Preparation, characterization and photocatalytic activity of manganese doped TiO2 immobilized on silica gel.
writer：Yuehua Xu, Bo Lei, Laiqiu Guo, Wuyi Zhou, Youqin Liu.
keywords：TiO2 ;Silica gel; Doping Mn; Photocatalytic; Methyl orange
source：期刊
specific source：Journal of Hazardous Materials
Issue time：2008年
Aseries ofMn-TiO2/SiO2 (silica gel loaded withmanganese doped TiO2) photocatalysts have been prepared by sol–gel method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Photocatalytic activities were enhanced in photocatalyticdegradation of methyl orange over Mn-TiO2/SiO2. XPS analysis shows that a Ti O Si or Ti O Mn bond is formed on the surface of photocatalyst. Mn is doped as a mixture of Mn2+ and Mn3+ on the surface
of 1.0 mol% Mn-TiO2/SiO2. Mn3+ appears to trap electrons and prohibit the electron–hole recombination. The electrons trapped in Mn3+ site are subsequently transferred to the adsorbed O2. As a result, the combination of the electron–hole pair was reduced.