Document Detail


Adsorption of mercury on lignin: Combined surface complexation modeling and X-ray absorption spectroscopy studies.
MedLine Citation:
PMID:  22243872     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Adsorption of mercury (Hg) on lignin was studied at a range of pH values using a combination of batch adsorption experiments, a surface complexation model (SCM) and synchrotron X-ray absorption spectroscopy (XAS). Surface complexation modeling indicates that three types of acid sites on lignin surfaces, namely aliphatic carboxylic-, aromatic carboxylic- and phenolic-type surface groups, contributed to Hg(II) adsorption. The bond distance and coordination number of Hg(II) adsorption samples at pH 3.0, 4.0 and 5.5 were obtained from extended X-ray absorption fine structure (EXAFS) spectroscopy analysis. The results of SCM and XAS combined reveal that the predominant adsorption species of Hg(II) on lignin changes from HgCl(2)(0) to monodentate complex -C-O-HgCl and then bidentate complex -C-O-Hg-O-C- with increasing pH value from 2.0 to 6.0. The good agreement between SCM and XAS results provides new insight into understanding the mechanisms of Hg(II) adsorption on lignin.
Authors:
Jitao Lv; Lei Luo; Jing Zhang; Peter Christie; Shuzhen Zhang
Publication Detail:
Type:  Journal Article     Date:  2011-12-17
Journal Detail:
Title:  Environmental pollution (Barking, Essex : 1987)     Volume:  162     ISSN:  1873-6424     ISO Abbreviation:  Environ. Pollut.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-01-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804476     Medline TA:  Environ Pollut     Country:  England    
Other Details:
Languages:  eng     Pagination:  255-61     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Affiliation:
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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