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溶解的黑碳促进了微塑料的光降解,通过分子重量依赖的反应中间体生成

Qin Ou^1,2, Yanghui Xu^1,2, Xintu Wang^1,3

¹Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.

Environmental science & technology

|August 12, 2024

概括

溶解的黑碳 (DBC) 通过产生活性氧物种来加速微塑料 (MP) 的光降解. 低分子量DBC增强了降解,而高分子量DBC可以抑制它,这取决于化学性质.

科学领域:

环境化学环境化学
摄影化学的使用.
聚合物科学聚合物科学

背景情况:

阳光诱导的光降解对水生系统中微塑料 (MP) 的命运至关重要.
溶解黑碳 (DBC) 是一种光敏感剂,可能会影响MP光降解.

研究的目的:

研究木制DBC对聚乙烯 (PS) 微塑料的紫外线诱导光降解的影响.
阐明DBC介导的MP光降解的机制和影响因素.

主要方法:

暴露PS MPs在水溶液中的紫外线辐射与DBC.
对光降解路径和反应性氧物种生成的分析.
DBC分子量和化学特性与光降解率的相关性.

主要成果:

PS MP光降解主要通过基基 (•OH) 和单片氧 (1O2) 向环.
DBC通过增加OH,1O2和三次激发状态DBC (3DBC*) 的产生来增强PS MP光降解.
使用碳基的低MW DBC (<3 kDa) 加快了降解,而使用芳香的高MW DBC (>30 kDa) 通过清理 •OH.抑制了降解.

结论:

DBC显著影响聚乙烯微塑料的紫外线诱导的光降解.
DBC的分子量和化学成分是调节其对MP光降解影响的关键因素.
了解DBC-MP相互作用对于预测水生环境中的微塑料命运至关重要.

关键词:

溶解的黑色碳是什么?微塑料微塑料的使用分子重量的分子质量.通过光降解进行光降解.反应性中间体反应性中间体

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