Sorption of antimony (V) onto synthetic goethite in carbonate medium

被引：27

作者：

Martinez-Llado, Xavier ^{[2
]}

de Pablo, Joan ^{[1
,2
]}

Gimenez, Javier ^{[1
]}

Ayora, Carles ^{[3
]}

Marti, Vicenc ^{[2
]}

Rovira, Miquel ^{[2
]}

机构：

[1] Univ Politecn Cataluna, Dept Engn Quim, E-08028 Barcelona, Spain

[2] CTM Ctr Tecnol, Manresa, Spain

[3] Inst Ciencies Terra Jaime Almera, CSIC, Barcelona, Spain

来源：

SOLVENT EXTRACTION AND ION EXCHANGE | 2008年 / 26卷 / 03期

关键词：

antimony; sorption; goethite; surface complexation model;

D O I：

10.1080/07366290802053637

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The sorption kinetics of antimony(V) on synthetic goethite is very fast compared to the sorption of other metals on goethite (e.g. arsenic and selenium) and depends on temperature, with an activation energy of 49 +/- 9 kJ . mol(-1) in the temperature range 15-35 degrees C. Sorption isotherms have been developed at different temperatures and ionic strength values. The results have been modelled using a Langmuir isotherm and there is not a considerable influence of neither the temperature in the range studied (15 degrees C-35 degrees C), nor the ionic strength (between 0.001 and 0.01 mol . dm(-3)). Sorption is very high at pH values lower than 8, at more alkaline pH, the sorption decreases with pH, as expected considering the Antimony(V) predominating complex in solution, Sb(OH)(6)(-). Triple-layer model successfully describes the data obtained by assuming a bidentate edge-shaiing surface complex of antimonate on the surface of goethite.

引用

页码：289 / 300

页数：12

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