Document Detail


Facile and highly efficient removal of trace Gd(III) by adsorption of colloidal graphene oxide suspensions sealed in dialysis bag.
MedLine Citation:
PMID:  25108829     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A facile, highly efficient and second-pollution-free strategy to remove trace Gd(III) from aqueous solutions by adsorption of colloidal graphene oxide (GO) suspensions in dialysis bag has been developed. The effects of pH, ionic strength and temperature on Gd(III) adsorption, and the pH-dependent desorption were investigated. The maximum adsorption capacity of Gd(III)on GO at pH=5.9±0.1 and T=303K was 286.86mgg(-1), higher than any other currently reported. The Gd(III)-saturated GO suspension could resume colloidal state in 0.1M HNO3 with desorption rate of 85.00% in the fifth adsorption-desorption cycle. Gd(III) adsorption rate on GO was dependent more on pH and ionic strength than on temperature. The abundant oxygen-containing functional groups such as carboxyl and hydroxyl played a vital role on adsorption. The thermodynamics and kinetics investigations revealed that the adsorption of Gd(III) on GO was an endothermic, spontaneous and monolayer absorption process, which well fitted the pseudo-second-order model. GO could be a promising adsorbent applied in the enrichment and removal of lanthanides from aqueous solutions. More significantly, the combination of colloidal GO suspension with dialysis membrane facilely solves the re-pollution of the treated solutions due to the great difficulties in separation and recovery of GO.
Authors:
Weifan Chen; Linlin Wang; Mingpeng Zhuo; Yue Liu; Yiping Wang; Yongxiu Li
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-7-17
Journal Detail:
Title:  Journal of hazardous materials     Volume:  279C     ISSN:  1873-3336     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2014 Jul 
Date Detail:
Created Date:  2014-8-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  -    
Other Details:
Languages:  ENG     Pagination:  546-553     Citation Subset:  -    
Copyright Information:
Copyright © 2014. Published by Elsevier B.V.
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