聚乙烯微塑料由藻类生物降解对它们的吸收特性和毒性的影响
Justyna Kapelewska1, Joanna Karpińska1, Urszula Klekotka2
1Department of Analytical and Inorganic Chemistry, Faculty of Chemistry, University of Bialystok, Ciolkowskiego 1K Street, 15-245, Bialystok, Poland.
Chemosphere
|December 20, 2024
概括
这项研究表明,藻类对微塑料的降解会产生吸收紫外线过器的生物膜. 微塑料对藻类也表现出毒性,诱导防御机制.
科学领域:
- 环境科学 环境科学
- 水生毒理学 水生毒理学
- 聚合物科学 聚合物科学
背景情况:
- 水生环境中的微塑料 (MP) 作为生物膜形成的表面,影响污染物运输.
- 高密度聚乙烯 (HDPE) 的藻类降解及其随后对紫外线过器吸收的影响是一个研究不足的领域.
- 紫外线过器是水生生态系统中令人担忧的新兴污染物.
研究的目的:
- 研究藻类降解HDPE (μ-HDPE) 对紫外线过器的吸收行为.
- 为了描述由Acutodesmus obliquus氧化后μ-HDPE的表面变化.
- 检查四个常见的紫外线过器在生物膜覆盖的HDPE (生物膜-HDPE) 上同时吸附的情况.
主要方法:
- 使用红外光谱学 (IR),扫描电子显微镜 (SEM) 和孔径学进行表面分析.
- 对紫外线过器 (二,4-甲基基烯,二,三,二) 在生物膜HDPE上的同时吸附实验.
- 动力和同热模型 (伪二阶,兰木尔,线性模型).
- 生物测试以评估μ-HDPE对A. obliquus生长,生化成分和抗氧化剂反应的影响.
主要成果:
- 在μ-HDPE表面上观察到生物膜的形成和碳基/双键组的存在.
- 吸附动力学遵循伪二阶模型,以薄膜扩散为速度限制步骤.
- 兰穆尔模型最好地描述了4-甲基基烯,二和二的吸附,而线性模型适合三.
- 疏水性相互作用,范德瓦尔斯力,静电和π-π结合被确定为关键的吸附机制.
- HDPE抑制了A. obliquus的生长并减少了蛋白质,糖和叶绿素,但增加了抗氧化酶活性和抗氧化剂含量,表明毒性和诱导的防御机制.
结论:
- 通过各种相互作用,HDPE的藻类降解产生生物膜-HDPE,具有显著的紫外线过器吸附能力.
- 这项研究提供了首个证据,表明UV过器同时吸收到生物膜-HDPE上.
- μ-HDPE对A. obliquus表现出毒性,触发细胞防御机制.
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