【摘要】 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389.11m2/g。更多还原

【Abstract】 Nano TiO2/SiO2 was prepared by means of sol-gel method using tetraethyl orthosilicate and tetrabutylorthotitanate as precursors and glacial acetic acid as depressor.Effects of elements,such as contents of H2O,stabilizer,catalyst,ethyl alcohol,reaction temperature,and etc.,in the preparing process were discussed.XRD,FT-IR and BET analyses were used to characterize TiO2/SiO2 particles,and the results showed that dropping reaction method was appropriate for the whole preparing process of TiO2/SiO2 photocatalytic composite particles under room temperature.Ratios of components were expressed as n(TEOS+TBOT) :n(EtOH):n(HCl):n(H2O)=1 :16 :0.06 :4;n(TBOT) :n(HAc)=1 :0.6.The crystalline phase of TiO2/SiO2 particles obtained was anatase;SiO2 was admitted into the crystalline structure of TiO2,and the chemical bonds of Ti-O-Si were formed.The specific surface area of the catalyst was much larger than that of pure TiO2 particles,reaching 389.11 m2/g when xTi :xSi=3.更多还原