关键词: 纳米TiO2;Sm,C共掺杂;光催化

Abstract: The nano-TiO2 photocatalysts with element doping by Sm and C were prepared via a facile sol-gel procedure.Samples were characterized by XRD, SEM, TEM, XPS, UV-Vis-DRS, PL and Nano-sizer nano particle size analyzer,etc.The photocatalytic activity of different TiO2 samples were evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp.The results show that single Sm ion doping inhibited the phase transition from anatase to rutile and restrained the increase of grain size, but single C ion doping promote formation of rutile phase.Appropriate doping amount of Sm and/or C broadene the absorption region to visible light, refined grain and decrease the recombination of the photo-generated electrons and holes.Doping of Sm and C improve the photocatalytic activity of TiO2 and there existe synergistic effect in co-doping.The degradation rate of MB over the sample with molar ratio of n(Sm)∶n(C)∶n(Ti)=0.01∶0.3∶1 and sintered at 500 ℃ is the best under the irradiation of fluorescent light, the first-order apparent rate constants increased by about 4.3 times than that of pure TiO2 under the same experimental conditions.

Key words: The nano-TiO2 photocatalysts with element doping by Sm and C were prepared via a facile sol-gel procedure.Samples were characterized by XRD, SEM, TEM, XPS, UV-Vis-DRS, PL and Nano-sizer nano particle size analyzer,etc.The photocatalytic activity of different TiO2 samples were evaluated by photocatalytic degradation of methylene blue (MB) under the irradiation of fluorescent lamp.The results show that single Sm ion doping inhibited the phase transition from anatase to rutile and restrained the increase of grain size, but single C ion doping promote formation of rutile phase.Appropriate doping amount of Sm and/or C broadene the absorption region to visible light, refined grain and decrease the recombination of the photo-generated electrons and holes.Doping of Sm and C improve the photocatalytic activity of TiO2 and there existe synergistic effect in co-doping.The degradation rate of MB over the sample with molar ratio of n(Sm)∶n(C)∶n(Ti)=0.01∶0.3∶1 and sintered at 500 ℃ is the best under the irradiation of fluorescent light, the first-order apparent rate constants increased by about 4.3 times than that of pure TiO2 under the same experimental conditions.