Enhanced Photocatalytic Degradation of Caffeine Using Titanium Dioxide Photocatalyst Immobilized on Circular Glass Sheets under Ultraviolet C Irradiation

Catalysts

Patiparn Punyapalakul¹  Patiya Kemacheevakul²  Rattana Muangmora²  Surawut Chuangchote³ 

[1] Department of Environmental Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;Department of Environmental Engineering, Faculty of Engineering, King Mongkut 2019s University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Bangkok 10140, Thailand;Research Center of Advanced Materials for Energy and Environmental Technology (MEET), King Mongkut’s University of Technology Thonburi, 126 Prachauthit Rd., Bangmod, Bangkok 10140, Thailand;

关键词: titanium dioxide;    photocatalytic degradation;    caffeine;    ultraviolet C;    photocatalysis;   

DOI  :  10.3390/catal10090964

来源: DOAJ

【 摘 要 】

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 (~100%) during fifteen consecutive cycles.

【 授权许可】

Unknown