Application of Enhanced Photocatalytic Activity of Phosphomolybdic Acid upon Hybridization with Hexamine-Cobalt in Fabrication of Visible Light-Driven Titanium Dioxide Nanoparticles

Phosphomolybdate-hexamine-cobalt (PMA-HMT-Co), a new hybrid prepared by coprecipitation method, was used for coating of titanium dioxide nanoparticles in order to improve photocatalytic activity to visible light. PMA-HMT-Co and TiO۲-PMA-HMT-Co were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction and scanning electron microscopy. The diffuse reflectance spectroscopy was used to evaluate the band gap variation. The band gap of PMA-HMT-Co decreased and hence, its photocatalytic activity was enhanced under sunlight irradiation. With the incorporation of PMA-HMT-Co, the band gap of titanium dioxide was transferred from UV to visible region successfully. Rhodamine B (RhB) decolorization tests indicated higher photocatalytic activity of TiO۲-PMA-HMT-Co under sunlight irradiation. Photodegradation takes place through the excitation of modified titanium dioxide and the creation of holes (h+) and oxidation of dye.

کلیدواژه ها:

Photocatalyst ، Titanium Dioxide ، Polyoxometalate ، Dyes ، Organic-Inorganic Hybrid ، Solar Light