Hexavalent chromium removal from aqueous solution by adsorption on treated sawdust

被引：333

作者：

Baral, Saroj S. ^{[1
]}

Das, Surendra N.

Rath, Pradip

机构：

[1] Reg Res Lab, Dept Environm Management & Inorgan Chem, Bhubaneswar 751013, Orissa, India

[2] Natl Inst Technol, Dept Chem Engn, Rourkela 769008, Orissa, India

来源：

BIOCHEMICAL ENGINEERING JOURNAL | 2006年 / 31卷 / 03期

关键词：

adsorption; Cr(VI); treated sawdust; kinetics; isotherm and thermodynamics;

D O I：

10.1016/j.bej.2006.08.003

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The studies on adsorption of hexavalent chromium were conducted by varying various parameters such as contact time, pH, amount of adsorbent, concentration of adsorbate and temperature. The kinetics of adsorption of Cr(VI) ion followed pseudo second order. Langmuir adsorption isotherm was employed in order to evaluate the optimum adsorption capacity of the adsorbent. The adsorption capacity was found to be pH dependant. Sawdust was found to be very effective and reached equilibrium in 3 h (adsorbate concentration 30 mg l(-1)). The rate constant has been calculated at 303, 308, 313 and 318 K and the activation energy (E,) was calculated using the Arrhenius equation. Thermodynamic parameters such as standard Gibbs energy (Delta G degrees) and heat of adsorption (Delta H-r) were calculated. The Delta G degrees and Delta H-r values for Cr(VI) adsorption on the sawdust showed the process to be exothermic in nature. The percentage of adsorption increased with decrease in pH and showed maximum removal of Cr(VI) in the pH range 4.5-6.5 for an initial concentration of 5 mg l(-1). (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：216 / 222

页数：7

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