Equilibrium and kinetic data, and adsorption mechanism for adsorption of lead onto valonia tannin resin
Equilibrium and kinetic data, and adsorption mechanism for adsorption of lead onto valonia tannin resin
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DOI：
10.1016/j.cej.2007.12.005
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发表时间：
2008-09-15
影响因子：
15.1
通讯作者：
Tuerkmenler, Harun
中科院分区：
文献类型：
--
作者：
Oezacar, Mahmut;Sengil, I. Ayhan;Tuerkmenler, Harun
用间歇吸附器研究了铅在缬草单宁树脂上的吸附。本研究的目的是了解控制铅去除的机制，并找到一个合适的平衡等温线和动力学模型在间歇式反应器中去除铅。采用Langmuir， Freundlich， Temkin和Dubinin-Radushkevich方程对实验等温线数据进行了分析。平衡数据与Langmuir等温线拟合较好。采用拟一、二阶方程、Elovich方程和颗粒内扩散方程等4种吸附动力学模型对实验数据进行了分析，确定了铅离子在valonia tannin树脂上吸附的最佳方程。确定了各动力学模型的特征参数，并计算了相关系数，以评价哪一种模型的预测数据与实验结果拟合最好。并将动力学方程预测的q(1)值与实验数据进行了比较。结果表明，拟二阶方程为吸附过程提供了最好的相关性。并对铅离子在栲胶树脂上的吸附机理进行了探讨。(C) 2007 Elsevier B.V.版权所有
The adsorption of lead onto valonia tannin resin studied using a batch adsorber. The aim of this study was to understand the mechanisms that govern lead removal and find a suitable equilibrium isotherm and kinetic model for the lead removal in a batch reactor. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich equations. The equilibrium data fit well the Langmuir isotherm. The experimental data were analyzed using four adsorption kinetic models - the pseudo first- and second-order equations, the Elovich equation and intraparticle diffusion equation - to determine the best fit equation for the adsorption of lead-ions onto valonia tannin resin. The characteristic parameters for each kinetic models have been determined and the correlation coefficients have been calculated in order to assess which model provides the best fit predicted data with experimental results. Also, predicted q(1) values from the kinetic equations were compared with the experimental data. Results show that the pseudo second-order equation provides the best correlation for the adsorption process. Adsorption mechanism was also proposed for the adsorption of lead-ions onto valonia tannin resin. (C) 2007 Elsevier B.V. All rights reserved.