Effect of Co, Ga and Nd Additions on Photocatalytic Properties

초록

In the present study, metal ion doped TiO2 powders were prepared by sol-gel process using titanium isopropoxide as a Ti precursor, and cobalt, gadolinium or neodymium as a dopant. For the prepared doped TiO2 nanopowders, the photocatalytic behaviors in decomposing aqueous 1,4-dichlorobenzene (DCB) were investigated as a function of doping level and preparation conditions. We found that all of the metal ion doping improved the photocatalytic activity of TiO2, and Nd doping was most effective among them, while Co doping was least effective. XRD analyses showed that the doping of Ga and Nd ions suppresses anatase-to-rutile phase transition for the TiO2, whereas the doping of Co did not influence the phase transition. The UV-visible absorption spectra for these metal ion doped samples were red-shifted by 20~40nm depending upon the doping level.