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Kinetic analysis supporting multielectron reduction of oxygen in bismuth tungstate-photocatalyzed oxidation of organic compounds
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| Title: | Kinetic analysis supporting multielectron reduction of oxygen in bismuth tungstate-photocatalyzed oxidation of organic compounds |
| Authors: | Hori, Haruna Browse this author | | Takashima, Mai Browse this author | | Takase, Mai Browse this author | | Ohtani, Bunsho Browse this author →KAKEN DB |
| Keywords: | Photocatalytic organics decomposition | | Two-electron oxygen reduction | | Radical chain reaction | | Bi(tri) modal light-intensity dependence | | Threshold light intensity | | Effective particle size |
| Issue Date: | 1-Sep-2018 |
| Publisher: | Elsevier |
| Journal Title: | Catalysis today |
| Volume: | 313 |
| Start Page: | 218 |
| End Page: | 223 |
| Publisher DOI: | 10.1016/j.cattod.2018.01.001 |
| Abstract: | Light-intensity dependence of the rate of carbon-dioxide liberation in the photocatalytic decomposition of acetic acid by bismuth tungstate particles suspended in an aqueous solution under aerobic conditions was measured by monochromatic photoirradiation using a monochromator (lower intensity < 20 mW) and high-intensity UV-LED (higher intensity < 300 mW). The light-intensity dependence of both flake ball-shaped micrometer-sized particles (FB-BWO) and wet ball-milled nanometer-sized particles (ML-BWO) seemed to be bimodal, i.e., first and 0.5th orders in the lower and higher intensity ranges, respectively. Approximately 1.5th and second-order light-intensity dependences were also observed for ML-BWO at the lowest intensity range and for FB at the highest intensity range, respectively. The light-intensity dependences could be reproduced by a kinetic model that was derived on the basis of the assumption of oxygen reduction via two-electron (and possibly four-electron at the highest intensity region) transfer and a radical chain mechanism with peroxy radicals as chain carriers. The calculated threshold intensity between the first and 0.5th-order light-intensity dependences for FB-BWO was appreciably lower than that of ML-BWO, suggesting that the higher FB-BWO activity is attributable to the larger effective particle size for accumulation of two (or four) electrons. |
| Rights: | © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/79146 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 高島 舞
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