Equilibrium and kinetic studies of adsorption of phosphate onto ZnCl2 activated coir pith carbon

被引：235
|
作者：
Namasivayam, C [1 ]
Sangeetha, D [1 ]
机构：
[1] Bharathiar Univ, Environm Chem Div, Dept Environm Sci, Coimbatore 641046, Tamil Nadu, India
来源：
JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2004年 / 280卷 / 02期
关键词：
adsorption; ZnCl2-activated coir pith carbon; phosphate; isotherms; pH effect; desorption; temperature effect;
D O I：
10.1016/j.jcis.2004.08.015
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Phosphate removal from aqueous solution was investigated using ZnCl2-activated carbon developed from coir pith, an a agricultural Solid waste. Studies were conducted to delineate the effect of contact time, adsorbent dose, phosphate concentration, pH, and temperature. The adsorption equilibrium data followed both Langmuir and Freundlich isotherms. Langmuir adsorption capacity was found to be 5.1 mg/g. Adsorption followed sccond-order kinetics. The removal was maximum in the pH range 3-10. pH effect and desorption studies showed that adsorption occurred by both ion exchange and chemisorption mechanisms. Adsorption Was found to be spontaneous and endothermic. Effect of foreign ions on adsorption shows that perchlorate, Sulfate, and selenite decreased the percent removal of phosphate. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码：359 / 365
页数：7
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