黏土矿物-十六烷基三甲基氯化铵作用机理及其结构  

Mechanism and Structure of Clay Minerals-Cetyl Trimethyl Ammonium Chloride Intercalation Compound

作　　者：程宏飞[1] 贾晓辉 豪日娃 刘庆贺 刘文超 CHENG Hong-fei;JIA Xiao-hui;HAO Ri-wa;LIU Qing-he;LIU Wen-chao(School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《人工晶体学报》2018年第12期2547-2554,共8页Journal of Synthetic Crystals

基　　金：内蒙古自治区重大科技项目"高铝煤炭资源循环利用产业链接与优化完善";国家自然科学基金(41602171)

摘　　要：黏土矿物有机插层复合物作为重要的功能材料现已被广泛应用于吸附、化工和环保等众多领域。采用插层法将十六烷基三甲基氯化铵(CTAC)插入到黏土矿物高岭石、钠基蒙脱石和蛭石层间,利用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、热重-差示扫描量热(TG-DSC)及扫描电镜(SEM)等表征方法对插层复合物的作用机理及结构进行研究。结果表明:高岭石在经过多次"替代"插层后,层间氢键被破坏,层间作用力减弱,CTAC分子进入其层间,这引起高岭石片层由于层间的束缚力释放形成卷曲形貌。蒙脱石与蛭石以离子交换的形式与CTAC分子发生反应,该过程尚未对它们的形貌产生明显影响。此外,进一步建立了黏土矿物-CTAC插层复合物的结构模型,提出CTAC分子在高岭石和蒙脱石层间分别以35°和32°的夹角双层斜立,在蛭石层间以44°的夹角单层斜立。Clay mineral organic intercalation compounds are used as important functional materials in adsorption, chemical engineering and environmental protection. Cetyl trimethyl ammonium chloride (CTAC) was intercalated into clay minerals, kaolinite, montmorillonite and vermiculite interlayer by intercalating method, the mechanism and structure of the intercalation compounds were analysed by XRD, FTIR and TG-DSC and SEM. It could be revealed that the interlayer hydrogen bonds are destroyed and the CTAC molecules enter the interlayer after multiple "replacement" of kaolinite. This leads to the formation of a curled morphology of the kaolinite sheet due to release of the binding force between the layers. The montmorillonite and vermiculite react with the CTAC molecules in the form of ion exchange, which does not affect their morphology. structural models of the clay mineral-CTAC intercalation compounds was constructed. The CTAC molecules erectdouble layers between the kaolinite and montmorillonite layers at an angle of 35°and 32°respectively, and slanted single layer at an angle of 44°between the vermiculite layers.

关 键 词：高岭石 蒙脱石 蛭石 十六烷基三甲基氯化铵 插层复合物 

分 类 号：TQ32[化学工程—合成树脂塑料工业]