King P, Anuradha K, Lahari S Beena, Prasanna Kumar Y, Prasad V S R K
Environmental Pollution Control Engineering Laboratory, Department of Chemical Engineering, A.U. College of Engineering, Andhra University, Visakhapatnam 530003, India.
J Hazard Mater. 2008 Mar 21;152(1):324-9. doi: 10.1016/j.jhazmat.2007.06.101. Epub 2007 Jul 3.
The removal of zinc ions from aqueous solutions on the biomass of Azadirachta indica bark has been studied by using batch adsorption technique. The biosorption studies were determined as a function of contact time, pH, initial metal ion concentration, average biosorbent size and biosorbent dosage. The equilibrium metal uptake was increased and percentage biosorption was decreased with an increase in the initial concentration and particle size of biosorbent. The maximum zinc biosorption occurred at pH 6 and percentage biosorption increases with increase in the biosorbent dosage. Experimental data obtained were tested with the adsorption models like Langmuir, Freundlich and Redlich-Peterson isotherms. Biosorption isothermal data were well interpreted by Langmuir model with maximum biosorption capacity of 33.49mg/g of zinc ions on A. indica bark biomass and kinetic data were properly fitted with the pseudo-second-order kinetic model.
采用间歇吸附技术研究了印楝树皮生物质对水溶液中锌离子的去除情况。生物吸附研究是作为接触时间、pH值、初始金属离子浓度、生物吸附剂平均粒径和生物吸附剂用量的函数来进行的。随着生物吸附剂初始浓度和粒径的增加，平衡金属吸附量增加，生物吸附百分比降低。最大锌生物吸附发生在pH值为6时，生物吸附百分比随生物吸附剂用量的增加而增加。用Langmuir、Freundlich和Redlich-Peterson等温线等吸附模型对获得的实验数据进行了测试。Langmuir模型能很好地解释生物吸附等温线数据，印楝树皮生物质对锌离子的最大生物吸附容量为33.49mg/g，动力学数据与伪二级动力学模型拟合良好。
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