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Ozonation combined with sonolysis for degradation and detoxification of m-nitrotoluene in aqueous solution / Zhiqiao He in Industrial & engineering chemistry research, Vol. 48 N° 12 (Juin 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5578–5583 Titre : Ozonation combined with sonolysis for degradation and detoxification of m-nitrotoluene in aqueous solution Type de document : texte imprimé Auteurs : Zhiqiao He, Auteur ; Runye Zhu, Auteur ; Xing Xu, Auteur Année de publication : 2009 Article en page(s) : pp. 5578–5583 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Sonolytic  ozonation  Nitroaromatic  compound  m-nitrotoluene  Toxicity  Aqueous  solution Résumé : Sonolytic ozonation (US/O3 oxidation) is an advanced oxidation process that has become a focus of intense investigation. In this study, the nitroaromatic compound m-nitrotoluene (MNT) was chosen as a model substrate for degradation experiments in which pH, initial concentration of MNT, ozone dose, and US density were varied. At pH 10.0, initial concentration of MNT 400 mg/L, ozone dose 2.4 g/h, and US energy density 88 W/L, the efficiency of MNT removal reached 98% after 120 min. Of the initial degradation rate of MNT abatement, 9.8, 4.1, and 1.1 mg/(L min) were observed with US/O3, O3, and US, respectively. The variation of the concentrations of related anions (oxalate, acetate, formate, and nitrate ion) during the reaction process was ascertained by ion chromatography (IC). The major intermediates detected by gas chromatography/mass spectrometry (GC/MS) were 3-nitrobenzaldehyde, 3-nitrobenzoic acid, nitrobenzene, benzene, butene diacid, oxalic acid, and acetic acid. A degradation pathway is proposed on the basis of these findings. The acute toxicity of the reaction solution to zebra fish (Danio rerio) was estimated after US/O3 treatment. According to the decreasing lethal rate during the US/O3 process, it could be deduced that US/O3 is a powerful tool with which to achieve effective reduction of the toxicity of MNT. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801566z [article] Ozonation combined with sonolysis for degradation and detoxification of m-nitrotoluene in aqueous solution [texte imprimé] / Zhiqiao He, Auteur ; Runye Zhu, Auteur ; Xing Xu, Auteur . - 2009 . - pp. 5578–5583. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 12 (Juin 2009) . - pp. 5578–5583 Mots-clés : Sonolytic  ozonation  Nitroaromatic  compound  m-nitrotoluene  Toxicity  Aqueous  solution Résumé : Sonolytic ozonation (US/O3 oxidation) is an advanced oxidation process that has become a focus of intense investigation. In this study, the nitroaromatic compound m-nitrotoluene (MNT) was chosen as a model substrate for degradation experiments in which pH, initial concentration of MNT, ozone dose, and US density were varied. At pH 10.0, initial concentration of MNT 400 mg/L, ozone dose 2.4 g/h, and US energy density 88 W/L, the efficiency of MNT removal reached 98% after 120 min. Of the initial degradation rate of MNT abatement, 9.8, 4.1, and 1.1 mg/(L min) were observed with US/O3, O3, and US, respectively. The variation of the concentrations of related anions (oxalate, acetate, formate, and nitrate ion) during the reaction process was ascertained by ion chromatography (IC). The major intermediates detected by gas chromatography/mass spectrometry (GC/MS) were 3-nitrobenzaldehyde, 3-nitrobenzoic acid, nitrobenzene, benzene, butene diacid, oxalic acid, and acetic acid. A degradation pathway is proposed on the basis of these findings. The acute toxicity of the reaction solution to zebra fish (Danio rerio) was estimated after US/O3 treatment. According to the decreasing lethal rate during the US/O3 process, it could be deduced that US/O3 is a powerful tool with which to achieve effective reduction of the toxicity of MNT. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801566z