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Photoaging of Terrestrial Plastic Pollution: A Process Affected by Precipitation
Jiehan Duan1, Danqing Zheng1, Yanlin Wu2
1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China.
Environmental Science & Technology
|February 26, 2025
Summary
Common rainwater accelerates plastic photoaging by promoting chemical changes. Repeated wet-dry cycles, simulating precipitation and evaporation, significantly increase plastic degradation compared to dry conditions.
Area of Science:
- Environmental Science
- Materials Science
- Photochemistry
Background:
- Terrestrial plastic pollutants primarily interact with rainwater, a key environmental factor.
- Rainwater components and interfaces can influence plastic degradation pathways.
- Photoaging involves complex reactions at solid-liquid and solid-gas interfaces, especially during wet-dry cycles.
Purpose of the Study:
- To investigate the impact of common rainwater (CR), rainwater residue (RR), and rainwater-free (RF) conditions on the photoaging of various microplastics under UV radiation.
- To analyze the chemical changes in microplastics and commercial plastics exposed to different rainwater conditions and UV radiation.
- To assess the role of alternating interface transitions in plastic photoaging.
Main Methods:
- Exposure of polyvinyl chloride, polypropylene, polystyrene, and polyethylene microplastics to UVA, UVB, or UVC radiation under CR, RR, and RF treatments.
- Seasonal field exposure of commercial plastics under natural conditions.
- Fourier-transform infrared (FT-IR) spectroscopy to analyze chemical modifications (e.g., carbonyl production).
- Development of a predictive model using precipitation and radiation data.
Main Results:
- Common rainwater (CR) exposure accelerated carbonyl production during microplastic photoaging compared to RF and RR treatments.
- A predictive model successfully estimated the carbonyl index of field-exposed plastics, emphasizing the significance of alternating interface transitions.
- Wet-dry cycles due to rainwater exposure increased the carbonyl index 1.013–5.460 times more than conditions without rainwater exposure.
Conclusions:
- Plastics exhibit distinct photochemical reactions on different interfaces influenced by rainwater.
- Alternating interface transitions, driven by precipitation and evaporation cycles, significantly accelerate plastic photoaging.
- Understanding these processes is crucial for assessing the environmental fate and impact of plastic pollution.
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