LI Shanshan1 ， WAN Quan2 ， QIN Zonghua2 ， FU Yuhong2, 3 ， GU Yuantao2, 3
（1.School of Chemistry and Materials Science， Guizhou Normal University， Guiyang 550001， China； 2. State Key Laboratory of Ore Deposit Geochemistry， Institute of Geochemistry， Chinese Academy of Sciences， Guiyang 550081， China； 3. College of Earth and Planetary Sciences， University of Chinese Academy of Sciences， Beijing 100049， China）
Abstract：The classical Stöber 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 surfacehydroxyl 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 Stöber silica pores. Even with the relatively low temperature of 50 ℃ drying, ammonia is still able to promote the formation of ethoxyl groups.
Keywords：Stöber silica; post-treatment; esterification
中图分类号：TB321 文献标志码：A
文章编号：1008-5548（2018）05-0066-06
DOI：10.13732/j.issn.1008-5548.2018.05.011
收稿日期：2018-01-23， 修回日期：2018-05-25，在线出版时间：2018-10-16。
基金项目：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。
第一作者简介：李姗姗（1981—），女，博士，讲师，研究方向为纳米材料的制备及表征。 E-mail: lss8132@163.com。
通信作者简介：万泉（1971—），男，博士，研究员，研究方向为纳米地球科学。E-mail: wanquan@vip.gyig.ac.cn。
