期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 380, 期 -, 页码 121-127出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2012.04.069
关键词
TiO2; Rare earth ion; Heteropolyacid; Co-doping; Photocatalytic activity
资金
- National Natural Science Foundation of China [21103121]
- Research Fund for the Doctoral Program of Higher Education of China [20110032120011]
- Science and Technology Project of Guangdong Province, China [2011A030700003, 2010B090300017, 2009B091300023, 2009A030902003]
Nano-scale TiO2 photocatalysts co-doped by rare earth ions (La3+, Ce3+) and heteropolyacids were designed and prepared by sol-gel method to probe synergistic effect on photocatalytic elimination of organic compounds, and their physicochemical properties were characterized by X-ray diffraction (XRD), specific surface area and porosity (BET and BJH), high resolution transmission electron microscopy (HRTEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), and X-ray photoelectron spectroscopy (XPS) as well as Raman spectroscopy. The photocatalytic activity of prepared catalysts was evaluated by the degradation of methylene blue (MB) in water under UV-light irradiation. The results showed that the co-doping of the rare earth ions and heteropolyacids can significantly improve the photocatalytic activity of prepared composite photocatalysts due to the efficient inhibition of the recombination of photogenerated electron-hole pairs. The enhancement mechanism of co-doping of the rare earth ions and heteropolyacids on TiO2 is also discussed. (C) 2012 Elsevier Inc. All rights reserved.
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