Insights into sorption species of Eu(III) on gamma-Al2O3 and bentonite   under different pH: Studies at macro- and micro-scales

doi:10.1007/s10967-013-2819-x

CORC > 北京大学 > 化学与分子工程学院

	Insights into sorption species of Eu(III) on gamma-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales
	Fan, Qiaohui ; Li, Ping ; Zheng, Zhong ; Wu, Wangsuo ; Liu, Chunli
刊名	journal of radioanalytical and nuclear chemistry
	2014
关键词	Sorption gamma-Al2O3 Bentonite XAS Surface complexation model Eu(III) IONIC-STRENGTH HUMIC-ACID FULVIC-ACID EUROPIUM RETENTION GAMMA-ALUMINA CONTACT TIME EXAFS BATCH COMPLEXATION SPECTROSCOPY
DOI	10.1007/s10967-013-2819-x
英文摘要	The sorption species of Eu(III) on gamma-Al2O3 and bentonite was investigated by batch, surface complexation model (SCM), and X-ray absorption spectroscopy (XAS). The results showed that sorption edges of Eu(III) on gamma-Al2O3 and bentonite were as expected shifted forward high pH with the increasing in Eu(III) concentration, and sorption of Eu(III) was strongly dependent on pH. In gamma-Al2O3 system, sorption of Eu(III) was decreased above pH 8.5 at low concentration of Eu(III) because of water soluble carbonate species of Eu(III), however the decline did not appear at high concentration of Eu(III) possibly due to a offset effect of surface precipitation. Actually, the sorption species of Eu(III) on bentonite mainly referred to at least four kinds of species including ion exchange (>X3Eu0) at low pH, inner-sphere complexes (>AlOEu2+ and >SiOEu2+) at neutral condition, and hydrolysis species (>SiOEu(OH)(2)(0)) at alkaline condition. Linear combination fitting (LCF) in k space testified that hydrolysis of Eu(OH)(3)(s) and oxide of Eu2O3 species were major for Eu(III) sorption on gamma-Al2O3, whereas Eu3+(aq) and hydrolysis species comprised sorption species on bentonite. Extended X-ray absorption fine structure (EXAFS) analysis further confirmed the prediction from SCM and LCF. In addition, the typical shells of Eu-Al in R range of 3.0-3.4 angstrom and Eu-Si at similar to 4.0 angstrom were found in radial structure functions, which was possibly identified to edge-shared bidentate of Eu(III) on Al2O3 and bentonite.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000332034400078&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; SCI(E); 6; ARTICLE; liucl@pku.edu.cn; 3; 1767-1775; 299
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/150568]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Fan, Qiaohui,Li, Ping,Zheng, Zhong,et al. Insights into sorption species of Eu(III) on gamma-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales[J]. journal of radioanalytical and nuclear chemistry,2014.
APA	Fan, Qiaohui,Li, Ping,Zheng, Zhong,Wu, Wangsuo,&Liu, Chunli.(2014).Insights into sorption species of Eu(III) on gamma-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales.journal of radioanalytical and nuclear chemistry.
MLA	Fan, Qiaohui,et al."Insights into sorption species of Eu(III) on gamma-Al2O3 and bentonite under different pH: Studies at macro- and micro-scales".journal of radioanalytical and nuclear chemistry (2014).