胺基官能基化的HMS吸附水体中的腐殖酸  

Adsorption of Humic Acid onto Aminated HMS

作　　者：陶琪[1] 许昭怡[1] 郑寿荣[1] 王志良[2] 张利民[2] 夏明芳[2] 

机构地区：[1]南京大学环境学院污染控制与资源化研究国家重点实验室,南京210093 [2]江苏省环境科学研究院江苏省环境工程重点实验室,南京210036

出　　处：《环境科学》2008年第5期1197-1202,共6页Environmental Science

基　　金：国家自然科学基金项目(40402022,20637030);江苏省环境工程重点实验室开放课题项目(KF2007002)

摘　　要：研究了胺基表面官能化前后的HMS(hexagonal mesoporous silica)对腐殖酸的吸附,Freundlich方程拟合结果表明,表面官能化后吸附常数K值由0.56提高至105,反映出表面官能化能显著改善HMS对腐殖酸的吸附,且低pH值条件下吸附效果更佳.表征结果显示,腐殖酸分子主要吸附在表面胺化HMS的中孔孔道内,并首先占据吸附剂中较大的中孔孔道.吸附动力学结果显示腐殖酸在表面胺化的HMS上吸附符合二级动力学,吸附速率主要受孔道内扩散控制.The adsorption of humic acid onto hexagonal mesoporous silica（HMS） and surface aminated HMS was investigated. The simulation results using Freundlich model indicated that the surface amination of HMS led to an increase of adsorption constant from 0.56 to 105, reflecting markedly enhanced adsorption of humic acid upon surface amination. In addition, humic acid adsorption under acidic conditions was favored. Adsorbed humic acid molecules were found to be located in the mesopores of aminated HMS and the mesopores with relatively larger pore diameters were preferentially occupied. The kinetics of humic acid adsorption onto the aminated HMS could be well described by second order kinetics and the adsorption rate was mainly dominated by intrapore diffusion process.

关 键 词：胺基官能化 HMS 腐殖酸 吸附 

分 类 号：X52[环境科学与工程—环境工程]