Journal
CATALYSTS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/catal10050545
Keywords
gallium oxide; photocatalytic degradation; volatile organic compounds; ultraviolet light; aromatic compound; nonaromatic compound
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Funding
- National Research Foundation of Korea (NRF) through the Basic Science Research Program [2017R1A2B4012278]
- Center for Advanced Soft-Electronics - Ministry of Science, ICT and Future Planning through the Global Frontier Project [CASE-2011-0031638]
- National Research Foundation of Korea [2011-0031638, 2017R1A2B4012278] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga(2)O(3)and anatase TiO(2)nanostructures under ultraviolet-C irradiation. These Ga(2)O(3)and TiO(2)photocatalysts are characterized using a field emission scanning electron microscope, a powder X-ray diffraction system, the Brunauer-Emmett-Teller method, and a Fourier transform infrared spectrometer. The Ga(2)O(3)shows a higher reaction rate constant (k, min(-1)) than TiO(2)by a factor of 7.1 for toluene, 8.1 for styrene, 3.1 for formaldehyde, and 2.0 for acetaldehyde. The results demonstrate that the photocatalytic activity ratio of the Ga(2)O(3)over the TiO(2)becomes more prominent toward the aromatic compounds compared with the nonaromatic compounds. Highly energetic photo-generated carriers on the conduction/valence band-edge of the Ga2O3, in comparison with that of the TiO2, result in superior photocatalytic activity, in particular on aromatic volatile organic compounds (VOCs) with a high bond dissociation energy.
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