caa a22 4500 46322602X CHVBK 20180405153227.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10853-007-1919-9 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1919-9 Effects of samarium dopant on photocatalytic activity of TiO2 nanocrystallite for methylene blue degradation [Elektronische Daten] [Qi Xiao, Zhichun Si, Jiang Zhang, Chong Xiao, Zhiming Yu, Guanzhou Qiu] Sm3+-doped TiO2 nanocrystalline was synthesized by a sol-gel auto-combustion method and characterized by X-ray diffraction, Brunauer-Emmett-Teller method (BET), UV-vis diffuse reflectance spectroscopy (DRS), and also photoluminescence (PL) emission spectroscopy. The photocatalytic activity of Sm3+-TiO2 catalyst was evaluated by measuring degradation rates of methylene blue (MB) under either UV or visible light. The results showed that doping with the samarium ions significantly enhanced the photocatalytic activity for MB degradation under UV or visible light irradiation. This was ascribed to the fact that a small amount of samarium dopant simultaneously increased MB adsorption capacity and separation efficiency of electron-hole pairs. The results of DRS showed that Sm3+-doped TiO2 had significant absorption between 400nm and 500nm, which increased with the increase of samarium ion content. The adsorption experimental demonstrated that Sm3+-TiO2 had a higher MB adsorption capacity than undoped TiO2 and adsorption capacity of MB increased with the increase of samarium ion content. It is found that the stronger the PL intensity, the higher the photocatalytic activity. This could be explained by the points that PL spectra mainly resulted from surface oxygen vacancies and defects during the process of PL, while surface oxygen vacancies and defects could be favorable in capturing the photoinduced electrons during the process of photocatalytic reactions, so that the recombination of photoinduced electrons and holes could be effectively inhibited. Springer Science+Business Media, LLC, 2007 Xiao Qi School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut Si Zhichun School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut Zhang Jiang School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut Xiao Chong School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut Yu Zhiming School of Materials Science and Engineering, Central South University, 410083, Changsha, China aut Qiu Guanzhou School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/22(2007-11-01), 9194-9199 0022-2461 42:22<9194 2007 42 10853 https://doi.org/10.1007/s10853-007-1919-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1919-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xiao Qi School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 700 1- Si Zhichun School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 700 1- Zhang Jiang School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 700 1- Xiao Chong School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 700 1- Yu Zhiming School of Materials Science and Engineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 700 1- Qiu Guanzhou School of Resources Processing and Bioengineering, Central South University, 410083, Changsha, China aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/22(2007-11-01), 9194-9199 0022-2461 42:22<9194 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer