硅藻土表面羟基的漫反射红外光谱(DRIFT)研究  

Study on the Surface Hydroxyl Species of Diatomite using DRIFT Spectroscopy

作　　者：袁鹏[1] 吴大清[1] 林种玉[2] 刁桂仪[1] 彭金莲[1] 魏俊峰[1] 

机构地区：[1]中国科学院广州地球化学研究所 [2]厦门大学化学化工学院,福建厦门361005

出　　处：《光谱学与光谱分析》2001年第6期783-786,共4页Spectroscopy and Spectral Analysis

基　　金：广东省自然科学基金 (No 980 748);厦门大学固体表面物理化学国家重点实验室开放基金 (No 991 1 );中国科学院广州地球化学研究所联合资助项目

摘　　要：运用傅里叶变换漫反射红外光谱 (DRIFT)及氘化技术 ,研究了硅藻土的表面羟基结构及其在热处理中的变化。Using DRIFT spectroscopy, we detected surface hydroxyl structure of diatomite in this study. There were either isolated hydroxyl groups or H-bonded hydroxyl groups on the surface of the diatomite. At room temperature, the diatomite surface was predominantly covered by weakly adsorbed water in cavity and water bonded to surface hydroxyl groups via H-bonds. There appeared a broad band with middle wavenumber at 3 400-3 500 cm(-1) as a result in the corresponding DRIFT spectra. With driving off adsorbed water by heating the sample from 200degreesC to 1000degreesC, the broad band fade away gradually, and a single band at about 3 745 cm(-1), which is attributed to both isolated hydroxyl groups and partial H-bonded hydroxyl groups, became more and more intense with increasing temperature. Under the heat treatment conditions of 1 100degreesC for one hour, the isolated hydroxyl groups were mostly desorbed from the surface, and the H-bonded hydroxyl groups that existed above the inner wall of micropores with diameter of circa 10 nm, however, had not yet condensed thoroughly. The thermal behavior was supposed to be a speciality of diatomite.

关 键 词：硅藻土 表面羟基 混反射红外光谱 结构 氘化技术 矿物 

分 类 号：P575.4[天文地球—矿物学]