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Received March 26, 2008
Accepted September 18, 2008
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Enhanced photocatalytic oxidation properties in Pt-TiO2 thin films by grounding
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Korea
Korean Journal of Chemical Engineering, March 2009, 26(2), 392-397(6), 10.1007/s11814-009-0066-1
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Abstract
The rates of formaldehyde and toluene photocatalytic oxidation with different initial concentrations over a Pt-TiO2 film were analyzed at both the grounded and non-grounded states. The photocatalytic oxidation rates at the grounded states were faster than in the non-grounded states under similar reaction conditions. The enhanced photocatalytic oxidation rates in the grounded state were attributed to the effective splitting of the electron-hole pairs as a result of the scavenging of photoexcited electrons through the ITO (indium tin oxide) glass to earth. The pseudo first order model showed good agreement with the experimentally obtained heterogeneous photocatalytic oxidation rates of formaldehyde and toluene.
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References
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Torimoto T, Okawa Y, Takeda N, Yoneyama H, J. Photochem. Photobiol. A, 103, 153 (1997)
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Hagfeldt A, Bjorksten U, Lindquist SE, Sol. Energy Mat. Sol. Cells, 27, 293 (1992)
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Sodergren S, Hagfeldt A, Olsson J, Lindquist SE, J. Phys. Chem., 98(21), 5552 (1994)
Fujishima A, Rao TN, Tryk DA, Electrochim. Acta, 45(28), 4683 (2000)
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Shiraishi F, Yamaguchi S, Ohbuchi Y, Chem. Eng. Sci., 58(3-6), 929 (2003)
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Timothy NO, Environ. Sci. Technol., 30, 3578 (1996)
Nam W, Kim JM, Han GY, Chemosphere, 4, 1019 (2002)
Coronado JM, Zorn ME, Tejedor-Tejedor I, Anderson MA, Appl. Catal. B: Environ., 43(4), 329 (2003)
Goswami DY, J. Solar Energy Eng., 119, 101 (1997)
Choi WY, Termin A, Hoffmann MR, J. Phys. Chem., 98(51), 13669 (1994)
