Kinetics of sorptive removal of chromium(VI) from aqueous solutions by calcined Mg-Al-CO3 hydrotalcite

被引：357

作者：

Lazaridis, NK ^{[1
]}

Asouhidou, DD ^{[1
]}

机构：

[1] Aristotle Univ Thessaloniki, Div Chem Technol, Sch Chem, GR-54124 Thessaloniki, Greece

来源：

WATER RESEARCH | 2003年 / 37卷 / 12期

关键词：

adsorption; chromium(VI); hydrotalcite; kinetics; Freundlich isotherm;

D O I：

10.1016/S0043-1354(03)00119-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The sorptive removal of hexavalent chromium from aqueous solutions by calcined Mg-Al-CO3 hydrotalcite was investigated in a batch mode. The influence of agitation speed, solution pH, initial chromium concentration, sorbent concentration and temperature has been tested in kinetic runs. Three kinetic models have been evaluated to fit the experimental data: the pseudo-first order, the modified-second order and the Elovich equation. It was shown that the first-order model could best describe the sorption kinetics. A Freundlich isotherm was used to fit equilibrium experiments. Hydrotalcite presents a sorption capacity of approximately 120mg Cr/g, under the investigated experimental conditions. The calculated activation energy for process studied was around 40 kJ/mol. (C) 2003 Elsevier Science Ltd. All rights reserved.

引用

页码：2875 / 2882

页数：8

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