Kinetics and isotherm studies for the adsorption of phenol using low cost micro porous ZnCl2 activated coir pith carbonA paper submitted to the Journal of Environmental Engineering and Science.
Kinetics and isotherm studies for the adsorption of phenol using low cost micro porous ZnCl2 activated coir pith carbonA paper submitted to the Journal of Environmental Engineering and Science.
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DOI：
10.1139/s08-039
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发表时间：
2009
影响因子：
1.4
通讯作者：
R. Subha;C. Namasivayam
中科院分区：
文献类型：
--
作者：
R. Subha;C. Namasivayam
本文研究了氯化锌活化的Coir髓碳对水溶液中苯酚的吸附性能。采用间歇动力学和等温线研究了接触时间、初始浓度、吸附剂投加量、pH和温度对吸附效果的影响。吸附动力学符合一级、二级吸附模型，求出了吸附动力学模型的速率常数。用Langmuir、Freundlich、Dubinin-Radushkevich和Temkin等温吸附模型分析了苯酚的吸附等温线。吸附容量Q_0为92.58 mg·g~(-1)。PH效应表明，物理吸附可能参与了吸附过程。热力学研究表明，活性碳对苯酚的吸附是一个吸热过程。ΔG0为负值表明吸附过程是自发的。对合成废水中苯酚的去除也进行了试验。本研究表明，氯化锌具有较强的抗氧化性。
In the present study, the potential of ZnCl2 activated coir pith carbon for adsorption of phenol from aqueous solution was investigated. Batch kinetics and isotherm studies were carried out to evaluate the effects of contact time, initial concentration, adsorbent dose, pH, and temperature. Adsorption kinetics was tested for first order, second order, and Bangham’s model and rate constants of kinetic models were evaluated. Equilibrium isotherms for the adsorption of phenol were analysed by Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. The Langmuir adsorption capacity, Q0, was found to be 92.58 mg g–1 of the adsorbent. pH effect showed that physical adsorption might be involved in the adsorption process. Thermodynamic studies revealed that the adsorption of phenol by activated carbon was an endothermic process. The negative value of ΔG0 indicated the spontaneity of the adsorption process. Removal of phenol from synthetic wastewater was also tested. This study showed that ZnCl2 acti...