Publisher : Korean Society of Environmental Engineering
DOI : 10.4491/eer.2014.022
Title & Authors
Photocatalytic Degradation of Gaseous Formaldehyde and Benzene using TiO2 Particulate Films Prepared by the Flame Aerosol Reactor Chang, Hyuksang; Seo, Moonhyeok;
Nano-sized particles were produced by a premixed flame aerosol reactor, and they were immobilized on a mesh-type substrate in form of particulate film. The reactor made it possible maintaining the original particulate characteristics determined in the flame synthetic process. The particulate morphology and crystalline phase were not changed until the particulate were finally coated on the substrate, which resulted in the better performance of the photocatalytic conversion of the volatile organic compounds (VOCs) in the ultraviolet system. In the flame aerosol reactor, the various specific surface areas and the anatase weight fractions of the synthesized particles were obtained by manipulating the parameters in the combustion process. The performance of the particulate films was evaluated for the destruction of the VOCs under the various UV irradiation conditions. The decomposition rates of benzene and formaldehyde under the irradiation of UV-C of 254 nm in wavelength were evaluated to check the performance of film layer to be applied in air quality control system.
Flame aerosol process;Particulate films;;
Fujishima A, Hashimoto K, Watanabe T. $TiO_2$ photocatalysis: fundamentals and applications. Tokyo: Bkc Inc.; 1999.
Dibble LA, Raupp GB. Kinetics of the gas-solid heterogeneous photocatalytic oxidation of trichloroethylene by near UV illuminated titanium dioxide. Catal. Lett. 1990;4:345-354.
Alberci RM, Jardim WM. Photocatalytic destruction of VOCs in the gas-phase using titanium dioxide. Appl. Catal. B Environ. 1997;14;55-68.
Fotou GP, Vemury S, Pratsinis SE. Synthesis and evaluation of titania powders for photodestruction of phenol. Chem. Eng. Sci. 1994;49:4939-4948.
Han J, Chang H, Lee J, Chang H. The aggregation of thermally stable particles in a premixed flat flame aerosol reactor. Aerosol Sci. Technol. 2003;37:550-564.
Lee J, Chang H. Preparation of $TiO_2$ by flame aerosol synthesis and its application to VOCs destruction 1: photocatalytic properties if the flame synthesis $TiO_2$. J. Korean Soc. Environ. Eng. 2002;24:889-900.
Ku BK, Kim SS, Kim YD, Lee SY. Direct measurement of electrospray droplets in submicron diameter using a freezing method and a TEM image processing technique. J. Aerosol Sci. 2001;32: 1459-1477.
Anpo M, Shima T, Kodama S, Kubokawa Y. Photocatalytic hydrogenation of propyne with water on small-particle titania: size quantization effects and reaction intermediates. J. Phys. Chem. 1987;91:4305-4310.
Wang W, Chiang LW, Ku Y. Decomposition of benzene in air streams by UV/$TiO_2$ process. J. Hazard. Mater. 2003;101: 133-146.
Lichtin NN, Sadeghi M. Oxidative photocatalytic degradation of benzene vapor over $TiO_2$. J. Photochem. Photobiol. A Chem. 1998;113:81-88.
Jeong MG, Park EJ, Seo HO, Kim KD, YD Kim, Lim DC. Humidity effect on photocatalytic activity of $TiO_2$ and regeneration of deactivated photocatalysts. Appl. Surf. Sci. 2013;271:164-170.
Sun S, Ding J, Bao J, Gao C, Qi Z, Li C. Photocatalytic oxidation of gaseous formaldehyde on $TiO_2$: an in situ DRIFTS study. Catal. Lett. 2010;137:239-246.
Noguchi T, Fujishima A, Sawunyama P, Hashimoto K. Photocatalytic degradation of gasesous formaldehyde using $TiO_2$ film. Environ. Sci. Technol. 1988;32:3831-3833.