한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제21권1호
  • /
  • Pages.84-91
  • /
  • 2005
  • /
  • 2289-0971(pISSN)
  • /
  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
권호 표지

TiO2/UV-A 시스템을 이용한 Cu(II)-EDTA의 광촉매 산화반응에서 TiO2 재사용 및 회수

TiO2 Reuse and Recovery from the Photocatalytic Oxidation of Cu(II)-EDTA using TiO2/UV-A System

  • Lee, Seung-Mok (Division of Civil and Environmental Engineering, Kwandong University)
  • 투고 : 2004.11.29
  • 심사 : 2004.12.10
  • 발행 : 2005.01.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

$TiO_2-catalyst$ suspensions work efficiently in Photocatalytic oxidation (PCO) for wastewater treatment. Nevertheless, once photocatalysis is completed, separation of the catalyst from solution becomes the main problem. The PCO of Cu(II)-EDTA was studied to determine the reusability of the titanium dioxide catalyst. Aqueous solutions of $10^{-4}M$ Cu(II)-EDTA were treated using illuminated $TiO_2$ particles at pH 6 in a circulating reactor. $TiO_2$ was reused in PCO system for treatment of Cu(II)-EDTA comparing two procedures: reuse of water and $TiO_2$ and reuse of the entire suspension after PCO of Cu(II)-EDTA. The results are as follows; (i) Photocatalytic efficiency worsens with successive runs when catalyst and water are reused without separation and filtration, whereas, when $TiO_2$ is separated from water, the reused $TiO_2$ is not deactivated. (ii) The $TiO_2$ mean recovery (%) with reused $TiO_2$ was 86.4%(1.73g/L). Although the mean initial degradation rate of Cu(II)-EDTA and Cu(II) was lower than that using fresh $TiO_2$, there was no significant change in the rate during the course of the three-trial experiment. It is suggested that Cu(II)-EDTA could be effectively treated using an recycling procedure of PCO and catalyst recovery. (iii) However, without $TiO_2$ separation, the loss of efficiency of the PCO in the use of water and $TiO_2$ due to Cu(II), DOC remained from previous degradation and Cu(II)-EDTA added to the same suspension was observed after 2 trials, and resulted in the inhibition of the Cu(II)-EDTA, Cu(II) and DOC destruction.

키워드

과제정보

연구 과제 주관 기관 : 한국과학재단

참고문헌

  1. Arana, J., Tello Rendon, E., Dona Rodriguez, J. M., Herrera Melian, J. A., Gonzalez Diaz, O., and Perez Pena, J., High concentrated phenol and 1.2-propylene glycol water solutions treatment by photocatalysis: Catalyst recovery and reuse, Applied Catalysis B, 30(1-2), pp. 1-12 (2001) https://doi.org/10.1016/S0926-3373(00)00218-6
  2. Arana, J., Herrera Melian, J. A., Dona Rodriguez, J, M., Gonzalez Diaz, O., Viera, A., Perez Pena, J., Marrero Sosa, P. M., and Espino Jimenez, V., $TiO_2$-photocatalysis as a tertiary treatment of naturally treated wastewater, Catlysis Today, 76(2), pp. 279-289 (2002) https://doi.org/10.1016/S0920-5861(02)00226-2
  3. Davis, A. P. and Green, D. L., Photocatalytic oxidation of Cadmium-EDTA with titanium dioxide, Environ. Sci. Technol., 33(4), pp. 609-617 (1999) https://doi.org/10.1021/es9710619
  4. Femandez-Ibanez, P., Blanco, J., Malato, S., and de las Nieves, F. J., Application of the colloidal stability of $TiO_2$ particles for recovery and reuse in solar photocatalysi, Wat. Res., 37(13), pp. 3180-3188 (2003) https://doi.org/10.1016/S0043-1354(03)00157-X
  5. Foster, N. S., Noble, R. D., and Koval, C. A., Reversible photoreductive deposition and oxidative dissolution of copper ions in titanium dioxide aqueous suspensions, Environ. Sci. Technol., 27(2), pp. 350-356 (1993) https://doi.org/10.1021/es00039a016
  6. Hoffmann, M. R, Martin, S. T., Choi, W., and Bahnemann, D. W., Environmental applications of semiconductor photocatalysis, Chem. Rev., 95(1), pp 69-96 (1995) https://doi.org/10.1021/cr00033a004
  7. Matthews, R W., Photo-Oxidation of organic material in aqueous suspensions of titanium dioxide, Water Res., 20(5), pp. 569-578 (1986) https://doi.org/10.1016/0043-1354(86)90020-5
  8. Madden, T., Datye, A. K., Fulton, M., Prairie, M. R, Majumdar, S. A., and Stange, B. M., Oxidation of metal-EDTA complexes by $TiO_2$ photocatalysis, Environ. Sci. Technol., 31(12), pp. 3475-3481 (1997) https://doi.org/10.1021/es970226a
  9. Means, J. L.. Crerar, D. A., and Duguid, J. O., Migration of radioactive wastes radionuclide mobilization by complexing agents, Science, 200(4349), pp. 1477-1481 (1978) https://doi.org/10.1126/science.200.4349.1477
  10. Prairie, M. R., Evans, L. R., Stange, B. M., and Martinez, S. L., An investigation of $TiO_2$ photocatalysis for the treatment of water contaminated with metals and organic chemicals, Environ. Sci. Technol., 27(9), pp. 1776-1782 (1993) https://doi.org/10.1021/es00046a003
  11. Riley, R. G., Zachara, J. M., and Wobber, F. J., Chemical contaminants on DOE lands and selection of contaminant mixtures for subsurface science research, Us. Department of Energy, DOE/ER-0547T, April (1992)
  12. Sun, Y. and Pignatello, I. J., Evidence for a surface dual hole-radical mechanism in the $TiO_2$ photocatalytic oxidation of 2,4-dichlorophenoxyacetic acid, Environ. Sci. Technol., 30(6), pp. 1975-1981 (1996) https://doi.org/10.1021/es950715f
  13. Turchi. C. S. and Ollis, D. F., Photocatalytic degradation of organic water contaminants mechanisms involving hydroxyl radical attack, J. Catal., 122(1), pp. 178-192 (1990) https://doi.org/10.1016/0021-9517(90)90269-P
  14. Yang, J. K. and Davis, A. P., Competitive adsorption of Cu(II)-EDTA and Cd(II)-EDTA onto $TiO_2$ J. Colloid and Interface Science, 216(1), pp. 77-85 (1999) https://doi.org/10.1006/jcis.1999.6278
  15. Yang, J. K. and Davis, A. P., Photocatalytic oxidation of Cu(II)-EDTA with illuminated $TiO_2$: Kinetics, Environ. Sci. Technol., 34(17), pp. 3789-3795 (2000) https://doi.org/10.1021/es990874p