Feasibility of Hydrothermal Nitrogen Doping Process for Enhancing Visible Light Photocatalytic Activity of Metatitanic Acid Powder

Abstract:

Wide band-gap photocatalyst is active only under UV light irradiation. Nitrogen doping into photocatalyst is able to extend the light absorption to the visible light region, allowing more solar energy to be utilized in photocatalytic applications. The hydrothermal process is widely applied for the preparation of nitrogen-doped TiO₂. The hydrothermal method is attractive for its simplicity and environment friendly conditions. Metatitanic acid (MTA) is an industrially available intermediate product in sulfate process for TiO₂ production, which is mesoporous material with large specific surface area and pore volume. In this work, MTA powder was hydrothermally treated with three types of nitrogen sources (urea, hexamethylenetetramine, and ammonium hydroxide) and subsequently heat-treated in N₂ flow. The results of UV-Vis diffuse reflection spectra and XPS show that it is possible to dope the nitrogen dopant into MTA by the hydrothermal process and the post-heat treatment. Higher photocatalytic activity in photodegrading rhodamine B dye under visible light was obtained when processed in ammonium hydroxide (MTA-A), but weaker in the samples of urea (MTA-U) and hexamethylenetetramine (MTA-H).

• Periodical: Materials Science Forum (Volume 761)
• Pages: 41-45
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.761.41
• Online since: July 2013
• Authors: Se Keun Park, Ji Eun Woo, Hyun Ho Shin
• Keywords: Hydrothermal Process, Isible-Light Photodegradation, Metatitanic Acid, Nitrogen Doping, Photocatalyst

References

[1] A. Fujishima, K. Honda, Electrochemical photolysis of water at a semiconductor electrode, Nature 238 (1972) 37–38.

DOI: 10.1038/238037a0

[2] T. Ibusuki, K. Takeuchi, Removal of low concentration nitrogen oxides through photoassisted heterogeneous catalysis, J. Mol. Catal. 88 (1994) 93–102.

DOI: 10.1016/0304-5102(93)e0247-e

[3] M. R. Hoffmann, S.T. Martin, W.Y. Choi, D.W. Bahnemann, Environmental applications of semiconductor photocatalysis, Chem. Rev. 95 (1995) 69–96.

DOI: 10.1021/cr00033a004

[4] A. Fujishima, N.R. Tata, A.T. Donald, Titanium dioxide photocatalysis, J. Photochem. Photobiol. C: Photochem. Rev. 1 (2000) 1–21.

[5] R. Asahi, T. Morikawa, T. Ohwaki, K. Aoki, Y., Taga, Visible-light photocatalysis in nitrogen-doped titanium dioxide, Science 293 (2001) 269–271.

DOI: 10.1126/science.1061051

[6] A., Fujishima, X. Zhang, D.A. Tryk, TiO2 photocatalysis and related surface phenomena, Surf. Sci. Rep. 63 (2008) 515–582.

DOI: 10.1016/j.surfrep.2008.10.001

[7] A.V., Emeline, V.N., Kuznetsov, V.K., Rybchuk, N. Serpone, Visible-light-active titania photocatalysts: The case of N-doped TiO2s-properties and some fundamental issues, Int. J. Photoenergy 2008 (2008) 258394.

DOI: 10.1155/2008/258394

[8] M. Pelaez, N.T. Nolan, S.C. Pillai, M.K. Seery, P. Falaras, A.G. Kontos, P.S.M. Dunlop, J.W.J. Hamilton, J. Byrne, K. O'Shea, M.H. Entezari, D.D. Dionysiou, A review on the visible light active titanium dioxide photocatalysts for environmental applications. Appl. Catal. B: Environ. 125 (2012) 331–349.

DOI: 10.1016/j.apcatb.2012.05.036

[9] C. Di Valentin, G. Pacchioni, A. Selloni, S. Livraghi, E. Giamello, Characterization of paramagnetic species in N-doped TiO2 powders by EPR spectroscopy and DFT calculations, J. Phys. Chem. B 109 (2005), 11414–11419.

DOI: 10.1021/jp051756t

[10] J. Wang, D.N. Tafen, J.P. Lewis, Z. Hong, A. Manivannan, M. Zhi, M. Li, N. Wu, Origin of photocatalytic activity of nitrogen-doped TiO2 nanobelts, J. Am. Chem. Soc. 131 (2009) 12290–12297.

DOI: 10.1021/ja903781h

[11] Y. Aita, M. Komatsu, S. Yin, T. Sato, Phase-compositional control and visible light photocatalytic activity of nitrogen-doped titania via solvothermal process, J. Solid State Chem., 177 (2004) 3235–3238.

DOI: 10.1016/j.jssc.2004.04.048

[12] F. Peng, L. Cai, L. Huang, H. Yu, H. Wang, Preparation of nitrogen-doped titanium dioxide with visible-light photocatalytic activity using a facile hydrothermal method, Phys. Chem. Solids, 69 (2008) 1657–1664.

DOI: 10.1016/j.jpcs.2007.12.003

[13] M. D'Arienzo, R. Scotti, L. Wahba, C. Battochhio, E. Bemporad, A. Nale, F. Morazzoni, Hydrothermal N-doped TiO2: Explaining photocatalytic properties by electronic and magnetic identification of N active sites, Appl. Catal., B, 93 (2009) 149–155.

DOI: 10.1016/j.apcatb.2009.09.024

[14] X. Wang, T.-T. Lim, Effect of hexamethylenetetramine on the visible-light photocatalytic activity of C–N codoped TiO2 for bisphenol A degradation: evaluation of photocatalytic mechanism and solution toxicity, Appl. Catal., A, 399 (2011) 233–241.

DOI: 10.1016/j.apcata.2011.04.002

[15] C.-C. Hu, T.-C. Hsu, L.-H. Kao, One-step cohydrothermal synthesis of nitrogen-doped titanium oxide nanotubes with enhanced visible light photocatalytic activity, Int. J. Photoenergy, 2012 (2012) Article ID 391958.

DOI: 10.1155/2012/391958