低估了三 (2-乙烯) 酸盐在水环境中的光降解,由聚乙烯微塑料引起的环境风险
Nannan Wu1, Haibin Yu2, Zhenzhen Liu2
1State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, PR China; State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
Water research
|January 1, 2025
概括
老化聚烯微塑料 (PS-MPs) 通过产生更具反应性的氧物种 (ROS) 显著增强了三-2-乙烯酸盐 (TCEP) 的光降解. 一些降解产品比TCEP更有毒,增加了环境风险.
科学领域:
- 环境化学环境化学
- 聚合物科学 聚合物科学
- 摄影化学的使用.
背景情况:
- 三二乙酸 (TCEP) 是一种常见的阻燃剂和可塑剂,在水生环境中与聚烯微塑料 (PS-MPs) 一起发现.
- TCEP和PS-MP的联合存在引起了人们对它们的环境命运和潜在风险的担忧.
研究的目的:
- 研究原始和老PS-MPs对TCEP光降解的促进作用.
- 阐明反应机制并评估与PS-MPs增强TCEP光降解相关的环境风险.
主要方法:
- 在原始和老化PS-MPs的存在下对TCEP光降解的实验观察.
- 量化反应性氧物种 (ROS) 的产生,包括基基 (•OH),超氧基 (O2•-),单片氧 (1O2).
- 使用密度函数理论 (DFT) 计算和毒性评估识别TCEP降解产物和相互作用产物.
主要成果:
- 与原始PS-MP相比,老年PS-MP显示TCEP光降解的显著增强,归因于更高的ROS生成 (OH产量21倍以上).
- •OH,O2和O2分别为59.07%,34.98%和7.8%的比例对老年PS-MPs引起的TCEP降解作出了贡献.
- DFT计算表明,OH优先攻击TCEP的原子. 确定了TCEP衍生物和PS-MP之间形成的相互作用产物,其中一些具有比TCEP更高的毒性.
结论:
- 特别是老年PS-MPs通过产生ROS促进TCEP光降解.
- 潜在更有毒的相互作用产品的形成凸显了TCEP和PS-MP联合污染的低估的转化风险.
- 这项研究提供了对共发生的微塑料和塑料添加剂的环境命运和生态风险的关键见解.
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