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陆地塑料污染的光衰:受降水影响的过程

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

概括

常见的雨水通过促进化学变化来加速塑料的光衰老. 重复的湿干循环,模拟降水和蒸发,与干燥条件相比,显著增加了塑料的降解.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
摄影化学的使用.

背景情况:

陆地塑料污染物主要与雨水相互作用,这是一个关键的环境因素.
雨水成分和接口可以影响塑料降解途径.
光衰老涉及固体-液体和固体-气体接口的复杂反应,特别是在湿干循环期间.

研究的目的:

研究常见雨水 (CR),雨水残留物 (RR) 和无雨水 (RF) 条件对各种微塑料在紫外线辐射下的光衰老的影响.
分析微塑料和商业塑料中化学变化,这些塑料暴露在不同的雨水条件和紫外线辐射中.
评估交替接口过渡在塑料光衰老中的作用.

主要方法:

聚乙烯,聚烯,聚烯和聚乙烯微塑料在CR,RR和RF处理下暴露于UVA,UVB或UVC辐射.
在自然条件下,商业塑料的季节性现场暴露.
里埃变换红外光谱 (FT-IR) 用于分析化学变化 (例如,碳烯生产).
使用降水和辐射数据开发一个预测模型.

主要成果:

与RF和RR处理相比,常见的雨水 (CR) 暴露在微塑料光衰老过程中加速了碳基的产生.
一个预测模型成功估计了暴露在现场的塑料的碳基指数,强调了交替接口过渡的重要性.
由于雨水暴露而导致的湿干循环增加了碳烯指数1.0135.460倍,比没有雨水暴露的条件.

结论:

塑料在受雨水影响的不同界面上表现出不同的光化学反应.
由沉和蒸发周期驱动的交替接口过渡,显著加速塑料的光衰老.
了解这些过程对于评估塑料污染对环境的命运和影响至关重要.

关键词:

碳基指数是指碳基的含量.微塑料微塑料的使用摄影老化的照片.塑料污染塑料污染雨水雨水雨水雨水

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