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2011 | 185 | 1 | 227-235
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Mechanistic pathways differences between P25-TiO2 and Pt-TiO2 mediated CV photodegradation

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The Crystal Violet (CV) dye represented one of the major triphenylmethane dyes used in textile-processing and some other industrial processes. Various metals doped titanium dioxide (TiO 2 ) photocatalysts have been studied intensively for the photodegradation of dye in wastewater treatment. In order to understand the mechanistic detail of the metal dosage on the activities enhancement of the TiO 2 based photocatalyst, this study investigated the CV photodegradation reactions under UV light irradiation using a Pt modified TiO 2 photocatalyst. The results showed that Pt-TiO 2 with 5.8% (W/W) Pt dosage yielded optimum photocatalytic activity. Also the effect of pH value on the CV degradation was well assessed for their product distributions. The degradation products and intermediates were separated and characterized by HPLC–ESI-MS and GC–MS techniques. The results indicated that both the N-de-methylation reaction and the oxidative cleavage reaction of conjugated chromophore structure occurred, but with significantly different intermediates distribution implying that Pt doped TiO 2 facilitate different degradation pathways compared to the P25-TiO 2 system.
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  • Department of Environmental Engineering, Hung Kung University, Taichung Shien 433, Taiwan, ROC
  • Department of General Education, National Taichung Nursing College, Taichung 403, Taiwan, ROC
  • Department of Occupational Safety and Health, Chung-Shan Medical University, Taichung 402, Taiwan, ROC
  • Department of Environmental Engineering, Hung Kung University, Taichung Shien 433, Taiwan, ROC
  • Department of Science Application and Dissemination, National Taichung University of Education, Taichung 403, Taiwan, ROC ,
  • 1. Ullmann's Encyclopedia of Industrial Chemistry. Part A27. Triarylmethane and Diarylmethane Dyes. 6th Ed., Wiley-VCH, New York, 2001.
  • 2. Baptista, M.S.& Indig, G.L., "Effect of BSA binding on photophysical and photochemical properties of triarylmethane dyes", J. Phys. Chem. B, vol. 102, 1998, p.4678-4688
  • 3. Bhasikuttan, A.C.& Sapre, A.V.& Shastri, L.V., "Photoinduced electron transfer in crystal violet (CV+)-bovine serum albumin (BSA) system: evaluation of reaction paths and radical intermediates", J. Photochem. Photobiol. A: Chem., vol. 150, 2002, p.59-66
  • 4. Lewis, L.M.& Indig, G.L., "Effect of dye aggregation on triarylmethane-mediated photoinduced damage of hexokinase and DNA", J. Photochem. Photobiol. B: Biol., vol. 67, 2002, p.139-148
  • 5. Bonnett, R.& Martinez, G., "Photobleaching of sensitisers used in photodynamic therapy", Tetrahedron, vol. 57, 2001, p.9513-9547
  • 6. Cho, B.P.& Yang, T.& Blankenship, L.R.& Moody, J.D.& Churchwell, M.& Bebland, F.A.& Culp, S.J., "Synthesis and characterization of N-demethylated metabolites of Malachite Green and Leucomalachite Green", Chem. Res. Toxicol., vol. 16, 2003, p.285-294
  • 7. Thompson, T.L.& Yates, J.T., "Surface science studies of the photoactivation of TiO2—new photochemical processes", Chem. Rev., vol. 106, 2006, p.4428-4453
  • 8. Carp, O.& Huisman, C.L.& Reller, A., "Photoinduced reactivity of titanium dioxide", Prog. Solid State Chem., vol. 32, 2004, p.33-177
  • 9. Tang, J.& Durrant, J.R.& Klug, D.R., "Mechanism of photocatalytic water splitting in TiO2. Reaction of water with photoholes, importance of charge carrier dynamics, and evidence for four-hole chemistry", J. Am. Chem. Soc., vol. 130, 2008, p.13885-13891
  • 10. May, R.A.& Patel, M.N.& Johnston, K.P.& Stevenson, K.J., "Flow-based multiadsorbate ellipsometric porosimetry for the characterization of mesoporous Pt-TiO2 and Au-TiO2 nanocomposites", Langmuir, vol. 25, 2009, p.4498-4509
  • 11. Du, P.& Schneider, J.& Li, F.& Zhao, W.& Patel, U.& Castellano, F.N.& Eisenberg, R., "Bi-terpyridyl platinum(II) chloro complexes: molecular catalysts for the photogeneration of hydrogen from water or simply precursors for colloidal platinum", J. Am. Chem. Soc., vol. 130, 2008, p.5056-5058
  • 12. Ren, M.& Ravikrishna, R.& Valsaraj, K.T., "Photocatalytic degradation of gaseous organic species on photonic band-gap titania", Environ. Sci. Technol., vol. 40, 2006, p.7029-7033
  • 13. Hensel, J.& Wang, G.& Li, Y.& Zhang, J.Z., "Synergistic effect of CdSe quantum dot sensitization and nitrogen doping of TiO2 nanostructures for photoelectrochemical solar hydrogen generation", Nano Lett., vol. 10, 2010, p.478-483
  • 14. Fu, X.& Zeltner, W.A.& Anderson, M.A., "The gas-phase photocatalytic mineralization of benzene on porous titania-based catalysts", Appl. Catal. B: Environ., vol. 6, 1995, p.209-224
  • 15. Falconer, J.L.& Magrini-Bair, K.A., "Photocatalytic and thermal catalytic oxidation of acetaldehyde on Pt/TiO2", J. Catal., vol. 179, 1998, p.171-178
  • 16. Nosaka, Y.& Koenuma, K.& Ushida, K.& Kira, A., "Reaction mechanism of the decomposition of acetic acid on illuminated TiO2 powder studied by means of in Situ electron spin resonance measurements", Langmuir, vol. 12, 1996, p.736-738
  • 17. Jin, Z.& Chen, Z.& Li, Q.& Xi, C.& Zheng, X., "On the conditions and mechanism of PtO2 formation in the photoinduced conversion of H2PtCl6", J. Photochem. Photobiol. A: Chem., vol. 81, 1994, p.177-182
  • 18. Vorontsov, A.V.& Savinov, E.N.& Jin, Z., "Influence of the form of photodeposited platinum on titania upon its photocatalytic activity in CO and acetone oxidation", J. Photochem. Photobiol. A: Chem., vol. 125, 1999, p.113-117
  • 19. Ishibai, Y.& Sato, J.& Akita, S.& Nishikawa, T.& Miyagishi, S., "Photocatalytic oxidation of NOx by Pt-modified TiO2 under visible light irradiation", J. Photochem. Photobiol. A: Chem., vol. 188, 2007, p.106-111
  • 20. Zhao, W.& Chen, C.& Li, X.& Zhao, J.& Hidaka, H.& Serpone, N., "Photodegradation of sulforhodamine-B dye in platinized titania dispersions under visible light irradiation: influence of platinum as a functional Co-catalyst", J. Phys. Chem. B, vol. 106, 2002, p.5022-5028
  • 21. Park, H.& Choi, W., "Photocatalytic reactivities of nafion-coated TiO2 for the degradation of charged organic compounds under UV or visible light", J. Phys. Chem. B, vol. 109, 2005, p.11667-11674
  • 22. Hu, X.& Mohamood, T.& Ma, W.& Chen, C.& Zhao, J., "Oxidative decomposition of Rhodamine B dye in the presence of VO2+ and/or Pt(IV) under visible light irradiation: N-deethylation, chromophore oxidative cleavage reaction, and mineralization", J. Phys. Chem. B, vol. 110, 2006, p.26012-26018
  • 23. Chen, C.C.& Lu, C.S., "Mechanistic studies of the photocatalytic degradation of Methyl Green: an investigation of products of the decomposition processes", Environ. Sci. Technol., vol. 41, 2007, p.4389-4396
  • 24. Chen, C.C.& Fan, H.J.& Jan, J.L., "Degradation pathways and efficiencies of Acid Blue 1 by photocatalytic reaction with ZnO nanopowder", J. Phys. Chem. C, vol. 112, 2008, p.11962-11972
  • 25. Siemon, U.& Bahnemann, D.& Testa, J.J.& Rodriguez, D.& Litter, M.I.& Bruno, N., "Heterogeneous photocatalytic reactions comparing TiO2 and Pt/TiO2", J. Photochem. Photobiol. A: Chem., vol. 148, 2002, p.247-255
  • 26. Vorontsov, A.V.& Stoyanova, I.V.& Kozlov, D.V.& Simagina, V.I.& Savinov, E.N., "Kinetics of the photocatalytic oxidation of gaseous acetone over platinized titanium dioxide", J. Catal., vol. 189, 2000, p.360-369
  • 27. Vorontsov, A.V.& Savinov, E.N.& Jin, Z., "Influence of the form of photodeposited platinum on titania upon its photocatalytic activity in CO and acetone oxidation", J Photochem Photobiol A: Chem., vol. 125, 1999, p.113-117
  • 28. Li, F.B.& Li, X.Z., "The enhancement of photodegradation efficiency using Pt-TiO2 catalyst", Chemosphere, vol. 48, 2002, p.1103-1111
  • 29. Driessen, M.D.& Grassian, V.H., "Photooxidation of trichloroethylene on Pt/TiO2", J. Phys. Chem. B, vol. 102, 1998, p.1418-1423
  • 30. Abe, R.& Takami, H.& Murakami, N.& Ohtani, B., "Pristine simple oxides as visible light driven photocatalysts: highly efficient decomposition of organic compounds over platinum-loaded tungsten oxide", J. Am. Chem. Soc., vol. 130, 2008, p.7780-7781
  • 31. Dunn, W.W.& Aikawa, Y.& Bard, A.J., "Characterization of particulate titanium dioxide photocatalysts by photoelectrophoretic and electrochemical measurements", J. Am. Chem. Soc., vol. 100, 1981, p.3456-3459
  • 32. Chen, C.C.& Lu, C.S., "Photocatalytic degradation of Basic Violet 4: degradation efficiency, product distribution, and mechanisms", J. Phys. Chem. C, vol. 111, 2007, p.13922-13932
  • 33. Ma, Y.S.& Chang, C.N.& Chiang, Y.P.& Sung, H.F.& Chao, A.C., "Photocatalytic degradation of lignin using Pt/TiO2 as the catalyst", Chemosphere, vol. 71, 2008, p.998-1004
  • 34. Murakami, N.& Prieto Mahaney, O.P.& Abe, R.& Torimoto, T.& Ohtani, B., "Double-beam photoacoustic spectroscopic studies on transient absorption of titanium(IV) oxide photocatalyst powders", J. Phys. Chem. C, vol. 111, 2007, p.11927-11935
  • 35. Kormann, C.& Bahnemann, D.& Hofmann, M.R., "Photocatalytic production of hydrogen peroxides and organic peroxides in aqueous suspensions of titanium dioxide, zinc oxide, and desert sand", Environ. Sci. Technol., vol. 22, 1988, p.798-806
  • 36. Mrowetz, M.& Balcerski, W.& Colussi, A.J.& Hoffmann, M.R., "Oxidative power of nitrogen-doped TiO2 photocatalysts under visible illumination", J. Phys. Chem. B, vol. 108, 2004, p.17269-17273
  • 37. Hirakawa, T.& Nosaka, Y., "Properties of O2− and OH formed in TiO2 aqueous suspensions by photocatalytic reaction and the influence of H2O2 and some ions", Langmuir, vol. 18, 2002, p.3247-3254
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