盐酸改性对天然斜发沸石孔道特征、成分、表面电位及阳离子交换性能的影响  

Effects of hydrochloric acid modification on the channel characteristics,composition,surface potential and cation exchange behavior of natural clinoptilolite

作　　者：霍汉鑫[1] 林海[1] 董颖博[1] 刘泉利[1] 曹丽霞[1] 程皝[1] 汪涵[1] 傅川[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《工程科学学报》2015年第6期746-750,共5页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51174017)

摘　　要：采用不同浓度盐酸对天然斜发沸石进行改性,并系统地研究了改性沸石的孔道特征、化学成分、表面电位及阳离子交换性能的变化.盐酸改性后,沸石晶体结构破坏较小,表面变得疏松粗糙,K+、Na+、Ca2+和Mg2+元素含量均小幅下降;表面负电荷增加,阳离子交换容量减小;比表面积和总孔体积均有所提高,最高分别从原沸石的35.97 m2·g-1和0.0761 m3·g-1提高至64.46 m2·g-1和0.1156 m3·g-1.盐酸改性对沸石微孔、介孔和大孔的分布影响明显.从迟滞回线形状判断沸石孔道类型均为不均匀狭缝型孔道,盐酸改性不会改变沸石孔道类型.Natural clinoptilolite was modified by different concentrations of hydrochloric acid. Systemic investigations were performed on the channel characteristics, chemical composition, surface potential, and cation exchange behavior of the modified clinoptilolite. It is found that the surface of the modified clinoptilolite becomes loose and rough, the contents of K ＋ , Na ＋ , Ca2＋ , and Mg2＋ slightly decrease, the surface negative charges increases, and the cation exchange capacity decreases to some extent. The specif- ic surfaee area and total pore volume are improved and the maximum values of them increase from 35.97 m2 .g-1 and 0. 0761 m3 ·g -1 to 64. 46 m2· g - 1 and 0. 1156 m3 · g - 1, respectively. The distribution of micropores, mesopores, and macropores is obviously impacted, and the type of zeolite cavities is determined to be uneven slits by the hysteresis loop shape, indicating that this aeid modification cannot change zeolite cavities.

关 键 词：沸石 改性 盐酸 比表面积 孔径分布 离子交换 

分 类 号：TQ424.23[化学工程] X703.1[环境科学与工程—环境工程]