Photocatalytic Degradation of Methylene Blue Aqueous Solution under Visible Light Irradiation by Using N-Doped Titanium Dioxide


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N-doped TiO2 powders with high photocatalytic activity under visible-light irradiation have been prepared by calcining anatase nanocrystalline TiO2 powders and guanidine hydrochloride at 350 °C, 450 °C, 550 °C and 650 °C with the holding time ranged from 1.5 h to 3 h, respectively. The guanidine hydrochloride content was varied from 1 to 6 M for the experiments. XRD patterns indicate that all the powders are anatase crystalline phase. The specific surface area is 25~45 m2/g measured by BET method. XPS results show that N atoms were incorporated into the lattice of TiO2 and the amount of N doped in TiO2 is reached up to 8.26 at%. UV-Vis absorption spectra show that the absorption edge of the synthesized N-doped TiO2 powders, calcined at 350 °C for 2.5 h, has red-shifted well into visible region up to 700 nm. Degradation of methylene blue (MB) aqueous solution has been investigated by UV-Vis light spectrophotometer. The 400-mL 10 mg/L aqueous solution of methylene blue could be degraded completely with 4 g N-doped TiO2 within 4.5 h of visible light irradiation.



Key Engineering Materials (Volumes 336-338)

Edited by:

Wei Pan and Jianghong Gong




Y. H. Li et al., "Photocatalytic Degradation of Methylene Blue Aqueous Solution under Visible Light Irradiation by Using N-Doped Titanium Dioxide", Key Engineering Materials, Vols. 336-338, pp. 1972-1975, 2007

Online since:

April 2007




[1] A. Fujishima, K. Honda: Nature Vol. 238 (1972), p.37.

[2] M.R. Hoffmann, S.T. Martin, W. Choi and D.W. Bahnemannt: Chem. Rev. Vol. 95 (1995), p.69.

[3] A. Fujishima, K. Hashimoto and T. Watanabe: TiO2 Photocatalysis, Fundamentals and Applications (BKC, Inc., Japan 1999).

[4] W. Choi, A. Termin and M.R. Hoffmann: J . Phys. Chem. Vol. 98 (1994), p.13669.

[5] D. Dvoranová, V. Brezová, M. Mazúr and M.A. Malati: Applied Catalysis B: Environmental Vol. 37 (2002), p.91.

[6] R. Asahi, T. Morikawa, T. Ohwahi, K. Aoki and Y. Taga: Science Vol. 293 (2001), p.269.

[7] S. Yin, H. Yamaki, Q.W. Zhang, M. Komatsu, J.S. Wang, Q. Tang, F. Saito and T. Sato: Solid State Ionics Vol. 172 (2004), p.205.

[8] H. Irie, Y. Watanabe and K. Hashimoto: J. Phys. Chem. B Vol. 107 (2003), p.5483.