Preparation, Characterization and Visible Light Photocatalytic Activities of Samarium-Doped Mixed Crystalline Phase TiO2 Nanoparticles

7th Annual International Conference on Materials Science and Engineering

Peng, Fuchang^1^2 ; Lai, Qi^1^2 ; Chang, Wei^3 ; Cui, Yan^2

School of Vanadium and Titanium^1

Panzhihua Graphene Engineering Technology Research Center^2

School of Foreign Languages, Panzhihua University, 10 Airport Road, Panzhihua

617000, China^3

关键词: Crystalline phase;    Experimental conditions;    Fluorescent light;    Photo catalytic degradation;    Photogenerated electrons;    Rutile and anatase;    Sintered temperature;    Visible light photocatalytic activity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/562/1/012031/pdf
DOI  :  10.1088/1757-899X/562/1/012031

来源: IOP

【 摘 要 】

Mixed crystalline phase TiO2 nanoparticles with different content of Sm ion were prepared by a facile sol-gel method. The samples were characterized by XRD, XPS, UV-Vis-DRS, and PL. The influence of Sm-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of MB under the irradiation of fluorescent lamp. The results indicate that samarium appears two kinds of Sm3+ and Sm2+ valence state on the surface of TiO2. Sm doping can restrain the phase transition from anatase to rutile, and prevent the grain growth. Appropriate amount of Sm doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photo-generated electron and hole pairs, expand the wavelength range of absorption spectrum. Moreover, the photocatalytic activity of Sm-TiO2 in MB degradation is evidently enhanced. The MB degradation rate of Sm-TiO2 samples with n(Sm): n(Ti)=0.006 is the best under the irradiation of fluorescent light when the sintered temperature T=500°C, it is 97% within 6 h, which is significantly higher than 56.4% of pure TiO2 under the same experimental conditions.