化工进展Issue(1)：320-326,7.DOI:10.16085/j.issn.1000-6613.2016.01.044
改性MCM-41分子筛对阴离子偶氮染料的吸附作用机理
Adsorption performance of anionic azo dye by the modified MCM-41 mesoporous molecular sieve
摘要
Abstract
The adsorption efficiency of the anionic azo dye (methyl red) on amino-modified ordered mesoporous silica (NH3+-MCM-41) have been investigated. The research results indicate that the surface charge of MCM-41 are redistributed after the amino modification. By means of the electrostatic effect,the adsorption efficiency of methyl red on NH3+-MCM-41 was 90.4% which was 1.1 times more than that on the unmodified MCM-41. The pH value of the solution determines the surface charge of NH3+-MCM-41 and then affects the adsorption efficiency,and the optimal pH value is 4. The impurity ions in the methyl red solution also influence the adsorption efficiency through competitive adsorption. When the solution contains only Cl− and NO3−,there is little effect on the adsorption efficiency. But when the solution contains the weak acid anion with high valence,such as CO32−and HPO42−,the adsorption efficiency is greatly reduced and there is no methyl red adsorbed. Through the adsorption kinetics study,the adsorption rate is quasi second order rather than quasi first order,indicating the presence of chemical adsorption,which involves electron sharing or electron transfer between the agent and the adsorbate.关键词
吸附/甲基红/分子筛/表面电荷Key words
adsorption/methyl red/moleclar sieves/surface charge分类
资源环境引用本文复制引用
全姗姗,朱玉婵,任占海,郗腾,鲁明珠,任占冬..改性MCM-41分子筛对阴离子偶氮染料的吸附作用机理[J].化工进展,2016,(1):320-326,7.基金项目
湖北省自然科学基金（2012FFB04803）、武汉轻工大学科研项目（2012Y05）及国家自然基金青年（31101370）项目。 （）
