Degradation of Gaseous Trichloroethylene Over a Thin-Film TiO2 Photocatalyst

Sang Bum Kim; Gyung Soo Kim; Sung Chang Hong

Journal of Industrial and Engineering Chemistry, Vol.12, No.5, 749-756, September, 2006

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Degradation of Gaseous Trichloroethylene Over a Thin-Film TiO2 Photocatalyst

Sang Bum Kim^†, Gyung Soo Kim, and Sung Chang Hong¹

Green Chemistry Team, Environment and Energy Division, Korea Institute of Industrial Technology (KITECH), Cheonan-si, Choongnam 330-825, Korea
¹Department of Environmental Engineering, Kyonggi University, Suwon-si, Kyonggi-do 442-760, Korea

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Photocatalytic degradation (PCD) of gaseous trichloroethylene (TCE) over thin-film TiO2 was examined in a continuous flow system with regard to the mixing condition of the baffle, the inlet concentration of TCE, and the face velocity of the gas flow. The effect of mixing with the baffle on the PCD rate of TCE was found to be positive under conditions of a simultaneous low inlet concentration and a high face velocity. It was found that the effect of mixing could be improved by installation of a baffle, based on the tanks-in-series and dispersion models using residence time distribution (RTD) data in the existence of a baffle. The baffles exhibited continuous-stirred tank reactor (CSTR) behavior in the reactor. The PCD rate continuously increased linearly with the TCE inlet concentration, regardless of the tendency of the Langmuir-Hinshelwood (L-H) kinetics. The face velocity also increased the PCD rate. In the long run, it could be concluded that the PCD rate of TCE may be controlled by mass transfer.

Keywords:photocatalytic degradation rate;trichloroethylene;mass transfer control;surface reaction control;continuous flow system

[References]

Meyers RA, encyclopedia of environmental analysis and remediation, p. 2191, John Wiley & Sons, New York (1998)
Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)
Linsebigler AL, Lu GQ, Yates JT, Chem. Rev., 95(3), 735 (1995)
Litter MI, Appl. Catal. B: Environ., 23(2-3), 89 (1999)
Dibble LA, Raupp GB, in Proceedings of the Arizona Hydrological Society, First Annual Symposium, September 16-17, 1988, pp. 221-229, Phoenix, Arizona (1988)
Dibble LA, Raupp GB, Environ. Sci. Technol., 26, 492 (1992)
Anderson MA, Yamazakinishida S, Salvador CM, in Photocatalytic Purification and Treatment of Water and Air, pp. 405-418, Elsevier Science Publisher (1993)
Fogler HS, Elements of Chemical Reaction Engineering, 3rd Edn., pp. 821-887, Prentice Hall, Englewood Cliffs, NJ (1999)
Jacoby WA, Blake DM, Noble RD, Koval CA, J. Catal., 157(1), 87 (1995)
Obee TN, Brown RT, Environ. Sci. Technol., 29, 1223 (1995)
Obee TN, Hay SO, Environ. Sci. Technol., 31, 2034 (1997)
Cao LX, Huang AM, Spiess FJ, Suib SL, J. Catal., 188(1), 48 (1999)
Perry RH, Green DW, Maloney JO, perry’s chemical engineering’ handbook, 2nd Edn., pp.11-26, McGraw Hill, Singapore (1984)

[Referenced By]

[Related Articles]

[1] Meyers RA, encyclopedia of environmental analysis and remediation, p. 2191, John Wiley & Sons, New York (1998)

[2] Hoffmann MR, Martin ST, Choi WY, Bahnemann DW, Chem. Rev., 95(1), 69 (1995)

[3] Linsebigler AL, Lu GQ, Yates JT, Chem. Rev., 95(3), 735 (1995)

[4] Litter MI, Appl. Catal. B: Environ., 23(2-3), 89 (1999)

[5] Dibble LA, Raupp GB, in Proceedings of the Arizona Hydrological Society, First Annual Symposium, September 16-17, 1988, pp. 221-229, Phoenix, Arizona (1988)

[6] Dibble LA, Raupp GB, Environ. Sci. Technol., 26, 492 (1992)

[7] Anderson MA, Yamazakinishida S, Salvador CM, in Photocatalytic Purification and Treatment of Water and Air, pp. 405-418, Elsevier Science Publisher (1993)

[8] Fogler HS, Elements of Chemical Reaction Engineering, 3rd Edn., pp. 821-887, Prentice Hall, Englewood Cliffs, NJ (1999)

[9] Jacoby WA, Blake DM, Noble RD, Koval CA, J. Catal., 157(1), 87 (1995)

[10] Obee TN, Brown RT, Environ. Sci. Technol., 29, 1223 (1995)

[11] Obee TN, Hay SO, Environ. Sci. Technol., 31, 2034 (1997)

[12] Cao LX, Huang AM, Spiess FJ, Suib SL, J. Catal., 188(1), 48 (1999)

[13] Perry RH, Green DW, Maloney JO, perry’s chemical engineering’ handbook, 2nd Edn., pp.11-26, McGraw Hill, Singapore (1984)