铁矿物质与微塑料产生的溶解有机物之间的相互作用阻碍了在分子尺度上揭示的费里化转化
Mengwei Zhang1, Ling Ding1, Xinran Qiu1
1College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
Environmental science & technology
|July 18, 2024
概括
微塑料衍生的溶解有机物 (MP-DOM) 影响铁矿物质的转化. MP-DOM 功能组与铁相互作用,改变铁化.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料衍生的溶解有机物 (MP-DOM) 是一个新的环境碳来源.
- MP-DOM与铁矿物之间的相互作用影响化 (Fh) 转化和MP-DOM命运.
- 控制这些相互作用的分子机制仍然不完全理解.
研究的目的:
- 为了研究MP-DOM和ferrihydrite之间的分子和原子级相互作用.
- 阐明这些相互作用对 Fh 转换和 MP-DOM 结构特征的影响.
- 识别影响矿物行为的特定MP-DOM组件.
主要方法:
- 里埃变换离子循环子子共振质谱 (FT-ICR MS) 用于DOM结构特征.
- 扩展X射线吸收细结构 (EXAFS) 光谱仪用于原子级矿物复合体分析.
- 使用了三种模型MP-DOM物质 (PS-DOM,PBAT-DOM,PE-DOM).
主要成果:
- MP-DOM的碳素和基组增加了Fe-O键的长度,抑制了FH的转化为血 (Hm).
- PS-DOM表现出最强的抑制,其次是PBAT-DOM和PE-DOM.
- 高分子量 (>360达) 具有高氧含量的和多环芳香化合物显示出更大的矿物质吸附.
结论:
- MP-DOM显著影响铁矿物转化通路.
- MP-DOM的特定分子特征决定了其相互作用强度和对化的影响.
- 这些发现为预测自然环境中的MP-DOM和铁矿物的行为提供了理论基础.
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