Study on photocatalytic and antibacterial ability of TiO2 and TiO2-SiO2 coatings

Kieu Do Trung  Kien; Do Quang  Minh; Huynh Ngoc  Minh; Nguyen Vu Uyen  Nhi

doi:10.6180/jase.202503_28(3).0004

Study on photocatalytic and antibacterial ability of TiO2 and TiO2-SiO2 coatings

Kieu Do Trung Kien^1,2This email address is being protected from spambots. You need JavaScript enabled to view it. , Do Quang Minh^1,2, Huynh Ngoc Minh^1,2, and Nguyen Vu Uyen Nhi^1,2

¹Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam

²Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Vietnam

Received: February 7, 2024
Accepted: April 1, 2024
Publication Date: May 4, 2024

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202503_28(3).0004

Materials exhibiting photocatalytic properties have garnered considerable attention for diverse applications, including degrading toxic organic compounds, disinfection, and developing self-cleaning surfaces. This study focuses on the synthesis of coatings based on TiO₂ and TiO₂-SiO₂, accomplished through the sol–gel method using Tetra-n-butyl ortho titanate and Tetraethyl orthosilicate precursors, followed by calcination at 500^◦C. The phase compositions of the resulting coatings were assessed using Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The band gap energy was quantified through UV-Vis spectroscopy. The photocatalytic efficacy was examined by assessing the inhibition of Escherichia coli bacteria and the decomposition of the methylene blue solution. The adhesive capability of the coating to the ceramic tile substrate was evaluated via scanning electron microscopy. The outcomes reveal that the primary phase components of the coatings consist of anatase and rutile. The introduction of SiO₂ in conjunction with TiO₂ demonstrates a mitigating effect on the photocatalytic performance and organic matter decomposition compared to pure TiO₂. Nevertheless, this reduction is marginal, and SiO2 positively influences enhancing the adhesion of the TiO₂ coating to the ceramic substrate material.

Keywords: TiO2; TiO2-SiO2; photocatalyst; antimicrobial application

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