Sol-gel preparation and photocatalytic performance of TiO2/SrAl2O4: Eu~(2+), Dy~(3+) toward the oxidation of gaseous benzene

摘要

It has been found that the photocatalytic activity of TiO2 toward the decomposition of gaseous benzene can be greatly enhanced by loading TiO2 on the surface of SrAl2O4: Eu~(2+), Dy~(3+) using sol-gel technology. The prepared photocatalyst was characterized by BET, XRD, and XPS analyses. XRD results reveal that the peaks of titania in either rutile or anatase form are not detected by XRD in the 20 region from 20° to 50°. The binding energy values of Ti 2p of pure TiO2 are 458.90 and 464.60 eV, while for TiO2/SrAl2O4: Eu~(2+), Dy~(3+), the binding energy values of Ti 2p are 458.50 and 464.20 eV. The results indicate that the optimum loading of TiO2 is 1 wt% and TiO2/SrAl2O4: Eu~(2+), Dy~(3+) (1 wt%) demonstrates 1.4 times the photocatalytic activity of that of pure TiO2, but the underlying mechanism of SrAl2O4: Eu~(2+), Dy~(3+) in the photocatalytic reaction remains to be unraveled.