Removal of zinc ions as zinc chloride complexes from strongly acidic aqueous solutions by ionic exchange
Removal of zinc ions as zinc chloride complexes from strongly acidic aqueous solutions by ionic exchange
复制标题
通过离子交换从强酸性水溶液中去除氯化锌络合物形式的锌离子
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
P. Ilea
中科院分区：
文献类型：
--
作者：
Emilia Gîlcă;A. Măicăneanu;P. Ilea
本研究的目的是比较几种阴离子交换剂，并研究 Amberlite IRA410 从盐酸溶液 (1 M) 中去除氯化物 [ZnCl3]− 形式的锌的能力。考虑了搅拌速率、树脂量和锌初始浓度等工艺参数对去除过程的影响。在相同的工作条件（500 rpm、5 g 树脂和 500 mg L−1）下，Amberlite IRA410 获得了所考虑的阴离子交换剂之间最高的实验离子交换容量，8.34 mg g−1。随着锌离子浓度的增加，离子交换容量增加至19.31 mg g−1 (1100 mg L−1)。使用 Langmuir、Freundlich、Temkin 和 Dubinin-Radushkevich 等温线模型对实验数据进行分析。还使用吸附动力学模型、伪一级、伪二级、颗粒内和薄膜扩散模型对结果进行了分析。根据 Dubinin-Radushkevich 和 Temkin 等温线模型，计算出平均自由能和吸附热分别为 7.45 kJ mol−1 和 1×10−4 kJ mol−1，这表明锌吸附具有物理吸附过程的特征。动力学研究表明吸附遵循准二级动力学模型。
The aim of this study was to compare several anion exchangers and to investigate the capacity of Amberlite IRA410 to remove zinc as chloride [ZnCl3]− from hydrochloric solutions (1 M). Influence of the process parameters such as stirring rate, resin quantity and zinc initial concentration over the removal process, was considered. The highest experimental ionic exchange capacity between the considered anionic exchangers, in the same working conditions (500 rpm, 5 g resin and 500 mg L−1), was obtained for Amberlite IRA410, 8.34 mg g−1. With an increase of zinc ions concentration, ionic exchange capacity increased up to 19.31 mg g−1 (1100 mg L−1). The experimental data were analysed using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherm models. The results were also analyzed using sorption kinetics models, pseudo-first-, pseudo-second-order, intra-particle and film diffusion models. From the Dubinin-Radushkevich and Temkin isotherm models the mean free energy and heat of sorption were calculated to be 7.45 kJ mol−1, respectively 1×10−4 kJ mol−1, which indicates that zinc sorption is characterized by a physisorption process. Kinetic studies showed that the adsorption followed a pseudo-second-order kinetic model.