Study of Ozone Decomposition Using TiO_2-Graphene Composites

摘要

Graphene (Gn) were prepared by reduction of graphite oxide (GO), which was obtained from oxidation of graphite powder by a modified Hummers method. The composite of titanium dioxide/graphene (TiO_2/Gn) was synthesized using tetrabutyl titanate and GO as the precursors by a sol-gel method. The ozone photodecomposition efficiency of TiO_2/Gn was operated under ultraviolet-visible (UV-Vis, λ>365nm) light irradiation. Results showed that as-prepared TiO_2/Gn composite exhibited photodecomposition efficiency of 66.12% under UV-Vis light irradiation lh with the initial concentration of 0.150ppm-0.200ppm, preliminary larger than that of pure TiO_2 (25.95%), self-photolysis of ozone without photocatalysts (1.33%). The effects of initial concentration of ozone and photodecomposition mechanism were discussed.