[a]二烯在农业土壤中微塑料介导的吸附过程和机制
Zhengyi Zhu1,2, Lijuan Sun1, Qin Qin1,3
1Eco-Environment Protection Research Institute, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China.
Toxics
|January 8, 2025
概括
聚乙烯 (PVC) 微塑料通过π-π相互作用显著增强土壤对[a]烯 (BaP) 的吸附. 这项研究揭示了微塑料作为有机污染物的载体,影响它们在土壤中的环境命运.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料和甲 (BaP) 在环境中共存,对它们在农业土壤中的相互作用的研究有限.
- 由于这两种污染物对环境有很大的毒性,了解这些相互作用至关重要.
研究的目的:
- 研究微塑料 (聚乙烯 (PE),聚烯 (PS),聚乙烯 (PVC)) 和土壤中的BaP之间的早期吸附机制.
- 确定不同微塑料对BaP吸附及其潜在机制的影响.
主要方法:
- 进行了吸附热力学和动力学实验.
- 使用扫描电子显微镜 (SEM),X射线光电子光谱 (XPS) 和富里埃变换红外光谱 (FTIR) 进行了表面表征.
- 密度函数理论 (DFT) 模拟被用来计算结合能.
主要成果:
- 聚乙烯微塑料表现出最高的BaP吸附能力,由π-π相互作用和增加的疏水性驱动.
- 在土壤微塑料系统中,BaP主要吸附在微塑料上,而PVC增加了3.69倍的土壤吸附能力.
- 与未经处理的PVC和其他微塑料相比,DFT模拟表明,与土壤预处理的PVC相比,BaP的结合能量更强.
结论:
- 微塑料,特别是PVC,在农业土壤中充当BaP的有效载体,显著改变其环境行为.
- 土壤预处理提高了PVC对BaP的吸附稳定性,阐明了土壤微塑料系统中增加吸附的机制.
- 这些发现为评估微塑料和相关有机污染物的环境风险提供了理论支持.
相关概念视频
Bioremediation
18.2K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.2K
Environmental Applications of Microorganisms
1
Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
1
Microorganisms in Agriculture and Food industry
Microorganisms play a crucial role in agriculture and the food industry, contributing to soil fertility, crop protection, and food production. Their functions range from nitrogen fixation and biopesticide production to fermentation and food preservation, making them indispensable to sustainable farming and food safety.Role in AgricultureNitrogen-fixing bacteria, such as Rhizobium (symbiotic) and Azotobacter (free-living), convert atmospheric nitrogen into ammonia through biological nitrogen...


