Sorption of Pb2+ on mercapto functionalized sepiolite

被引：82

作者：

Liang, Xuefeng

Xu, Yingming

Wang, Lin

Sun, Yuebing

Lin, Dasong

Sun, Yang

Qin, Xu

Wan, Qian

机构：

[1] Minist Agr, Key Lab Original Environm Qual MOA, Agroenvironm Protect Inst, Tianjin 300191, Peoples R China

[2] Tianjin Key Lab Agroenvironm & Agroprod Safety, Tianjin 300191, Peoples R China

来源：

CHEMOSPHERE | 2013年 / 90卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Sepiolite; Mercapto; Functionalization; Sorption; Lead; HEAVY-METAL IONS; SOLID-STATE NMR; ADSORPTION PROPERTIES; SURFACE-AREA; CADMIUM IONS; WASTE-WATER; THIOL; ADSORBENTS; KINETICS; REMOVAL;

D O I：

10.1016/j.chemosphere.2012.08.027

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Mercapto functionalized sepiolite (MSEP) was prepared by nanotexturization method and applied for the sorption of Pb2+ from aqueous solution. These samples before and after sorption were characterized through XRD, FT-IR, Si-29 and C-13 CP/MAS NMR and XPS. The sorption behaviors including thermodynamic and kinetic parameters, effect factors and mechanisms of Pb2+ sorption on MSEP were studied. The maximum sorption amounts of 97 mg g(-1) The parameters Delta H-0 and Delta S-0 were 33.637 kJ mol(-1) and 202.697 J mol(-1) K-1, respectively. Freundlich isotherm was proved to describe the sorption data better than other isotherms and pseudo second order kinetic model could fit the sorption kinetic processes well. The pH influenced the sorption of Pb2+ on MSEP significantly but background electrolytes have relative weak effect. Based on hard and soft acids and bases theory and the results analyzed from XPS, the sorption mechanisms could be explained as primarily chemical adsorption and secondary physical adsorption. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：548 / 555

页数：8

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