Abstract In order to effectively overcome the inherent defects of TiO2 in practical applications including low quantum efficiency and wide band gap, the B/Co/Fe tridoped TiO2/SiO2 composite films with high photocatalytic properties were prepared by the sol-gel method. The physicochemical properties of catalysts were characterized by XRD, FE-SEM, EDS, DTA-TG, BET, DRS and PL. The results shown that the compositing of SiO2 and doping of B/Co/Fe ions in TiO2 could effectively inhibit the phase transformation of anatase to rutile and the growing of crystal grains at high annealing temperatures. The compositing of SiO2 could enhance the specific surface area (82.6 increased to 335.8 m2/g) of samples and provide more adsorption sites. The doping of B/Co/Fe tridoping could form impurity levels in the band gap of TiO2 to shorten the band gap energy (2.54 ev). And the B/Co/Fe tridoped TiO2/SiO2 films could increase the interfacial transfer rate and decrease recombination rate of electrons and holes. The photocatalytic activities of the B/Co/Fe tridoped TiO2/SiO2 films were evaluated under UV or visible light irradiation with two pollutants as target for photodegradation. The results indicated that the films exhibited more excellent photocatalytic activities compared to pure TiO2. The plausible photocatalytic degradation mechanism had been proposed.

中文翻译：

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B/Co/Fe三掺杂TiO2/SiO2复合薄膜改善可见光下有机污染物的光催化降解

摘要 为了有效克服TiO2在实际应用中的固有缺陷，包括量子效率低、禁带宽度大等缺陷，采用溶胶-凝胶法制备了具有高光催化性能的B/Co/Fe三掺杂TiO2/SiO2复合薄膜。通过XRD、FE-SEM、EDS、DTA-TG、BET、DRS和PL表征了催化剂的理化性质。结果表明，SiO2的复合和TiO2中B/Co/Fe离子的掺杂可以有效抑制锐钛矿向金红石的相变和高退火温度下晶粒的生长。SiO2 的复合可以提高样品的比表面积（82.6 增加到 335.8 m2/g）并提供更多的吸附位点。B/Co/Fe 三掺杂可以在 TiO2 的带隙中形成杂质能级，从而缩短带隙能量 (2. 54 ev)。B/Co/Fe三掺杂TiO2/SiO2薄膜可以提高界面转移率，降低电子和空穴的复合率。在紫外或可见光照射下，以两种污染物作为光降解目标，评估了 B/Co/Fe 三掺杂 TiO2/SiO2 薄膜的光催化活性。结果表明，与纯二氧化钛相比，薄膜表现出更优异的光催化活性。已经提出了合理的光催化降解机制。结果表明，与纯二氧化钛相比，薄膜表现出更优异的光催化活性。已经提出了合理的光催化降解机制。结果表明，与纯二氧化钛相比，薄膜表现出更优异的光催化活性。已经提出了合理的光催化降解机制。