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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 8
BKCSDE 32(8)
August 20, 2011 

Effect of Nitrite and Nitrate as the Source of OH Radical in the O3/UV Process with or without Benzene
Hyun-Seok Son, A. J. Saleh Ahammad, Md. Mahbubur Rahman, Kwang-Mo Noh, Jae-Joon Lee,*,
Ozone, UV, OH radical, NO2, NO3
This study suggests the prediction model for the concentration variation of NO2 − and NO3 − along with the rate constants of all reactions during ozonation under UV radiation (O3/UV process). While NO2 − was completely converted into NO3 − during the O3-only process, the production of NO2 radical or N2O4 was expected in the O3/ UV process. In addition, the quenching of OH radicals, by NO2 radical in the O3/UV process, resulted in regeneration of NO2 −. However, the regeneration of NO2 − was not observed in the O3/UV process in the presence of C6H6 where the concentrations of NO2 − and NO3 − were significantly reduced compared to in the process without C6H6. The pseudo-first order rate constants of all species were calculated with and without the presence of C6H6 to predict the variation of concentrations of all species during the O3/UV process. It was suggested that NO2 − and NO3 − in the O3/UV process can be more effectively removed from an aqueous system with an OH radical scavenger such as C6H6.
3039 - 3044
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