Photonic crystal-assisted sub-bandgap photocatalysis via triplet-triplet annihilation upconversion for the degradation of environmental organic pollutants

This study explores novel approaches to enhance photocatalysis efficiency by introducing a photonic crystal (PC)-enhanced, multi-layered sub-bandgap photocatalytic reactor. The design aims to effectively utilize sub-bandgap photons that might otherwise go unused. The device consists of three types o...

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Bibliographic Details
Published in:Journal of hazardous materials 2024-09, Vol.477, p.135208, Article 135208
Main Authors: Cho, Haein, Seo, Sung Eun, Kwon, Oh Seok, Kim, Hyoung-il
Format: Article
Language:English
Subjects:
4-chlorophenol
bisphenol A
Environmental remediation
Hydroxyl radical (•OH) generation
hydroxyl radicals
irradiation
light
methylene blue
photocatalysis
photocatalysts
Photocatalytic organic pollutant degradation
Photonic crystal
photons
polymers
remediation
TTA-UC
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Summary:This study explores novel approaches to enhance photocatalysis efficiency by introducing a photonic crystal (PC)-enhanced, multi-layered sub-bandgap photocatalytic reactor. The design aims to effectively utilize sub-bandgap photons that might otherwise go unused. The device consists of three types of layers: (1) two polymeric triplet-triplet annihilation upconversion (TTA-UC) layers converting low-energy green photons (λEx = 532 nm, 2.33 eV) to high-energy blue photons (λEm = 425 nm, 2.92 eV), (2) a platinum-decorated WO3 layer (Eg = 2.8 eV) serving as a visible-light photocatalyst, and (3) a PC layer optimizing both TTA-UC and photocatalysis. The integration of the PC layer resulted in a 1.9-fold increase in UC emission and a 7.9-fold enhancement in hydroxyl radical (•OH) generation, achieved under low-intensity sub-bandgap irradiation (17.6 mW cm–2). Consequently, the combined layered structure of TTA/Pt-WO3/TTA/PC achieved a remarkable 38.8-fold improvement in •OH production, leading to outstanding degradation capability for various organic pollutants (e.g., 4-chlorophenol, bisphenol A, and methylene blue). This multi-layered sub-bandgap photocatalytic structure, which uniquely combines TTA-UC and PC layers, offers valuable insights into designing efficient photocatalytic systems for future solar-driven environmental remediation. [Display omitted] •Facile PC fabrication enhances TTA-UC optical properties.•PC improves both TTA-UC emission and photocatalytic •OH generation.•TTA/Pt-WO3/TTA/PC multi-layered system effectively decomposes Pollutants.
ISSN:0304-3894
1873-3336
1873-3336
DOI:10.1016/j.jhazmat.2024.135208