探索污泥脱水剂对水热处理下微塑料老化的影响:从聚乳酸微塑料的见解
Yang Yu1, Yindi Ding1, Chenjia Miao1
1School of Energy and Environment, MOE Key Laboratory of Environmental Medicine Engineering, Southeast University, Nanjing, 210096, China.
Environmental research
|October 23, 2023
概括
水热处理与脱水剂相结合,显著改变了聚乳酸微塑料 (PLA-MPs). 铁/氧硫酸盐 (Fe/PMS) 显著降低了水中的分子量,增加了含氧功能组.
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:
- 微塑料污染,特别是聚乳酸 (PLA) 的污染,是一个日益严重的环境问题.
- 了解PLA微塑料 (PLA-MPs) 在各种处理条件下的转化对于补救策略至关重要.
研究的目的:
- 调查水热处理和脱水剂对PLA-MPs的联合作用.
- 分析这些治疗对PLA-MPs产生的形态,分子和功能变化.
主要方法:
- 扫描电子显微镜 (SEM) 用于表面形态.
- 里埃变换红外光谱 (FTIR) 和X射线光电子光谱 (XPS) 用于分子和功能组分析.
- 用于分析光谱变化序列的二维相关谱学.
主要成果:
- 脱水剂 (PFS,PAC,Fe/PMS) 引发了明显的表面变化 (多孔性,粗性,恶化).
- 铁/PMS显著降低了水中的PLA-MP分子量,但在污泥中的影响很小.
- 碳酸指数在水处理 (特别是PAC) 中增加,在污泥 (特别是Fe/PMS) 中降低.
- 水热处理和Fe/PMS显著增加了以氧为中心的功能组 (C=O,C-O).
结论:
- 水热处理和脱水剂协同修改了PLA-MP的特性.
- 铁/PMS对PLA-MP降解产生重大影响,特别是在水性环境中.
- 频谱变化的序列突出显示了不同矩阵中PLA-MPs和处理化学品之间的复杂相互作用.
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