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Enhanced photocatalytic degradation of organic dyes using Ce–doped TiO2 thin films

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Abstract

We fabricated and investigated the Ce–doped TiO2 (Ce–TiO2, 1.0 wt%) photocatalysts thin film using sol–gel and spin coating methods, which can be used to effectively treat toxic organic substances from aqueous environments. The thin films were characterized by X–ray diffraction, scanning electron microscopy, energy–dispersive X–ray spectroscopy, Raman spectroscopy, photoluminescent spectroscopy, and ultraviolet–visible spectrophotometer. In terms of quantitative analysis, the Ce–TiO2 thin film exhibited a lower band gap of 3.21 eV compared to the undoped TiO2 film with a band gap of 3.38 eV. These results suggest an improved photocatalytic efficiency, which was further confirmed by experimental findings related to wastewater treatment. The photocatalytic behavior under UV irradiation was studied for the degradation of methylene blue, rhodamine B, methyl violet, and tetracycline (TC). In comparison to the pure TiO2 thin film, the Ce–TiO2 thin film photocatalyst showed a significantly larger photocatalytic activity. The largest removal efficiency of Ce–TiO2 photocatalytic thin film was observed on the degradation of TC with an efficiency of 86.42% after 120 min of exposure, suggesting potential applications in treating water pollution caused by hazardous chemicals or other pollutants.

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  • Sol–gel and spin coating techniques were employed to produce Ce–TiO2 and TiO2 thin films.

  • Research delved into the degradation of organic dyes through Ce–doped TiO2 and TiO2 thin films.

  • Enhanced photocatalytic efficiency of Ce–TiO2 over pure TiO2 was observed under UV irradiation.

  • Ce–TiO2 exhibited remarkable 86.42% tetracycline reduction within 120 min.

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Acknowledgements

This work was supported by the Vietnam Academy of Science and Technology (VAST) under grant number TĐANQP.02/23–25.

Author contributions

TLNV: conceived ideas, completed experiments, and wrote the article. TTD, HVB, and DCN: assisted in completing experiments. ATD, VHN, and DLN: revised the article for language issues. THN: funded experiments. HTN: discussed the results and revised manuscript.

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Authors and Affiliations

  1. Faculty of Materials Science and Engineering, Phenikaa University, Hanoi, 12116, Viet Nam

    Thi Le Na Vo, Anh Tuan Duong, Van Hao Bui & Viet Huong Nguyen

  2. Faculty of Electrical and Electronic Engineering, Phenikaa University, Hanoi, 12116, Viet Nam

    Thi Thuy Dao & Huu Tuan Nguyen

  3. Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi, 13313, Viet Nam

    Anh Tuan Duong & Huu Tuan Nguyen

  4. Faculty of Engineering Physics and Nanotechnology, VNU University of Engineering and Technology, VNU in Hanoi, No. 144 Xuan Thuy Road, Cau Giay District, Hanoi, 10000, Vietnam

    Dinh Lam Nguyen & Duc Cuong Nguyen

  5. Center for High Technology Development, Vietnam Academy of Science and Technology (VAST) 18 Hoang Quoc Viet, Cau Giay, Ha Noi, 10000, Vietnam

    Tuan Hong Nguyen

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  1. Thi Le Na Vo
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Vo, T.L.N., Dao, T.T., Duong, A.T. et al. Enhanced photocatalytic degradation of organic dyes using Ce–doped TiO2 thin films. J Sol-Gel Sci Technol 108, 423–434 (2023). https://doi.org/10.1007/s10971-023-06203-w

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