阳离子交换容量和烷基链链数对有机蒙脱石性能的影响  

Influence of Cation Exchange Capacity and Numbers of Alkyl-Chains on the Property of Organo-Montmorillonites

作　　者：马月红[1,2] 何宏平[1] 朱建喜[1] 袁鹏[1] 周琴[3] 梁晓亮[1,2] 卿艳红[1,2] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国科学院研究生院,北京100049 [3]清华大学环境科学与工程系,北京100084

出　　处：《矿物学报》2010年第1期9-17,共9页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:40673077);中国科学院知识创新重要方向项目(批准号:kzcx2-yw-112);国家自然科学杰出青年基金(批准号:40725006);"863"国家高技术研究发展计划(批准号:2008AA06Z328)

摘　　要：已有研究表明影响有机蒙脱石性能的因素很多,除了有机改性剂的特性外,蒙脱石的晶体化学特征也是不容忽视的因素。为了探讨烷基链链数和阳离子交换容量与有机蒙脱石性能之间的关系,本文选择3种不同阳离子交换容量的蒙脱石为主体,4种季铵盐阳离子改性剂十八烷基三甲基溴化铵(S18)、双-十八烷基二甲基溴化铵(D18)、十二烷基三甲基溴化铵(S12)和双-十二烷基二甲基溴化铵(D12)为客体,在不同添加量条件下(0.2、0.5、1.0、1.5、2.0、2.5、3.0、4.0CEC)制备了多个系列的有机蒙脱石,并用XRD、TG-DTG等手段对产物进行表征。实验结果表明,阳离子交换容量与层间柱撑高度之间不存在明显的相关性,但对表面活性剂在蒙脱石上的吸附量有显著的影响,吸附量随着阳离子交换容量的增加而增加。双链表面活性剂对蒙脱石层的撑开能力比单链更强,在层间具有更复杂的自组装过程,导致其热分解过程更为复杂。Both the nature of surfactant and crystal chemistry of montmorillonite affect the property of organo-montmorillonites.To study their correlation,three montmorillonites having different cation exchange capacities and four types of surfactants were used to synthesized organo-montmorillonites at different concentration（0.2,0.5,1.0,1.5,2.0,2.5,3.0,4.0 CEC）.The basal spacings were obtained from XRD patterns.Thermal stability as well as the adsorption capacities of surfactants to montmorillonites were discussed according to the TG-DTG data.The results suggest that the CEC does not greatly impact basal spacing whereas dramatically influence adsorption capacities which increased with the increasing CEC.The behaviors of organo-montmorillonites prepared with single-and double-chains surfactants were distinguishing,implying the latter had stronger ability to expand the layers and also the intercalated surfactants adopted more complex arrangement modes in thermal stability.

关 键 词：蒙脱石 阳离子交换容量 层间距 热分析 

分 类 号：P578.98[天文地球—矿物学] P579[天文地球—地质学]