SiO_2/PAA/Ag复合纳米粒子的制备、表征及催化性能  

Preparation,characterization and catalytic property of SiO_2/PAA/Ag composite particles

作　　者：郑净植[1] 王柃 陈嵘[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程教育部重点实验室,武汉430074

出　　处：《华中师范大学学报（自然科学版）》2014年第1期66-70,共5页Journal of Central China Normal University：Natural Sciences

基　　金：湖北省教育厅自然科学研究基金重点项目(D20121504)

摘　　要：利用溶胶-凝胶法合成胶体二氧化硅微球,用甲基丙烯酰氧丙基三甲氧基硅烷（γ-MPS）对其修饰从而连接上可供聚合的双键,然后采用原位聚合方法合成二氧化硅-聚丙烯酸（SiO2/PAA）核壳型复合微球,以此为模板采用化学还原法得到SiO2/PAA/Ag复合纳米粒子.采用FT-IR、TGA、TEM、XRD和UV-Vis对复合粒子的形貌、结构进行表征.结果表明,银纳米粒子（粒径15～20 nm）均匀地分散在SiO2/PAA表面.催化性能研究结果表明,SiO2/PAA/Ag对4-硝基苯酚的硼氢化钠还原反应具有良好的催化性能,1h内4-硝基苯酚的转化率达到96.4％.Colloidal silica microspheres were synthesized by sol-gel process and then modified with 3-methacryloxypropyltrimethoxysilane （γ-MPS）,then by means of in situ polymerization of acrylic acid （AA）,core-shell SiO2/PAA composite microspheres were fabricated.The SiO2/PAA/Ag composite particles were obtained through the adsorption and subsequent reduction of Ag＋ ions.The chemical structure and morphologies of SiO2/PAA/Ag were investigated by FT-IR,TGA,TEM,XRD and UV-Vis.The results indicate that the silver nanoparticles （15～20 nm） are homogenously distributed on the surface of silica.SiO2/PAA/Ag composite particles have good catalytic property in the reaction of 4-nitro phenol transformed to 4-amino phenol.

关 键 词：二氧化硅 纳米银 复合粒子 催化性能 

分 类 号：O648[理学—物理化学]