Degradation of trace aqueous 4chloro2nitropheno

Authors: P Gharbani M Khosravi S M Tabatabaii K Zare S Dastmalchi A Mehrizad

Publish Date: 2010/03/01

Volume: 7, Issue: 2, Pages: 377-384

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Abstract

Degradation of 4chloro2nitro phenol by ozonation in aqueous solution was studied in a semi batch reactor under constant ozone dosage and variable pH conditions The effectiveness of the process was estimated based on the degree of conversion of 4chloro2nitro phenol It was observed that ozonation is more effective at alkaline reaction of medium than other conditions The degree of conversion achieved at the first 5 minutes of the processat pH 9 was 9964 compared to 9903 and 7735 at pH 7 and 3 respectively Another parameter used to quantify the 4chloro2nitrophenol during ozonation was the pseudo first order rate constant k min−1 Results showed that the rate constant of the process was approximately much higher at the alkaline pH compared to acidic ones A considerable improvement in chemical oxygen demand removal was observed at pH above 7 At pH 9 the reduction in chemical oxygen demand at the end of the process reached 569 The degree of organically bounded nitrogen conversion to nitrate was higher at pH 3 Of the total organic carbon reduction 1589 was observed at pH 9 The 4chloro2nitro phenol degradation intermediate products were analyzed by mass spectrometry The main intermediate product was chlorophenol

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