(華南農(nóng)業(yè)大學 理學院，廣州 510642)
摘 要: 通過溶膠−凝膠法、浸漬−提拉法在玻璃片表面制備一系列摻雜鉺的TiO2薄膜(Er-TiO2)。并利用XRD、SEM、DRS、FS等技術對摻鉺TiO2薄膜進行表征，通過甲基橙溶液的光催化降解評價其光催化性能。結果表明：所制光催化劑為銳鈦礦型；鉺摻雜使TiO2薄膜的吸收光向長波方向移動。適量鉺摻雜能夠提高TiO2薄膜的FS光譜強度，這可能是因為鉺摻雜能夠使表面氧空位和缺陷的濃度增加；FS光譜強度越高，薄膜的光催化活性越高。當摻雜濃度為1.0%，鍍膜層數(shù)為4層，煅燒溫度為500℃時，Er-TiO2薄膜的光催化活性最高。
關鍵字: TiO2薄膜；鉺摻雜；溶膠−凝膠法；光催化；
TiO2 films on glass surface
（College of Science, South China Agricultural University, Guangzhou 510642, China）
Abstract:A series of erbium-doped TiO2(Er-TiO2) films coated on glass surface were prepared with sol-gel and dip-coating method, and also were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis diffuse reflectance spectroscopy (DRS) and fluorescence spectrum (FS). The photocatalytic activity of the thin films was evaluated by photocatalytic degradation of methyl orange under UV irradiation. The results show that the crystalline phase of erbium doping photocatalysts is only anatase. Er-TiO2 thin films exhibit a shift of the UV-Vis absorption towards longer wavelengths. Er doping can improve the intensity of fluorescence spectra with an appropriate content, which is attributed to increasing the content of surface oxygen vacancies and defects. The higher the FS intensity, the higher the photocatalytic activity. The photocatalytic degradation results show that when the optimum molar fraction of Er is 1.0%, the number of optimal coatings layers is 4, and the optimal heat-treatment temperature for the Er-doped TiO2 film is 500 ℃.
Key words: TiO2 film; erbium doping; sol-gel method; photocatalytic
