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Spontaneous generation of hydrogen peroxide from aqueous microdroplets
- 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.
- DGIST Authors
- Nam, Hong Gil
- Issue Date
- Proceedings of the National Academy of Sciences of the United States of America, 116(39), 19294-19298
- Article Type
- Author Keywords
- microdroplet; hydrogen peroxide; water oxidation; water-air interface; green chemistry
- MASS-SPECTROMETRY; CHEMISTRY; OXYGEN
- We show H2O2 is spontaneously produced from pure water by atomizing bulk water into microdroplets (1 μm 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 catalystfree and voltage-free H2O2 production method provides innovative opportunities for green production of hydrogen peroxide. © 2019 National Academy of Sciences. All rights reserved.
- National Academy of Sciences
- Related Researcher
Nam, Hong Gil
CBRG(Complex Biology Research Group)
Plant Aging and Life History; Systems Biology; Complexbiology; Comparative Aging Research
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- Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles
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