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阿根廷园艺土壤中的聚乙烯碎片:环境转化为复合材料

David Picón Borregales¹, Leticia Pastormerlo², Eduardo Reciulschi³

¹Instituto de Ciencias, Universidad Nacional de General Sarmiento (UNGS), J. M. Gutiérrez 1150, B1613GSX Los Polvorines, Prov. de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina.

The Science of the total environment

|February 13, 2025

概括

在土壤中经过气候变化的聚乙烯塑料变得更加粗和氧化,增强它们吸收重金属的能力,如和. 这种转变主要是由于塑料表面本身的变化,而不仅仅是粘附于土壤颗粒.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
土壤科学土壤科学

背景情况:

聚乙烯 (PE) 塑料是农业土壤中发现的持久性环境污染物.
环境气候变化改变了塑料的物理化学特性,影响了它们与土壤成分的相互作用.

研究的目的:

在园艺土壤中暴露后,研究聚乙烯宏观,中型和微型塑料的物理化学转化.
为了确定气候对塑料表面性能和重金属吸附能力的影响.

主要方法:

使用扫描电子显微镜 (SEM) 和原子力显微镜 (AFM) 分析塑料样品.
通过富里埃转换红外光谱法 (FTIR) 进行表面表征,以确定碳和基指数.
重金属 (Ni2+,Pb2+,酸盐) 吸附实验在经过气候变化和原始PE.
用化学处理 (酸) 去除粘附的土壤颗粒.

主要成果:

经过气候变化的PE显示表面粗度增加 (从0.44nm到1.60nm) 和氧化 (较高的碳和基指数).
与原始PE相比,经过气候变化的塑料对Ni2+ (4.5倍) 和Pb2+ (11倍) 的吸收显著更高.
金属吸附主要归因于修改后的塑料表面,而不是粘附的粘土颗粒.

结论:

环境气候显著改变聚乙烯塑料表面,增加它们对阴离子重金属吸附的能力.
了解这些转变对于评估农业土壤塑料污染对环境的风险至关重要.
开发了一种新的ATR-FTIR方法,用于量化塑料表面上的酸盐.

关键词:

园艺园艺园艺园艺巨型塑料是什么巨型塑料是什么介质塑料是一种介质塑料.微塑料是一种微塑料.土壤土壤土壤.气候变化气候变化

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