Abstract
In this research, the photocatalytic degradation of 4-chlorophenol (4-CP) in TiO2 aqueous suspension was studied. TiO2 photocatalysts were prepared by sol-gel method. The dominant anatase-structure on TiO2 particles was observed after calcining the TiO2 gel at 500 °C for 1 hr. Photocatalysts with various transition metals (Fe, Cu, Nd, Pd and Pt) loading were tested to evaluate the effect of transition metal impurities on photodegradation. The photocatalytic degradation in most cases follows first-order kinetics. The maximum photodegradation efficiency was obtained with TiO2 dosage of 0.4 g/L, retention time of 1 min and air flow rate of 2,500 cc/min. The photodegradation efficiency with Pt-TiO2 or Pd-TiO2 is higher than pure TiO2 powder. The optimal content value of Pt and Pd is 2 wt%. However, the photodegradation efficiency with Fe(1.0 wt%)-TiO2 and Cu(1.0 wt%)-TiO2 is lower than pure TiO2 powder.
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Bideau, M., Claudel, B., Faure, L. and Kazouan, H., “The Photo-oxidation of Propionic Acid by Oxygen in the Presence of TiO2 and Dissolved Copper Ions,”J. Photochem. Photobiol. A: Chem.,67, 337 (1992).
Brezova, V., Blazkova, A., Borosova, E., Ceppan, M. and Fiala, R., “The Influence of Dissolved Metal Ions on the Photocatalytic Degradation of Phenol in Aqueous TiO2 Suspensions,”J. Mole. Catal. A: Chem.,98, 109 (1995).
Chen, D. and Ray, A. K., “Photodegradation Kinetics of 4-Nitrophenol in TiO2 Suspension,”Wat. Res.,32, 3223 (1998).
Ekabi, H. A. and Serpone, N., “Kinetics Studies in Heterogeneous Photocatalysis. I. Photocatalytic Degradation of Chlorinated Phenols in Aerated Aqueous Solutions over Titania Supported on a Glass Matrix,”J. Phys. Chem.,92, 5726 (1988).
Kim, J. P., “Effect of Palladium and Nickel on the Temperature Programmed Reduction of Metal Oxides and Metal Oxide Layers,”Korean J. Chem. Eng.,21(2), 385 (2004).
Ku, Y., Leu, R.M. and Lee, K. C., “Decomposition of 2-Chlorophenol in Aqueous Solution by UV Irradiation with the Presence of Titanium Dioxide,”Wat. Res.,30, 2569 (1996).
Lee, B.Y., Park, S. H., Lee, S. C., Kang, M., Park, C. H. and Choung, S. J., “Optical Properties of Pt-TiO2 Catalyst and Photocatalytic Activities for Benzene Decomposition,”Korean J. Chem. Eng.,20(5), 812 (2003).
Li, F. B. and Li, X. Z., “The Enhancement of Photodegradation Efficiency Using Pt-TiO2 Catalyst,”Chemosphere,48, 1103 (2002).
Linsebigler, A. L., Lu, G. and Yates, J. T., “Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results,”Chem. Rev.,95, 735 (1995).
Matthews, R.W., “Photooxidation of Organic Impurities in Water Using Thin Films of Titanium Dioxide,”J. Phys. Chem.,91, 3328 (1987).
Moonsiri, M., Rangsunvigit, P., Chavadej, S. and Gulari, E., “Effects of Pt and Ag on the Photocatalytic Degradation of 4-Chlorophenol and its By-products,”Chem. Eng. J.,97, 241 (2004).
Sclafani, A. and Herrmann, J.M., “Comparison of the Photoelectronic and Photocatalytic Activities of Various Anatase and Rutile Forms of Titania in Pure Liquid Organic Phases and in Aqueous Solutions,”J. Phys. Chem.,100, 13655 (1996).
Theurich, J., Lindner, M. and Bahnemann, D.W., “Photocatalytic Degradation of 4-Chlorophenol in Aerated Aqueous Titanium Dioxide Suspensions: A Kinetic and Mechanistic Study,”Langmuir,12, 6368 (1996).
Wu, C., Yue, Y., Deng, X., Hua, W. and Gao, Z., “Investigation on the Synergetic Effect Between Anatase and Rutile Nanoparticles in Gasphase Photocatalytic Oxidations,”Catal. Today,93-95, 863 (2004).
Zhang, T., Oyama, T. K., Horikoshi, S., Hidaka, H., Zhao, J. and Serpone, N., “Photocatalyzed N-Demethylation and Degradation of Methylene Blue in Titania Dispersions Exposed to Concentrated Sunlight,”Sol. Ener. Mater. & Sol. Cells,73, 287 (2002).
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Kim, IK., Ha, HJ., Lee, SK. et al. Degradation of chlorophenol by photocatalysts with various transition metals. Korean J. Chem. Eng. 22, 382–386 (2005). https://doi.org/10.1007/BF02719415
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DOI: https://doi.org/10.1007/BF02719415