高岭石/甲醇复合物结构及其脱嵌动力学研究  

Structure and De-intercalation Kinetics of the Kaolinite/Methanol Complex

作　　者：程宏飞[1] 刘庆贺 贾晓辉 周熠[1] 

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2期389-396,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"资助;国家自然科学基金(41602171);北京市科技新星计划(2015B081)

摘　　要：目前对高岭石/二甲基亚砜(Kaol-DMSO)和高岭石/甲醇(Kaol-Me)复合物的研究大多局限于对其表面特征分析,鲜有对其脱嵌动力学特征研究的报道。本文在综合分析Kaol-DMSO和Kaol-Me复合物结构的基础上,重点针对其脱嵌动力学特征进行分析。结果表明:与二甲基亚砜(DMSO)分子依靠氢键结合在高岭石晶层间不同,甲醇(Me)分子是取代高岭石晶层八面体结构中Al-OH的-H形成甲氧基嫁接在晶层中。由于DMSO和Me在高岭石层间有着两种不同的存在状态,所以Kaol-Me复合物的活化能大于Kaol-DMSO插层复合物的活化能。活化能的大小反映了其结构的稳定性,据其活化能值推断Kaol-Me复合物的稳定性大于Kaol-DMSO插层复合物。At present, most of the studies on kaolinite-dimethylsulfoxide （Kaol-DMSO） and kaolinite- methanol （Kaol-Me） complexes limited to the analysis of their surface features, few study on the characteristics of its de-intercalation reaction kinetics was reported. Based on the comprehensive analysis of the structure of Kaol-DMSO and Kaol-Me complexes, this paper focuses on the analysis of the de- intercalation reaction kinetics of the complexes. It is indicated that it is different from DMSO molecules, which rely on hydrogen bonding existing interlayer of kaolinite, the methanol （Me） molecules replaced the -H group of the A1-OH in the kaolinite layer to form a methoxy group grafted in the interlayer. Because of the different existence states of DMSO and Me in kaolinite interlayer, the activation energy E of the Kaol-Me complex is greater than the Kaol-DMSO complex. Moreover, the activation energy E reflects the stability of the structure, therefore, it is concluded that the stability of the Kaol-Me complex is greater than that of the Kaol-DMSO complex.

关 键 词：高岭石 二甲基亚砜 甲醇 插层复合物 脱嵌动力学 

分 类 号：TQ424.25[化学工程]