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一个基于ReaxFF的分子动力学研究,研究了由于超声波导致的PFAS的破坏

Bruno Bezerra de Souza¹, Shaini Aluthgun Hewage¹, Jitendra A Kewalramani¹

¹Department of Civil and Environmental Engineering, New Jersey Institute of Technology, Newark, NJ, USA.

Environmental pollution (Barking, Essex : 1987)

|June 14, 2023

概括

这项研究解释了超声波如何使用计算模拟来破坏和多基物质 (PFAS). 高温迅速降解PFAS,形成小的基,阻碍了完全矿化.

科学领域:

环境化学环境化学
计算化学计算化学
材料科学材料科学材料科学

背景情况:

和多醇基物质 (PFAS) 是广泛存在的环境污染物,对人类有显著的毒性.
超声波技术在PFAS降解方面表现有前途,但潜在的机制需要详细调查.

研究的目的:

为超声波诱导的 PFAS 在水中的破坏提供计算,机械解释.
阐明在模拟超声波条件下参与PFAS降解的反应途径和关键中间体.

主要方法:

使用基于ReaxFF的分子动力学模拟.
在温度从373K到5000K之间进行了模拟.
模拟了各种环境,包括水蒸气,O2,N2和空气.

主要成果:

超过98%的PFAS降解在8秒内在5000K的水蒸气中实现,模仿超声波效应.
小链基产物 (C1和C2) 被确定为主导物种和有效降解的障碍物.
PFAS的矿化发生在没有产生可检测的副产品的情况下,与经验观察一致.

结论:

计算模拟提供了一个强大的工具来补充关于PFAS降解的实验研究.
了解基中间体的作用对于优化基于超声波的PFAS整治策略至关重要.
这些发现支持使用超声波技术对PFAS的无副产品矿化潜力.

关键词:

分子动力学模拟模型有机污染物有机污染物在PFAS中矿化.这就是PFOA的PFOA.perfluorinated 化学物质是一种含有多的化学物质.

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