Journal
CHEMOSPHERE
Volume 90, Issue 2, Pages 548-555Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.08.027
Keywords
Sepiolite; Mercapto; Functionalization; Sorption; Lead
Categories
Funding
- National Natural Science Foundation of China [21177068, 40901154, 21107056]
- Program for Distinguishing Scholar and Innovative Team of MOA [2012-jcrc-xym]
- Special Fund for Agro-Scientific Research in the Public Interest of China [201203045]
- Natural Science Foundation of Tianjin [10JCYBJC06300]
- Central Public Research Institutes Basic Funds for Research and Development (Agro-Environmental Protection Institute, Ministry of Agriculture)
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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.
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