Synergistic effect of N- and F-codoping on the structure and photocatalytic performance of TiO2
Jiemei Yu , Zongming Liu , Haitao Zhang , Taizhong Huang , Jitian Han , Yihe Zhang , Daohuang Chong
DOI:10.1016/j.jes.2014.06.046
Received March 06, 2014,Revised June 13, 2014, Accepted , Available online February 10, 2015
Volume 27,2015,Pages 148-156
Three types of TiO2 nanostructures were synthesized via a facile hydrolysis method at 195 ℃. Effects of the preparation method and doping with N and F on the crystal structure and photocatalytic performance of TiO2 were investigated. The nanomaterials were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller porosimetry, ultraviolet-visible diffuse reflectance spectroscopy and fluorescent emission spectra. Their photo-catalytic activity was examined by the photodegradation of methylene blue in aqueous solution under both ultra-violet and visible light irradiation. The results show that nitrogen and fluorine co-doped anatase TiO2 had the characteristics of a smaller crystalline size, broader light absorption spectrum and lower charge recombination than pure TiO2. Most importantly, more efficient photocatalytic activity under both ultra-violet and visible light was observed. The obtained N-F-TiO2 nanomaterial shows considerable potential for water treatment under sunlight irradiation.
