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KMID : 1024519970060010075
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Journal of the Environmental Sciences
1997 Volume.6 No. 1 p.75 ~ p.88
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Photodegradation of Halogen Derivatives of Aliphatic Hydrocarbon in Aqueous Photocatalytic Suspensions
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Jun Jin
Jung Hak-Jin
Kim Hae-Jin
Kim Sam-Hyeok
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Abstract
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The rates of photodegradation, reactivities, and mechanisms of photooxidation for the aqueous solution containing with halogen derivatives of aliphatic hydrocarbons have been discussed with respect to the kinds of photocatalysts, concentration of photocatalytlc suspensions, strength of radiant power, time of illumination, changes of pH of substrate solution, wavelength of radiation, and pressure of oxygen gas saturated In the solution. These aqueous solutions suspended with 0.5 powder have been photodecomposed in the range of 100 and 93.8% per 1 hour if it is illuminated with wavelength (λ 300nm) produced from Xe-lamp(450W). The photocatalytic abilities have been increased In the order of < CdS < < <, and rates of photodegradation for the solution have maldmum values in the condition of pH 6 ~ 8 and 3 psi- . These rates for the Photoolddation Per 1 hour were dependent on the size of molecular weight and chemical bonding for organic halogen compounds and the rates of photodegadation were increased in the order of < < < tracts- < cis- The and t99% for these solutions were 5~21 and 40~90 minutes. respectively, and these values were coincided with Initial reaction kinetics(ro). It was found that reaction of photodegradation has the pseudo first-order kinetics controlled by the amount of diffused from a surface of photocatalysts.
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KEYWORD
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Photocatalyst, photooxidation, photodegradation, halogen dervatives, ali-phatic hydrocarbons, preudo first-order reaction, photoreaction-mechanisms
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