ADSORPTION OF SELENIUM ON HYDROUS ALUMINA

被引：33

作者：

GHOSH, MM

COX, CD

YUANPAN, JR

机构：

[1] Department of Civil Engineering, University of Tennessee, Knoxville, Tennessee

[2] University of Missouri, Columbia, Missouri

来源：

ENVIRONMENTAL PROGRESS | 1994年 / 13卷 / 02期

关键词：

D O I：

10.1002/ep.670130210

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Adsorption of selenite (SeO32-) and selenate (SeO42-) on hydrous alumina (gamma-Al2O3) was studied using batch equilibrium experiments. pH, the single most significant parameter, affected both speciations of selenium (Se) and of surface hydroxo groups on alumina that, in turn, determined the extent of adsorption of the oxyanions. Adsorption of both anions could be described satisfactorily by the Triple Layer Model (TLM). In the presence of SO42-, Se (VI) adsorption decreased significantly. Fixed bed adsorbers of alumina with an empty bed contact time (EBCT) of 2 minutes or longer provided excellent removal of Se(IV) from dilute aqueous solutions in the pH range of 5 to 8 for a long period. Spent alumina beds were successfully regenerated with 0.25 percent NaOH solution followed by rinsing with deionized water and 0.05 M HCl. While two percent of alumina was lost per cycle on an average, the loss in adsorption capacity of regenerated alumina was insignificant.

引用

页码：79 / 88

页数：10

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