阳光衰老对环境微塑料的物理化学性质和吸收能力的影响:对PAHs污染的影响
1Department of Environmental and Civil Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu-Shi, Toyama, 939-0398, Japan. ksankoda@pu-toyama.ac.jp.
概括
紫外线老化显著增加了聚乙烯 (PE) 和聚烯 (PP) 微塑料吸附多环芳 (PAH) 的能力. 陈旧的塑料表面加速了这些环境污染物的积累.
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,包括聚乙烯 (PE),聚烯 (PP) 和聚烯 (PS),是普遍存在的环境污染物.
- 了解塑料的老化过程对于评估其对环境的影响和与其他污染物的相互作用至关重要.
研究的目的:
- 研究紫外线 (UV) 衰老对PE,PP和PS的物理化学特性的影响.
- 评估紫外线诱导的老化如何影响这些塑料对多环芳的吸附能力,使用烯作为模型化合物.
主要方法:
- 塑料样品 (PE,PP,PS) 经过模拟太阳光 (基于Xe) 和自然户外暴露,经过加速老化.
- 分析了原始和老化的塑料的物理化学特性.
- 进行了吸附实验,以量化原始和老化的塑料颗粒对烯的吸收.
主要成果:
- 暴露在户外的PP和PS样本显示出明显的富里埃变换红外线 (FTIR) 峰值,表明碳基组的形成.
- 与原始样品相比,在室外老化69天的塑料中,烯的吸附系数显著更高 (2.9x PE,3.5x PP).
- 表面性质的变化,如脆化,可能有助于增加吸附能力.
结论:
- 紫外线老化改变了常见微塑料的表面特性,提高了它们吸附PAHs的能力.
- 陈旧的微塑料可以加速PAHs在环境中的积累.
- 需要进行模拟自然阳光暴露的进一步研究,才能充分理解PAH在老化微塑料上的积累.
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