Enhanced Photocatalytic Degradation of Caffeine Using Titanium Dioxide Photocatalyst Immobilized on Circular Glass Sheets under Ultraviolet C Irradiation
This work presents the development of titanium dioxide (TiO<sub>2</sub>) film immobilized on circular glass sheets for photocatalytic degradation of caffeine under ultraviolet C (UVC) irradiation. TiO<sub>2</sub> was synthesized through the ultrasonic-assisted sol–gel method...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-08-01
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| Series: | Catalysts |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4344/10/9/964 |
| Summary: | This work presents the development of titanium dioxide (TiO<sub>2</sub>) film immobilized on circular glass sheets for photocatalytic degradation of caffeine under ultraviolet C (UVC) irradiation. TiO<sub>2</sub> 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 TiO<sub>2</sub> precursor solution to enhance film adhesion on the glass surface. TiO<sub>2</sub> 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 TiO<sub>2</sub>-coated glass sheets could be easily separated from the treated wastewater and reusable. The caffeine removal efficiency of TiO<sub>2</sub>-coated glass sheets in each cycle maintained a high level (~100%) during fifteen consecutive cycles. |
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| ISSN: | 2073-4344 |