Abstract
The paper demonstrates that the photocatalytic activity of TiO 2 towards the decomposition of gaseous benzene in a batch reactor can be greatly improved by loading TiO 2 on the surface of CeO 2–ZrO 2. The research investigates the effects of three metals doping into Ce 0.5Zr 0.5O 2 on photocatalytic activity of TiO 2/Ce 0.45Zr 0.45M 0.1O X (M = Y, La, Mn). The prepared photocatalysts were characterized by BET, XRD, UV–vis diffuse reflectance and XPS analyses. BET surface area of TiO 2/Ce 0.45Zr 0.45M 0.1O X (M = Y, La, Mn) is smaller than that of Ce 0.5Zr 0.5O 2. XRD results reveal that the deposited titania is highly dispersed as in the CeO 2–ZrO 2 matrix, doping M in the CeO 2–ZrO 2 lattice causes the changing of lattice space and the diffraction peaks shift to higher 2 θ position. Among these four catalysts, the band gap value of TiO 2/Ce 0.45Zr 0.45La 0.1O X is the lowest. The binding energy value of Ti 2p 3/2 of four catalysts transfers to a lower value. The order of photocatalytic activity is TiO 2/Ce 0.45Zr 0.45La 0.1O X > TiO 2/Ce 0.45Zr 0.45Y 0.1O X > TiO 2/Ce 0.45Zr 0.45Mn 0.1O X > TiO 2/Ce 0.5Zr 0.5O 2 > TiO 2. The proposed mechanism is of electron transfer and the stronger absorption in the region 210–400 nm.
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