Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds
The photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga<sub>2</sub>O<sub>3</sub> and anatase TiO<sub>2</sub> nanostructures under ultraviolet-C irradiation. These Ga<sub>2</sub>O<sub>3&l...
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MDPI AG
2020-05-01
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| author | Tae Hee Yoo Heejoong Ryou In Gyu Lee Junsang Cho Byung Jin Cho Wan Sik Hwang |
| author_facet | Tae Hee Yoo Heejoong Ryou In Gyu Lee Junsang Cho Byung Jin Cho Wan Sik Hwang |
| author_sort | Tae Hee Yoo |
| collection | DOAJ |
| description | The photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga<sub>2</sub>O<sub>3</sub> and anatase TiO<sub>2</sub> nanostructures under ultraviolet-C irradiation. These Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> 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<sub>2</sub>O<sub>3</sub> shows a higher reaction rate constant (<i>k</i>, min<sup>−1</sup>) than TiO<sub>2</sub> 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<sub>2</sub>O<sub>3</sub> over the TiO<sub>2</sub> 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 Ga<sub>2</sub>O<sub>3</sub>, in comparison with that of the TiO<sub>2</sub>, result in superior photocatalytic activity, in particular on aromatic volatile organic compounds (VOCs) with a high bond dissociation energy. |
| first_indexed | 2024-03-10T19:50:13Z |
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| id | doaj.art-0e900194f5ac4a81a88d0172c08b6b83 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T19:50:13Z |
| publishDate | 2020-05-01 |
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| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-0e900194f5ac4a81a88d0172c08b6b832023-11-20T00:24:09ZengMDPI AGCatalysts2073-43442020-05-0110554510.3390/catal10050545Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic CompoundsTae Hee Yoo0Heejoong Ryou1In Gyu Lee2Junsang Cho3Byung Jin Cho4Wan Sik Hwang5Department of Materials Engineering, Korea Aerospace University, Goyang 10540, KoreaDepartment of Materials Engineering, Korea Aerospace University, Goyang 10540, KoreaDepartment of Materials Engineering, Korea Aerospace University, Goyang 10540, KoreaRadiation Laboratory, University of Notre Dame, Notre Dame, IN 46556, USASchool of Electrical Engineering, Korea Advanced Institute of Science and Technology(KAIST), Daejeon 34141, KoreaDepartment of Materials Engineering, Korea Aerospace University, Goyang 10540, KoreaThe photocatalytic degradation of formaldehyde, acetaldehyde, toluene, and styrene are compared using monoclinic Ga<sub>2</sub>O<sub>3</sub> and anatase TiO<sub>2</sub> nanostructures under ultraviolet-C irradiation. These Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> 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<sub>2</sub>O<sub>3</sub> shows a higher reaction rate constant (<i>k</i>, min<sup>−1</sup>) than TiO<sub>2</sub> 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<sub>2</sub>O<sub>3</sub> over the TiO<sub>2</sub> 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 Ga<sub>2</sub>O<sub>3</sub>, in comparison with that of the TiO<sub>2</sub>, result in superior photocatalytic activity, in particular on aromatic volatile organic compounds (VOCs) with a high bond dissociation energy.https://www.mdpi.com/2073-4344/10/5/545gallium oxidephotocatalytic degradationvolatile organic compoundsultraviolet lightaromatic compoundnonaromatic compound |
| spellingShingle | Tae Hee Yoo Heejoong Ryou In Gyu Lee Junsang Cho Byung Jin Cho Wan Sik Hwang Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds Catalysts gallium oxide photocatalytic degradation volatile organic compounds ultraviolet light aromatic compound nonaromatic compound |
| title | Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds |
| title_full | Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds |
| title_fullStr | Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds |
| title_full_unstemmed | Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds |
| title_short | Comparison of Ga<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> Nanostructures for Photocatalytic Degradation of Volatile Organic Compounds |
| title_sort | comparison of ga sub 2 sub o sub 3 sub and tio sub 2 sub nanostructures for photocatalytic degradation of volatile organic compounds |
| topic | gallium oxide photocatalytic degradation volatile organic compounds ultraviolet light aromatic compound nonaromatic compound |
| url | https://www.mdpi.com/2073-4344/10/5/545 |
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