Abstract
The photocatalytic transformation of 4-hydroxybenzylalcohol (HBA) on ZnO or TiO 2 leads to a mixture of three photoproducts: 4-hydroxybenzaldehyde (HBZ), 3,4-dihydroxybenzylalcohol (DHBA) and hydroquinone (HQ). In the presence of isopropanol (iPrOH), used as OH quencher, the formation of DHBA is completely inhibited and the formation of HBZ is partly reduced. The product least affected by iPrOH is HQ. However, the oxidation of HBA by OH, produced in the Fenton reaction, leads to HBZ and DHBA, the formation of HQ being almost negligible. These results suggest that positive holes and hydroxyl radicals have different regioselectivities in the photocatalytic transformation of HBA. HQ results from the oxidation by h +, DHBA from the reaction with OH and HBZ is produced by both species.
Published Version
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