Spectroscopic investigation of uranyl(VI) and citrate coadsorption to Al2O3

被引：17
|
作者：
Pasilis, Sofie P. [1 ]
Pemberton, Jeanne E. [1 ]
机构：
[1] Univ Arizona, Dept Chem, Tucson, AZ 85721 USA
来源：
GEOCHIMICA ET COSMOCHIMICA ACTA | 2008年 / 72卷 / 02期
基金：
美国国家卫生研究院;
关键词：
D O I：
10.1016/j.gca.2007.09.036
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
ATR-FTIR spectroscopy is used to understand the adsorption of uranyl-citrate complexes to Al2O3- Spectral data indicate that uranyl-citrate complexes partially dissociate upon adsorption, allowing full or partial hydrolysis of the uranyl ion. K-ads values determined for free citrate adsorption are similar to those for citrate in uranyl-citrate complexes, indicating that the complexation of uranyl by citrate does not significantly affect the ability of citrate to bond with the surface. The isotherm data also indicate enhanced citrate adsorption to Al2O3 in the presence of uranyl, suggesting that uranyl may be the central link between two citrate ligands, and that uranyl is associated with the surface through a bridging citrate ligand. Finally, uranyl-citrate complexes interact with citrate adsorbed to Al2O3 through outer sphere interactions. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：277 / 287
页数：11
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