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Formation of hydrogen peroxide by VUV-photolysis of water and aqueous solutions with methanol

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Abstract

The hydrogen peroxide production upon vacuum ultraviolet (VUV) irradiation of water is reviewed, because published results from the last 10 years lead to conflicting mechanistic interpretations. This work confirms that in pure water, hydrogen peroxide is only produced in the presence of molecular oxygen. Mechanistic schemes explain these findings and confirm earlier statements that recombination of hydroxyl radicals is kinetically disfavoured. In agreement with other recent publications, this work confirms that enhanced hydrogen peroxide production takes place upon VUV irradiation of aqueous solutions of organic compounds. For these investigations, methanol was chosen as an organic model compound. During photolyses, hydrogen peroxide, dissolved molecular oxygen, pH-value of the reaction system, methanol and its products of oxidative degradation were analyzed, and kinetic studies were undertaken to explain the evolution of the concentrations of these components.

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Author notes

  1. Simone Robl

    Present address: Karlsruher Institut für Technologie (KIT), Campus Süd, Insitut für Technische Thermodynamik und Kältetechnik, 76131, Karlsruhe, Germany

  2. Michael Wörner

    Present address: Karlsruher Institut für Technologie (KIT), Campus Süd, Institut für Bio- und Lebensmitteltechnik, Bereich IV: Molekulare Aufarbeitung von Bioprodukten, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany

  3. André M. Braun

    Present address: Karlsruher Institut für Technologie (KIT), Campus Süd, Engler-Bunte-Institut, Engler-Bunte-Ring 1, 76131, Karlsruhe, Germany

Authors and Affiliations

  1. Lehrstuhl für Umweltmesstechnik, Engler-Bunte-Institut, Universität Karlsruhe, D-76131, Karlsruhe, Germany

    Simone Robl, Michael Wörner & André M. Braun

  2. Heinrich Sontheimer Laboratory of Water Technology, D-76139, Karlsruhe, Germany

    Dietrich Maier

Authors
  1. Simone Robl
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  2. Michael Wörner
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  3. Dietrich Maier
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  4. André M. Braun
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Corresponding author

Correspondence to André M. Braun.

Additional information

This article is published as part of a themed issue in honour of Professor Kurt Schaffner on the occasion of his 80th birthday.

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Robl, S., Wörner, M., Maier, D. et al. Formation of hydrogen peroxide by VUV-photolysis of water and aqueous solutions with methanol. Photochem Photobiol Sci 11, 1041–1050 (2012). https://doi.org/10.1039/c2pp05381k

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  • DOI: https://doi.org/10.1039/c2pp05381k

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