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Polydopamine-coated TiO2 nanotubes for selective photocatalytic oxidation of benzyl alcohol to benzaldehyde under visible light

Abstract : TiO2 nanotube arrays grown by anodization were coated with thin layers of polydopamine as visible light sensitizer. The PDA-coated TiO2 scaffolds were used as photocatalyst for selective oxidation of benzyl alcohol under monochromatic irradiation at 473 nm. Benzaldehyde was selectively formed and no by-products could be detected. A maximized reaction yield was obtained in O2-saturated acetonitrile. A mechanism is proposed that implies firstly the charge carrier generation in polydopamine as a consequence of visible light absorption. Secondly, photo-promoted electrons are injected in TiO2 conduction band, and subsequently transferred to dissolved O2 to form O2 .- radicals. These radicals react with benzyl alcohol and lead to its selective dehydrogenation oxidation towards benzaldehyde. Copyright © 2016 American Scientific Publishers All rights reserved.
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01341575
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Submitted on : Monday, July 4, 2016 - 2:27:29 PM
Last modification on : Friday, July 10, 2020 - 4:23:58 PM

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J. Tripathy, G. Loget, M. Altomare, P. Schmuki. Polydopamine-coated TiO2 nanotubes for selective photocatalytic oxidation of benzyl alcohol to benzaldehyde under visible light. Journal of Nanoscience and Nanotechnology, American Scientific Publishers, 2016, 16, pp.5353--5358. ⟨10.1166/jnn.2016.12595⟩. ⟨hal-01341575⟩

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