Abstract
Photocatalytic oxidation processes (PCO) represent more and more promising technologies for air purification and the development of new solutions in pollution sensing and prevention by using adequate nanostructures with unique properties has gained more interest in the scientific community. The present work is meant to show the production, characterization and the photocatalytic performance of nanostructured membranes based on electrospun polyacrylonirile (PAN) scaffolds and graphene/titania based catalysts. Three different systems of photocatalyst were chosen in order to compare their photocatalytic properties: pristine TiO2, TiO2 plus a few-layers graphene and TiO2/reduced-graphene composite obtained by hydrothermal method from graphene oxide. Results of the photocatalytic performance on methanol gas-phase degradation, revealed a higher reaction rate of the graphene based photocatalysts wherein an effective charge transfer, enhanced by graphene, has been supposed to reduce the charge recombination increasing the photocatalytic activity of TiO2 nanoparticles. Moreover, it has been found that the performance of the nanostructured membranes can be restored by stripping with an inert gas several times and this property makes them a good candidate as active filter media.
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