Competition between selenium (IV) and silicic acid on the hematite surface

被引:47
作者
Jordan, Norbert [1 ,2 ]
Marmier, Nicolas [1 ]
Lomenech, Claire [1 ]
Giffaut, Eric [2 ]
Ehrhardt, Jean-Jacques [3 ]
机构
[1] Univ Nice Sophia Antipolis, Lab Radiochim Sci Analyt & Environm, F-06108 Nice 2, France
[2] Agence Natl Gest Dechets RAdioactifs, F-92298 Chatenay Malabry, France
[3] Nancy Univ, Lab Chim Phys & Microbiol Environm, CNRS, UMR 7564, F-54600 Villers Les Nancy, France
关键词
Selenium (IV); Silicic acid; Sorption; Competition; Hematite; Surface complexation model; X-RAY-ABSORPTION; IRON-OXIDES; FERRIC-OXIDE; ALPHA-FEOOH; ADSORPTION; SORPTION; GOETHITE; SELENATE; FERRIHYDRITE; INTERFACE;
D O I
10.1016/j.chemosphere.2008.11.018
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Competition between selenium (IV) and silicic acid for the hematite (alpha-Fe(2)O(3)) surface has been studied during this work. Single batch experiments have been performed to study separately the sorption of selenium (IV) and silicic acid as a function of the pH. With the help of the 2-pK surface complexation model, experimental data have been fitted using the FITEQL 4.0 program. Two monodentate inner-sphere surface complexes have been used to fit selenite ions retention. FeSeO(3)(-) and = FeHSeO(3)(-) In order to fit sorption of silicic acid, the two following surface complexes, namely = FeH(3)SiO(4), and FeH(2)SiO(4)(-), have been used. Using the surface complexation constants coming from these two binary systems, prediction curves of the effect of silicic acid on the retention of selenium (IV) onto hematite have been obtained. Finally, performed experiments showed a competition between selenium (IV) and silicic acid for the surface sites of hematite. Experimental data matched DDLM predictions, confirming the ability of the surface complexation model to predict quantitatively and qualitatively the ternary system selenium (IV)/H(4)siO(4)/hematite. (C) 2008 Elsevier Ltd. All rights reserved
引用
收藏
页码:129 / 134
页数:6
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