The Y, F, and Ag tridoped TiO₂/SnO₂ composite nanocrystalline film (YFAg–TS) with prominent photocatalytic performance was prepared by the modified sol–gel method and was characterized by utilizing X-ray diffraction (XRD), differential thermal and thermogravimetric (DTA–TG) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) method, ultraviolet–visible diffuse reflectance spectroscopy (UV–vis DRS), and photoluminescence (PL). The XRD and DTA–TG results expose that the YFAg–TS catalyst is a mixed phase consisting of anatase, rutile, and chlorargyrite, which is beneficial to improving the photocatalytic performance of TiO₂. The SEM, TEM, and BET results disclose that the YFAg–TS film has smaller nanoparticles, higher specific surface area, and narrower pore size compared with pure TiO₂ film. The XRD and TEM results exhibit that a part of yttrium can enter the TiO₂ lattice to induce lattice distortion. The XPS results confirm the presence of Y³⁺ state in the YFAg–TS sample, and Y³⁺ ions can act as the trapping site of electrons to expedite the separation of electrons and holes. The UV–vis DRS results reveal that the YFAg–TS film has an obvious absorption edge shift and a narrower bandgap (2.70 eV) compared with pure TiO₂ film. The PL results show that the YFAg–TS film has the highest photogenerated electrons and holes separation efficiency and charges transfer efficiency among all samples. The photocatalytic activity of the YFAg–TS was assessed by monitoring the degradation of methyl green and formaldehyde solution. The results manifest that the YFAg–TS film has high stability and excellent photocatalytic performance. The possible synergistic photocatalytic mechanism of YFAg–TS films has been discussed in this paper.

采用改进的溶胶-凝胶法制备了具有突出光催化性能的Y、F、Ag三掺杂TiO ₂ /SnO ₂复合纳米晶薄膜（YFAg-TS），并利用X射线衍射（XRD）、差热和热重 (DTA-TG) 分析、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、X 射线光电子能谱 (XPS)、Brunauer-Emmett-Teller (BET) 方法、紫外-可见漫反射光谱 (UV- vis DRS）和光致发光（PL）。XRD和DTA-TG结果表明YFAg-TS催化剂是锐钛矿、金红石和氯银矿的混合相，有利于提高TiO _{2的光催化性能。}. _{SEM、TEM和BET结果表明，与纯TiO 2}薄膜相比，YFAg-TS薄膜具有更小的纳米颗粒、更高的比表面积和更窄的孔径。XRD和TEM结果表明，一部分钇可以进入TiO ₂晶格引起晶格畸变。XPS结果证实YFAg-TS样品中存在Y ³⁺态，Y ³⁺离子可以作为电子的俘获位点，加速电子和空穴的分离。_{UV-vis DRS结果表明，与纯TiO 2}相比，YFAg-TS薄膜具有明显的吸收边偏移和更窄的带隙（2.70 eV）。电影。PL结果表明YFAg-TS薄膜在所有样品中具有最高的光生电子和空穴分离效率和电荷转移效率。通过监测甲基绿和甲醛溶液的降解来评估 YFAg-TS 的光催化活性。结果表明，YFAg-TS薄膜具有高稳定性和优异的光催化性能。本文讨论了 YFAg-TS 薄膜可能的协同光催化机理。