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悬浮沙度对传统和可生物降解的塑料碎片表面老化的影响

Yongyu Chen¹, Tanveer M Adyel², Qianqian Zheng³

¹Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, People's Republic of China.

Journal of hazardous materials

|July 3, 2025

概括

悬浮沙对塑料老化有影响,对传统塑料和可生物降解塑料的影响不同. 传统的聚烯 (PP) 衰老速度比可生物降解塑料快,强调需要考虑沙子.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
聚合物科学聚合物科学

背景情况:

塑料废物带来了严重的环境污染挑战.
塑料因紫外线,热和微生物等环境因素的老化已经得到了充分的证据.
悬浮沙对塑料老化的影响仍然不太清楚.

研究的目的:

研究悬浮沙子对各种塑料表面老化的影响.
在悬浮沙条件下比较传统塑料 (PET,PP) 和可生物降解塑料 (PLA+PBAT,SBP) 的衰老率.
阐明悬浮沙子影响塑料降解的机制.

主要方法:

在室内实验中,PET,PP,PLA+PBAT和SBP在0,14,28和42天内暴露在悬浮沙子中.
使用碳基指数测量和X射线光电谱 (XPS) 分析表面变化的分析.
测量接触角,以评估表面的水友性变化.

主要成果:

对于PET,PP和SBP,碳нил指数增加,表明氧化,而PLA+PBAT显示下降.
所有塑料的氧与碳 (O/C) 比率都增加,其中PP的增幅最为显著.
所有塑料的接触角都下降了,这意味着增加了水友性,最显著的是PLA+PBAT.
悬浮沙显示了双重效应:在低度下通过磨损加速老化,在高度下通过阴影减缓氧化.
老化速率的顺序被确定为PP>SBP>PLA+PBAT>PET.
衰老过程涉及光氧化,其次是微裂变和颗粒破裂.

结论:

悬浮沙对塑料表面的老化有很大影响,对不同类型的聚合物有不同的影响.
在这些条件下,像PP这样的传统塑料可以比一些可生物降解塑料表现出更快的老化率.
这些发现强调了考虑悬浮沙在塑料环境退化中的作用的重要性,特别是在水生生态系统中.

关键词:

衰老的特征衰老的特征动态变化动态变化机械磨损导致的塑料碎片塑料碎片塑料碎片悬浮沙中的度是悬浮沙中的度.

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