Abstract
Visible light photocatalysis represents a promising procedure for indoor air purification. Here we developed the Ag nanoparticles decorated graphitic carbon nitride photocatalyst film supported on glass substrate. This photocatalyst film can effectively use visible light to degrade various volatile organic compounds which contain formaldehyde, acetaldehyde, ethylene, benzene, toluene, and p-xylene and deactivate Escherichia coli, Staphylococcus aureus, and Candida albicans. The decoration of Ag nanoparticles enhanced the visible-light-driven activity of graphitic carbon nitride because Ag nanoparticles strongly absorb visible light through the localized surface plasmon resonance effect and facilitate the efficient separation of charge carriers by forming Schottky barrier with the semiconductor. Photo-generated holes and superoxide radical anions, rather than hydroxyl radicals, are the major active species in the photocatalytic degradation of volatile organic compounds and deactivation of microorganisms. The application potential of the developed photocatalyst film for indoor air purification was demonstrated by the efficient removal of HCHO and TVOC under a simulated indoor environment and the favorable recyclability of the photocatalyst.
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