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Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions

Micro-nanobubbles (MNBs) technology has emerged as an effective means of sewage treatment, while the molecular mechanism for its pollutant degradation is still unknown. In this paper, the reactive molecular dynamics simulation technique is used to study the degradation mechanism of pollutants caused...

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Detalles Bibliográficos
Autores principales: Zhou, Youbin, Cao, Dapeng, Zhang, Xianren
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9370588/
https://www.ncbi.nlm.nih.gov/pubmed/35957083
http://dx.doi.org/10.3390/nano12152654
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author Zhou, Youbin
Cao, Dapeng
Zhang, Xianren
author_facet Zhou, Youbin
Cao, Dapeng
Zhang, Xianren
author_sort Zhou, Youbin
collection PubMed
description Micro-nanobubbles (MNBs) technology has emerged as an effective means of sewage treatment, while the molecular mechanism for its pollutant degradation is still unknown. In this paper, the reactive molecular dynamics simulation technique is used to study the degradation mechanism of pollutants caused by shock-induced nanobubble collapse. We first demonstrate that the propagating shock wave can induce nanobubble collapse, and the collapsing nanobubble has the ability to focus mechanical energy via the converging motion of liquid in the interior of the bubble, leading to the formation of a high-speed jet with a much higher energy density. We also unveil the mechanical nature of long-chain pollutant degradation and the mechanism of free radical generation. Due to the impacting jet, the high-gradient flow has the ability to stretch the long-chain molecule and cause mechanical scission of the molecule in a homolytic manner. Finally, our simulation results reveal that adding ozone molecules to the collapsing bubble would introduce an additional dehydrogenation mechanism.
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spelling pubmed-93705882022-08-12 Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions Zhou, Youbin Cao, Dapeng Zhang, Xianren Nanomaterials (Basel) Article Micro-nanobubbles (MNBs) technology has emerged as an effective means of sewage treatment, while the molecular mechanism for its pollutant degradation is still unknown. In this paper, the reactive molecular dynamics simulation technique is used to study the degradation mechanism of pollutants caused by shock-induced nanobubble collapse. We first demonstrate that the propagating shock wave can induce nanobubble collapse, and the collapsing nanobubble has the ability to focus mechanical energy via the converging motion of liquid in the interior of the bubble, leading to the formation of a high-speed jet with a much higher energy density. We also unveil the mechanical nature of long-chain pollutant degradation and the mechanism of free radical generation. Due to the impacting jet, the high-gradient flow has the ability to stretch the long-chain molecule and cause mechanical scission of the molecule in a homolytic manner. Finally, our simulation results reveal that adding ozone molecules to the collapsing bubble would introduce an additional dehydrogenation mechanism. MDPI 2022-08-02 /pmc/articles/PMC9370588/ /pubmed/35957083 http://dx.doi.org/10.3390/nano12152654 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhou, Youbin
Cao, Dapeng
Zhang, Xianren
Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title_full Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title_fullStr Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title_full_unstemmed Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title_short Degradation Mechanism of Micro-Nanobubble Technology for Organic Pollutants in Aqueous Solutions
title_sort degradation mechanism of micro-nanobubble technology for organic pollutants in aqueous solutions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9370588/
https://www.ncbi.nlm.nih.gov/pubmed/35957083
http://dx.doi.org/10.3390/nano12152654
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