Photocatalytic Decolonization of Malachite Green in the Presence of Fe_3O_4/TiO_2/CuO Nanocomposites

摘要

Fe_3O_4/TiO_2/CuO nanocomposites have been synthesized by sol-gel method and further used as photocatalyst for decolorization of malachite green from aqueous system under UV and visible light irradiation. X-ray diffraction confirmed the phase purity and crystallinity of nanocomposites. From UV-visible spectroscopy measurements it is found that the absorption peak of TiO_2 nanoparticles is shifted towards longer wavelength after formation of nanocomposites indicating a modification of bandgap. The photocatalytic activity of TiO_2 nanoparticles was enhanced by hybridization under visible light irradiation. The photodegradation of malachite green was significantly reduced by the addition of tert-butyl alcohol indicated that OH radicals played an important role in the photocatalytic mechanism.