Photocatalytic Performances of Dip-Coated Ag Doped TiO₂ Thin Films

• Autorzy: Alharbi M. , Althubyani H. , Alarfaj Esam , Dastan Davoud , Timoumi Abdelmajid , Tao Lin , Albetran Hani , Ţălu Ştefan

Identyfikatory

DOI

10.24425/amm.2024.150919

• Języki publikacji: EN

Abstrakty

EN

In this study, dip coating technique is used to deposit titanium dioxide (TiO₂) and silver (Ag)-doped-TiO₂ nanocomposite thin films on glass substrates. The obtained films are typified using different characterization techniques such as X-ray diffraction (XRD), and UV-Vis-NIR spectroscopy. Films are also tested for environmental applications related to color degradation (methylene blue). The XRD analysis confirms that the prepared nanostructures are the anatase phase of titania. The crystal sizes of annealed Ag-TiO₂ as well as TiO₂ thin films have been summarized across the XRD pattern and are approximately 29±1 and 23±1 nm, respectively. Additionally, the energy bandgaps of the photocatalysts (Pure-TiO₂ and Ag-TiO₂) are found to be around 3.3 and 3.02 eV, respectively. The photocatalytic activity of TiO₂ and Ag-doped TiO₂ nanocomposite thin films is tested in the same initial concentrations of methylene blue in water (3×10^-5 M). The photodegradation behavior of Ag-TiO₂ (3% by weight) shows a good improvement against pure TiO₂ for the concentrations of methylene blue in the pseudo-first order Langmuir-Hinshelwood (LH) model of the kinetics reaction. The global pseudo-first order reaction constant, k, for these concentrations goes from less than 1.4×10^-3 min^-1 for TiO₂ films to 5.4×10^-3 min^-1 for Ag-TiO₂ films. This improvement is due to the incorporation of Ag, which increases the lifetime of the electrons and the separated holes, that decreases the rate of recombination (electron-hole) and which also generates reactive oxygen species. These features open the route to future applications for photocatalytic wastewater treatment and environmental remediation under solar irradiation.

Słowa kluczowe

EN

dip coating; methylene blue; photocatalytic; photodegradation; TiO2

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2024
• Tom: Vol. 69, iss. 3
• Strony: 987--996
• Opis fizyczny: Bibliogr. 84 poz., rys., tab., wzory

Twórcy

autor

Alharbi M.

• Qassim University, Department of Physics, College of Sciences, Buraydah Almolaydah, Buraydah, Saudi Arabia

autor

Althubyani H.

• Umm AL-Qura University, Faculty of Applied Science, Physics Department, Makkah, P.O. Box 715, Saudi Arabia

autor

Alarfaj Esam

• Qassim University, Department of Physics, College of Sciences, Buraydah Almolaydah, Buraydah, Saudi Arabia

• https://orcid.org/0000-0001-6928-1101

autor

Dastan Davoud

• Cornell University, Department of Materials Science and Engineering, Ithaca, New York, 14850, USA

• https://orcid.org/0000-0002-4124-5763

autor

Timoumi Abdelmajid

• Umm AL-Qura University, Faculty of Applied Science, Physics Department, Makkah, P.O. Box 715, Saudi Arabia

• https://orcid.org/0000-0002-7687-5060

autor

Tao Lin

• University of Science and Technology Liaoning, School of Chemical Engineering, Anshan 114051, China

• https://orcid.org/0000-0002-3268-7009

autor

Albetran Hani

• Imam Abdulrahman Bin Faisal University, Department of Physics, College of Science, P.O. Box 1982, Dammam 31441, Saudi Arabia

• https://orcid.org/0000-0003-1083-7018

autor

Ţălu Ştefan

• Technical University of Cluj-Napoca, The Directorate of Research, Development and Innovation Management (DMCDI), Constantin Daicoviciu St., no. 15, Cluj-Napoca, 400020, Cluj county, Romania

• https://orcid.org/0000-0003-1311-7657

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