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Ceramic tiles coated with Zr-Ag co-doped TiO2 thin film for indoor air purifying and antimicrobial applications |
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| Authors: | Kamonsasarat Taechasirivichai Siriluk Chiarakorn Chamorn Chawengkijwanich Thirawudh Pongprayoon Surawut Chuangchote |
| Affiliation: | 1. Department of Tool and Materials Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok, Thailand The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok, Thailand Center of Excellence on Energy Technology and Environment, PERDO, Bangkok, Thailand;2. Environmental Technology Program, School of Energy, Environment and Materials, King Mongkut's University of Technology Thonburi, Bangkok, Thailand;3. National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, Thailand;4. Center of Eco-Materials and Cleaner Technology, Department of Chemical Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Bangkok, Thailand;5. Department of Tool and Materials Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Bangkok, Thailand |
| Abstract: | In this study, Zr-Ag co-doped TiO2 (ZAT) photocatalyst films having varied numbers of layers (1, 2, 3, and 4) have been developed to coat on ceramic tile substrates by sol-gel spin coating technique. The specimens were tested to determine antibacterial activity against Escherichia coli and the capability to degrade gaseous formaldehyde under visible light. X-ray diffraction, ultraviolet and visible absorption spectroscopy, water contact angle, and scanning electron microscopy were applied to characterize the structural and morphological properties of the samples. The photocatalytic reactivity of the nanocomposite films was investigated by the decolorization of methylene blue (MB) dye under visible light irradiation. The results showed that the two-layer ZAT photocatalyst film on ceramic tile exhibited the highest photocatalytic decolorization of MB, with 60.36% efficiency. The ZAT tile had formaldehyde degradation efficiency up to 32.74% within only 6 h under visible light irradiation, higher than that of the bare ceramic tile (4.90%). Additionally, the ZAT thin films could enhance anti-E. coli activity and could be capable of degrading air pollution. |
| Keywords: | antibacterial activity ceramic tile formaldehyde photocatalysis titanium dioxide zirconium-silver co-dope |