REMOVAL OF PARAQUAT BY ADSORPTION ON WASTE FE(III)/CR(III) HYDROXIDE - ADSORPTION RATES AND EQUILIBRIUM STUDIES

被引：25
作者：
NAMASIVAYAM, C
THAMARAISELVI, K
YAMUNA, RT
机构：
[1] Environmental Chemistry Division, Department of Environmental Sciences, Bharathiar University, Coimbatore, Tamil Nadu
来源：
PESTICIDE SCIENCE | 1994年 / 41卷 / 01期
关键词：
D O I：
10.1002/ps.2780410103
中图分类号：
S3 [农学（农艺学）];
学科分类号：
0901 ;
摘要：
The ability of 'waste' Fe(III)/Cr(III) hydroxide to adsorb paraquat has been investigated. Effects of contact time, initial concentration and pH, adsorption capacity and desorption have been studied. Adsorption followed a first-order expression. The adsorption rate constant decreased from 1.84 to 0.50 min-1 with the increase of paraquat concentration from 10 to 40 mg litre-1. Adsorption obeyed the Freundlich isotherm and the K(f) value was found to be 0.1995. A maximum removal of 93% was attained at pH 12.04. Desorption with water occurred to the extent of 39% indicating that physical sorption was partly responsible in the adsorption process.
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页码：7 / 12
页数：6
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