Sorptive removal of trivalent and hexavalent chromium from binary aqueous solutions by composite alginate-goethite beads

被引：132

作者：

Lazaridis, NK ^{[1
]}

Charalambous, C ^{[1
]}

机构：

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

来源：

WATER RESEARCH | 2005年 / 39卷 / 18期

关键词：

isotherms; kinetics; homogeneous kinetic model; shrinking core model;

D O I：

10.1016/j.watres.2005.09.013

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, the removal of hexavalent and trivalent chromium ions from binary aqueous solutions by composite alginate-goethite beads was investigated in a batch mode. Equilibrium sorption experiments were carried out at different temperatures and pH values. The data were correlated with Langmuir and Freundlich equations. The thermodynamic parameters calculated were: change in free energy, in enthalpy, in entropy and the heat of adsorption. The influence of mixing rate, sorbent concentration and sorbent particle size was studied at kinetic runs. The effective diffusion coefficients were evaluated by employing the homogeneous diffusion model and the shrinking core model for hexavalent and trivalent chromium, respectively. Desorption experiments were conducted by employing various eluants showed that the loaded material could be regenerated satisfactorily. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：4385 / 4396

页数：12

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