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Article

Fabrication of a Cu2O-Au-TiO2 Heterostructure with Improved Photocatalytic Performance for the Abatement of Hazardous Toluene and α-Pinene Vapors

1
SEEDPARTONE Inc., Seoul 07599, Korea
2
Department of Environmental Engineering, Catholic University of Pusan, Busan 46252, Korea
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(12), 1434; https://doi.org/10.3390/catal10121434
Received: 15 November 2020 / Revised: 4 December 2020 / Accepted: 6 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Recent Advances in TiO2 Photocatalysts)
In the current research, a Cu2O-Au-TiO2 heterostructure was fabricated via a step-wise photodeposition route to determine its possible application in the photocatalytic oxidation of hazardous vapors. The results of electron microscopy and X-ray photoelectron spectroscopy confirm the successful fabrication of the Cu2O-Au-TiO2 heterostructure. Strong absorption in the visible region, along with a slight red-shift in the absorption edge, was observed in the UV–vis diffuse reflectance spectrum of Cu2O-Au-TiO2 composite, which implies that the composite can generate a greater number of photoexcited charges necessary for photocatalytic reaction. Toluene and α-pinene, as common gas contaminants in the indoor atmosphere, were employed to assess the photooxidation efficiency of the Cu2O-Au-TiO2 composite. Importantly, photocatalytic activity results indicate that the Cu2O-Au-TiO2 composite showed excellent photodegradation performance compared to pure TiO2 and Cu2O-TiO2 and Au-TiO2, where photocatalytic efficiency was approximately 92.9% and 99.9% for toluene and α-pinene, respectively, under standard daylight illumination. The increased light-harvesting capacity and boosted separation efficiency of electron-hole pairs were mainly accountable for improved degradation performance of the Cu2O-Au-TiO2 composite. In addition, the degradation efficiencies for toluene and α-pinene by the Cu2O-Au-TiO2 composite were also examined under three different light sources: 0.32 W white, blue and violet LEDs. The findings of this work suggested a great promise of effective photooxidation of gas pollutants by the Cu2O-Au-TiO2 composite. View Full-Text
Keywords: TiO2; Cu2O; plasmonic effect; heterojunction; vapor degradation; environmental remediation TiO2; Cu2O; plasmonic effect; heterojunction; vapor degradation; environmental remediation
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MDPI and ACS Style

Lee, J.Y.; Choi, J.-H. Fabrication of a Cu2O-Au-TiO2 Heterostructure with Improved Photocatalytic Performance for the Abatement of Hazardous Toluene and α-Pinene Vapors. Catalysts 2020, 10, 1434. https://doi.org/10.3390/catal10121434

AMA Style

Lee JY, Choi J-H. Fabrication of a Cu2O-Au-TiO2 Heterostructure with Improved Photocatalytic Performance for the Abatement of Hazardous Toluene and α-Pinene Vapors. Catalysts. 2020; 10(12):1434. https://doi.org/10.3390/catal10121434

Chicago/Turabian Style

Lee, Joon Y., and Jeong-Hak Choi. 2020. "Fabrication of a Cu2O-Au-TiO2 Heterostructure with Improved Photocatalytic Performance for the Abatement of Hazardous Toluene and α-Pinene Vapors" Catalysts 10, no. 12: 1434. https://doi.org/10.3390/catal10121434

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