不同后处理条件对St?ber二氧化硅样品表面基团的影响规律  

Effect of different post-treatment conditions on surface groups of St?ber silica samples

作　　者：李姗姗[1] 万泉[2] 覃宗华[2] 傅宇虹[2,3] 谷渊涛 LI Shanshan;WAN Quan;QIN Zonghua;FU Yuhong;GU Yuantao(School of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]贵州师范大学化学与材料科学学院,贵州贵阳550001 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵州贵阳550081 [3]中国科学院大学地球科学学院,北京100049

出　　处：《中国粉体技术》2018年第5期66-71,共6页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:41473064;贵州师范大学2016年博士科研启动项目

摘　　要：选择经典的St?ber二氧化硅为代表性样品,采用热红联用技术(TG-DSC-FTIR)分析不同溶剂洗涤(水和乙醇)、不同温度干燥的St?ber二氧化硅样品,探讨表面羟基、乙氧基随后处理条件的变化规律。结果表明:水洗能水解表面的乙氧基而形成羟基,乙醇洗涤通过酯化作用使表面羟基转化为乙氧基;NH_3对St?ber二氧化硅孔内外乙醇与羟基的酯化过程具有显著的催化作用,NH_3存在时在50℃较低温度下干燥也能促进乙氧基的形成。The classical Stober silica was selected as representative samples,which were washed with different solvents(water and ethanol),dried at different temperatures and then analyzed systematically by TG-DSC-FTIR.The variation of surface hydroxyl and ethoxyl groups with post-treatments were investigated.The results demonstrate that water washing can hydrolyze ethoxyl groups into hydroxyl groups and ethanol washing can convert surface hydroxyls into ethoxyl groups by esterification.Ammonia can remarkably catalyze the esterification between ethanol and surface hydroxyls inside and outside of Stober silica pores.Even with the relatively low temperature of 50℃drying,ammonia is still able to promote the formation of ethoxyl groups.

关 键 词：Stober二氧化硅 后处理 酯化 

分 类 号：TB321[一般工业技术—材料科学与工程]