Characterization and photocatalytic activity of different molar ratios of TiO2 thin films prepared by Sol-Gel process

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Main Group Chemistry Pub Date : 2022-03-20 DOI:10.3233/mgc-210140

A. Attaf, R. Messemeche, H. Saidi, B. Youcef, M. Aida, O. Benkhetta

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Abstract

Photocatalytic application has been of large interest due to its new technology for organic pollution. Among the photocatalyst, titanium dioxide thin film is known as a photocatalyst for the elimination of organic pollutants. In this research, the structural and optical properties of TiO2 thin films prepared on glass substrates were studied, using a sol-gel (spin coating) technique. TiO2 thin films were deposited with molar ratio y between [TTIP] and [AcAc] concentration, which varied from 0.5 to 2. Photocatalytic properties of TiO2 thin films are studied by using sunlight and photodegradation of methylene blue as a water pollutant evaluated until the photocatalytic process enhances with the molar ratio. Absorbance spectra were measured using a spectrophotometer. Test results showed that the photocatalytic sunlight /TiO2 thin film is a promising method for treating wastewater. The quantity of acetylacetone in the precursor solution had no significant effect on the optical and structural properties of the TiO2 thin films. Films consisted of the anatase phase, with a band gap in the range of 3.38–3.51 eV and thickness in the range of 534–618 nm. However, the molar ratio effect on photocatalytic preperties, the best photodegradation rate reaches to 94% in y = 0.66 at t = 180 min.

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溶胶-凝胶法制备不同摩尔比TiO2薄膜的表征及其光催化活性

光催化处理有机污染的新技术引起了人们的广泛关注。在光催化剂中，二氧化钛薄膜被称为消除有机污染物的光催化剂。在本研究中，采用溶胶-凝胶(自旋镀膜)技术研究了在玻璃衬底上制备的TiO2薄膜的结构和光学性能。在[TTIP]与[AcAc]的摩尔比为0.5 ~ 2的条件下，制备了TiO2薄膜。利用阳光和光降解亚甲基蓝作为水污染物来研究TiO2薄膜的光催化性能，直到光催化过程随着摩尔比的增加而增强。用分光光度计测量吸光度。试验结果表明，光催化太阳光/TiO2薄膜是一种很有前途的废水处理方法。前驱体溶液中乙酰丙酮的含量对TiO2薄膜的光学性能和结构性能没有显著影响。薄膜由锐钛矿相组成，带隙为3.38 ~ 3.51 eV，厚度为534 ~ 618 nm。然而，摩尔比对光催化性能有影响，在y = 0.66、t = 180 min时，光降解率达到94%。

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来源期刊

Main Group Chemistry 化学-化学综合

CiteScore

2.00

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Main Group Chemistry is intended to be a primary resource for all chemistry, engineering, biological, and materials researchers in both academia and in industry with an interest in the elements from the groups 1, 2, 12–18, lanthanides and actinides. The journal is committed to maintaining a high standard for its publications. This will be ensured by a rigorous peer-review process with most articles being reviewed by at least one editorial board member. Additionally, all manuscripts will be proofread and corrected by a dedicated copy editor located at the University of Kentucky.