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PFAS对二次微塑料的吸附:一个机理学研究

Omobayo A Salawu¹, Christopher I Olivares¹, Adeyemi S Adeleye²

¹Department of Civil and Environmental Engineering, University of California, Irvine, CA 92697-2175, USA; The Water-Energy Nexus Centre, University of California, Irvine, CA 92697-2175, USA.

Journal of hazardous materials

|April 5, 2024

概括

在水生环境中,-和多基基物质 (PFAS) 迅速分裂成微塑料 (MP). 像pH值和天然有机物质这样的因素会影响PFAS对二次MP的吸附.

科学领域:

环境化学环境化学
环境科学环境科学
聚合物科学聚合物科学

背景情况:

微塑料 (MP) 是水生系统中普遍存在的环境污染物.
国会议员可以吸收和运输有害化学物质,包括和多基物质 (PFAS).
对于 PFAS 分成二级MP的机制理解有限.

研究的目的:

为了研究水的物理化学性质对二次MP的PFAS吸附的影响.
为了确定PFAS吸附的热力学自发性和动力学.
为了阐明pH值,自然有机物 (NOM),离子强度和温度的作用.

主要方法:

批量吸附实验使用来自PET水瓶的二次MP进行.
在不同的pH值,NOM度,离子强度和温度下测量PFAS吸附.
分析了热力学参数 (吉布的自由能量) 和吸附动力学.

主要成果:

在25°C时,PFAS对二次PETMP的吸附是热力学自发的 (ΔG = -16到 -23 kJ/mol),由的增加驱动.
在7-9小时内达到吸附平衡,表明水生系统的快速分割.
自然有机物通过电排斥抑制了PFAS吸附;更高的离子强度通过减少静电排斥增强了吸附;由于静电排斥增加了pH,阻碍了吸附.

结论:

在淡水和盐水环境中,PFAS迅速分裂为二级PETMP.
水的化学作用显著调节了PFAS对MP的吸附,这对污染物运输有影响.
结果为MP-PFAS相互作用的预测建模提供了基础数据.

关键词:

化工物质是一种化物.永远的化学品永远的化学品塑料塑料是一种塑料.水的化学反应

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