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Abstract
In order to improve the visible light response and reaction efficiency of nitrogen-doped TiO2, urea is used as nitrogen source and silica gel as load agent. Sol-gel method is used to prepare powder of nitrogendoped TiO2 supported on SiO2 and then by incipient-wetness impregnation method to load MnO2 on catalyst, after drying, roasting to prepare the composite photo-catalyst. The prepared composite catalysts were characterized by XPS, TEM, SEM, XRD and other methods. Moreover, the photo-catalytic activity of the composite catalysts under visible-light region were tested and the influences of nitrogen content and calcinations temperature on the photo-catalytic activity were investigated. The results showed that (1) the modified composite catalyst light response range from UV to visible-light region, which results in a high visible-light photo-catalytic activity in the degradation of methyl orange. (2) Through the mechanism of photo-catalytic reaction and the treatment effect analysis, MnO2 as catalytic resulting O2 can serve as a good electronic capture agent and improve the efficiency of reaction. (3) With the reduction of nitrogen content, and the increase in calcinations temperature, the visible-light photo-catalytic activity weakens. (4) The activity of catalyst was reused for six times, did not significantly reduced and has excellent efficiency and stability.
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References
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References
K. Vinodgopal and P.V. Kamat, Environ. Sci. Technol., 29, 841 (1995); https://doi.org/10.1021/es00003a037.
J.W. Ji, Chin. Sci. Bull., 48, 680 (2003); https://doi.org/10.1360/03tb9146.
W.H. Yuan, H.Q. Bi, C.H. Wei, J. South China Univ. Technol., 32, 29 (2004).
S. Yi, H. Yamaki and Q.W. Zhang, Solid State Ion., 172, 139 (2004); https://doi.org/10.1016/j.ssi.2004.04.031.
C.H. Ao and S.C. Lee, Appl. Catal. B, 44, 191 (2003); https://doi.org/10.1016/S0926-3373(03)00054-7.
X.Y. Chen, S.L. Liu, X. Chen, Acta Phys. Chim. Sin., 22, 517 (2006).
C.Y. Lin and R.C. Dunbar, J. Phys. Chem., 98, 1369 (1994); https://doi.org/10.1021/j100056a001.
R. Asahi, T. Morikawa, T. Ohwaki, Science, 293, 269 (2001); https://doi.org/10.1126/science.1061051.
C. Burda, Y. Lou, X. Chen, A.C.S. Samia, J. Stout and J.L. Gole, Nano Lett., 3, 1049 (2003); https://doi.org/10.1021/nl034332o.