微塑料在水环境中的臭氧介导分解
Markus A B Wieland1,2, Sebastian P Schwaminger3,4, Matthias Elinkmann1
1NanoMicroLab, Institute of Chemistry, University of Graz Graz Austria.
Journal of analytical atomic spectrometry
|September 11, 2025
概括
使用臭氧的先进氧化过程 (AOP) 可以分解微塑料 (MP),但可能会产生有害的纳米塑料 (NP). 新的分析方法对于评估AOPs至关重要.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 材料科学 材料科学 材料科学
背景情况:
- 先进的氧化过程 (AOP) 对于降解废水中的持久污染物,包括微塑料 (MP),至关重要.
- 大众分子分裂成更小的粒子,增加了移动性和生物吸收的潜力,造成环境风险.
- 目前对AOP在去除MP和纳米塑料 (NP) 方面的效率的理解受分析挑战和对不完全降解的担忧所限制.
研究的目的:
- 通过使用臭氧 (AOPs的关键组成部分) 调查各种微塑料 (MPs) 的降解.
- 在臭氧处理过程中评估纳米级塑料 (NP) 的形成.
- 评估单颗粒感应合等离子体 - 质谱学 (SP ICP-MS) 和动态光散射 (DLS) 在分析MP降解和NP形成中的有效性.
主要方法:
- 主要 (聚乙烯,PTFE) 和次要 (PMMA,PVC) MPs 暴露于臭氧.
- 使用动态光散射 (DLS) 进行NP形成的定性评估.
- 使用单粒子感应合等离子体 - 质谱法 (SP ICP-MS) 进行MP质量减小和转换的定量分析.
主要成果:
- 对臭氧的暴露导致了聚钢 (PS) 和聚甲酸 (PMMA) MP 的逐渐减少.
- 聚四乙烯 (PTFE) 和聚乙烯 (PVC) 显示出对臭氧氧化的更高抵抗力.
- SP ICP-MS提供了详细的质量转换数据,而DLS证实了所有测试的MP类型中纳米塑料的形成.
结论:
- 基于臭氧的AOP可以有效地减少MP质量,但可能无意中产生纳米塑料 (NP).
- 该研究强调了通过考虑转化产品的形成和特征来评估AOP效率的关键需要,而不仅仅是颗粒去除.
- 综合SP ICP-MS和DLS为MP降解途径和NP生成提供了宝贵的见解,这对于优化新法规下的废水处理策略至关重要.
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