Real-time determination of kinetics of adsorption of lead(II) onto palm shell-based activated carbon using ion selective electrode
Real-time determination of kinetics of adsorption of lead(II) onto palm shell-based activated carbon using ion selective electrode
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DOI：
10.1016/j.biortech.2007.10.010
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发表时间：
2008-09-01
影响因子：
11.4
通讯作者：
Daud, Wan Mohd Ashri Wan
中科院分区：
文献类型：
--
作者：
Aroua, Mohamed Kheireddine;Leong, S. P. P.;Daud, Wan Mohd Ashri Wan
采用离子选择电极（ISE）实时监测Pb（II）和pH值，研究了棕榈壳基活性炭（PSAC）对Pb（II）的吸附动力学。ISE非常适合于实时吸附动力学数据的收集，因为它有助于以非常特定和短的时间间隔记录吸附数据，并提供一致的动力学数据。研究了初始Pb（II）浓度和搅拌速度。实验结果表明，初始Pb（II）浓度的增加和搅拌速度的增加会导致初始吸附速率的提高。采用拟一阶、拟二阶、Elovich、颗粒内扩散和液膜扩散模型拟合吸附动力学数据。化学吸附是PSAC吸附Pb（II）的速率控制步骤，吸附动力学数据符合拟二阶模型和Elovich模型。(C) 2007 Elsevier Ltd.版权所有。
In this study, the kinetics of adsorption of Pb(II) from aqueous solution onto palm shell-based activated carbon (PSAC) were investigated by employing ion selective electrode (ISE) for real-time Pb(II) and pH monitoring. Usage of ISE was very appropriate for real-time adsorption kinetics data collection as it facilitated recording of adsorption data at very specific and short time intervals as well as provided consistent kinetics data. Parameters studied were initial Pb(II) concentration and agitation speed. It was found that increases in initial Pb(II) concentration and agitation speed resulted in higher initial rate of adsorption. Pseudo first-order, pseudo second-order, Elovich, intraparticle diffusion and liquid film diffusion models were used to fit the adsorption kinetics data. It was suggested that chemisorption was the rate-control ling step for adsorption of Pb(II) onto PSAC since the adsorption kinetics data fitted both the pseudo second-order and Elovich models well. (C) 2007 Elsevier Ltd. All rights reserved.