Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A
Modeling batch kinetics and thermodynamics of zinc and cadmium ions removal from waste solutions using synthetic zeolite A
复制标题
DOI：
10.1016/j.jhazmat.2005.07.021
复制
发表时间：
2005-12-09
影响因子：
13.6
通讯作者：
El Geleel, MA
中科院分区：
文献类型：
--
作者：
El-Kamash, AM;Zaki, AA;El Geleel, MA
研究了使用合成沸石 A 从水溶液中吸附去除锌和镉离子的情况。实验根据溶质浓度和温度 (298-333 K) 进行。使用几种动力学模型来测试实验速率数据并检查吸附过程的控制机制。有效扩散系数等各种参数。评估活化能和活化熵。使用 Langmuir、Freundlich 和 Dubinin-Radushkevich (D-R) 等温线模型分析平衡吸附数据。在测试的模型中，与 Langmuir 模型相比，Freundlich 和 D-R 等温线表达式都更适合实验平衡数据。在所有情况下，平均自由能都在与吸附的离子交换类型相对应的范围内。结果表明，合成沸石A可以作为一种高效的离子交换材料，用于去除工业和放射性废水中的锌和镉离子。 (c) 2005 Elsevier B.V. 保留所有权利。
The sorptive removal of zinc and cadmium ions from aqueous solutions using synthetic zeolite A was investigated. Experiments were carried out as a function of solute concentration and temperature (298-333 K). Several kinetic models were used to test the experimental rate data and to examine the controlling mechanism of the sorption process. Various Parameters such as effective diffusion coefficient. activation energy and entropy of activation were evaluated. Equilibrium sorption data were analyzed using Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models. Of the model tested, both Freundlich and D-R isotherm expressions were found to give better fit to the experimental equilibrium data compared to Langmuir model. The mean free energy is in all cases in the range corresponding to the ion exchange type of sorption. The results indicated that synthetic zeolite A can be used as an efficient ion exchange material for the removal of zinc and cadmium ions from industrial and radioactive wastewaters. (c) 2005 Elsevier B.V. All rights reserved.