Methyl orange removal over Zn-incorporated TiO2 photo-catalyst

This study focuses on the removal of the methyl orange (sodium p-dimethyl amino azo benzene sulfonate) of a representative dye compound in a liquid photo-system using nanometer-sized Zn-incorporated TiO₂ synthesized by a solvothermal method. The Zn-incorporated TiO₂ particles exhibited a mixed structure of anatase of TiO₂ and ZnTiO₃ with a particle size of below 20nm. The absorbance was shifted to the higher wavelength on 2.0mol% Zn-incorporated TiO₂ compared to pure TiO₂. In the XRD pattern, the structure of ZnTiO₃ was seen at 2θ=31.75. The XPS result of O 1s confirmed that 2.0mol% ZnTiO₂ had a higher hydrophilic property (MeOH/MeO=0.46) than pure TiO₂ (MeOH/MeO=0.25) did. Based on these results, the photodecomposition for methyl orange in liquid reaction was enhanced over Zn-incorporated TiO₂ compared with pure TiO₂: methyl orange of 10ppm was completely decomposed after 120min over 2.0mol% Zn-incorporated TiO₂. KCI Citation Count: 53