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和多醇基物质与污泥细胞外聚合物质的结合稳定性导致环境风险增加

Yu Zhang¹, Jiaqi Zhang¹, Liang Zhang²

¹College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China.

Journal of hazardous materials

|July 23, 2025

概括

-和多醇基物质 (PFAS) 与污泥细胞外聚合物物质 (EPS) 结合,形成复合物. perfluorooctanoic 酸 (PFOA) 的结合力比 perfluorooctane 硫酸盐 (PFOS) 强,增加了生态风险.

科学领域:

环境化学环境化学
环境科学环境科学
生物化学生化学

背景情况:

和多醇基物质 (PFAS) 是具有已知的生态风险的新兴污染物.
已经记录了PFAS与湖泊细胞外聚合物物质 (EPS) 的相互作用,但它们对污泥EPS的影响不太清楚.
污泥处理系统对于管理环境污染物至关重要.

研究的目的:

调查代表性PFAS (PFOA和PFOS) 和污泥EPS之间的分子相互作用.
阐明因PFAS与EPS结合而引起的结构和形状变化.
评估与这些PFAS-EPS复合体相关的生态风险.

主要方法:

利用光谱技术 (例如,FTIR,光) 来分析EPS结构.
采用分子对接和动态模拟来预测结合 afinities 和机制.
进行了植物毒性测试,以评估PFAS-EPS复合物的环境风险.

主要成果:

PFOA和PFOS都与污泥EPS形成了稳定的自组合复合体,改变了EPS构形和蛋白质二次结构.
与PFOS相比,PFOA对EPS的结合亲和力更强,这归因于增强的结合,疏水性相互作用和较低的结合能.
与EPS-PFOS复合体相比,EPS-PFOA复合体的植物毒性更高,这表明环境风险更大.

结论:

结合PFAS诱导污泥EPS的显著纳米规模重组,改变其特性.
与PFOS相比,PFOA对EPS的亲和力更强,导致不同的生态风险.
了解这些分子相互作用对于在污泥处理中管理PFAS和减轻环境危害至关重要.

关键词:

生物聚合物的生物聚合物.分子相互作用机制的分子相互作用机制.perfluorooctane 硫酸盐的使用情况 perfluorooctanoic 酸的含量是多少潜在的毒性潜在的毒性

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