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Visible-light Aerobic Oxidation of Benzyl Alcohol over Porphyrin-sensitized Titanium Dioxide Photocatalysts

Journal of the Japan Petroleum Institute, ISSN: 1349-273X, Vol: 66, Issue: 3, Page: 88-93
2023
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Researchers at Kyoto University Report New Data on Photocatalytics (Visible-light Aerobic Oxidation of Benzyl Alcohol Over Porphyrin-sensitized Titanium Dioxide Photocatalysts)

2023 JUN 16 (NewsRx) -- By a News Reporter-Staff News Editor at Japan Daily Report -- Current study results on Nanotechnology - Photocatalytics have been

Article Description

Utilization of visible light for the selective aerobic oxidation of organic molecules has the potential to provide an environmentally-friendly route for the synthesis of chemicals. Dye-sensitized photocatalysts are effective for the reaction under visible-light irradiation. The aggregated dyes have different molecular interactions in the excited states from the monomer; however, the effect of the aggregation on the photocatalytic activity has not been investigated in detail. In the present work, we prepared titanium dioxide (TiO2) photocatalysts modified with tetrakis(4-carboxyphenyl)porphyrin (TCPP) dye and changed the aggregation states of TCPP by an adsorption method. The change of the Soret band shape in the diffuse-reflectance UV-vis spectra indicated that the aggregated TCPP was formed on the TiO2 surface at high TCPP loadings. The photocatalytic activity of the TCPP-modified TiO2 photocatalysts was investigated using photocatalytic oxidation of benzyl alcohol in air under visible light. Using the optimized reaction conditions, we found that there is a strong positive correlation between the initial reaction rate and the absorption amount of the visible light even in the different aggregation states. The result indicated that the aggregation of the TCPP molecules reduced the light absorption and thus decreased the photocatalytic activity.

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