Removal of Cr(VI) and Hg(II) from aqueous solutions using fly ash and impregnated fly ash

被引：87

作者：

Banerjee, SS

Joshi, MV

Jayaram, RV ^{[1
]}

机构：

[1] Univ Mumbai, Inst Chem Technol, Div Appl Chem, Bombay 400019, Maharashtra, India

[2] ICI India Res & Technol Ctr, Thana, India

来源：

SEPARATION SCIENCE AND TECHNOLOGY | 2004年 / 39卷 / 07期

关键词：

Langmuir adsorption model; first-order kinetic model; thermodynamic parameters;

D O I：

10.1081/SS-120030778

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The potential of impregnated fly ash (IFA), as low-cost adsorbent, was evaluated for the removal of Cr(VI) and Hg(II) from aqueous solutions by using batch equilibration technique. Effect of various physicochemical parameters such as initial concentration, contact time, temperature, and pH on the adsorption was investigated in order to optimize the conditions for adsorption. IFA showed enhanced tendency for adsorption. Adsorption efficiency was found to be dependent on the initial concentration and the adsorption behavior followed the Langmuir adsorption model. The adsorption capacity (Q(0)) of FA, IFAA1, and IFAFe for Cr(VI) was found to be 1.379, 1.820, and 1.667 mg g(-1) and that of Hg(II) was 11.00, 12.50, and 13.40 mg g(-1). Rate constants were evaluated in terms of a first-order kinetic model. Thermodynamic parameters such as free energy (DeltaGdegrees), enthalpy (DeltaHdegrees), and entropy (DeltaSdegrees) for the adsorption process were calculated. The adsorption was found to be endothermic in both the cases.

引用

页码：1611 / 1629

页数：19

共 33 条

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