Sorption of Cr(VI) onto natural iron and aluminum (oxy)hydroxides: Effects of pH, ionic strength and initial concentration

被引：224

作者：

Ajouyed, Omar ^{[1
,2
]}

Hurel, Charlotte ^{[1
]}

Ammari, Mohammed ^{[2
]}

Ben Allal, Laila ^{[2
]}

Marmier, Nicolas ^{[1
]}

机构：

[1] Univ Nice Sophia Antipolis, Fac Sci, Dept Chim, LRSAE, F-06108 Nice 02, France

[2] Univ Abdelmalek Essaadi, Fac Sci & Tech, Dept Chim, LGCVR, Tetouan, Morocco

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 174卷 / 1-3期

关键词：

Adsorption; Chromium; Sediment; Oxy-hydroxides; Adsorption isotherm; AQUEOUS-SOLUTIONS; ADSORPTION; REMOVAL; CHROMIUM(VI); WASTEWATERS; CHROMATE; REDOX; WATER; TRANSFORMATIONS; GOETHITE;

D O I：

10.1016/j.jhazmat.2009.09.096

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this work is to study the performances of removal of hexavalent chromium from aqueous solution by three different oxy-hydroxides: hematite, goethite and alpha-alumina. Batch experiments were conducted to measure the effects on adsorption of Cr(VI) of different parameters such as pH of the medium, ionic strength, and initial concentration. Results showed that the adsorption of Cr(VI) depends strongly on the pH, but is independent of ionic strength for hematite and goethite. For a-alumina, adsorption is strongly dependent on pH values and ionic strength. Equilibrium studies showed that Cr(VI) had a high affinity in an acidic medium, but decreased as solution pH increased. Equilibrium isotherms were measured experimentally. Results were analyzed by the Langmuir and Freundlich equations using linearized correlation coefficient at room temperature. The characteristic parameters for each isotherm have been determined. Langmuir equation was found to fit the equilibrium data for Cr(VI) adsorption. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：616 / 622

页数：7

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