可生物降解塑料在亚热带露天和海洋环境中的降解效率:对塑料污染的影响
Coco Ka Hei Cheung1, Christelle Not1
1Department of Earth Sciences, The University of Hong Kong, Pokfulam, Hong Kong; The Swire Institute of Marine Science, The University of Hong Kong, Pokfulam, Hong Kong.
The Science of the total environment
|May 26, 2024
概括
大多数生物塑料在六个月内不会在自然环境中完全降解. 聚乳酸 (PLA) 在海洋环境中显示完全分解,这表明改善可生物降解塑料溶液的潜力.
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:
- 越来越多地使用生物塑料来打击塑料污染.
- 关于生物塑料在自然环境中的实际可降解性的不确定性.
- 需要在不同条件下对生物塑料降解的经验数据.
研究的目的:
- 评估各种生物塑料的现场降解效率.
- 为了比较露天与海洋环境中的降解率.
- 评估塑料类型 (生物基与化石基) 对降解的影响.
主要方法:
- 在香港的露天和海洋环境中进行的现场降解实验.
- 测试三种生物塑料类型:添加剂修改的低密度聚乙烯 (LDPE),聚乳酸 (PLA) 和聚乙醇 (PVA) /粉混合物.
- 在六个月的时间内监测视觉存在和质量损失.
主要成果:
- 大多数经过测试的生物塑料在六个月后显示不完全降解.
- 聚乳酸 (PLA) 在海洋环境中在1-3个月内实现了100%的分解.
- 生物基塑料 (PLA,PVA/粉) 的质量损失比化石基改性LDPE的质量损失更大.
- 在海洋环境中,PLA和PVA/大麻粉降解得更好;在户外环境中,改性LDPE和PVA/玉米粉降解得更好.
- 所有测试的塑料都显示出碎片化的迹象,引发了人们对微塑料生成的担忧.
结论:
- 亚热带海洋环境可能会增加PLA的退化.
- 降解机制各不相同:在海洋中的生物降解/水解,在露天的非生物氧化.
- 目前生物塑料的标签不足,缺乏关于碎片化和实际降解的信息.
- 进一步的研究至关重要,以了解从降解生物塑料中形成的微塑料.
- 需要改善关于生物塑料实际环境性能的消费者信息.
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