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DOI: https://doi.org/10.4491/eer.2021.209
Visible-light photocatalysis over MIL-53(Fe) for VOC removal and viral inactivation in air
Soo Yeon Park1, Jiwon Seo2, Taewan Kim1, Joohyun Kim1, Joon-Young Choi3, and Changha Lee1
1School of Chemical and Biological Engineering, Institute of Chemical Process (ICP), and Institute of Engineering Research, Seoul National University, Seoul 08826, Republic of Korea
2Measurement & Analysis Center, Environmental Infrastructure Research Department, National Institute of Environmental Research, Incheon 22689, Republic of Korea
3Hyorim Industries Inc., Gyeonggi-do 13517, Republic of Korea
Corresponding Author: Changha Lee ,Tel: +82-2-880-8630, Fax: +82-2-888-7259, Email: leechangha@snu.ac.kr
Received: April 27, 2021;  Accepted: July 8, 2021.
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MIL-53(Fe), synthesized by a one-step hydrothermal method, was investigated for the removal of toluene and inactivation of bacteriophage X 174 in air under visible light illumination. MIL-53(Fe) exhibited superior photochemical activity to other metal organic frameworks synthesized by the same method with different metal precursors. Analytical methods of diffuse reflectance spectroscopy, BET specific surface area analysis, SEM-EDS, FT-IR analysis, XRD, Mott-Schottky analysis, and XPS were used to characterize MIL-53(Fe). The illuminated MIL-53(Fe) removed input toluene (C0 = 3.59 g/m3) by 66% in 6 h by adsorption and subsequent photocatalytic oxidation. High humidity and temperature, and the anoxic condition inhibited the toluene removal. MIL-53(Fe) showed sustainable toluene removal for five consecutive runs, even though the photocatalytic activity slightly decreased. Meanwhile, the illuminated MIL-53(Fe) also resulted in the inactivation of X 174 suspended in air, achieving approximately 3 log inactivation in 60 min (N0 = ~106 PFU/mL air). Similar to toluene removal, the presence of oxygen and low humidity were beneficial for viral inactivation. The photo-generated holes are believed to be responsible for the organic degradation and viral inactivation by the illuminated MIL-53(Fe).
Keywords: Metal-organic frameworks | Photocatalysis | Visible-light photocatalyst | MIL-53(Fe) | Virus inactivation | Volatile organic compounds
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