Effect of silicate on U(VI) sorption to gamma-Al2O3: Batch and EXAFS studies
Effect of silicate on U(VI) sorption to gamma-Al2O3: Batch and EXAFS studies
复制标题
硅酸盐对 γ-Al2O3 吸附 U(VI) 的影响：批量和 EXAFS 研究
DOI：
10.1016/j.cej.2015.01.121
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发表时间：
2015
影响因子：
15.1
通讯作者：
Wang Xiangke
中科院分区：
文献类型：
--
作者：
Mei Huiyang;Tan Xiaoli;Yu Shujun;Ren Xuemei;Chen Changlun;Wang Xiangke
The effect of soluble silicate on the sorption of U(VI) toγ-Al2O3was investigated by batch experiments and extended X-ray absorption fine structure (EXAFS) method. The presence of silicate enhanced the sorption of U(VI) onγ-Al2O3surface and the sorption was attributed to inner-sphere surface complexation. The structure of the adsorbed U(VI) and silicate onγ-Al2O3was investigated in the analysis of EXAFS spectra. The fitting of the experimental EXAFS data was obtained by including two uranium coordination shells with 2 axial (Oax) and 5 equatorial (Oeq) oxygen atoms at 1.79 ± 0.02 and 2.43 ± 0.02 Å, respectively, and the third coordination shells with Al atom at ∼3.35 Å. Silicate contributed to the formation of ternary inner-sphere surface complexes, acting as “bridge” between U(VI) andγ-Al2O3and enhanced the sorption of U(VI). The observations suggested that the interactions between U(VI) and silicate were important in controlling U(VI) retention.
