微塑料的衰老行为被机械碎片加速:内在和外在性质的改变
Yuwei Yan1,2, Yulu Yu2, Jingke Sima3
1The Ecological Technique and Engineering College, Shanghai Institute of Technology, No. 100 Haiquan Road, Fengxian District, Shanghai, 201418, China.
概括
机械碎片化改变了微塑料的特性,增加了重金属吸附. 通过碳基指数和O/C比率测量的衰老程度预测了这种增强的能力,这对于风险评估至关重要.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 微塑料 (MP) 经历环境老化,但机械碎片化对其性能和重金属相互作用的影响尚不清楚.
- 了解老年议员对于评估他们的环境风险和命运至关重要.
研究的目的:
- 研究微塑料 (聚乙烯,聚烯,PET) 在不同的老化条件下 (粉碎和球磨) 的机械碎片化行为.
- 用化学指数 (碳基指数,O/C比率) 来量化老化程度.
- 探索衰老对微塑料形态,内在性质和重金属吸附能力的影响.
主要方法:
- 模拟微塑料 (PS,PP,PET) 通过粉碎 (轻度) 和球磨 (重度) 的机械老化.
- 老化微塑料的形态特征,特定表面积,耐热性和水友性.
- 使用碳基指数 (CI) 和O/C比率量化老化程度.
- 对老化微塑料的重金属吸附能力的评估.
主要成果:
- 机械碎片化显著改变了微塑料的形态,球磨导致更深的老化 (颗粒尺寸更小,表面积更大,耐热性降低,水性性增加,含有更多氧气的组).
- 碳烯指数 (CI) 和O/C比率有效地衡量了老化程度.
- 老化增加了重金属的微塑料吸附能力,CI和O/C比率与这种增强的吸附相关.
结论:
- 机械碎片化是微塑料的关键衰老过程,显著改变其物理和化学特性.
- 该研究提出了一种机械碎片化的机制,并强调了CI和O/C比率在评估老年议员中的作用.
- 陈旧的微塑料表现出增强的重金属吸附,表明环境风险增加,可以使用化学索引来估计.
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