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聚乙烯微/纳米塑料表面功能组对在老化过程中从花中释放NOM的作用

Yi Yan¹, Hui Xu², Zijie Wang³

¹Chang' an University, Xi'an, Shaanxi 710061, China.

Journal of hazardous materials

|May 8, 2024

概括

微塑料,特别是纳米尺寸的微塑料,在水处理中的花老化过程中显著影响自然有机物 (NOM) 的释放. 这种相互作用减少了溶解有机碳 (DOC) 和消毒副产品 (DBPs).

科学领域:

环境化学环境化学
水处理处理水的方法
材料科学材料科学材料科学

背景情况:

微塑料污染在水处理过程中越来越令人担忧.
以前的研究集中在微塑料去除效率上,忽视了与自然有机物 (NOM) 的相互作用.
基凝固剂 (Al13,AlCl3) 是常用的,但它们在老化过程中与微塑料和NOM的相互作用尚不清楚.

研究的目的:

为了研究聚烯微/纳米颗粒在基花老化过程中对NOM释放的影响.
阐明微塑料,凝固剂和NOM之间的相互作用机制.
评估这些相互作用对消毒副产品 (DBP) 的形成的影响.

主要方法:

使用Al13和AlCl3与聚乙烯微/纳米粒子进行凝固实验.
长达7年的花老化研究.
溶解有机碳 (DOC) 含量的分析.
使用π-结合,疏水性相互作用和功能组分析对相互作用的表征.
消毒副产品 (DBP) 的量化,包括TCAA,DCAA,TBM,DBCM和尼托胺.

主要成果:

纳米颗粒由于尺寸较小和聚合,与凝固剂的相互作用更大.
7年老化后,纳米塑料系统的DOC含量减少了40%以上,微塑料系统的变化最小.
聚乙烯的环通过π-结合与离子形成复合物,产生新的Al-O键.
在微/纳米塑料接口上发生了NOM吸附,这是由于疏水性相互作用和 conformational entropy.
添加纳米塑料可以将几种DBP (TCAA,DCAA,TBM,DBCM,尼托胺) 降低50%以上.

结论:

微/纳米塑料,特别是纳米大小的颗粒,在老化过程中显著影响NOM释放和DBP形成.
相互作用机制包括π-结合,疏水性相互作用和微塑料表面的功能组化学.
了解这些相互作用对于优化水处理过程和减轻与微塑料污染相关的风险至关重要.

关键词:

在 Al form 中使用.凝血是凝固的过程.叶片老化叶片老化微型/纳米塑料颗粒 NOM 的变化.

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