Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

摘要

Supported carbon nanosheets and carbon nanotubes served as sacrificialtemplates for preparing spacious TiO2 photocatalytic thin films. Amorphous TiO2was deposited conformally on the carbonaceous template material by atomic layerdeposition (ALD). Upon calcination at 550{\deg}C, the carbon template wasoxidatively removed and the as-deposited continuous amorphous TiO2 layerstransformed into interlinked anatase nanoparticles with an overall morphologycommensurate to the original template structure. The effect of type oftemplate, number of ALD cycles and gas residence time of pollutant on thephotocatalytic activity, as well as the stability of the photocatalyticperformance of these thin films was investigated. The TiO2 films exhibitedexcellent photocatalytic activity towards photocatalytic degradation ofacetaldehyde in air as a model reaction for photocatalytic indoor air pollutionabatement. Optimized films outperformed a reference film of commercial PC500.