天然膨润土吸附Cu^(2+)的动力学、等温线及热力学研究  

Study on Kinetics,Isotherm and Thermodynamics of Adsorption of Natural Bentonite to Cu^(2+)

作　　者：吴冬梅[1] 郭春景[2] 

机构地区：[1]中国矿业大学煤矿瓦斯治理国家工程研究中心,江苏徐州221008 [2]黑龙江省质量监督检测研究院

出　　处：《防护林科技》2007年第5期8-11,共4页Protection Forest Science and Technology

基　　金：国家自然科学基金项目(50473032)

摘　　要：文章讨论了不同影响因素如接触时间、振荡速度、膨润土用量、初始离子浓度、初始pH、温度等对膨润土吸附性能的影响,研究了Cu2+在天然膨润土上吸附的动力学、等温线和热力学理论。动力学研究数据表明,吸附满足准二级动力学模型,吸附初始阶段受界面扩散控制,45 min后受粒子内扩散控制;吸附满足Freundlich等温线模型;吸附是一个自发的、吸热的过程,而且反应不可逆。Natural bentonite was used as an adsorbent for the investigation of the adsorption kinetics, isotherms and thermodynamic parameters of Cu^2＋ from aqueous solution at various contact time, the vibrating rate, mass of bentonite, initial concentration of Cu^2＋ , initial pH and temperature. Adsorption meets the pseudo-second-order kinetic model. The initial stage of the adsorption is controlled by interface diffusion and the adsorption can be followed by intraparticle diffusion model after 45 min. The adsorption follows Freundlich isotherm model. The process is spontaneous, endothermie and irreversible.

关 键 词：天然膨润土 吸附 CU^2+ 动力学 热力学 等温线 

分 类 号：S153[农业科学—土壤学]