Cited 50 time in webofscience Cited 55 time in scopus

Spontaneous generation of hydrogen peroxide from aqueous microdroplets

Title
Spontaneous generation of hydrogen peroxide from aqueous microdroplets
Authors
Lee, Jae KyooWalker, Katherine L.Han, Hyun SooKang, JooyounPrinz, Fritz B.Waymouth, Robert M.Nam, Hong GilZare, Richard N.
DGIST Authors
Nam, Hong Gil
Issue Date
2019
Citation
Proceedings of the National Academy of Sciences of the United States of America, 116(39), 19294-19298
Type
Article
Article Type
Article
Author Keywords
microdroplethydrogen peroxidewater oxidationwater-air interfacegreen chemistry
Keywords
MASS-SPECTROMETRYCHEMISTRYOXYGEN
ISSN
0027-8424
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/10778
DOI
10.1073/pnas.1911883116
Publisher
National Academy of Sciences
Related Researcher
  • Author Nam, Hong Gil CBRG(Complex Biology Research Group)
  • Research Interests Plant Aging and Life History; Systems Biology; Complexbiology; Comparative Aging Research
Files:
There are no files associated with this item.
Collection:
Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles


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