在光氧化下从可生物降解和常规塑料中进行动态老化和浸的溶解有机碳的表征
Yue Yu1, Yu Yao2, Tanveer M Adyel3
1Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing, 210098, China; Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zurich, 8093, Switzerland.
Journal of environmental management
|November 19, 2023
概括
生物降解塑料在降解过程中可能会比传统塑料释放更多的溶解有机碳. 这突显了污染物漏的生态风险,需要对所有塑料类型进行监测.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
背景情况:
- 塑料污染是一个全球性的危机,可生物降解塑料被提出作为可持续的替代品.
- 可生物降解塑料在环境压力下 (如光氧化) 的老化和漏行为仍然不太清楚.
- 将可生物降解塑料和传统塑料的降解途径进行比较,对于评估它们真正的环境影响至关重要.
研究的目的:
- 在光氧化过程中研究和比较可生物降解和不可生物降解塑料的老化和漏特性.
- 量化在降解和浸出阶段释放的溶解有机碳.
- 评估与不同类型塑料的漏污染物相关的潜在生态风险.
主要方法:
- 将五种塑料类型 (三种非生物降解,两种生物降解) 进行21天的光氧化,然后在黑暗中进行13天.
- 使用扫描电子显微镜分析表面形态变化.
- 使用碳基指数,氧与碳的比率以及接触角的测量量量化老化.
- 使用激发发射矩阵光谱学识别和特征化溶解有机碳 (DOC).
主要成果:
- 与非生物降解塑料相比,生物降解塑料并不总是表现出更高的衰老程度.
- 可生物降解塑料显示出释放更多数量和更多种类的溶解有机碳的潜力.
- 聚乳酸是一种生物降解塑料,比测试的传统塑料具有更高的度和更多样化的DOC释放.
- 这项研究揭示了这两种塑料类别中有机污染物的大量泄漏.
结论:
- 塑料的老化过程和随后的有机污染物从塑料中漏需要仔细监测,不管它们的生物降解性如何.
- 生物降解塑料,特别是聚乳酸,由于释放溶解的有机碳,可能会带来不可忽视的生态风险.
- 进一步的研究是必不可少的,以充分了解从降解塑料中出的物质对环境的命运和影响.
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