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• W2769937021 abstract "This paper reports on a study of the oxidation of p-nitrophenol (PNP) in a bubble column reactor (BCR). The use of the air stream aimed to provide perfect mixing in the liquid phase, which was successfully achieved and checked experimentally; there were no concentration gradients along the column, even at the lowest air flow rate used (Q = 1 mL/min at room temperature and atmospheric pressure). The effect of the operating variables was assessed, and a total reduction of PNP was reached, as well as mineralization of 49.2%, oxidant consumption of 90.3%, and with an efficiency of use - ηH2O2 - of 0.09 mg C/mg H2O2, under the best operating conditions found - Q = 1 mL/min, [H2O2] = 1.6 g/L, [Fe2+] = 80 mg/L, pH = 3.0 and T = 22–24 °C - (after 120 min of reaction). Following this, various strategies were developed for improving the mineralization rate; it was found that the addition of H2O2 every 5 min and readjusting the pH after 30 min of reaction allow the attainment of a much higher TOC removal (75.1%) and efficiency of oxidant use (ηH2O2 = 0.17 mg C/mg H2O2) with less oxidant. A reaction mechanism was proposed, based on intermediates identified that include p-nitrocatechol - PNC, p-benzoquinone - PB, hydroquinone - HQ - and carboxylic acids (oxalic, maleic and fumaric). Since the performance achieved in the BCR was good, and very similar to that obtained in a conventional batch reactor, it was possible to verify the efficacy of carrying out the Fenton process in this reactor configuration, which in our future work will focus on the treatability of industrial effluents." @default.
• W2769937021 created "2017-12-04" @default.
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• W2769937021 date "2018-01-01" @default.
• W2769937021 modified "2023-10-06" @default.
• W2769937021 title "p-Nitrophenol degradation by Fenton's oxidation in a bubble column reactor" @default.
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• W2769937021 doi "https://doi.org/10.1016/j.jenvman.2017.11.032" @default.
• W2769937021 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29169116" @default.
• W2769937021 hasPublicationYear "2018" @default.
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