通过太阳光驱动的光化学去除地表水中的聚烯微塑料遵循线性动力学,不会导致碎片化
Erin Tuttle1, Charlotte Wiman2, Samuel Muñoz2,3
1Department of Biological and Physical Sciences, Assumption University, Worcester, Massachusetts 01609, United States.
Environmental science & technology
|March 15, 2024
概括
阳光将浮动的微塑料分解成溶解有机碳 (DOC). 线性动力学准确地估计了塑料的寿命,这表明表面水中的光化学寿命比以前想象的要长.
科学领域:
- 环境科学 环境科学
- 摄影化学的使用.
- 聚合物科学 聚合物科学
背景情况:
- 浮动微塑料经历光降解,将塑料碳转化为溶解有机碳 (DOC).
- 暴露于阳光和机械力量可能导致微塑料的碎片化.
- 了解浮动微塑料的光化学命运对于环境风险评估至关重要.
研究的目的:
- 为了研究聚烯微塑料的光化学降解.
- 为了确定塑料质量损失,碳损失和溶解有机碳 (DOC) 积累的动力学.
- 评估光降解在微塑料碎片化和尺寸缩小中的作用.
主要方法:
- 在模拟的阳光下,≤0.6毫米的聚烯微塑料的光降解.
- 随着时间的推移跟踪塑料质量,碳含量和颗粒大小分布.
- 溶解有机碳 (DOC) 形成的分析.
- 扫描电子显微镜 (SEM) 用于表面形态分析.
主要成果:
- 塑料质量和碳损失遵循线性动力学.
- 溶解有机碳 (DOC) 积累表现出西格形动力学,而不是指数.
- 氧化碳的积累占塑料总碳损失的不到50%.
- 扫描电子显微镜显示了裂,但碎片化最小;颗粒主要溶解.
结论:
- 线性动力学为表面水中的微塑料光化学寿命提供了更准确的估计.
- 以往基于指数级DOC积累的估计可能不准确.
- 在平静水中的光降解主要导致亚毫米塑料的溶解而不是碎片化.
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