The adsorption kinetics and modeling for heavy metals removal from wastewater by Moringa pods
The adsorption kinetics and modeling for heavy metals removal from wastewater by Moringa pods
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DOI：
10.1016/j.jece.2015.03.027
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发表时间：
2015-06-01
影响因子：
7.7
通讯作者：
Al Syouf, Maha Q.
中科院分区：
文献类型：
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作者：
Matouq, Mohammed;Jildeh, Nina;Al Syouf, Maha Q.
研究了辣木菌种(MAG)对合成废水中铜、镍、铬、锌离子的去除效果。详细讨论了初始金属浓度、吸附时间、吸附温度、吸附剂量等实验参数对吸附效果的影响。用Langmuir、Freundlich、Temkin和Dubinin-Radushkevich等温线模型对吸附平衡数据进行了分析，确定了各金属的最佳关联式。在4个等温线模型中，Freundlich和Temkin模型对铜的平衡等温线进行了拟合，Temkin和Dubinin-Radushkevich模型对镍的关联最好，对铬的等温线模型最好地描述了实验数据。结果表明，每g生物吸附剂对重金属的吸附容量分别为：铜Q(E)=6.07mgCu/g MAG，镍Q(E)=5.53mgNi/g MAG，铬Q(E)=5.497 mg Cr/g MAG，对每种离子的脱色率分别为90%、68%和91%。结果还表明，MAG豆荚不是去除废水中锌的良好生物吸附剂。所有金属的动力学结果均符合准二级模型。(C)2015爱思唯尔有限公司。保留所有权利。
The investigation of the effectiveness of the removal of copper, nickel, chromium and zinc ions from synthetic waste water by using Moringa aptera Gaertn (MAG) was studied. The effect of biosorption experimental parameters such as initial metal concentration, contact time, temperature and adsorbent dose has been presented and discussed in details. The equilibrium data for biosorption were analysed by using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models to define the best correlation for each metal.Among the four isotherm models, both Freundlich and Temkin models were fitted with the equilibrium isotherm for copper, while Temkin and Dubinin-Radushkevich models best correlated for nickel and Langmuir isotherm model best describe the experimental data for chromium. The adsorption capacity for each studied heavy metals is reported as follows: copper q(e) = 6.07 mg Cu/g MAG, nickel q(e) = 5.53 mg Ni/g MAG and chromium q(e) = 5.497 mg Cr/g MAG with a removal percentage of 90%, 68% and 91%, respectively for each ion at 1 g dose of biosorbent. Results also show that MAG pods are not a good biosorbent for the removal of zinc from wastewater. Kinetics results were best described by pseudo-second order model for all metals. (C) 2015 Elsevier Ltd. All rights reserved.