以钛酸四丁酯、正硅酸乙酯作为前驱体,冰醋酸作为水解抑制剂,用溶胶-凝胶法制备了纳米TiO2/SiO2复合物.讨论了加水量、稳定剂、催化剂、乙醇用量、反应温度等工艺因素对制备过程的影响.用X射线衍射、红外光谱、比表面积仪等测试手段对纳米TiO2/SiO2复合粒子进行了表征.结果表明,用溶胶-凝胶法制备TiO2/SO2复合光催化粒子,整个反应采用滴加方式;各反应组分用量为n(TEOS+TBOT) :n(EtOH) :n(HCl) :n(H2O)=1 :16 :0.06 :4,n(TBOT) :n(HAc)=1 :0.6;反应温度为室温.制备得到的纳米TiO2/SiO2复合粒子主要以锐钛矿型存在;SiO进入TiO2晶体结构中,两者以化学键相结合;TiO2/SiO2复合粒子的比表面积要比纯TiO2粒子的比表面积大得多,当xTi :xsi=3时,TiO2/SiO2复合粒子比表面积达389.11 m2/g.
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