Synthesis of N,Fe Co-doped TiO_2 Nanomaterials via Solid State Reaction and Their Photodegradation of Quinoline Irradiated under Visible Light

Fe-doped TiO2(Fe-TiO2)and N,Fe co-doped TiO2(N-Fe-TiO2)nanomaterials were synthesized by solid-state reaction,respectively.The textural properties of the samples were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),ultraviolet visible light spectroscope(UV-Vis),X-ray photoelectron spectroscope(XPS).The components of the samples were determined by atomic absorption spectrum(AAS)and automatic elemental analyzer.Moreover,the photodegradation properties of quinoline irradiated under visible light on the materials were investigated.The results show that N atoms as N3-states are incorporated into the lattice of TiO2,and Fe3+ ions occupy the sites of Ti4+ by isomorphous replacement in the spheric shape N-Fe-TiO2 nanomaterials.The UV-Vis absorption onset of the N-Fe-TiO2 samples extends well into the visible region at 600 nm.Furthermore,an increase of the initial ratio of N2H4.H2O to FeCl3.6H2O enhances the phase transformation of N-Fe-TiO2 catalysts.At 25℃,pH=6.5,the rule of pseudo-first-order reaction and excellent photocatalytic activity on the N-Fe-TiO2 catalysts are found in the process of photodegradation of quinoline.However,quinoline can not be degradated by pure TiO2 under visible light irradiation.The reaction rate constant of N-Fe-TiO2(n(N2H4.H2O):n(FeCl3.6H2O)=1:9)catalyst is higher than that of pure TiO2 powder.