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Spontaneous generation of hydrogen peroxide from aqueous microdroplets
We show H(2)O(2) is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm to 20 µm in diameter). Production of H(2)O(2), as assayed by H(2)O(2)-sensitve fluorescence dye peroxyfluor-1, increased with decreasing microdroplet size. Cleavage of 4-carboxyphenylboronic a...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
National Academy of Sciences
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6765303/ https://www.ncbi.nlm.nih.gov/pubmed/31451646 http://dx.doi.org/10.1073/pnas.1911883116 |
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author | Lee, Jae Kyoo Walker, Katherine L. Han, Hyun Soo Kang, Jooyoun Prinz, Fritz B. Waymouth, Robert M. Nam, Hong Gil Zare, Richard N. |
author_facet | Lee, Jae Kyoo Walker, Katherine L. Han, Hyun Soo Kang, Jooyoun Prinz, Fritz B. Waymouth, Robert M. Nam, Hong Gil Zare, Richard N. |
author_sort | Lee, Jae Kyoo |
collection | PubMed |
description | We show H(2)O(2) is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm to 20 µm in diameter). Production of H(2)O(2), as assayed by H(2)O(2)-sensitve fluorescence dye peroxyfluor-1, increased with decreasing microdroplet size. Cleavage of 4-carboxyphenylboronic acid and conversion of phenylboronic acid to phenols in microdroplets further confirmed the generation of H(2)O(2). The generated H(2)O(2) concentration was ∼30 µM (∼1 part per million) as determined by titration with potassium titanium oxalate. Changing the spray gas to O(2) or bubbling O(2) decreased the yield of H(2)O(2) in microdroplets, indicating that pure water microdroplets directly generate H(2)O(2) without help from O(2) either in air surrounding the droplet or dissolved in water. We consider various possible mechanisms for H(2)O(2) formation and report a number of different experiments exploring this issue. We suggest that hydroxyl radical (OH) recombination is the most likely source, in which OH is generated by loss of an electron from OH(−) at or near the surface of the water microdroplet. This catalyst-free and voltage-free H(2)O(2) production method provides innovative opportunities for green production of hydrogen peroxide. |
format | Online Article Text |
id | pubmed-6765303 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | National Academy of Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-67653032019-10-29 Spontaneous generation of hydrogen peroxide from aqueous microdroplets Lee, Jae Kyoo Walker, Katherine L. Han, Hyun Soo Kang, Jooyoun Prinz, Fritz B. Waymouth, Robert M. Nam, Hong Gil Zare, Richard N. Proc Natl Acad Sci U S A Physical Sciences We show H(2)O(2) is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm to 20 µm in diameter). Production of H(2)O(2), as assayed by H(2)O(2)-sensitve fluorescence dye peroxyfluor-1, increased with decreasing microdroplet size. Cleavage of 4-carboxyphenylboronic acid and conversion of phenylboronic acid to phenols in microdroplets further confirmed the generation of H(2)O(2). The generated H(2)O(2) concentration was ∼30 µM (∼1 part per million) as determined by titration with potassium titanium oxalate. Changing the spray gas to O(2) or bubbling O(2) decreased the yield of H(2)O(2) in microdroplets, indicating that pure water microdroplets directly generate H(2)O(2) without help from O(2) either in air surrounding the droplet or dissolved in water. We consider various possible mechanisms for H(2)O(2) formation and report a number of different experiments exploring this issue. We suggest that hydroxyl radical (OH) recombination is the most likely source, in which OH is generated by loss of an electron from OH(−) at or near the surface of the water microdroplet. This catalyst-free and voltage-free H(2)O(2) production method provides innovative opportunities for green production of hydrogen peroxide. National Academy of Sciences 2019-09-24 2019-08-26 /pmc/articles/PMC6765303/ /pubmed/31451646 http://dx.doi.org/10.1073/pnas.1911883116 Text en Copyright © 2019 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) . |
spellingShingle | Physical Sciences Lee, Jae Kyoo Walker, Katherine L. Han, Hyun Soo Kang, Jooyoun Prinz, Fritz B. Waymouth, Robert M. Nam, Hong Gil Zare, Richard N. Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title | Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title_full | Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title_fullStr | Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title_full_unstemmed | Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title_short | Spontaneous generation of hydrogen peroxide from aqueous microdroplets |
title_sort | spontaneous generation of hydrogen peroxide from aqueous microdroplets |
topic | Physical Sciences |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6765303/ https://www.ncbi.nlm.nih.gov/pubmed/31451646 http://dx.doi.org/10.1073/pnas.1911883116 |
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