Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Effects of Anodic Voltages of Photcatalytic TiO2 and Doping in H2SO4 Solutions on the Photocatalytic Activity

광촉매 TiO2의 황산용액에서의 양극산화전압과 도핑이 광촉매 활성에 미치는 영향

  • Lee, Seung-Hyun (School of Advanced Materials Engineering, Kookmin University) ;
  • Oh, Han-Jun (Department of Materials Science, Hanseo University) ;
  • Chi, Choong-Soo (School of Advanced Materials Engineering, Kookmin University)
  • Received : 2012.06.26
  • Accepted : 2012.08.04
  • Published : 2012.08.27
Download PDF
⟨ Previous Next ⟩

Abstract

To compare the photocatalytic performances of titania for purification of waste water according to applied voltages and doping, $TiO_2$ films were prepared in a 1.0 M $H_2SO_4$ solution containing $NH_4F$ at different anodic voltages. Chemical bonding states of F-N-codoped $TiO_2$ were analyzed using surface X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the co-doped $TiO_2$ films was analyzed by the degradation of aniline blue solution. Nanotubes were formed with thicknesses of 200-300 nm for the films anodized at 30 V, but porous morphology was generated with pores of 1-2 ${\mu}m$ for the $TiO_2$ anodized at 180 V. The phenomenon of spark discharge was initiated at about 98 V due to the breakdown of the oxide films in both solutions. XPS analysis revealed the spectra of F1s at 684.3 eV and N1s at 399.8 eV for the $TiO_2$ anodized in the $H_2SO_4-NH_4F$ solution at 180 V, suggesting the incorporation of F and N species during anodization. Dye removal rates for the pure $TiO_2$ anodized at 30 V and 180 V were found to be 14.0% and 38.9%, respectively, in the photocatalytic degradation test of the aniline blue solution for 200 min irradiation; the rates for the F-N-codoped $TiO_2$ anodized at 30 V and 180 V were found to be 21.2% and 65.6%, respectively. From the results of diffuse reflectance absorption spectroscopy (DRS), it was found that the absorption edge of the F-N-codoped $TiO_2$ films shifted toward the visible light region up to 412 nm, indicating that the photocatalytic activity of $TiO_2$ is improved by appropriate doping of F and N by the addition of $NH_4F$.

Keywords

References

  1. R. W. Matthews, Water Res., 20, 569 (1986). https://doi.org/10.1016/0043-1354(86)90020-5
  2. B. O'Regan and M. Gratzel, Nature, 353, 737 (1991). https://doi.org/10.1038/353737a0
  3. J. M. Macak, H. Tsuchiya, A. Ghicov and P. Schmuki, Electrochem. Comm., 7, 1133 (2005). https://doi.org/10.1016/j.elecom.2005.08.013
  4. R. P. Vitiello, J. M. Macak, A. Ghicov, H. Tsuchiya, L. F. P. Dick and P. Schmuki, Electrochem. Comm., 8, 544 (2006). https://doi.org/10.1016/j.elecom.2006.01.023
  5. C. C. Yen, D. Y. Wang, M. H. Shih, L. S. Chang and H. C. Shih, Appl. Surf. Sci., 256, 6865 (2010). https://doi.org/10.1016/j.apsusc.2010.04.102
  6. K. I. Hadjiivanov and D. G. Klissurski, Chem. Soc. Rev., 25, 61 (1996). https://doi.org/10.1039/cs9962500061
  7. F. Ren, K. He, Y. Ling and J. Feng, Appl. Surf. Sci., 257, 9621 (2011). https://doi.org/10.1016/j.apsusc.2011.06.083
  8. H. J. Kim, K. J. Jeong and D. S. Bae, Kor. J. Mater. Res., 22(5), 249 (2012). https://doi.org/10.3740/MRSK.2012.22.5.249
  9. J. M. Macak and P. Schmuki, Electrochim. Acta, 52, 1258 (2006). https://doi.org/10.1016/j.electacta.2006.07.021
  10. M Saadoun, N Mliki, H Kaabi, K Daoudi, B Bessaïs, H Ezzaouia and R Bennaceur, Thin Solid Films, 405, 29 (2002). https://doi.org/10.1016/S0040-6090(01)01757-6
  11. S. Hotchandani and P. V. Kamat, J. Phys. Chem., 96, 6834 (1992).
  12. H. Gerischer, Electrocim. Acta, 35, 1677 (1990). https://doi.org/10.1016/0013-4686(90)87067-C
  13. Y. Su, X. Zhang, S. Han, X. Chen and L. Lei, Electrochem. Comm., 9, 2291 (2007). https://doi.org/10.1016/j.elecom.2007.06.038
  14. K. L. Choy and B. Su, J. Mater. Sci. Lett., 18, 943 (1999). https://doi.org/10.1023/A:1006682217672
  15. K. S. Raja, T. Gandhi and M. Misra, Electrochem. Comm., 9, 1069 (2007). https://doi.org/10.1016/j.elecom.2006.12.024
  16. S. Yin, H. Yamaki, M. Komatsu, Q. Zhang, J. Wang, Q. Tang, F. Saito and T. Sato, J. Mater. Chem., 13, 2996 (2003). https://doi.org/10.1039/b309217h
  17. Y. -R. Luo, Biophys. Chem., 83, 179 (1999).

Cited by

  1. An Overview: Recent Development of Titanium Oxide Nanotubes as Photocatalyst for Dye Degradation vol.2014, pp.1687-529X, 2014, https://doi.org/10.1155/2014/524135