Preparation and Photocatalysis Property of P-N Coupled Photocatalyst CoO/CdS/TiO₂

Abstract:

In this paper, p-n coupled photocatalyst CoO/CdS/TiO₂ was prepared by method of impregnation. The structure and optical properties of CdS/TiO2 and CoO/CdS/TiO₂ were characterized by XRD, SEM, BET and UV–vis DRS. The photocatalytic activities of the photocatalysts were evaluated by photocatalytic degradation of methyl orange, and the effect of photocorrosion of CdS in CoO/CdS/TiO₂ was investigated by analyzing the cadmium concentration in the supernate collected after photocatalytic reactions. The results showed that p-n coupled photocatalyst CoO/CdS/TiO₂ not only showed higher efficiency in degradation of methyl orange than CdS/TiO₂, but also exhibited resistance against cadmium leakage under light irradiation. The mechanism of the photocorrosion-delaying by p–n junction was also discussed.

• Periodical: Advanced Materials Research (Volumes 512-515)
• Pages: 1677-1682
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.512-515.1677
• Online since: May 2012
• Authors: Fu Sheng Liu, Sheng Wang, Lian Lian Liu, Huan Du
• Keywords: CdS /TiO₂, CoO, Photocatalysis, P-N Coupled Semiconductor, Visible Light Irradiation

References

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

[2] F. Bosc, D. Edwards, N. Keller, V. Keller and A. Ayral: Thin Solid Films Vol. 495(2006), p.272

DOI: 10.1016/j.tsf.2005.08.361

[3] L. Wu, J. C. Yu and X. Z. Fu: Journal of Molecular Catalysis A: Chemical Vol. 244(2006), p.25

[4] J. R. Darwent and G. Porter: J. Chem. Soc. Chem. Commun. Vol. 4(1981), p.145

[5] M. Matsumura, Y. Sato and H. Tsubomura: J. Phys. Chem. Vol. 87(1983), p.3807

[6] M. Sathish, B. Viswanathan and R. P. Viwanath: International Journal of Hydrogen Energy Vol. 31(2006), p.891

[7] N. G. Dhere and A. H. Jahagirdar: Thin Solid Films Vol. 480-481(2005), p.462

[8] T. Wagner, T. Waitz, J. Roggenbuck, M. Fröba, C.-D. Kohl and M. Tiemann: Thin Solid Films Vol. 515(2007), p.8360

DOI: 10.1016/j.tsf.2007.03.021

[9] M.A. Gondal, A. Hameed, Z. H. Yamani and A. Suwaiyan: Applied Catalysis A: General Vol. 268(2004), p.159

[10] J. Nayak, S.N. Sahu, J. Kasuya and S. Nozaki: Applied Surface Science Vol. 254(2008), p.7215

[11] D. J. Fermıín, E. A. Ponomarev and L. M. Peter: Journal of Electroanalytical Chemistry Vol. 473(1999), p.192

[12] Y.-H. Yang, N. Ren, Y.-H. Zhang and Y. Tang: Journal of Photochemistry and Photobiology A: Chemistry Vol. 201(2009), p.111

[13] Y. Bessekhouad, D. Robert and J. V. Weber: Journal of Photochemistry and Photobiology A: Chemistry Vol. 163(2004), p.569

[14] S. F. Chen, S. J. Zhang, W. Liu and W. Zhao: Journal of Hazardous Materials Vol. 155(2008), p.320

[15] S. F. Chen, W. Zhao, W. Liu, H. Y. Zhang and X. L. Yu: Chemical Engineering Journal Vol. 155(2009), p.466

[16] S. F. Chen, W. Zhao, W. Liu and S. J. Zhang: Applied Surface Science Vol. 255(2008), p.2478

[17] Y. M. Wu, M. Y. Xing, J. L. Zhang and F. Chen: Applied Catalysis B: Environmental Vol. 97(2010), p.182

[18] S. F. Chen, W. Zhao, W. Liu, H. Y. Zhang, X. L. Yu and Y. H. Chen: Journal of Hazardous Materials Vol. 172(2009), p.1415