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June 11, 2026Environmental Science & Technology

Single Particle Investigation Supports Interfacial Pathway for SO 2 –NO 2 Heterogeneous Reaction

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Authors

KZKaiqi ZhangJYJumabubi YishakeYZY ZHAO

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Overview

Randomized trial examines mechanisms of sulfate formation from SO2 and NO2 in aerosols, suggesting inhibitory effects of particle composition.

Key Points

  • This research aims to clarify the kinetics and mechanisms of the SO2-NO2 heterogeneous reaction and its role in sulfate formation.
  • Employed aerosol optical tweezers to investigate the reaction on microdroplets at the single-particle level.
  • Utilized competing mechanistic frameworks (aqueous and interfacial models) for data interpretation.
  • Modified particle composition with ionic surfactants and polyethylene glycol (PEG) to assess their effects on the reaction.
  • The interfacial reaction model provided a superior fit, yielding rate constants that decrease exponentially with particle pH.
  • Chloride ions accelerated sulfate production by over an order of magnitude compared to sulfate ions, not explained by the aqueous model.
  • For PEG, the reaction rate decreased almost linearly with its mass fraction, indicating composition's significant role.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a2a503380c8f91e7f39ccc1https://doi.org/10.1021/acs.est.5c18852
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