TY - JOUR
T1 - Uranium(VI) adsorption on graphene oxide nanosheets from aqueous solutions
AU - Li, Zijie
AU - Chen, Fei
AU - Yuan, Liyong
AU - Liu, Yalan
AU - Zhao, Yuliang
AU - Chai, Zhifang
AU - Shi, Weiqun
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 91026007 ) and the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant Nos. XDA03010401 and XDA03010403 ). The authors express their gratitude to the crew of 1W1B beamline of Beijing Synchrotron Radiation Facility for their constructive assistance in the course of EXAFS measurements and data analysis.
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/11/1
Y1 - 2012/11/1
N2 - Single-layered graphene oxide (GO) prepared by the Hummers method was used to adsorb U(VI) ions from aqueous solutions. The U(VI) sorption was studied as a function of solution pH, ionic strength, and initial concentration of U(VI) using a batch method in air. It is found that the sorption is rapid, strongly dependent on pH, attaining a plateau at pH 4.0-7.5, and independent of the ionic strength. This suggests the formation of inner-sphere surface complexes of U(VI) on GO. The maximum sorption capacity of GO for U(VI) was evaluated to be 299. mg/g at pH 4.0, ranking it among the most effective sorbents reported for U(VI) so far. The abundant oxygen-containing functional groups of GO were demonstrated to play crucial roles in the sorption. Using the distribution coefficients obtained at different temperatures, thermodynamic parameters were also calculated, showing that the sorption is endothermic and spontaneous. GO could be a promising sorbent material applied in the environmental cleanup of uranium pollution and the enrichment of uranium from large volumes of solution.
AB - Single-layered graphene oxide (GO) prepared by the Hummers method was used to adsorb U(VI) ions from aqueous solutions. The U(VI) sorption was studied as a function of solution pH, ionic strength, and initial concentration of U(VI) using a batch method in air. It is found that the sorption is rapid, strongly dependent on pH, attaining a plateau at pH 4.0-7.5, and independent of the ionic strength. This suggests the formation of inner-sphere surface complexes of U(VI) on GO. The maximum sorption capacity of GO for U(VI) was evaluated to be 299. mg/g at pH 4.0, ranking it among the most effective sorbents reported for U(VI) so far. The abundant oxygen-containing functional groups of GO were demonstrated to play crucial roles in the sorption. Using the distribution coefficients obtained at different temperatures, thermodynamic parameters were also calculated, showing that the sorption is endothermic and spontaneous. GO could be a promising sorbent material applied in the environmental cleanup of uranium pollution and the enrichment of uranium from large volumes of solution.
KW - Extended X-ray absorption fine structure (EXAFS)
KW - Graphene oxide (GO)
KW - Nanomaterial
KW - Sorption
KW - UO22+
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U2 - 10.1016/j.cej.2012.09.030
DO - 10.1016/j.cej.2012.09.030
M3 - Article
AN - SCOPUS:84867118567
SN - 1385-8947
VL - 210
SP - 539
EP - 546
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -