Open AccessPreparation, Characterization and Visible Light Photocatalytic Activities of Samarium-Doped Mixed Crystalline Phase TiO2 Nanoparticles
Author(s) -
Fuchang Peng,
Qi Lai,
Wei Chang,
Yan Cui
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/562/1/012031
Subject(s) - photocatalysis , anatase , samarium , materials science , rutile , x ray photoelectron spectroscopy , doping , visible spectrum , phase (matter) , valence (chemistry) , nuclear chemistry , analytical chemistry (journal) , chemical engineering , inorganic chemistry , chemistry , catalysis , optoelectronics , biochemistry , organic chemistry , chromatography , engineering
Mixed crystalline phase TiO 2 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 TiO 2 was evaluated by photocatalytic degradation of MB under the irradiation of fluorescent lamp. The results indicate that samarium appears two kinds of Sm 3+ and Sm 2+ valence state on the surface of TiO 2 . 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-TiO 2 in MB degradation is evidently enhanced. The MB degradation rate of Sm-TiO 2 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 TiO 2 under the same experimental conditions.