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采用溶胶—凝胶法制备了纯TiO2、Fe-TiO2、N-TiO2以及Fe-N-TiO2,并将其负载于瓷砖上,使用XRD和SEM技术对薄膜样品的晶型和表面形态进行表征,以甲醛为目标降解物,测试其光催化降解效果。结果表明,Fe-N-TiO2(500℃)光催化剂以锐钛矿结构为主,粒径分布均匀,平均粒径较小。共掺杂离子的掺杂量、掺杂配比和光催化剂的煅烧温度均影响纳米TiO2的光催化性能,当掺杂配比为n(Fe)∶n(N)∶n(TiO2)=0.1%∶1%∶1、煅烧温度为500℃时,Fe-N共掺杂样品对甲醛降解效率最高,在紫外光照射下Fe-N-TiO2在2 h内对甲醛的降解率达到53%,高于Fe-TiO2的45%、N-TiO2的43%和纯TiO2的25%。
The pure TiO2, Fe-TiO2, N-TiO2 and Fe-N-TiO2 were prepared by sol-gel method and supported on the ceramic tile. The crystal structure and surface morphology of the samples were characterized by XRD and SEM. Formaldehyde as the target degradation products, the test of its photocatalytic degradation. The results show that the anatase structure of the Fe-N-TiO2 (500 ℃) photocatalyst is uniform with uniform particle size distribution and smaller average particle size. The doping amount of doping ions, doping proportion and photocatalyst calcination temperature all affect the photocatalytic activity of nano-TiO2. When the doping ratio is n (Fe): n (N): n (TiO2) = 0.1% : 1%: 1, the calcination temperature is 500 ℃, Fe-N co-doped samples of formaldehyde degradation efficiency of the highest under UV irradiation Fe-N-TiO2 in 2 h formaldehyde degradation rate of 53%, high 45% of Fe-TiO2, 43% of N-TiO2 and 25% of pure TiO2.