Preliminary results on the effect of power ultrasound on nitrogen oxide and dioxide atmosphere in nitric acid solutions. |
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| Authors: | P Moisy I Bisel F Genvo F Rey-Gaurez L Venault P Blanc |
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| Affiliation: | 1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Jiaxing Environmental Monitoring Station, Jiaxing 314000, China;1. Faculty of Chemistry, Department of Analytical Chemistry and Instrumental Analysis, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;2. Faculty of Chemistry, Department of Environmental Chemistry, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;3. Faculty of Chemistry, Department of Chemical Technology, Maria Curie-Skłodowska University, 20-031 Lublin, Poland;3. Institut de Recherche Interdisciplinaire en Biologie Humaine et Moléculaire (IRIBHM) Université Libre de Bruxelles (ULB), Campus Erasme, 808 Route de Lennik, B-1070 Brussels, Belgium;4. Institut des Maladies Métaboliques et Cardiovasculaires, INSERM, Université Toulouse III Paul Sabatier, 31432 Toulouse, France |
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| Abstract: | The effect of ultrasound (20 kHz, 3 W cm-2) on the kinetics of HNO2 and H2O2 formation was investigated in a 1 M HNO3 medium for NO2-Ar and NO-Ar gas mixtures in various volume fractions (f(NO2) < 1.7 vol% and f(NO) < 1.1 vol%, respectively). The H2O2 formation rate measured in 1 M HNO3 in the presence of N2H5NO3 was observed to be much lower than that of HNO2 without N2H5NO3, and was relatively independent of the NO2 or NO gas volume fractions in the argon atmosphere. The HNO2 formation rate increased under ultrasound, and was higher with NO than with NO2. The induction period observed without ultrasound disappeared when ultrasound was applied. The first step in the sonochemical mechanism of HNO2 formation in the presence of NO2 involves thermal decomposition of NO2 into NO within the cavitation bubble. In the second step of HNO2 formation, NO reacts either with HNO3 in the cavitation bubble, or with NO2 in the cavitation bubble or at the bubble/solution interface. |
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