Effects of solid-to-solution ratio on uranium(VI) adsorption and its implications

被引:36
作者
Cheng, Tao
Barnett, Mark O.
Roden, Eric E.
Zhuang, Jinling
机构
[1] Auburn Univ, Dept Civil Engn, Auburn, AL 36849 USA
[2] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA
关键词
D O I
10.1021/es051771b
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
U(VI) adsorption onto goethite-coated sand was studied in batch experiments at a solid-to-solution ratio (SSR) ranging from 33.3 to 333 g/L. Batch kinetic experiments revealed that the presence of 10(-4) M phosphate increased both the initial rate and ultimate extent of U(VI) adsorption compared with phosphate-free systems. Our experimental U(VI) adsorption isotherms were independent of SSR in phosphatefree systems. However, the U(VI) adsorption isotherm became dependent on SSR in phosphate-containing systems (with a lower SSR resulting in stronger U(VI) adsorption). A surface complexation model (SCM) was used to conceptualize the interactions in systems containing U(VI), phosphate, and goethite contributing to this SSR effect. The SCM accounted for the effects of SSR on U(VI) adsorption reasonably well. This study implies that the extrapolation of batch-measured adsorption parameters of U(VI) (and potentially other radionuclides and metal(loid)s as well) to field conditions should be done with caution, especially in the presence of strongly interacting ligands.
引用
收藏
页码:3243 / 3247
页数:5
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