复合凹凸棒介质对Cr(Ⅵ)吸附动力学和热力学研究  

Study on Adsorption Dynamics and Thermodynamics of Chromium(Ⅵ) by Composite Attapulgite Medium

作　　者：缪伟[1] 黄新[1] 王郑[1] 荆肇乾[1] 周祺[1] 

机构地区：[1]南京林业大学土木工程学院,江苏南京210037

出　　处：《皮革与化工》2010年第1期1-5,共5页Leather And Chemicals

基　　金：江苏高校自然科学研究计划项目:08KJ610003;2007年南京林业大学科技创新基金项目:163050023

摘　　要：研究了复合凹凸棒介质(CAM)对Cr(Ⅵ)的吸附行为,拟合了吸附等温线,探讨了吸附动力学和热力学性质。结果表明,在实验范围内,CAM对Cr(Ⅵ)的吸附可以用Langmuir和Freundlich吸附等温方程来描述,但更符合Freundlich方程,相关系数均在0.98以上;二级动力学方程可以更好地描述吸附动力学规律;分别计算了热力学参数△G0、△H0、△S0,表明该吸附为熵驱动、吸热、自发的过程。Chromium（Ⅵ） adsorption behaviour of composite attapulgite medium（CAM） was investigated in this paper.The adsorption isotherms were linearized,and the dynamics and thermodynamics for the adsorption were discussed.The results showed that the adsorption behaviour could be described by Freundlich and Langmuir equations,yet better fitted by Freundlich equation,with the correlation coefficients over 0.98.The adsorption process followed pseudo-second order rate model.The thermodynamic datas（△G0、△H0、△S0） were calculated,and the results suggested that the adsorption of Cr（Ⅵ） on CAM was a entropy-driving,endothermic and spontaneous process.

关 键 词：复合凹凸棒介质(CAM) Cr(Ⅵ) 吸附过程 动力学 

分 类 号：X703.1[环境科学与工程—环境工程]