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KMID : 1024519990080020241
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Journal of the Environmental Sciences
1999 Volume.8 No. 2 p.241 ~ p.248
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Photocatalytic-Photochemical Reaction of Wastewater Dyes in aqueous Solution
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Kim Sam-Hyeok
Choi Chil-Nam
Jung Oh-Jin
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Abstract
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The photocatalytic decolorization and photodegradation of wastewater contamininated with dyes such as methyleneblue tetrahydrate(MBT), methyl orange(MO), phenol red(PR) and the mixed dyes have been studied using a batch reactor in the presence of aerotropic and titania. Degussa P25 titanium oxide was used as the photocatalyst and proved to be effective for the dyes-degradation when irradiated with UV-light source emitting the wavelength of 253.7 nm in the presence of air. In addition to removing the color from the wastewater, the photocatalytic reaction simultaneously reduced the COD and optical density which suggests that the dissolved organic compounds have been photooxidized. The reaction rate of disappearance of the dyes were measured as a function of the irradiation times. The photooxidative procedure of the aquatic solution have the first order reaction-kinetics. The rate constants were increased in the order of PR < MBT < powder were irradiated with the UV -light source.
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KEYWORD
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Dyes, photooxidation, First order reaction kinetics, Rate constants, Photocatalyst
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