Competitive adsorption of molybdate, chromate, sulfate, selenate, and selenite on γ-Al2O3

被引：124
|
作者：
Wu, CH [1 ]
Lo, SL [1 ]
Lin, CF [1 ]
机构：
[1] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 106, Taiwan
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 166卷 / 1-3期
关键词：
competitive adsorption; molybdate; chromate; sulfate; selenate; selenite; TLM;
D O I：
10.1016/S0927-7757(99)00404-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Competitive adsorption of molybdate, selenite, selenate, chromate, and sulfate onto gamma-Al2O3 was investigated in the present study. Binary-solute systems of MoO42-/SeO32-, CrO42-/SO32-, and CrO42-/SeO42- as well as single anion systems were evaluated for the relative influence on competitive adsorption on oxide surface. As would be expected, the adsorption density of each anion in the binary-solute systems decreases, as compared to the respective density in a single anion system. Furthermore, MoO42- inhibits SeO32- adsorption in acidic condition and that SO42- or SeO42- depresses CrO42-. The order of the relative retainment of anions on oxide surface is molybdate > selenite > selenate sulfate > chromate, which corresponds to the magnitude of the overall proton coefficient of the corresponding anions. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：251 / 259
页数：9
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