Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Effect of Nitrite and Nitrate as the Source of OH Radical in the O3/UV Process with or without Benzene

  • Son, Hyun-Seok (Department of Applied Chemistry, Konkuk University) ;
  • Ahammad, A.J. Saleh (Department of Advanced Technology Fusion, Konkuk University) ;
  • Rahman, Md. Mahbubur (Department of Advanced Technology Fusion, Konkuk University) ;
  • Noh, Kwang-Mo (Department of Nano Science & Mechanical Engineering, Konkuk University) ;
  • Lee, Jae-Joon (Department of Applied Chemistry, Konkuk University)
  • Received : 2011.03.16
  • Accepted : 2011.06.06
  • Published : 2011.08.20
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Abstract

This study suggests the prediction model for the concentration variation of $NO_2{^-}$ and $NO_3{^-}$ along with the rate constants of all reactions during ozonation under UV radiation ($O_3$/UV process). While $NO_2{^-}$ was completely converted into $NO_3{^-}$ during the $O_3$-only process, the production of $NO_2$ radical or $N_2O_4$ was expected in the $O_3$/UV process. In addition, the quenching of OH radicals, by $NO_2$ radical in the $O_3$/UV process, resulted in regeneration of $NO_2{^-}$. However, the regeneration of $NO_2{^-}$ was not observed in the $O_3$/UV process in the presence of $C_6H_6$ where the concentrations of $NO_2{^-}$ and $NO_3{^-}$ were significantly reduced compared to in the process without $C_6H_6$. The pseudo-first order rate constants of all species were calculated with and without the presence of $C_6H_6$ to predict the variation of concentrations of all species during the $O_3$/UV process. It was suggested that $NO_2{^-}$ and $NO_3{^-}$ in the $O_3$/UV process can be more effectively removed from an aqueous system with an OH radical scavenger such as $C_6H_6$.

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