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Bulk Phase Dominates Sulfur Dioxide Hydrolysis over Interfacial Processes.

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Summary
This summary is machine-generated.

Sulfur dioxide hydrolysis, key to sulfate formation, primarily occurs in bulk water, not the air-water interface. This finding impacts air quality and climate change models.

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Area of Science:

  • Atmospheric Chemistry
  • Environmental Science
  • Computational Chemistry

Background:

  • Sulfur dioxide (SO2) hydrolysis is crucial for secondary sulfate formation, impacting air quality and climate.
  • A long-standing debate exists regarding whether SO2 hydrolysis occurs at the air-water interface or in the bulk phase.
  • Previous studies suggested rapid interfacial reactions to explain high SO2 uptake coefficients.

Purpose of the Study:

  • To investigate the dominant phase of SO2 hydrolysis in heterogeneous systems.
  • To reconcile simulated results with observed SO2 uptake coefficients.
  • To elucidate the molecular mechanisms driving SO2 hydrolysis.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Employed a deep neural network potential with ab initio accuracy.
  • Investigated SO2 hydrolysis in heterogeneous aqueous systems.

Main Results:

  • Simulations reproduced observed SO2 uptake coefficients.
  • Interfacial hydrolysis was found to contribute only 1% to the overall reaction.
  • Bulk phase hydrolysis is accelerated due to an enhanced hydrogen-bond network, increasing SO2 electrophilicity and lowering the reaction barrier.

Conclusions:

  • The bulk phase is the primary site for SO2 hydrolysis, contrary to previous hypotheses.
  • Understanding SO2 hydrolysis mechanisms is essential for accurate modeling of sulfate aerosol formation.
  • This research improves the understanding of microdroplet chemistry and atmospheric sulfate production.