Saturation Concentration of Gas Pollutants in Photocatalysis

Abstract:

Saturation behavior in photocatalysis is investigated for volatile organic carbons (VOCs) and ammonia by using a tubular photoreactor and TiO₂ nanoparticles, synthesized by a flame chemical vapor deposition (CVD) process. Degradation degree versus initial concentration shows that saturation behavior occurs at different initial concentrations for different gas pollutants. The saturation concentration is obtained by taking as the intersection of the level off part and the tangential line to the rapid change part from the curve of degradation degree versus initial concentration. The saturation concentration for benzene is as low as 0.063 mg/m³, and is up to 720mg/m³ for formaldehyde for TiO₂ nanoparticles synthesized by a flame CVD process.

• Periodical: Advanced Materials Research (Volume 924)
• Pages: 306-311
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.924.306
• Online since: April 2014
• Authors: Hong Yong Xie*, Chang Wen Ma, Zhi Guo Sun, Gui Lan Gao
• Keywords: Flame CVD, Gas Pollutants, Photocatalysis, Saturation Concentration, TiO₂ Nanoparticles

References

[1] P. Pichat, Photocatalytic degradation of pollutants in water and air: basic concepts and applications, in M.A. Tarr (ed. ), Chemical Degradation Methods for Wastes and Pollutants: Environmental and Industrial Applications, Basel: Marcel Dekker, Inc., New York, 2003, pp.77-119.

DOI: 10.1201/9780203912553.ch2

[2] O. Carp, C. L. Huisman, A. Reller, Photoinduced reactivity of titanium dioxide. Prog. in Solid State Chem. 32(2004)33-177.

[3] S.M. Gupta, M. Tripathi, A review of TiO2 nanoparticles. Chinese Science Bulletin. 56(2011)1639-1657.

[4] R. Miller, R. Fox, Treatment of organic contaminates in air by photocatalytic oxidation: a commercialization perspective. in D. F. Ollis and H. Al-Ekabi, (Eds. ), Photocatalytic Purification and Treatment of Water and Air, Elsevier, Amsterdam, 1993, pp.573-578.

[5] Y. Ku, C.M. Ma, Y.S. Shen, Decomposition of gaseous trichloroethylene in a photoreactor with TiO2-coated nonwoven fiber textile. Appl. Catal. B: Environ. 34 (2001)181-190.

DOI: 10.1016/s0926-3373(01)00216-8

[6] H.Y. Xie, Y.N. Zhang, Q.L. Xu, Photodegradation of VOCs by C_TiO2 nanoparticles produced by flame CVD process. J Nanosci. Nanotechnol. 10 (2010)5445-5450.

DOI: 10.1166/jnn.2010.1935

[7] Q. Geng, N. Chen, Photocatalytic degradation of a gaseous benzene-toluene mixture in a circulated photocatalytic reactor. Chem. Eng. Technol. 34(2011)400-408.

DOI: 10.1002/ceat.201000195

[8] H.Y. Xie, L.P. Zhu, L.L. Wang et al., Photodegradation of benzene by TiO2 nanoparticles prepared by flame CVD process. Particuology 9 (2011)75-79.

DOI: 10.1016/j.partic.2010.05.010

[9] H.Y. Xie, L.L. Wang, L.P. Zhu et al., Photodegradation of ammonia by TiO2 nanoparticles produced by flame CVD process. Advanced Materials Research 152-153 (2011)391-394.

DOI: 10.4028/www.scientific.net/amr.152-153.391

[10] H.Y. Xie, S.W. Chen, C.W. Ma et al., Photodegradation of toluene by TiO2 nanoparticles by Flame CVD Process. Advanced Materials Research 233-235(2011)1474-1478.

[11] S. Sitkiewicz, A. Heller, Photocatalytic oxidation of benzene and stearic acid on sol-gel derived TiO2 thin films attached to glass. New J. Chem. 20 (1996)233-242.

[12] M.M. Ameen, G.B. Raupp, Reversible catalyst deactivation in the photocatalytic oxidation of diluteo-xylene in Air. J. Catal. 184(1999)112-122.

DOI: 10.1006/jcat.1999.2442

[13] A.J. Maira, K.L. Yeung, J. Soria et al., Gas-phase photo-oxidation of toluene using nanometer-size TiO2 catalysts. Appl. Catal. B: Environ. 29(2001)327-336.

DOI: 10.1016/s0926-3373(00)00211-3

[14] J. Peral, D.F. Ollis, Heterogeneous photocatalytic oxidation of gas-phase organics for air purification: Acetone, 1-butanol, butyraldehyde, formaldehyde, and m-xylene oxidation. J. Catal. 136(1992)554-565.

DOI: 10.1016/0021-9517(92)90085-v

[15] R.M. Alberci, M.C. Canela, M.N. Eberlin, W.F. Jardim, Catalyst deactivation in the gas phase destruction of nitrogen-containing organic compounds using TiO2/UV–VIS. Appl. Catal. B: Environ. 30(2001)389-397.

DOI: 10.1016/s0926-3373(00)00256-3

[16] D.V. Kozlov, A.V. Vorontsov, P.G. Smirniotis, E.B. Savinos, Gas-phase photocatalytic oxidation of diethyl sulfide over TiO2: kinetic investigations and catalyst deactivation. Appl. Catal. B: Environ. 42(2003)77-87.

DOI: 10.1016/s0926-3373(02)00217-5

[17] A.V. Vorontsov, C. Lion, E.N. Savinov, P.G. Smirniotis, Pathways of photocatalytic gas phase destruction of HD simulant 2-chloroethyl ethyl sulfide. J. Catal. 220(2003)414-423.

DOI: 10.1016/s0021-9517(03)00293-8

[18] M. Sauer, D.F. Ollis, Acetone oxidation in a photocatalytic monolith reactor. J. Catal. 149 (1994)81-91.

DOI: 10.1006/jcat.1994.1274

[19] H. Einaga, S. Futamura, T. Ibusuki, Photocatalytic decomposition of benzene over TiO2 in a humidified air stream. Phys. Chem. Chem. Phys. 1(1999)4903-4908.

DOI: 10.1039/a906214i

[20] H. Einaga, S. Futamura, T. Ibusuki, Heterogeneous photocatalytic oxidation of benzene, toluene, cyclohexene and cyclohexane in humidified air: comparison of decomposition behavior on photoirradiated TiO2 catalyst. Appl. Catal. B: Environ. 38(2002).

DOI: 10.1016/s0926-3373(02)00056-5

[21] H.Y. Xie, G.L. Gao, Z. Tian et al., Synthesis of TiO2 nanoparticles by propane/air turbulent flame CVD process. Particuology 7 (2009)204-210.

DOI: 10.1016/j.partic.2009.03.003

[22] K.V. Baiju, A. Zachariah, S. Shukla, Correlating photoluminescene and photocatalytic activity of mixed-phase nanocrystalline titania. Catal. Lett., 130 (2009)130-136.

DOI: 10.1007/s10562-008-9798-5

[23] V. Etacheri, M.K. Seery, S.J. Hinder, S.C. Pillai, Highly visible light active TiO2−xNx heterojunction photocatalysts, Chem. Mater. 22 (2010)3843-3853.

DOI: 10.1021/cm903260f