide/kerosene (TRPO/kerosene) have been studied. The equilibrium aqueous pH (pHeq) and the concentrations of TRPO in organic phases were found to be of important effects on the distribution coefficient (D) of OAP, MAP, and PAP between TRPO/kerosene and water. Infrared spectra results suggested pHeq had no influence on the complexes' structures, and TRPO mainly reacted with neutral aminophenol through forming a hydrogen bond between its P═O and aminophenol OH. An expression of D was proposed, and the apparent reactive extraction equilibrium constants (K) were calculated by fitting the experimental data. The dissociation constant of the OH group of aminophenol (namely, pKa2) played a vital role that affected K, while the hydrophobic parameter (log P) of aminophenol had little effect. K was statistically calculated to be in accordance with the equation of log K + pKa2 = 10.94 under all experimental test conditions. D values calculated from the model were in good agreement with experimental ones.
Co-reporter:De-Liang Li, Yuan-Yuan Guo, Zhi-Xian Chang, and Xiao-Li Feng
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 10) pp:2817-2822
Publication Date(Web):September 10, 2012
DOI:10.1021/je300703z
Extractions of 8-hydroxyquinoline (8-HQ) by tributylphosphate (TBP) in kerosene, as well as pure TBP and kerosene, were carried out. The investigations involved the equilibrium pH (pHeq) of 3.0 to 11.5, initial 8-HQ concentrations of (0.5 to 5.0) mmol·L–1, and initial TBP concentrations of (0.05 to 1.0) mol·L–1. The distribution ratio (D) was found to be highly dependent on pHeq, and larger D values appeared at pHeq range of 6.3 to 8.4. The distribution constants (KD) for pure TBP and kerosene were calculated to be 236.6 and 26.98, respectively. The experimental KD for TBP/kerosene was expressed by KD,TBP, KD,kerosene, and the volume fractions of TBP or kerosene. The mix of TBP and kerosene was found to be a nonideal process. The deviation of KD from the ideal is proportional to the product of volume fractions of TBP and kerosene. The (1:1) TBP:8-HQ complex was verified by fitting experimental data, and the apparent extraction reaction equilibrium constant was calculated to be 64.58 L·mol–1. The results are of significant importance for the practical separation of 8-HQ from diluents.
Co-reporter:Ling Zhang, Fei Yu, Zhixian Chang, Yuanyuan Guo, and Deliang Li
Journal of Chemical & Engineering Data 2012 Volume 57(Issue 2) pp:577-581
Publication Date(Web):January 24, 2012
DOI:10.1021/je201314m
The extraction equilibrium of picolinic acid using trialkylamine (N235) dissolved in n-octanol at 298 ± 0.5 K has been studied. The factors that affected distribution coefficients (D), such as aqueous equilibrium pH (pHeq), N235 concentration, and diluents, were investigated. As diluents, n-octanol showed higher D values than those of tetrachloromethane and kerosene. The maximum D values appeared at a N235 concentration of 0.4218 mol·L–1, which were in agreement with the results of the apparent alkalinity of N235/n-octanol. The D values were also observed with peak values at pHeq in the range of 4.5–6.0. In addition, D decreased with the increase of the initial picolinic acid concentration. Fourier transform infrared spectrometry confirmed that pHeq had no influence on the complexes’ structure and the extraction reaction belonged to the proton-transfer process. The expression of D was proposed based on the mass action law with reasonable assumptions, and the model parameters were calculated by fitting the experimental data. The D values obtained by the model were in good agreement with the experimental ones.
Co-reporter:Ling Zhang, Xia Li, Zhixian Chang, Deliang Li
Materials Science in Semiconductor Processing 2011 Volume 14(Issue 1) pp:52-57
Publication Date(Web):March 2011
DOI:10.1016/j.mssp.2011.01.004
Hollow N, Co co-doped TiO2/SiO2 microspheres (CNT) have been prepared by in-suit polymerization and chemical adsorption methods, using polystyrene microspheres (PS) as the templates, tetraethylorthosilicate (TEOS) and tetrabutyltitanate (TBOT) as precursors, triethylamine and cobaltous nitrate as N and Co sources, respectively. The resultant CNT was characterized and compared with TiO2/SiO2 (ST), N-doped TiO2/SiO2 (NT) and Co-doped TiO2/SiO2 (CT) which were synthesized by the same method. Characterization was performed by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and diffuse reflectance spectroscopy (DRS). CNT was observed to be of hollow structure, with nanometer size, broad adsorption wavelength even to 600 nm and high photocatalytic activity. XPS analysis showed that a TiON bond was formed, while Co mainly existed in the form of CoOx–MO2 (M=Ti or Si). Co only served to broaden the visible light absorption scope. N and Co cooperated with each other and enhanced the photocatalytic activity.
Co-reporter:Deliang Li, Qing Liu, Laigui Yu, Xiaohong Li, Zhijun Zhang
Applied Surface Science 2009 Volume 255(Issue 18) pp:7871-7877
Publication Date(Web):30 June 2009
DOI:10.1016/j.apsusc.2009.04.121
Abstract
The polyamide-6 pellets were mixed with nano-SiO2 particles surface-capped by 3-aminopropyltriethoxysilane (APS) via a melt blending route. PA-6 composites doped with surface-capped nano-SiO2 (designated as PAMNS, where AMNS refers to APS surface-capped nano-SiO2). AMNS and the silica samples (designated as EAMNS) extracted by acid etching from various PAMNS samples containing different concentration of amino functional groups on surface-capped nano-silica surfaces were characterized by means of Fourier transformation infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA). This aims at revealing the interfacial interaction between AMNS and PA-6 matrix and its effect on the mechanical properties of the filled PA-6 composites. The chemical features and microstructures of the PAMNS composites were analyzed by means of FTIR and transmission electron microscopy (TEM), respectively, while their mechanical properties were evaluated using standardized test rigs. Results demonstrate that the surface-modified nano-SiO2 particles were uniformly dispersed in PA-6 matrix. The residue silica extracted from various PAMNS samples showed characteristic FTIR absorbance peak of PA-6 and had larger weight losses than AMNS, implying that the polymeric matrix was chemically bonded with the nanofiller particles. The interfacial interactions are closely related to the concentration of functional groups in AMNS, and there might exist a critical concentration at which the strongest interfacial interactions could be reached. Beyond the critical concentration of the functional groups in AMNS, the mechanical properties of the filled PA-6 composites tended to decrease to some extent.
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