Preparation, characterization and photocatalytic activity of manganese doped TiO(2) immobilized on silica gel.
A series of Mn-TiO(2)/SiO(2) (silica gel loaded with manganese doped TiO(2)) 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 photocatalytic degradation of methyl orange over Mn-TiO(2)/SiO(2). 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 Mn(2+) and Mn(3+) on the surface of 1.0mol% Mn-TiO(2)/SiO(2). Mn(3+) appears to trap electrons and prohibit the electron-hole recombination. The electrons trapped in Mn(3+) site are subsequently transferred to the adsorbed O(2). As a result, the combination of the electron-hole pair was reduced.
Xu
Yuehua
Y
College of Science, South China Agricultural University, Guangzhou, China. xuyuehua@scau.edu.cn
Lei
Bo
B
Guo
Laiqiu
L
Zhou
Wuyi
W
Liu
Youqin
Y
D002384:Catalysis; D008345:Manganese / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D010777:Photochemistry; D058428:Silica Gel; D012822:Silicon Dioxide / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
C009495:titanium dioxide; D008345:Manganese; D058428:Silica Gel; D012822:Silicon Dioxide; D014025:Titanium