Influences of Rare-Earth Ions Doping on the Structure and Photocatalytic Activity of TiO₂

Abstract:

Rare-earth (RE)-doped TiO₂ photocatalysts were prepared by doping samarium ions into TiO₂ nanoparticles in a sol-gel process. The samples were characterized using X-ray diffraction (XRD). Their photocatalytic activities were evaluated by photodegradation of methyl orange (MO) in water under UV light irradiation. Finally, influences of rare-earth ions doping on the structure and photocatalytic activity of TiO₂ were studied using grey correlation analysis method based on multi-variable grey model. The experimental results indicated that the doping modifications of TiO₂ work through the structure change in nanoscale, leading to the change of activities. It was also found that the main actors influencing on activity of RE-doped TiO₂ are crystalline size (D) and crystal constant (a) for the MO photodegradation base on the grey relational analysis method. Using the same method above, the activities of RE-doped TiO₂ photocatalysts could be predicted and doping concentration need to be optimized.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 151-155
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.151
• Online since: December 2011
• Authors: Feng Li, He Bian, Jing Tang Zheng, Yan Hu
• Keywords: Degradation, Grey Relational Analysis Method, Photocatalytic Activity, Rare-Earth Ions, Sol-Gel Preparation, TiO₂

References

[1] Awati P S, Awate S V, Shah P P, et al. Catal Commun., 2003, 4: 393-400.

[2] Sethikumaar S, Porkodi K Photochem Photobiol A: Chem., 2005, 170(3): 225-232.

[3] Y. Matsumoto, M. Murakami, T. Shono, T. Hasegawa, T. Fukumura, M. Kawasaki, P. Ahmet, T. Chikyow, S. Koshihara and H. Koinuma1: Science. Vol. 291 (2001), p.854.

DOI: 10.1126/science.1056186

[4] Li F B, Li X Z, Ao C H, et al. Chemoshere, 2005，59(6)：787-800.

[5] H. Kim, D. C. Gilmer, S. A. Campbell and D. L. Polla: Appl. Phys. Lett. Vol. 69 (1996), p.3860.

[6] A. Fujishima: Nature. Vol. 238 (1972), p.37.

[7] L.Y. Hu, H.W. Song, G H. Pan, B. Yan, R.F. Qin, Q.L. Dai, L.B. Fan, S.W. Li and X. Bai: J. Lumin. Vol. 127 (2007), p.371.

[8] CHEN En-wei, YIN Dong-hong, SONG Hui-juan, et al. Chinese journal of catalysis, 2006，27(4)：344-348.

[9] J.W. Shi, J.T. Zheng, Y. Hu and Y.C. Zhao: Environ. Eng. Sci. 25 (2008), p.489.

[10] V. Kiisk, I. Sildos and S. Lange: Appl. Surf. Sci. Vol. 247 (2005) p.412.

[11] S. Lange, I. Sildos, V. Kiisk: Mater. Sci. Eng. B. Vol. 112 (2004) p.87.

[12] V. Reedo, S. Lange, V. Kiisk: Proc. SPIE. Vol. 5946 (2006) p. 59460F-1.

[13] C. C. Ting and S. Y. Chen: J. Appl. Phys. Vol. 90 (2001) p.5564.

[14] R. Palomino-Merino and A. Conde-Gallardo: Thin Solid Films. Vol. 401 (2001) p.118.

[15] J. Ovenstone, P. J. Titler and R. Withnall: J. Phys. Chem. B. Vol. 105 (2001) p.7170.

[16] C. W. Jia, E.Q. Xie and J.G. Zhao: J. Appl. Phys. Vol. 100 (2005) p.023529.

[17] K. L. Frindell and M.H. Bartl: J. Solid State Chem. Vol. 172 (2003) p.81.

[18] K. L. Frindell, M.H. Bartl and A. Popitsch: Angew. Chem. Int. Ed. Vol. 41 (2002) p.959.

[19] A. Conde-Gallardoa and M. García-Rocha: Appl. Surf. Sci. Vol. 212 (2003) p.583.

[20] F. B. Li, X. Z. Li and M. F. Hou: Appl. Catal. B: Environ. Vol. 48 (2003) p.185.

[21] Y. Xie, C. Yuan and X. Li: Colloids and Surface A Vol. 252 (2005) p.87.

[22] J. L. Deng: J. Grey Syst. Vol. 1 (1989) p.1.

[23] J. L. Deng: Grey Prediction and Grey Decision (Press of Huazhong University of Science & Technology, Wuhan 2002).

[24] Y. An and Q. X. Wu. Comput. Appl. Chem. (In Chinese). Vol. 23 (2006) p.186.