Adsorption of cobalt from aqueous solutions onto sepiolite

被引：456

作者：

Kara, M

Yuzer, H

Sabah, E

Celik, MS ^{[1
]}

机构：

[1] Istanbul Tech Univ, Min Engn Dept, Mineral Proc Sect, TR-80626 Istanbul, Turkey

[2] Mat & Chem Technol Res Inst, Tubitak Marmara Res Ctr, TR-41470 Gebze, Turkey

[3] Kocatepe Univ, Mineral Proc Program, TR-03000 Afyon, Turkey

来源：

WATER RESEARCH | 2003年 / 37卷 / 01期

关键词：

adsorption; clay minerals; sepiolite; cobalt; wastewater treatment;

D O I：

10.1016/S0043-1354(02)00265-8

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Adsorption of Co(II) ions from aqueous sepiolite suspensions has been systematically investigated as a function of several variables including activation conditions, solid to liquid ratio, pH and temperature. The results are analyzed to identify the mechanism of cobalt uptake by sepiolite. Both abstraction and real adsorption isotherms were constructed to isolate the precipitation of cobalt from the real adsorption. Also, for the first time a plausible correlation between the released Mg (II) ions from sepiolite matrix and those adsorbed Co (II) ions is made. A one to one ion exchange mechanism is found to describe the results. The data obtained from adsorption isotherms at different temperatures were fitted to various adsorption models to calculate thermodynamic quantities such as the free energy of adsorption, heat of adsorption and entropy of adsorption. The thermodynamic data indicate that Co (11) adsorption onto sepiolite is entropically driven and characterized by physical adsorption. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：224 / 232

页数：9

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