SBA-16接枝γ-氨丙基-3-乙氧基硅烷的研究

Study on grafting 3-aminopropyl triethoxy silane onto SBA-16

介孔二氧化硅SBA-16接枝含氨基的有机硅烷偶联剂APTES对于固载药物、吸附生物质及催化反应具有重要的意义。研究了SBA-16接枝γ-氨丙基-3-乙氧基硅烷(APTES)的最佳反应条件。将SBA-16高温活化后,在甲苯、异丙醇、乙腈及二甲基亚砜4种不同极性的反应介质中接枝APTES,通过XPS、FTIR、BET等手段表征了接枝前后的样品。结果表明,低极性反应介质中APTES接枝效果优于高极性反应介质,极性越小越有利于硅烷化反应。在4种反应介质中,甲苯为最佳反应溶剂。在低极性甲苯溶剂中,通过单因素实验和正交实验分析法确定SBA-16的质量为1 g,APTES用量为1 m L,反应温度为80℃,反应时间为8 h时,其相对接枝率达到最大。

Grafting（ 3-aminoproy） triethoxy silane（ APTES） onto mesoporous silica SBA-16 is of great significance for supporting medicines,biomass adsorption and catalytic reaction. The optimal reaction conditions for grafting APTES onto SBA-16 are studied. After being activated at high temperature,SBA-16 is grafted with APTES by using toluene,isopropyl alcohol,acetonitrile and dimethyl sulfoxide as reaction media respectively,and then the grafted SBA-16 samples and the pure SBA-16 samples both are verified by XPS,FTIR,EDS and BET.The results show that lowpolar reaction medium is more beneficial than high-polar one for grafting APTES onto SBA-16. Toluene is the best reaction medium. In toluene solvent,by means of single factor and orthogonal experiment,it is demonstrated that the relative grafting rate reaches the maximum when the specimen contains 1 g of SBA-16,1 m L of APTES,and the reaction temperature and time are 80℃ and 8 h respectively.