摘要
通过对高州蒙脱石及其酸化产物的X射线衍射、化学全分析、魔角旋转核磁共振谱（MASNMR）的研究发现，酸化导致蒙脱石成分和结构都发生一定程度的变化，特别是魔角旋转核磁共振谱研究发现，高州蒙脱石分别在八面体片和四面体片中存在六配位铝和四配位铝；其酸化产物由于八面体片内脱羟基，新出现了一类四配位铝。蒙脱石酸化后物化性能的改善至少与酸化引起的层间域中离子交换、八面体片内阳离子溶出及八面体片内脱羟基等因素有关。
Montmorillonite sample from Gaozhou and its acidified products have been studied byXRD,chemical analysis and MAS NMR. By acidification,some changes in composition and struc-ture have been found. Before acidified,two kinds of Al with different structures (one is of four-coor-dination in the tetrahedral structural layer and the other is of six-coordination in the octahedralstructural layer) were identified by 27Al MAS NMR,and a new kind of four-coordination Al wasfound in the acidification products. It was formed because of dehydroxylation of the octahedralstructural layer. The properties of acidified montmorillonite were considered to be related to ex-change reaction in the interlayer region,dissolution of cations within the octahedral structural lay-er,and dehydroxylation of the octahedra1 structural layer.
出处
《矿物学报》
CAS
CSCD
北大核心
1998年第2期189-193,共5页
Acta Mineralogica Sinica
基金
中国科学院广州地球化学研究所所长基金
武汉物理研究所波谱
分子和原子物理国家重点实验室测试基金
关键词
酸化
蒙脱石
化学成分
矿物结构
acidification
montmorillonite
composition and structure
