Mathialagan T, Viraraghavan T
Faculty of Engineering, University of Regina, Regina, SK, Canada.
J Hazard Mater. 2002 Oct 14;94(3):291-303. doi: 10.1016/s0304-3894(02)00084-5.
The present study examined the use of perlite for the removal of cadmium from aqueous solutions. The effects of pH and contact time on the adsorption process were examined. The optimum pH for adsorption was found to be 6.0. Residual cadmium concentration reached equilibrium in 6h and the rate of cadmium adsorption by perlite was rapid in the first hour of the reaction time. Ho's pseudo-second-order model best described the kinetics of the reaction. Batch adsorption experiments conducted at room temperature (22+/-1 degrees C) showed that the adsorption pattern followed the Freundlich isotherm model. The maximum removal of cadmium obtained from batch studies was 55%. Thomas model was used to describe the adsorption data from column studies. The results generally showed that perlite could be considered as a potential adsorbent for cadmium removal from aqueous solutions.
本研究考察了珍珠岩用于从水溶液中去除镉的情况。研究了pH值和接触时间对吸附过程的影响。发现吸附的最佳pH值为6.0。残留镉浓度在6小时内达到平衡，在反应的第一个小时，珍珠岩对镉的吸附速率很快。何的准二级模型能最好地描述该反应的动力学。在室温（22±1℃）下进行的间歇吸附实验表明，吸附模式符合弗伦德里希等温线模型。间歇研究中获得的镉的最大去除率为55%。采用托马斯模型描述柱实验的吸附数据。结果总体表明，珍珠岩可被视为从水溶液中去除镉的潜在吸附剂。
