不同结晶度高岭石的带电性研究  

Study on the Chargeability of Kaolinite with Different Crystallinity

作　　者：程宏飞[1] 佘刚 周熠[1] CHENG Hong-fei;SHE Gang;ZHOU Yi(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9期1910-1916,共7页Journal of Synthetic Crystals

基　　金：内蒙古自治区重大科技项目;国家自然科学基金(41602171)

摘　　要：本文采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和热分析(TG-DSC)等三种表征手段,对四个不同地区高岭石样品的结构特征进行了研究。结果表明,高岭石结晶度高低顺序为:淮北>大同>龙岩>清远,Hinckley结晶度指数与脱羟基温度具有较好的相关性。利用电泳仪测定了高岭石颗粒在不同pH条件下的表面电位,并且通过线性拟合pH值-电位图得到了不同结晶度高岭石的零电荷点(PZC)。进一步研究得出4种高岭石具有相近的PZC,其范围为3.2~4.3。在pH=7条件下,高岭石的表面电位与Hinckley结晶度指数呈现正相关,而PZC受结晶度指数的影响不强烈。The structure feature of kaolinites collected from 4 different regions was investigated by XRD,FTIR and TG-DSC.The results show that the crystallinity order of kaolinite is Huaibei>Datong>Longyan>Qingyuan,Hinckley crystallinity index and dehydroxylation temperature show good correlation.The surface potential of kaolinite particles were determined by electrophoresis in different pH conditions,and the point of zero charge(PZC)of kaolinite is obtained by linear fitting to pH-potential curves.Analysis result goes to be that the PZC of 4 kinds of kaolinite is similar,and the PZC range is 3.2-4.3.Under the condition of pH=7,the Hinckley index of kaolinite showed a positive correlation to surface potential,and the PZC is not strongly influenced by the crystallinity index.

关 键 词：高岭石 结晶度 表面电位 零电荷点 

分 类 号：P578.964[天文地球—矿物学]