Preparation and Properties of Nano-TiO2 Photocatalysis Material by Sol-gel Method
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摘要: 以钛酸丁酯为前驱体,聚乙二醇为模板剂,通过溶胶-凝胶工艺合成纳米TiO2光催化材料。利用XRD、SEM、UV-Vis对试样进行表征,以甲基橙模拟污染源,测试不同煅烧温度下纳米TiO2样品在紫外光照射下的催化活性。研究结果表明:样品在500、600℃煅烧时为单一的锐钛矿相,当温度升高到700℃时,为锐钛矿相与金红石相的混合相。双相组织晶粒细小,分散有序,形成相对有序的孔道结构,大大提高光催化的性能,最大吸收峰出现在波长432 nm处,吸收速度快,效果好。Abstract: Nano-TiO2 photocatalysis material was prepared by sol-gel method using butyl titanate as precursor and polyethylene glycol as template agent. The samples of nano-TiO2 were characterized by XRD,SEM and UV-Vis. The catalytic activities of the TiO2 samples prepared at different calcination temperatures were tested under ultraviolet irradiation with methyl orange as simulative pollutant.The results show that the samples prepared at 500 and 600℃ are composed of single anatase phase and a mixed phase of anatase and rutile is obtained with calcination at 700℃ for the nano-TiO2. The crystal size of the nanoTiO2 increases with increase in the calcination temperature,leading to decrease in the degradation rate of methyl orange.The maximum adsorption peak of the nano-TiO2 appears at the wavelength of 432 nm with a favorable adsorption effect and a quick adsorption speed,which can reach the adsorption equilibrium in about 30 min.
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Key words:
- TiO2 /
- photocatalysis /
- sol-gel method /
- methyl orange /
- degradation rate
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