Chemical effects induced by gas–liquid jet flow

Zhang, Zhiliang; Lu, Jiaqi; Lv, Bingqian; Liu, Wei; Shen, Shuyuan; Wang, Dongting; Ji, Jianbing

doi:10.1039/d1re00519g

Cited by 4 publications

(2 citation statements)

References 28 publications

(39 reference statements)

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“…It will hopefully lead to industrial applications of sonochemical reduction as well as oxidation because it is a green process [ 167 , 168 , 169 ]. The same is true for chemical reactions induced by hydrodynamic cavitation (sometimes called fine-bubble technology) [ 170 , 171 , 172 , 173 , 174 ].…”

Section: Results Of Numerical Simulations and Discussionmentioning

confidence: 99%

The Reducing Agents in Sonochemical Reactions without Any Additives

Yasui

2023

Molecules

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It has been experimentally reported that not only oxidation reactions but also reduction reactions occur in aqueous solutions under ultrasound without any additives. According to the numerical simulations of chemical reactions inside an air or argon bubble in water without any additives under ultrasound, reducing agents produced from the bubbles are H, H2, HO2 (which becomes superoxide anion (O2−) in liquid water), NO, and HNO2 (which becomes NO2− in liquid water). In addition, H2O2 sometimes works as a reducing agent. As the reduction potentials of H and H2 (in strongly alkaline solutions for H2) are higher than those of RCHOH radicals, which are usually used to reduce metal ions, H and H2 generated from cavitation bubbles are expected to reduce metal ions to produce metal nanoparticles (in strongly alkaline solutions for H2 to work). It is possible that the superoxide anion (O2−) also plays some role in the sonochemical reduction of some solutes. In strongly alkaline solutions, hydrated electrons (e−aq) formed from H atoms in liquid water may play an important role in the sonochemical reduction of solutes because the reduction potential is extremely high. The influence of ultrasonic frequency on the amount of H atoms produced from a cavitation bubble is also discussed.

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Section: Results Of Numerical Simulations and Discussionmentioning

confidence: 99%

The Reducing Agents in Sonochemical Reactions without Any Additives

Yasui

2023

Molecules

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“…22,23 The resulting energy is strong enough to destroy the chemical bonds of water molecules and the hydroxyl radical (cOH, oxidation potential 2.8 eV) and strong oxidation occurs, acting on the pollutants and achieving degradation. 24 Simultaneously, the extremely high temperature and pressure conditions generated during HC provide extreme chemical reaction conditions for pollutant degradation. HC can degrade organic pollutants solely by relying on the kinetic energy and pressure of water without additives or external energy.…”

Section: Introductionmentioning

confidence: 99%