微塑料衍生的溶解有机物质在石上的分子转化和光化学反应性:对持久性和活性氧物种动态的影响
Daofen Huang1, Ling Ding2, Xinran Qiu2
1College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan 410082, China.
Water research
|September 10, 2025
概括
微塑料衍生的溶解有机物 (DOM) 与矿物相互作用,改变其光反应性. 戈伊的吸附改变了DOM结构,影响了活性氧物种 (ROS) 的产生和持久性.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 摄影化学的使用.
背景情况:
- 微塑料 (MP) 将溶解的有机物 (DOM) 纳入环境池中.
- 对于MP-DOM与矿物之间的分子相互作用以及它们对光反应性的影响,人们的了解很少.
研究的目的:
- 为了阐明MPs-DOM在石相互作用期间的结构依赖分子转换.
- 研究这些转换对DOM光反活性和反应性氧物种 (ROS) 动态的影响.
主要方法:
- 里叶变换离子循环子子共振质谱法 (FT-ICR MS) 用于分析DOM分子结构.
- 评估基 (•OH),单氧 (1O2) 和三次激发的DOM (3DOM*) 动态.
主要成果:
- 通过去除电子捐赠群体,戈伊的吸附降低了OH的产生.
- 单点氧 (1O2) 由于持续的芳香光敏感剂而保持稳定.
- 3DOM*趋势不同:HA和PBAT-DOM下降,FA和PS-DOM增加,PE-DOM的变化很小.
- FT-ICR MS揭示了结构变化,包括PS-DOM中的硫化和PBAT-DOM中的水解.
结论:
- 戈伊提特选择性地吸附自然DOM成分,丰富氧化还原活性芳香物.
- 戈伊相互作用通过硫化和化等过程促进了MPs-DOM的持久性.
- 与矿物质的MPs-DOM相互作用显著改变环境DOM池和光活性.
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