Mechanistic modeling of chromate adsorption onto goethite

被引：48
|
作者：
Weerasooriya, R [1 ]
Tobschall, HJ
机构：
[1] Univ Erlangen Nurnberg, Inst Geol & Mineral, Lehrstuhl Angew Geol, D-91054 Erlangen, Germany
[2] Inst Fundamental Studies, Chem Modeling Lab, Kandy, Sri Lanka
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2000年 / 162卷 / 1-3期
关键词：
chromate; goethite; three-plane model; inner-sphere complex; outer-sphere complex;
D O I：
10.1016/S0927-7757(99)00229-0
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：
We have investigated the adsorption of CrO42- onto goethite as a function of pH, background electrolyte and adsorbate loading. Experimental data were interpreted with a three-plane model (TPM) that accounts for spatial charge distribution of inner-sphere surface complexes. In accordance with EXAF spectroscopic data [S. Fendorf, M.J. Eick, P. Grossl, D.L. Sparks, Environ. Sci. Technol. 31 (1997) 315], > (FeOCrO3-1.3)-Cr-0.2 and (> FeO)(2)(CrO2-0.6)-Cr-0.4 surface species were selected for TPM calculations. TPM simulations replicate CrO42- adsorption data well when CrO42- coverage was <2 x 10(-7) mol m(-2). (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：167 / 175
页数：9
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