Optimization parameters for adsorption and desorption of Zn(II) and Se(IV) using rice husk ash: kinetics and equilibrium

被引：0
|
作者：
Asrar G. El-Said
Nagwa A. Badawy
Attyat Y. Abdel-Aal
Salwa E. Garamon
机构：
[1] Al-Azhar University (Girls),Faculty of Science, Chemistry Department
来源：
Ionics | 2011年 / 17卷
关键词：
Rice husk ash; Adsorption isotherm; Metal ions; Kinetic and desorption;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
An attempt at the use of rice husk ash, an agricultural waste, as an adsorbent of Zn(II) and Se(IV) from their aqueous solution is studied. Studies are carried out as a function of contact time, metal ion concentration, adsorbent dose, and pH at 25 °C. Its adsorption capability and adsorption rate are considerably higher and faster for Zn(II) ions than for Se(IV) ions. Zn(II) adsorption was found fast reaching equilibrium within ≃1 h while Se(IV) adsorption was slow reaching equilibrium within ≃100 h. The Bangham equation can be used to express the mechanism for adsorption. The experimental isotherm data were analyzed using Langmiur, Freundlich, and Temkin models. Desorption experiments were carried out using different media with a view to regenerate the spent adsorbent and to recover the adsorbed metal ion.
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页码：263 / 270
页数：7
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