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Spontaneous Interfacial Redox Transformation of 6PPD-Quinone on Water Microdroplets
Jian Yan1,2, Ruiqing Zhang3, Yuan Gao1
1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Tire-derived contaminant 6PPD-Q rapidly transforms at air-water interfaces, forming more toxic hydroquinone derivatives. This atmospheric chemistry finding highlights new environmental and human health risks.
Area of Science:
- Environmental Chemistry
- Atmospheric Chemistry
- Chemical Kinetics
Background:
- 6PPD-Q is an emerging tire-derived contaminant with known toxicity.
- Atmospheric transformations of contaminants are critical for environmental fate.
- Air-water interfaces are key sites for chemical reactions in the atmosphere.
Purpose of the Study:
- To investigate the atmospheric transformation of 6PPD-Q at air-water interfaces.
- To determine the reaction kinetics and mechanisms of 6PPD-Q degradation.
- To assess the toxicity of 6PPD-Q transformation products.
Main Methods:
- Microdroplet experiments under ambient conditions.
- Molecular simulations to elucidate reaction mechanisms.
- Kinetic analysis of degradation rates.
Main Results:
- 6PPD-Q undergoes ultrafast transformation at air-water interfaces (<2 min half-life).
- Reaction is significantly accelerated (1176-fold) compared to bulk water.
- Reductive-oxidative species synergy effect (ROSE) driven by microdroplet electrification.
- Generation of hydroquinone derivatives with predicted higher toxicity (1.1-2.6 fold) than 6PPD-Q.
Conclusions:
- A novel atmospheric pathway for 6PPD-Q transformation is identified.
- ROSE mechanism drives rapid interfacial redox reactions.
- Generated hydroquinone derivatives pose elevated human health risks.
- Study enhances understanding of 6PPD-Q atmospheric chemistry and toxicity.
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