For the sake of improving the photocatalytic performance of TiO2, we prepared the B/Ag/Fe tridoped TiO2 films on common glass and stone substrates by the sol–gel method. In this work, the optical absorption, recombination of photogenerated electrons (e−) and holes (h[Formula: see text]), crystal types, thermal stability, composition, specific surface area and photocatalytic activity of the modified TiO2 films were investigated. The results indicated that B/Ag/Fe tridoping not only enhanced the absorption of visible light by TiO2, but inhibited the recombination of electron–hole (e−/h[Formula: see text]) pairs. The tridoping also promoted the formation of anatase and prevented the transformation of anatase to rutile at high temperature. The composite TiO2 has a large specific surface area, about three times that of pure TiO2. The photocatalytic activity of the TiO2 films were evaluated by methyl green (MG) and formaldehyde degradation. In all samples, the B/Ag/Fe tridoped TiO2 film exhibited the highest degradation rate of MG under both ultraviolet and visible light irradiation. The improvement of photocatalytic performance of TiO2 films is due to the synergistic effect of the B/Ag/Fe tridoping, which enhances the absorption of visible light and prolongs the lifetime of e−/h[Formula: see text] pairs and facilitates transfer of interface charge.

中文翻译：

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增强可见光光催化性能的不同基材上的 TiO2 复合膜

为了提高二氧化钛的光催化性能2, 我们制备了 B/Ag/Fe 三掺杂 TiO2溶胶-凝胶法在普通玻璃和石材基材上的薄膜。在这项工作中，光生电子（e-) 和空穴 (h[公式: 见正文])、改性二氧化钛的晶体类型、热稳定性、组成、比表面积和光催化活性2电影进行了调查。结果表明，B/Ag/Fe三掺杂不仅增强了TiO对可见光的吸收2，但抑制了电子-空穴的复合（e-/h[公式：见正文]) 对。三掺杂还促进了锐钛矿的形成，并阻止了锐钛矿在高温下转变为金红石。复合二氧化钛2比表面积大，约为纯二氧化钛的三倍2. TiO的光催化活性2通过甲基绿 (MG) 和甲醛降解对薄膜进行评估。在所有样品中，B/Ag/Fe 三掺杂 TiO2薄膜在紫外光和可见光照射下均表现出最高的MG降解率。TiO光催化性能的提高2薄膜是由于B / Ag / Fe三掺杂的协同作用，增强了对可见光的吸收并延长了e的寿命-/h[公式：见正文]配对并促进界面电荷的转移。