Theoretical investigation of the effect of ambient pressure on bubble sonochemistry: Special focus on hydrogen and reactive radicals production

Dehane, Aissa; Merouani, Slimane; Hamdaoui, Oualid

doi:10.1016/j.chemphys.2021.111171

Cited by 30 publications

(30 citation statements)

References 69 publications

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“…According to numerical simulations by other groups [ 73 , 86 , 89 , 90 , 91 , 102 , 103 , 104 , 105 , 106 , 107 , 108 ], the production of an appreciable amount of O radicals inside a cavitation bubble has also been reported.…”

Section: Conditions For O Radical Productionmentioning

confidence: 98%

Production of O Radicals from Cavitation Bubbles under Ultrasound

Yasui

2022

Molecules

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In the present review, the production of O radicals (oxygen atoms) in acoustic cavitation is focused. According to numerical simulations of chemical reactions inside a bubble using an ODE model which has been validated through studies of single-bubble sonochemistry, not only OH radicals but also appreciable amounts of O radicals are generated inside a heated bubble at the violent collapse by thermal dissociation of water vapor and oxygen molecules. The main oxidant created inside an air bubble is O radicals when the bubble temperature is above about 6500 K for a gaseous bubble. However, the concentration and lifetime of O radicals in the liquid water around the cavitation bubbles are unknown at present. Whether O radicals play some role in sonochemical reactions in the liquid phase, which are usually thought to be dominated by OH radicals and H2O2, should be studied in the future.

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Section: Conditions For O Radical Productionmentioning

confidence: 98%

Production of O Radicals from Cavitation Bubbles under Ultrasound

Yasui

2022

Molecules

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“…where n , O 2 n H O 2 and n t are the molar amount of oxygen, water vapor and gas mixture, respectively The thermal diffusivity at the bubble wall is calculated by [35]:…”

Section: The Physical and Mathematical Modelmentioning

confidence: 99%

“…constant, the molar concentration of species j (O 2 and H 2 O) and Avogadro number, respectively. The Hertz-Knudsen formula is used to predict the mass flux of evaporation and condensation at the gasliquid interface [35]:…”

Section: The Physical and Mathematical Modelmentioning

confidence: 99%

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Numerical investigation of sonochemical production in a single bubble under dual-frequency acoustic excitation

Lv,

Liu

2023

Phys. Scr.

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A numerical computation study about sonochemical activity of an oxygen bubble oscillations in a dual-frequency acoustic field is presented in this paper. The variation of excitation frequency causes the change of magnitude and duration of pressure acting on the bubble, affecting the instantaneous bubble radius, internal bubble temperature as well as chemical reactions. The numerical results indicate the formation of O2, HO2•, •OH, H•, O, H2 and H2O2 in an O2 bubble during collapse phase. The main oxidant is •OH radical. The influence of several parameters (e.g. couples of frequencies, the total pressure amplitude and the ratio of pressure amplitudes of the two waves) on the molar yields of the oxidants is analyzed. There is an optimum bubble collapse temperature (around 5648 K) for the •OH production. Moreover, the corresponding frequency intervals of enhanced effect and weakened effect under different coupled frequencies (i.e. 40, 140, 213, 355 and 515 kHz) are also investigated.

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“…Owing to the high oxidation potential and nonselective nature, hydroxyl radicals can attack and degrade most organic pollutants, including those recalcitrant ones, such as hydrocarbons [6] , pesticides [7] , and pharmaceutical compounds [8] . Therefore, it is traditionally perceived that the production of hydroxyl radicals should be maximized in sonochemistry applications [9] , [10] , [11] .…”

Section: Introductionmentioning

confidence: 99%