Abstract
A visible-light-active commercial TiO 2 powder was prepared by thermal nitrogen-plasma processing as the surface treatment. The photoactivity of the treated TiO 2 samples was evaluated in the photocatalytic degradation of gaseous 2-Propanol (IPA) in a batch reactor. XPS analysis showed that oxygen vacancies formed in the lattice of the treated TiO 2 particles and no nitrogen peaks were detected. With increasing the treating time, the visible absorbance and oxygen vacancies were increased but the surface area of treated sample was decreased. The photodegradation rate of IPA under visible light illumination depended strongly on the treating time of the catalyst, and the photoactivity of the treated sample was higher than that of plain TiO 2. From the results of reaction rate constant and mineralization yield of IPA, it was found that the TiO 2 powders treated for 30 min demonstrated the highest photocatalytic activity among all samples. This high visible light photoactivity was ascribed to an intermediate level of visible absorbance as well as optimal oxygen vacancies after the thermal nitrogen-plasma surface treatment.
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