微波法磷改性斜发沸石的结构及水中除砷的研究  

STUDY ON THE STRUCTURE AND ARSENIC(Ⅲ) REMOVAL FROM WATER FOR PHOSPHORUS MODIFIED CLINOPTILOLITES BY MICROWAVE IRRADIATION

作　　者：李曼尼[1] 杨睿媛[1] 吴瑞凤[1] 张景林[1] 

机构地区：[1]内蒙古大学化学化工学院,呼和浩特010021

出　　处：《环境化学》2003年第6期591-595,共5页Environmental Chemistry

基　　金：国家自然科学基金资助项目 (No 2 98670 0 1 )

摘　　要：采用固固相、固液相同晶取代对斜发沸石进行微波法磷改性 ,并对改性前后的矿样采用化学分析 ,XRD ,31 PMASNMR等手段表征 .结果表明 ,虽然微波磷改性不能改变沸石单斜晶系的主体骨架结构 ,但由于脱Al,脱Si和P同晶取代 ,使晶胞体积收缩 ,结晶度下降 ,比表面积、孔体积明显减小 ,骨架中Si和Al的键合方式发生变化 ,有四配位硅的Si—O—P结构出现 ,该结构是沸石阴离子交换的结构基础 .沸石去除水中砷的结果表明 ,改性前 ,沸石去除水中砷的能力很小 ,属表面物理吸附 .改性后 ,沸石去除水中砷的能力明显增强 ,属阴离子交换 .Clinoptilolite was modified by the microwave irradiation and solid solid,solid liquid isomorphorus substitutions of phosphorus into the aluminosilicate framework.The original and modified clinoptilolites were characterized by chemical analysis,XRD,and 31 P MAS NMR.The results showed that the essential framework structures of the modified clinoptilolites were not changed.The cell volumes were constricted,and crystallinities,specific areas and porous valumes were decreased obviously.The atom bonding ways in the framework were changed because of phosphorus isomorphorus substitution.The Si-O-P bonds for tetrahedral silicon appeared in the phosphorus modified clinoptilolites,which was the structure source of anion exchange.The results for arsenic(Ⅲ)removal from water by clinoptilolites showed that,before the modification the capacity for arsenic(Ⅲ)removal is poor due to the surface physical adsorption.After the modification,however the capacity for arsenic(Ⅲ)removal is highly increased due to the anion exchange.The arsenic(Ⅲ)removal was effected obviously by solution acidity and the method of isomorphorus substitution for clinoptilolite.

关 键 词：微波法 磷 改性 斜发沸石 水 除砷 阴离子交换 废水处理 

分 类 号：X703[环境科学与工程—环境工程]