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H2O2-Driven Sulfate Formation at Air-Water Interfaces: Stepwise Mechanism and Accelerated Kinetics
Yuchen Zhang1, Xiaohua Yang1, Jinkai Gu1
1State Key Laboratory of Environment Characteristics and Effects for Near-space, Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing100081, China.
Hydrogen peroxide (H2O2) drives sulfate production in fine particulate matter (PM2.5). This study reveals the air-water interface accelerates this process via a specific reaction pathway, crucial for atmospheric models.
Area of Science:
- Atmospheric Chemistry
- Environmental Science
- Physical Chemistry
Background:
- Sulfate is a major component of fine particulate matter (PM2.5), significantly impacting climate and air quality.
- Hydrogen peroxide (H2O2) is the primary oxidant for global sulfate production, but its interfacial acceleration mechanism is unclear.
Purpose of the Study:
- To elucidate the molecular-level mechanism of sulfate production at the air-water interface.
- To understand the factors contributing to the enhanced reaction rate at the interface compared to the bulk phase.
Main Methods:
- Employed a series of theoretical calculations to investigate the reaction pathway and energy barriers.
- Analyzed the influence of interfacial electric fields and solvation environments on the reaction kinetics.
Main Results:
- Identified a preferred prereaction complex at the air-water interface.
- Revealed a stepwise reaction pathway involving a HOOSO2- intermediate with a low rate-determining barrier (4.1 kcal/mol).
- Demonstrated that interfacial electric fields and partial solvation reduce the reaction barrier by 89% compared to the bulk phase.
Conclusions:
- The air-water interface is a critical site for H2O2-driven sulfate formation.
- Findings provide essential mechanistic insights for improving atmospheric aerosol models, especially with increasing H2O2 from wildfires.
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