减少颗粒大小可以提高在污水污泥堆肥过程中微塑料的老化行为:物理化学性质和负载
Zhihao Liu1, Hongtao Liu2, Lixia Wang3
1Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China; College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China.
Journal of hazardous materials
|March 1, 2025
概括
较小的微塑料在堆肥过程中更快地老化,导致表面积增加和积累. 这种尺寸依赖的衰老影响了微塑料的环境命运和污染物负载.
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:
- 微塑料 (MP) 是一种持久性环境污染物.
- 有氧堆肥是一种潜在的MP降解方法.
- 在堆肥过程中MP大小对老化和污染物吸附的影响尚不清楚.
研究的目的:
- 研究在堆肥过程中聚乙烯基铁甲酸微塑料 (PET-MPs) 的尺寸依赖衰老.
- 为了确定MP大小对加 (Cd) 积累对老年PET-MPs的影响.
- 阐明MP大小在它们的环境命运和污染物负载中的作用.
主要方法:
- 不同尺寸的PET-MP的堆肥 (1.05.0毫米,0.21.0毫米和0.050.2毫米).
- 对老化PET-MPs的物理化学特性 (特定表面积,碳基指数,O/C比率) 的分析.
- 在老化PET-MPs表面的Cd度的量化.
主要成果:
- PET-MPs表现出尺寸依赖的衰老,较小的尺寸衰老更快.
- 最小的PET-MP (0.050.2毫米) 的特定表面积增长最大 (205.5%).
- 与较大的相比,Cd积累在较小的老化PET-MP (0.050.2毫米:5.37毫克/公斤) 上显着更高.
结论:
- 在堆肥过程中微塑料的老化受到颗粒大小的强烈影响.
- 较小的微塑料具有更大的表面积可吸附污染物,增加它们的环境风险.
- 了解尺寸依赖衰老对于预测微塑料的命运和污染物运输至关重要.
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