摘要：以钛酸四丁酯和氢氧化钠为反应物,采用两步水热法制备TiO₂纳米线,并将其原位负载于Al2O3载体上,研究它们对甲基橙的光催化降解性能。结果表明,锐钛矿相TiO₂主要呈纳米线和八面体状负载在Al₂O载体上,当TiO₂负载质量分数为30%,焙烧温度为400℃,催化剂用量为1.332 0 g/L时,TiO₂-Al₂O₃负载型催化剂光催化降解甲基橙的性能最佳,光照5 h后,甲基橙在紫外和太阳光下的降解率分别达到58.9%和55.6%。相同实验条件下,TiO₂-Al₂O₃负载型催化剂对甲基橙的降解率比单纯TiO₂提高了35.1%。

关键词：两步水热法；纳米线；催化剂；光催化

Abstract：TiO₂ nano-wires were prepared by two-step hydrothermal method,using butyl titanate and sodium hydroxide as raw materials.TiO₂-Al₂O₃ loaded catalysts were prepared using Al₂O powders as carrier.Using methyl orange as model reactants,the photocatalytic activity of TiO₂-Al₂O₃ loaded catalysts was researched.The results show that the photocatalytic activity of TiO2-Al2O3 loaded catalysts are better when the loading mass fraction of titania is 30%,the roasting temperature is 400 ℃,and the amount of catalysts is 1.332 0 g/L.Their degradation rates reach 58.9% and 55.6% respectively after UV and sunlight irradiation for 5 h separately.Under the same experimental conditions,the observed degradation rate of methyl orange of TiO₂-Al₂O₃ catalysts are about 35.1% higher than those of pure TiO₂ catalysts as contrast.The crystalline phase of TiO₂ loaded on Al₂O surface is anatase,and TiO₂ particles appear nano-wire-liked and octahedral.

Keywords：two-step hydrothermal；nano-wires；catalyst；photocatalytic