Department of Safety, Health and Environmental Engineering, Hungkuang University, No. 34 Chung-Chie Road, Sha-Lu, Taichung 433, Taiwan.
J Hazard Mater. 2009 Dec 15;172(1):46-53. doi: 10.1016/j.jhazmat.2009.06.119. Epub 2009 Jun 30.
The removal of indium ions from aqueous solution was carried out by electrocoagulation in batch mode using an iron electrode. Various operating parameters that could potentially affect the removal efficiency were investigated, including the current density, pH variation, supporting electrolyte, initial concentration, and temperature. The optimum current density, supporting electrolyte concentration, and temperature were found to be 6.4 mA/cm(2), 0.003N NaCl, and 298 K, respectively. When the pH values lower than 6.1, the removal efficiencies of indium ions via electrocoagulation were up to 5 times greater than those by adding sodium hydroxide. The indium ion removal efficiency decreased with an increase in the initial concentration. Results for the indium ion removal kinetics at various current densities show that the kinetic rates conformed to the pseudo-second-order kinetic model with good correlation. The experimental data were also tested against different adsorption isotherm models for describing the electrocoagulation process. The adsorption of indium ions preferably fitting the Langmuir adsorption isotherm suggests monolayer coverage of adsorbed molecules.
采用铁电极进行批式电凝聚法从水溶液中去除铟离子。研究了各种可能影响去除效率的操作参数，包括电流密度、pH 值变化、支持电解质、初始浓度和温度。最佳电流密度、支持电解质浓度和温度分别为 6.4 mA/cm(2)、0.003N NaCl 和 298 K。当 pH 值低于 6.1 时，电凝聚法去除铟离子的去除效率比添加氢氧化钠的去除效率高 5 倍。铟离子去除效率随初始浓度的增加而降低。在不同电流密度下进行的铟离子去除动力学研究结果表明，动力学速率符合准二级动力学模型，相关性良好。还根据不同的吸附等温线模型对实验数据进行了测试，以描述电凝聚过程。铟离子的吸附更适合朗缪尔吸附等温线，表明吸附分子的单层覆盖。
