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在水生环境中微纤维的光降解过程和气候变化产品

Shimaa M Kteeba^1,2, Laodong Guo¹

¹School of Freshwater Sciences, University of Wisconsin─Milwaukee, Milwaukee, Wisconsin 53204, United States.

Environmental science & technology

|August 31, 2024

概括

光降解实验显示微纤维 (MFs) 持续释放溶解有机物 (DOM) 并经历表面变化. 烯酸,尼龙和聚MF表现出不同的反应性,影响其环境命运.

科学领域:

环境科学环境科学
聚合物化学聚合物化学
摄影化学的使用.

背景情况:

微塑料,特别是微纤维 (MF),是普遍存在的环境污染物.
对于MFs在环境中的光化学行为,降解产物和最终命运,我们还不太了解.

研究的目的:

研究常见微纤维 (聚,尼龙,烯酸) 的光化学降解途径.
描述气候变化的产物和聚合物结构和表面形态的变化.
通过光降解来确定微纤维的环境命运.

主要方法:

在聚 (POL),尼龙 (NYL) 和 (ACR) 微纤维上进行了光降解实验.
分析了溶解有机碳 (DOC),染色溶解有机物 (CDOM) 和光元件.
利用扫描电子显微镜 (SEM) 和拉曼光谱技术进行形态和结构分析.

主要成果:

气候变化导致DOC,CDOM和光度增加,这表明DOM持续释放.
SEM和拉曼光谱显示了表面形态和聚合物光谱的改变.
释放的DOM/纳米塑料具有负电荷 (128-374nm),DOM芳香度下降,光谱斜率增加.
光化学反应率按照以下顺序进行:烯酸 > 尼龙 ≥ 聚.

结论:

微纤维经历光化学降解,释放DOM并改变其物理和化学特性.
降解速度和产品根据微纤维聚合物类型而异.
这些发现提高了对微纤维环境命运和反应性的理解.

关键词:

溶解的有机物质是一种有机物质.环境命运环境命运环境命运微纤维是一种微纤维.微塑料微塑料的使用纳米塑料是一种纳米塑料.通过光化学降解降解.表面的特性表面的特性

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