Abstract: The supported catalysts Sm2O3/TiO2,Sm2O3 doped TiO2 bulks,were synthesized by impregnation method,and employed to investigate the photodegradation behaviors of methylene blue under UV-light irradiation.The fabricated Sm2O3/TiO2 samples were characterized by several techniques such as XRD、SEM、TEM、N2-adsorption,XPS,ICP-OES.The effects of experiential parameters such as Sm2O3 content and methylene blue concentration on the photocatalytic degradation performance in methylene blue as well as photocatalytic stability were also performed.The results show that Sm2O3/TiO2 exhibited higher photocatalytic activity for methylene blue compared with TiO2-alone under UV-light region,which is ascribed to the crystal defect of TiO2 generated by Sm2O3 doping.This crystal effect,as the trap of photo electrons and holes,can achieve the effective separation of electron-hole pairs,landing to the enhancement in photocatalytic activity of Sm2O3/TiO2 samples.The photodegradation activity of Sm2O3/TiO2 increases and then decreases as Sm2O3-doped content increasing,while decreased with methylene blue concentration.Sm2O3/TiO2 samples with Sm2O3-doped content of 5.0wt; did not exhibit an evident loss of activity for the UV-light droved degradation of methylene blue after seven cycles under the same conditions.

Key words: The supported catalysts Sm2O3/TiO2,Sm2O3 doped TiO2 bulks,were synthesized by impregnation method,and employed to investigate the photodegradation behaviors of methylene blue under UV-light irradiation.The fabricated Sm2O3/TiO2 samples were characterized by several techniques such as XRD、SEM、TEM、N2-adsorption,XPS,ICP-OES.The effects of experiential parameters such as Sm2O3 content and methylene blue concentration on the photocatalytic degradation performance in methylene blue as well as photocatalytic stability were also performed.The results show that Sm2O3/TiO2 exhibited higher photocatalytic activity for methylene blue compared with TiO2-alone under UV-light region,which is ascribed to the crystal defect of TiO2 generated by Sm2O3 doping.This crystal effect,as the trap of photo electrons and holes,can achieve the effective separation of electron-hole pairs,landing to the enhancement in photocatalytic activity of Sm2O3/TiO2 samples.The photodegradation activity of Sm2O3/TiO2 increases and then decreases as Sm2O3-doped content increasing,while decreased with methylene blue concentration.Sm2O3/TiO2 samples with Sm2O3-doped content of 5.0wt; did not exhibit an evident loss of activity for the UV-light droved degradation of methylene blue after seven cycles under the same conditions.