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Citation: WANG Cheng-Ying, JIANG Hong-Quan, LI Jing-Shen, LU Zhi-Yu, YAN Pan-Pan. Preparation and Visible-light Responsive Mechanism of Nanoscale TiO_2-yN_x Photocatalyst[J]. Chinese Journal of Applied Chemistry, ;2010, 27(12): 1413-1418. doi: 10.3724/SP.J.1095.2010.00038 shu

Preparation and Visible-light Responsive Mechanism of Nanoscale TiO_2-yN_x Photocatalyst

School of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150500

Received Date: 18 January 2010
Revised Date: 7 April 2010

TiO_2-yN_x nanoparticles were prepared by in situ doping sol-gel method using urea as the nitrogen source. Their visible-light photocatalytic activity was evaluated by the photocatalytic degradation of methylene blue(MB) in an aqueous solution under visible-light irradiation.The effects of original pH value,nitrogen-doping content and calcination temperature on the as-prepared samples were investigated.The visible-light responsive mechanism of the N-doped sample was studied by means of XRD,XPS,ESR and DRS. The results show that the optimal conditions for the preparation of TiO_2-yN_x nano-particles are as follows:original pH value 0.52,doping proportion of n(N) to n(Ti) 1:6,and calcination temperature 440℃. The as-prepared sample of single anatase phase with 0.77% N atoms and with average crystal size 19.0 nm exhibits a good visible-light photocatalytic activity. N-doping leads to increasing the surface hydroxyl groups and forming abundant surface oxygen vacancies bounding single-electrons. The O atoms in the TiO₂ lattice are substituted by the doped N atoms so that form the N-Ti-O and O-N-Ti bonding structures.N-doping results in a remarkable red-shift of the TiO₂ absorption band-edge and significantly increases the absorption of visible-light.The results indicate that N-doping changes the electronic structure of TiO₂ and decreases the band-gap.The visible-light response of the N-doped sample is ascribed to a synergetic effect of impurity and defect energy levels that are originated from the substitutional N-doping and the formation of oxygen vacancies accordingly.
- nano titania,
- N-doping,
- sol-gel,
- visible-light response,
- photocatalysis
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Preparation and Visible-light Responsive Mechanism of Nanoscale TiO_2-yN_x Photocatalyst