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Hydrogen peroxide (H2O2) forms in sprayed water through electron transfer between charged microdroplets. This process is facilitated by surface effects and restricted hydration, driven by spraying energy.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Aerosol Science

Background:

  • The formation mechanism of hydrogen peroxide (H2O2) in sprayed water remains poorly understood.
  • Existing theories suggest a role for hydroxyl radicals (HO•) generated on microdroplet surfaces.

Purpose of the Study:

  • To elucidate the mechanism of H2O2 formation in sprayed water.
  • To investigate the role of charged microdroplets and surface phenomena in H2O2 generation.

Main Methods:

  • Analysis of ion behavior on microdroplet surfaces.
  • Thermodynamic calculations of electron transfer reactions.
  • Consideration of hydration energies in bulk versus surface water.

Main Results:

  • Spraying water generates charged microdroplets with excess H+ or OH- ions concentrated at the surface.
  • Electron transfer between surface ions (HOS- + HS+ = HOS• + HS•) occurs upon microdroplet encounters.
  • The endothermicity of electron transfer is reversed in surface water due to reduced ion hydration, favoring H2O2 formation.

Conclusions:

  • H2O2 formation in sprayed water is driven by the energy of spraying.
  • The process is governed by electron transfer reactions on the surfaces of charged microdroplets with restricted hydration.
  • Surface effects significantly alter reaction energetics compared to bulk water.