在光衰老过程中,甲基八甲乙烯阻燃剂和膨胀聚烯微塑料之间的相互作用
Yanqi Shi1, Lezhou Zheng1, Hexinyue Huang1
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210093, China.
Chemosphere
|May 4, 2024
概括
甲基八聚乙烯阻燃剂 (MOBE) 通过促进表面变化和减肥来加速扩展聚乙烯 (EPS) 微塑料的降解. 添加剂-塑料相互作用显著影响微塑料的命运和环境风险.
科学领域:
- 环境科学 环境科学
- 聚合物科学 聚合物科学
- 材料化学 材料化学
背景情况:
- 扩展聚钢 (EPS) 是一个常见的塑料污染物,由于其浮力和光吸收.
- 阻燃剂被添加到EPS中,可能会改变其环境退化途径.
- 阻燃剂对EPS微塑料 (MP) 光衰老的影响仍未得到充分研究.
研究的目的:
- 调查甲基八乙烯阻燃剂 (MOBE) 对EPS微塑料光降解的作用.
- 为了比较阻燃剂添加EPS (FR-EPS) 和原始EPS (OR-EPS) 的光衰老行为.
- 了解添加剂-塑料相互作用在MP环境命运中的作用.
主要方法:
- 对FR-EPS和OR-EPS颗粒的光衰老实验室模拟.
- 分析颗粒大小的减少,表面形态变化 (孔形成) 和体重减轻.
- 使用碳基指数和O/C比率监测化学变化.
- 应用一个扩散模型 (Fick第二定律) 来追踪MOBE度.
主要成果:
- MOBE加速了EPS MP尺寸缩小和表面孔形成.
- 与OR-EPS相比,FR-EPS在36天辐射后的体重减轻显著增加 (40.85±3.72%).
- MOBE最初通过竞争光子来抑制光衰老,但后来通过产生基基 (•OH) 来促进降解.
- 由于EPS的吸光能力,也加速了MOBE的降解.
结论:
- 添加剂-塑料相互作用,特别是EPS中的MOBE,显著改变了MP光衰老行为.
- 有阻燃剂的商业EPS产品与纯EPS不同地降解.
- 这些相互作用对评估微塑料的环境命运和风险具有重要意义.
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