关键词: 光催化剂;介孔TiO2微球;La/Fe共掺杂剂;光学性能

Abstract: The La/Fe co-doped monodisperse mesoporous TiO 2 microspheres were prepared by a triblock copolymer ( EO106 PO70 EO106 ( F127 ) ) modified sol-gel method with titanium (Ⅳ) isopropoxide as a titanium source.The prepared sample was characterized by X-ray diffraction, field emission scanning electron microscopy equipped with an energy-dispersive X-ray spectrum, TEM, BET, X-ray photoelectron spectroscopy and UV-visible diffuse reflectance spectroscopy , respectively . The photocatalytic activities of La/Fe co-doped mesoporous TiO 2 microspheres were characterized with methylene blue ( MB) solution as a target pollutant under ultraviolet light .The results show that La 3 +-doping restrains the increase of grain size , the UV-visible light absorption band of La 3 +/Fe3+co-doped TiO2 exhibited red-shift and the optical band gap of mesoporous TiO 2 microspheres is decreased .The photocatalytic activity of La3+(1at;) doped, La3+and Fe3+co-doped TiO2 mesoporous microspheres is higher than that of pure TiO 2 , and the photocatalytic activity of TiO 2 co-doped with Fe 3+( 1 at;) and La3+(1at;) is notably improved due to the cooperative actions of the two dopants .

Key words: The La/Fe co-doped monodisperse mesoporous TiO 2 microspheres were prepared by a triblock copolymer ( EO106 PO70 EO106 ( F127 ) ) modified sol-gel method with titanium (Ⅳ) isopropoxide as a titanium source.The prepared sample was characterized by X-ray diffraction, field emission scanning electron microscopy equipped with an energy-dispersive X-ray spectrum, TEM, BET, X-ray photoelectron spectroscopy and UV-visible diffuse reflectance spectroscopy , respectively . The photocatalytic activities of La/Fe co-doped mesoporous TiO 2 microspheres were characterized with methylene blue ( MB) solution as a target pollutant under ultraviolet light .The results show that La 3 +-doping restrains the increase of grain size , the UV-visible light absorption band of La 3 +/Fe3+co-doped TiO2 exhibited red-shift and the optical band gap of mesoporous TiO 2 microspheres is decreased .The photocatalytic activity of La3+(1at;) doped, La3+and Fe3+co-doped TiO2 mesoporous microspheres is higher than that of pure TiO 2 , and the photocatalytic activity of TiO 2 co-doped with Fe 3+( 1 at;) and La3+(1at;) is notably improved due to the cooperative actions of the two dopants .