Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Photodegradation of Halogen Derivatives of Aliphatic Hydrocarbon in Aqueous Photocatalytic Suspensions

지방족 탄화수소의 할로겐 유도체 수용액의 광촉매-광분해

  • Jun, Jin (Dept. of Environmental Engineering, Dongshin University) ;
  • Jung, Hak-Jin (Dept. of Environmental Engineering, Dongshin University) ;
  • Kim, Hae-Jin (Dept. of Environmental Engineering, Dongshin University) ;
  • Kim, Sam-Hyeok (Dept. of Environmental Science, Chosun University)
  • 전진 (동신대학교 환경공학과) ;
  • 정학진 (동신대학교 환경공학과) ;
  • 김해진 (동신대학교 환경공학과) ;
  • 김삼혁 (조선대학교 환경학과)
  • Published : 1997.02.01
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Abstract

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 $gL^{-1}$ $TiO_2$ powder have been photodecomposed in the range of 100 and 93.8% per 1 hour if it is illuminated with wavelength (λ $\geq$ 300nm) produced from Xe-lamp(450W). The photocatalytic abilities have been increased In the order of $Fe_2O_3$ < CdS < $CeO_2$ < Y_2O_3$ <$TiO_2$, and rates of photodegradation for the solution have maldmum values in the condition of pH 6 ~ 8 and 3 psi-$O_2$ gL^{-1}$. 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 $C_2H_5Br$ < CH_2Br_2$ < C_5H_11Cl C_2H_4Cl_2$ < tracts-$C_2H_2Cl_2$ < cis-C_2H_2Cl_2$ The T_{1/2}$ 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 $h^+_{VB}$ diffused from a surface of photocatalysts.

Keywords

References

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