期刊
CATALYSTS
卷 10, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/catal10090964
关键词
titanium dioxide; photocatalytic degradation; caffeine; ultraviolet C; photocatalysis
资金
- Thailand Science Research and Innovation (TSRI) [MRG6280178]
- Office of The Higher Education Commission [MRG6280178]
- Research Strengthening Project of the Faculty of Engineering, King Mongkut's University of Technology Thonburi
- 55th Anniversary Commemorative Fund of King Mongkut's University of Technology Thonburi (KMUTT)
This work presents the development of titanium dioxide (TiO2) film immobilized on circular glass sheets for photocatalytic degradation of caffeine under ultraviolet C (UVC) irradiation. TiO2 was synthesized through the ultrasonic-assisted sol-gel method and immobilized on circular glass sheets by the doctor blade technique. Polyvinylpyrrolidone (PVP) was used to mix with the TiO2 precursor solution to enhance film adhesion on the glass surface. TiO2 film was mainly composed of anatase phase with a small amount of rutile phase. Caffeine removal was found to increase with increasing irradiation time. Caffeine (20 mg/L) in the synthetic wastewater could not be detected after 3 h of UVC irradiation. The reaction rate of caffeine degradation followed the pseudo-first-order model. The concentrated caffeine solutions required a longer irradiation time for degradation. The used TiO2-coated glass sheets could be easily separated from the treated wastewater and reusable. The caffeine removal efficiency of TiO2-coated glass sheets in each cycle maintained a high level (similar to 100%) during fifteen consecutive cycles.
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