涂铁砂吸附镉的动力学研究  

Kinetic Study on Adsorption of Cadmium by IOCS

作　　者：陈文[1] 魏群[1] 张伟[1] 

机构地区：[1]湖南城市学院,益阳413000

出　　处：《环境科学与技术》2007年第9期36-38,共3页Environmental Science & Technology

摘　　要：研究了10℃,20℃,40℃的温度下,涂铁砂(Iron oxide coated sand,简称IOCS)对镉的吸附动力学。镉在IOCS表面的吸附可分为两个阶段,吸附反应的前60min为快速吸附阶段,60min后,吸附速率明显变慢。温度升高加快了镉在IOCS表面的吸附速率。用Elovich动力学模型,准一级反应模型,准二级反应模型,二级反应模型和粒内扩散动力学模型对实验数据进行回归分析,准二级反应模型能更好地描述镉在IOCS表面的吸附,各吸附模型的模拟优劣顺序为:准二级模型>二级模型>Elovich模型>准一级模型>粒内扩散模型。Kinetics of adsorption of cadmium from aqueous solution by iron oxide coated sand(IOCS)was studied under different temperatures. Adsorption of Cd on IOCS was shown to be a two-step process,with rapid in initial 60min and followed by a much slower stage.Adsorption rate was increased as temperature increased.Elovich model,pseudo- first-order model,pseudo-second-order model,second-order model and intraparticle diffusion model were used to test experimental data,with the best performance of pseudo second-order model.

关 键 词：吸附 IOCS 镉 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]