Photocatalytic Oxidation of Gaseous Ammonia over Fluorinated TiO2 with exposed (001) facets

C. Zhang, H. Wu, J. Ma, Y. Li, H. He
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, CN

Keywords: ammonia, photocatalytic oxidation, indoor air

Summary:

Gaseous ammonia (NH3) is an alkaline gas with a pungent odor and is harmful to the environment and people’s health. Therefore, it is of great interest to eliminate indoor air NH3 to meet environmental regulations and health needs. Photocatalytic oxidation (PCO) is a promising method for indoor air NH3 destruction. In this study, anatase TiO2 with exposed (001) facets was synthesized and tested for the PCO of NH3 reaction under UV light irradiation at room temperature. The effects of both the (001) facet percentage and the surface fluorination on the TiO2 activity for the PCO of NH3 reaction were examined. The F-TiO2 catalyst showed the best activity among the series of catalysts. Both the exposure of a high percentage of (001) facets and the presence of surface ≡Ti-F groups contributed to the excellent activity of F-TiO2, but the surface fluorination played a dominant role in enhancing the activity of the PCO of NH3.