高密度聚乙烯
磨损(机械)
聚乙烯
碎片
塑料包装
材料科学
塑料废料
低密度聚乙烯
复合材料
碎片(计算)
加速老化
辐照
环境科学
工程类
废物管理
地质学
核物理学
物理
操作系统
海洋学
计算机科学
作者
Jing Gao,Liuwei Wang,Wei‐Min Wu,Jian Luo,Deyi Hou
标识
DOI:10.1016/j.jhazmat.2024.133615
摘要
Accumulation of plastic debris in the environment is a matter of global concern. As plastic ages, it generates microplastic (MP) particles with high mobility. Understanding how MPs are generated is crucial to controlling this emerging contaminant. In this study, we utilized high-density polyethylene (HDPE) plastic gauze, collected from urban settings, as a representative example of plastic waste. The plastic gauze was subjected to various aging conditions, including freeze-thaw cycling, mechanical abrasion, and UV irradiation. Following aging, the plastic gauze was rinsed with water, and the number of generated MPs were quantified. It was found that aged plastic gauze generated up to 334 million MP particles per m2 (> 10 µm) during rinsing, a number two orders of magnitude higher than unaged plastic. Fragmentation occurred in two dimensions for bulk MPs of all morphotypes. However, specific aging approaches (i.e., mechanical abrasion and UV irradiation) generated spheres and fibers via pseudo-3D fragmentation. Additionally, changes in molecular weight, size distribution, and surface oxidation characteristics unveiled a complex pattern (i.e., irregular changes with exposure time). This complexity underscores the intricate nature of plastic debris aging processes in the environment.
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