TDTMA^+-柱撑蒙脱石吸附硝基苯的实验研究  

STUDY OF SORPTION OF NITROBENZENE ON THE TDTMA^+-PILLARED MONTMORILLONITE

作　　者：吴伟民[1] 吴平霄[1] 党志[1] 朱能武[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广东广州510640

出　　处：《矿物岩石》2008年第2期17-21,共5页Mineralogy and Petrology

基　　金：国家自然科学基金(40573064);广东省自然科学基金(06025666;04020017);广东省科技计划(2006B36601004);教育部新世纪优秀人才支持计划(NCET-06-0747)

摘　　要：以阳离子表面活性剂(十四烷基三甲基溴化铵,TDTMBA)为柱撑剂,在不同浓度条件下(0.2CEC～2.5CEC)制备了一系列柱撑蒙脱石,并通过XRD对有机蒙脱石进行表征,研究季铵盐离子在层间的排列结构,同时针对TDTMA+-柱撑蒙脱石对硝基苯的吸附进行研究。实验结果表明,吸附去除率受硝基苯的初始浓度、反应时间等因素的影响,而与pH值没有太大的关系。经过柱撑改性后,粘土对硝基苯的吸附能力较原土有了明显的提高。随着层间柱撑浓度的增大,柱撑蒙脱石对硝基苯的吸附量也增大。另外钙基蒙脱石和平卧双层,倾斜单层以及倾斜双层的结构的TDTMA+-柱撑蒙脱石对硝基苯的吸附等温线符Freundlich和Langmuir等温方程,假三层结构的TDTMA+-柱撑蒙脱石对硝基苯的吸附等温线符合Linear等温方程,这表明前者是以表面吸附为主,后者是以分配作用为主。A series of TDTMA^＋-pillared montmorillonite were prepared at different concentrations（0.2 CEC～ 2.5 CEC） of tetradecyhrimethylammonium bromide（TDTMAB）. Using X-ray powder diffraction （XRD） and theoretical size,arrangement models of TDTMA^＋ in the interlayer of montmorillonite have been studied. At the same time, the adsorptions of nitrobenzene on the organoclays have been studied. It shows that adsorption rate is affected by reacting time and initial concentration of nitrobenzene,whereas there are no closely relationship between pH and adsorption. Pillared montmorillonite has higher sorption capability than raw clay. And with the increase of the surgactant packing density within montmorillonite interlayer, the sorption efficiency of organoclays increase and the sorption mechanisms changed from adsorption to partition.

关 键 词：蒙脱石 柱撑蒙脱石 硝基苯 吸附 

分 类 号：P579[天文地球—矿物学]