Preparation and characterization of visible-light responsive photocatalyst S/TiO₂

The sulfur-doped titanium dioxide (S/TiO₂) was prepared by calcinations. The photocatalytic decomposition of benzoic acid solution was carried out under simulated sun light; the photocatalytic activity is 2.7 times of TiO₂. The results of XRD show that the sulfur can restrain the crystallization transformation of TiO₂ from anatase to rutile, although the calcinations temperature has attained 500 °C the crystallization still is anatase entirely. The responsive wavelength range of S/TiO₂ was shifted; it has obvious absorption in the region from 320 to 550 nm. The S (S⁶⁺) substituted for some of the lattice titanium atoms in S/TiO₂. At the same time the XRF also prove the formation of S⁶⁺ and the atomic content is 2.13%.