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可生物降解的聚乳酸微塑料的衰老行为由UV/H₂O₂过程加速

Hang Liu¹, Qingxin Jiao¹, Ting Pan¹

¹Department of Environmental Science and Engineering, Research Centre for Resource and Environment, Beijing University of Chemical Technology, Beijing, 100029, People's Republic of China.

|July 1, 2023

概括

可生物降解的塑料制品形成了进入水生环境的微塑料 (MP). 这项研究揭示了它们的衰老和吸附行为与纯微塑料不同,影响了环境风险评估.

科学领域:

环境科学环境科学
聚合物科学聚合物科学
材料科学材料科学材料科学

背景情况:

全球塑料限制导致生物降解塑料的使用增加.
来自生物降解产品的微塑料 (MP) 正在进入水生生态系统.
这些塑料产品衍生MPs (PPDMPs) 的环境行为尚未得到充分理解.

研究的目的:

研究聚乳酸 (PLA) PPDMPs的衰老过程和环境行为.
为了比较PLA PPDMPs与纯PLA MPs的衰老和吸附.
提供有关生物降解MPs对环境风险的见解.

主要方法:

在UV/H2O2条件下,PLA吸管和食品袋的动态老化.
使用扫描电子显微镜 (SEM) 进行分析.
通过二维里埃变换红外相关谱 (2D-COS) 和X射线光电子谱 (XPS) 进行表征.

主要成果:

而PLA PPDMP的衰老速度比纯PLA MP慢.
衰老期间的功能组响应顺序在PPDMP和纯MP之间有所不同.
与PPDMP相比,纯PLAMP在衰老后显示出更大的吸附能力增加.

结论:

PLA PPDMPs的衰老机制涉及含氧组的初始反应,随后是C-H/-C-C反应和脊柱破裂.
纯PLAMP经历初始氧化,脊椎骨折,然后进一步氧化.
老化和吸附的差异凸显了对生物降解的MP进行特定风险评估的需要.

关键词:

在 2D-COS 中.动态老龄化动态老龄化微塑料是一种微塑料.塑料产品的衍生性塑料产品的衍生性聚乳酸是一种多乳酸.

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