Enhancing the photocatalytic decomposition of acetaldehyde in air by immobilized titanium dioxide

Fumihide Shiraishi, Masashi Iwanaga, Natsuko Kitagawa, Fumiya Miyazaki

研究成果: Contribution to journalArticle査読


BACKGROUND: In treatment of air using UV-irradiated titanium dioxide (TiO2), volatile organic compound (VOC) concentrations mostly reach zero or decrease to a miniscule amount. However, when acetaldehyde (AA) is treated by photocatalysts immobilized on silica or activated carbon (AC) particles, which have a high ability to adsorb VOCs, the AA concentration decreases rapidly initially, but decreases very slowly after AA has been decomposed to a certain low concentration. To overcome this problem, the performances of photocatalysts immobilized on different supporting materials were investigated. RESULTS: Computer simulations clarify that the slow decrease in the AA concentration in the final stage is due to the desorption of adsorbed AA, taking a much longer time to completely decompose AA. The simulations also suggest two strategies to overcome the problem: using a support with a smooth surface and low adsorption ability, and increasing the photocatalytic activity. The first strategy was tested by immobilizing TiO2 on glass tubes, PET film sheets and aluminum foil sheets with low adsorption abilities. The experimental results indicate that the AA concentrations for these supports decrease at lower rates than for supports with high adsorption ability, but decrease steadily toward zero. The second strategy was tested by increasing the amount of immobilized-photocatalyst particles with high adsorption abilities, resulting in a shorter time for the AA concentration to reach zero. CONCLUSION: For completely decomposing AA by an immobilized photocatalyst in a short period of time, the use of supporting particles with a high adsorption ability should be avoided.

ジャーナルJournal of Chemical Technology and Biotechnology
出版ステータス出版済み - 7 1 2020

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 化学工学(全般)
  • 再生可能エネルギー、持続可能性、環境
  • 燃料技術
  • 廃棄物管理と処理
  • 汚染
  • 有機化学
  • 無機化学


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