N. Kaneva, A. Bojinova, R. Mladenova, Hristo Kolev, Bozhidar Stefanov
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引用次数: 0
摘要
该研究证明了从含有异丙醇钛 (IV)、单乙醇胺和 2-甲氧基乙醇的溶液中通过浸涂产生的二氧化钛薄膜的光催化活性。在紫外线照射下,水相中不同浓度(10-2 - 10-4 M)的 Ag (I) 离子经过光固化,随后薄膜表面被Ag 助催化剂层修饰。扫描电子显微镜 (SEM)、X 射线光电子能谱 (XPS)、紫外-可见 (UV) 光谱和电子顺磁共振 (EPR) 技术用于表征样品的物理特性。结果表明,共催化剂的改性对薄膜的厚度和孔隙率没有影响。此外,研究还表明,改性后的二氧化钛薄膜具有更高的光催化活性。使用的所有表征方法都显示了表面结合的 Ag (I) 物种和金属银纳米团簇的形成。通过测量紫外线照射下亚甲蓝(MB)染料的降解情况,评估了制备的和银修饰的二氧化钛薄膜的光催化活性,并研究了光固化过程中银前驱体浓度的影响。催化活性最高的是 Ag (I) 浓度为 10-2 M 的改性薄膜。MB 光降解速率常数从高到低依次为 TiO2 < TiO2 /Ag, 10-4 < TiO2 /Ag, 10-3 < TiO2 /Ag, 10-2。
SYNTHESIS OF Ag-MODIFIED TiO2 SOL-GEL FILMS AND ITS APPLICATION AS PHOTOCATALYSTS FOR METHYLENE BLUE DEGRADATION
In the study, the photocatalytic activity of TiO2 films that are created by dip-coating from a sol that contained titanium (IV) isopropoxide, monoethanolamine, and 2-methoxyethanol is demonstrated. Through photo-fixation of Ag (I) ions with varied concentration (10-2 - 10-4 M) in the water phase under UV illumination, the films are subsequently surface-modified with Ag co-catalyst layers. Scanning Electron Microscopy (SEM), X-Ray Photoelectron Spectroscopy (XPS), Ultraviolet-Visible (UV) Spectroscopy, and Electron Paramagnetic Resonance (EPR) techniques are used to physically characterize the samples. Results reveal that the modification of the co-catalyst had no impact on the thickness and porosity of the films. In addition, the study show that the modified TiO2 films had increased photocatalytic activity. All the characterization methods used have shown the formationof surface - bound Ag (I) species and metallic silver nanoclusters. By measuring the Methylene Blue (MB) dye degradation under UV light illumination, as - prepared and Ag -modified TiO2 films are evaluated for their photocatalytic activity, and the impact of the silver precursor concentration during photo-fixation is investigated.The highest catalytic activity is seen for films that have been modified at a concentration of Ag (I) of 10-2 M. Ordered from highest to lowest, the MB photodegradation rate constants are TiO2 < TiO2 /Ag, 10-4 < TiO2 /Ag, 10-3 < TiO2 / Ag, 10-2.