δ-MnO_2吸附染料亚甲基蓝的动力学和机理  

Kinetic analysis and mechanisms for adsorption of methylene blue from aqueous solution onto δ-MnO_2

作　　者：蔡冬鸣[1] 任南琪[1] 李圭白[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2008年第2期213-216,共4页Journal of Harbin Institute of Technology

基　　金：黑龙江省政府博士后资助基金资助项目;哈尔滨工业大学博士启动基金资助项目

摘　　要：为改善印染废水的深度处理效果,通过静态吸附试验研究δ-MnO2吸附水中阳离子染料亚甲基蓝的动力学和机理.研究混合强度、初始染料质量浓度、MnO2投量、pH和温度对吸附速率的影响,得出表观动力学方程,并考察吸附机理.结果表明:吸附过程符合表观2级动力学方程,物料传递和微孔扩散是限速步骤.试验条件下对亚甲基蓝的吸附容量可达0.244 mg/mg.较高的吸附容量和较快的吸附速率使δ-MnO2有望应用于印染废水深度处理.In order to improve the effect of advanced treatment of dye wastewater, the kinetics and mechanisms of adsorption of a cationic dye, methylene blue, from aqueous solutions by δ-MnO2 was investigated using batch rate experiments. Researches were performed at various strength of mixing, initial dye concentrations, solid loads and pH values. Apparent kinetic model and mechanisms of dye removal were also investigated. Results indicate that the adsorption process obeyed the pseudo -second -order kinetic model. The mass transfer and intraparticle pore diffusion are rate - controlling steps. The adsorption capacity is 0. 244 mg/mg under the condition. The relatively high capacity and quick velocity of sorption make MnO2 a potential sorbent for advanced treatment of dye wastewater.

关 键 词：二氧化锰 阳离子染料 亚甲基蓝 印染废水 吸附 脱色 动力学 

分 类 号：X701[环境科学与工程—环境工程]