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Polydopamine-Coated TiO2 Nanotubes for Selective Photocatalytic Oxidation of Benzyl Alcohol to Benzaldehyde under Visible Light

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 oxygen radical anions. These radicals react with benzyl alcohol and lead to its selective dehydrogenation oxidation towards benzaldehyde.

preprint2016arXivOpen access
Jyotsna TripathyGabriel LogetMarco AltomarePatrik Schmuki
cond-mat.mtrl-sci
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Jyotsna TripathyGabriel LogetMarco AltomarePatrik Schmuki

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