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以钛酸丁酯为原料,以硝酸铜为铜源,利用溶胶-凝胶法原位制备铜离子掺杂TiO_2。考察催化剂降解亚甲基蓝的光催化性能,利用X射线衍射、紫外-可见漫反射吸收光谱对其晶相结构与光响应性能进行表征。结果表明:焙烧温度为450℃,铜掺杂量为0.6%(摩尔分数)时,Cu~(2+)/TiO_2催化性能最佳。紫外光照射80min后,亚甲基蓝的降解率达到96.4%,为纯TiO_2的1.41倍。TiO_2的活性相为锐钛矿,金红石相出现时光催化活性降低。少量Cu~(2+)的修饰降低了TiO_2的平均晶粒半径,显著增强了TiO_2的光响应性能。
Copper titanate doped TiO2 was prepared in situ using butyl titanate as raw material and cupric nitrate as copper source by sol - gel method. The photocatalytic performance of the catalyst for the degradation of methylene blue was investigated. The crystal structure and photo-responsive properties of the catalyst were characterized by X-ray diffraction and UV-Vis absorption spectra. The results show that Cu 2 + / TiO 2 has the best catalytic performance when the calcination temperature is 450 ℃ and the copper doping amount is 0.6% (mole fraction). After 80min UV irradiation, the degradation rate of methylene blue reached 96.4%, which was 1.41 times that of pure TiO_2. The active phase of TiO 2 is anatase and the photocatalytic activity of rutile phase is decreased. A small amount of Cu 2+ modified the average grain radius of TiO 2 and significantly enhanced the light responsiveness of TiO 2.