Removal of molybdate from water by adsorption onto ZnCl2 activated coir pith carbon

被引：101

作者：

Namasivayam, C ^{[1
]}

Sangeetha, D ^{[1
]}

机构：

[1] Bharathiar Univ, Dept Environm Sci, Environm Chem Div, Coimbatore 641046, Tamil Nadu, India

来源：

BIORESOURCE TECHNOLOGY | 2006年 / 97卷 / 10期

关键词：

adsorption; ZnCl2; activated coir pith carbon; molybdate; isotherms; pH effect; desorption; temperature effect;

D O I：

10.1016/j.biortech.2005.05.008

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

Removal and recovery of molybdate from aqueous solution was investigated using ZnCl2, activated carbon developed from coir pith. Studies were conducted to delineate the effects of contact time, adsorbent dose, molybdate concentration, pH and temperature. Two theoretical adsorption isotherms, namely, Langmuir and Freundlich were used to describe the experimental results. The Langmuir adsorption capacity (Q(0)) was found to be 18.9 mg molybdate/g of the adsorbent. Adsorption followed second order kinetics. Studies were performed at different pH values to find out the pH at which maximum adsorption occurred. The pH effect and desorption studies showed that ion exchange and chemisorption mechanism were involved in the adsorption process. Thermodynamic parameters such as Delta G(0), Delta H-0 and Delta S-0 for the adsorption were evaluated. Effect of foreign ions on adsorption of molybdate has been examined. The results showed that ZnCl2 activated coir pith carbon was effective for the removal and recovery of molybdate from water. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：1194 / 1200

页数：7

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