改性δ-MnO_2对刚果红溶液吸附脱色的动力学和机理  

Kinetics and mechanisms of decolorization for Congo Red solution by adsorption on modified δ-MnO_2

作　　者：蔡冬鸣[1] 李圭白[1] 任南琪[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090

出　　处：《黑龙江大学自然科学学报》2006年第5期707-710,共4页Journal of Natural Science of Heilongjiang University

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

摘　　要：研究了改性δ-MnO2对刚果红溶液的脱色动力学和有关限速步骤的机理。考察了振荡频率、MnO2投量、温度、pH值和刚果红初始浓度对脱色速率的影响。结果表明:脱色符合表观二级动力学方程,活化能为5·1kJ·mol-1。吸附过程的限速步骤为内部微孔扩散。较大的吸附容量和较快的吸附速率使改性δ-MnO2具有潜在的印染废水脱色能力。The decolorization kinetics and mechanisms of adsorption of Congo Red removed from solution by δ-MnO2 were investigated. The ogcillating frequency, solid load, temperature, pH and initial dye concentration were considered. The results indicated that the decolorization process obeys the pseudo - second - order kinetics model. The activation energy for rate - controlled step is equal to 5.1 kJ .mol^-1. The rate - controlled step of decolorization is intraparticle pore diffusion. The high adsorption capacity and quick velocity makes modified δ-MnO2 a potential suitable sorbent for application.

关 键 词：改性二氧化锰 染料 刚果红 动力学 印染废水 脱色 

分 类 号：X703[环境科学与工程—环境工程]