Abstract
Surface modification of zinc gallate with SnOx species produces photocatalysts active for cresol oxidation using visible light. In these composite materials, the production rate of hydroxyl radicals and the cresol degradation rate just in visible light are higher than those with zinc gallate in UV light. The visible light absorbance in the newly introduced SnOx surface phase is attributed to the presence of Sn2+ as confirmed using Mossbauer spectroscopy. Because cresol degradation proceeds via direct oxidation by holes, the increased degradation rates in UV and visible light suggest an increase in the effective photo-oxidative reactivity of holes produced in the photocatalyst system.
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