Improved photocatalytic ozone abatement over transition metal-grafted titanium dioxide

J. Patzsch, J. Z. Bloh

Catal. Today, (2017),  doi: 10.1016/j.cattod.2017.07.010

 

Abstract

Photocatalysis can be an effective means to combat air pollution. Up to now, mainly direct NOx abatement has been studied, but ozone abatement could also contribute significantly to improved air quality. The ozone decomposition rates of different commercial titanium dioxide based photocatalysts grafted with copper, manganese or iron ions were studied both under UVA illumination and under dark conditions. Copper and manganese grafting were effective in significantly increasing the ozone decomposition rate of the photocatalysts. The procedure worked best when using low surface area pigmentary anatase rather than nanoparticulate photocatalysts. Manganese grafting also increased the ozone abatement under dark conditions, likely due to small MnOx clusters acting as catalysts. Iron grafting appears to be the most universal method of improving the photocatalytic ozone removal rate, as it worked for all four different photocatalysts studied. Extremely low iron grafting ratios of 0.002 at.% were sufficient to dramatically improve the performance.

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