文献类型：期刊文献

英文题名：Preparation, characterization, and highly effective mercury adsorption of L-cysteine-functionalized mesoporous silica

作者：Li, Qing[1,2,3];Wang, Zheng[1];Fang, Dong-Mei[1,2,3];Qu, Hai-yun[1];Zhu, Yan[1];Zou, Hui-jun[1];Chen, Yi-rui[1];Du, Yi-Ping[2,3];Hu, Hui-lian[2,3]

机构：[1]Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2014

卷号：38

期号：1

起止页码：248

外文期刊名：NEW JOURNAL OF CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000329886900032)】；

基金：This project was supported by National Natural Science Foundation of China (No. 21175145), the Science and Technology Commission of Shanghai Municipality (No. 09142201800) and (No. 13142201200).

语种：英文

摘要：A novel L-cysteine-functionalized mesoporous SBA-15 (SH-SBA-15) material was synthesized by an easy two-step post-grafting method of L-cysteine using poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) as a template under acidic conditions. The material maintained its well-ordered mesostructure after two-step modification as confirmed by powder X-ray diffraction and transmission electron microscopy analyses. X-ray photoelectron spectroscopy and C-13 cross-polarization/magic angle spinning NMR revealed that L-cysteine was successfully introduced into SBA-15. The material showed excellent mercury adsorption capacity (429 mg g(-1)) at room temperature and mercury uptake time (<5 min). Adsorption isotherms and uptake kinetics were also investigated. Equilibrium data were found to be represented better by the Freundlich isotherm model than the Langmuir one. The pseudo-second-order kinetics model best described the kinetic adsorption process of Hg(II) ions onto SH-SBA-15. Moreover, the material possessed high selectivity for mercury and can be easily eluted with 5% thiourea in 1 mol L-1 aqueous HCl.