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Spontaneous generation of hydrogen peroxide from aqueous microdroplets.


ABSTRACT: We show H2O2 is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 ?m to 20 µm in diameter). Production of H2O2, as assayed by H2O2-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 H2O2 The generated H2O2 concentration was ?30 µM (?1 part per million) as determined by titration with potassium titanium oxalate. Changing the spray gas to O2 or bubbling O2 decreased the yield of H2O2 in microdroplets, indicating that pure water microdroplets directly generate H2O2 without help from O2 either in air surrounding the droplet or dissolved in water. We consider various possible mechanisms for H2O2 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 H2O2 production method provides innovative opportunities for green production of hydrogen peroxide.

SUBMITTER: Lee JK 

PROVIDER: S-EPMC6765303 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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Spontaneous generation of hydrogen peroxide from aqueous microdroplets.

Lee Jae Kyoo JK   Walker Katherine L KL   Han Hyun Soo HS   Kang Jooyoun J   Prinz Fritz B FB   Waymouth Robert M RM   Nam Hong Gil HG   Zare Richard N RN  

Proceedings of the National Academy of Sciences of the United States of America 20190826 39


We show H<sub>2</sub>O<sub>2</sub> is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm to 20 µm in diameter). Production of H<sub>2</sub>O<sub>2</sub>, as assayed by H<sub>2</sub>O<sub>2</sub>-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<sub>2</sub>O<sub>2</sub> The generated  ...[more]

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