Degradation of p-nitrophenol by Gamma Irradiation

  • Lee, O Mi (Radiation Research Division for Industry & Environment, Korea Atomic Energy Reserch Institute) ;
  • Kim, Tae-Hun (Radiation Research Division for Industry & Environment, Korea Atomic Energy Reserch Institute) ;
  • Yu, Seungho (Radiation Research Division for Industry & Environment, Korea Atomic Energy Reserch Institute) ;
  • Jung, In-ha (Radiation Research Division for Industry & Environment, Korea Atomic Energy Reserch Institute) ;
  • Lee, Myunjoo (Radiation Research Division for Industry & Environment, Korea Atomic Energy Reserch Institute)
  • Received : 2011.11.14
  • Accepted : 2011.12.09
  • Published : 2011.12.30

Abstract

Degradation of p-nitrophenol has been carried out using only gamma irradiation or gamma irradiation with $H_2O_2$ or $Na_2S_2O_8$. Effects of different operating parameters such as initial concentration ($50mg\;l^{-1}$, $100mg\;l^{-1}$, $200mg\;l^{-1}$, $300mg\;l^{-1}$, $400mg\;l^{-1}$, $500mg\;l^{-1}$ and $600mg\;l^{-1}$) on the extent of degradation has been investigated. At 5 kGy, $50mg\;l^{-1}$ p-nitrophenol was completely degraded, and the radiolytic degradation of p-nitrophenol was described by the pseudo-first-order kinetic model. The combination of gamma irradiation with $H_2O_2$ or $Na_2S_2O_8$ leads to an enhanced effect, which remarkably increased the degradation efficiency of p-nitrophenol and TOC removal. However, at high $H_2O_2$ concentration, the efficacy of p-nitrophenol degradation is reduced because ${\cdot}OH$ radicals are scavenged by $H_2O_2$ and $Na_2S_2O_8$.

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Acknowledgement

Supported by : Ministry of Education, Science and Technology of Korea