CAJ | 학술논문

从含过量水的溶胶出发,在室温下得到了TiO2纳米晶.通过红外光谱,透射电子显微镜法和X射线粉末衍射法对含有过量水的溶胶体系中TiO2纳米晶的室温形成机理进行了研究.与传统的溶胶凝胶法相比,在改良的溶胶凝胶体系中,在缩聚反应之前由于水过量使得钛的先驱体快速且充分的水解,从而生成[TiO6]基团,随之形成TiO2纳米晶.晶粒的尺寸为约3.5 nm,该法得到的TiO2纳米晶比传统溶胶凝胶法得到的TiO2纳米晶和商用光催化剂德固赛P25具有更好的光催化活性.
종함과량수적용효출발,재실온하득도료TiO2납미정.통과홍외광보,투사전자현미경법화X사선분말연사법대함유과량수적용효체계중TiO2납미정적실온형성궤리진행료연구.여전통적용효응효법상비,재개량적용효응효체계중,재축취반응지전유우수과량사득태적선구체쾌속차충분적수해,종이생성[TiO6]기단,수지형성TiO2납미정.정립적척촌위약3.5 nm,해법득도적TiO2납미정비전통용효응효법득도적TiO2납미정화상용광최화제덕고새P25구유경호적광최화활성.
Nanoerystalline titania (TiO2) particles were obtained at room temperature by a modified sol-gel method starting from a solution with large amount of water.The nanoerystalline TiO2 particles prepared with large amount of water at room temperature were characterized by IR,TEM and XRD.Comparing with conventional sol-gel method,the present system offers quick and complete hydrolysis of titanium precursor before polycondensation,thus resulting in [TiO6] units,and the formation of nanocrystalline TiO2 particles with an average grain size of 3.5 nm.Moreover,the as-prepared nanocrystalline TiO2 powders exhibit a better photocatalytic activity than both of the powders prepared by conventional sol-gel method and the commercial photocatalyst Degussa P25.