新兴的研究人员系列:在紫外线照射下基于微塑料的浸出物形成:范围,特征和机制
Ashton Collins1, Mohamed Ateia2, Kartik Bhagat3
1Department of Civil and Environmental Engineering, University of Maine, Orono, ME 04473, USA.
Environmental science : water research & technology
|January 23, 2024
概括
紫外线 (UV) 照射会从微塑料中释放有机物质,增加溶解的有机物和表面碳酸含量. 这一过程对聚乙烯尤为重要,为水生环境提供有机化合物.
科学领域:
- 环境化学环境化学
- 聚合物科学 聚合物科学
- 水生毒理学 水生毒理学
背景情况:
- 微塑料污染是水生系统中普遍存在的问题,对环境和公共健康构成风险.
- 了解微塑料的降解过程,特别是在紫外线等环境压力因素下,至关重要.
研究的目的:
- 为了研究暴露于紫外线辐射的六种微塑料的表面相互作用和液生产.
- 确定在紫外线压力下从微塑料中释放有机物质的动力学和机制.
主要方法:
- 使用溶解有机含量 (DOC),UV254吸收率和激发发射矩阵 (EEM) 光分析液.
- 使用富里埃变换红外光谱 (FT-IR),拉曼光谱和X射线光电子光谱 (XPS) 进行老化微塑料的表面表征.
- 取决于温度的实验,以阐明出水机制.
主要成果:
- 紫外线照射始终增加了DOC,UV254吸收率和EME强度,表明有机物释放.
- 聚乙烯表现出有机物最显著和最快速释放,其次是树脂涂层聚乙烯.
- 表面分析显示,所有老化微塑料的碳化合物指数都在增加,聚烯的增加率最高.
- 泄漏机制被确定为内热,其中的变化归因于聚合物组成和紫外线反应性.
结论:
- 紫外线辐射诱导了界面相互作用,导致微塑料释放有机化合物.
- 微塑料液是自然水域有机物流入的潜在重要来源.
- 这些发现突显了微塑料通过光降解降解对环境的影响.
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