微塑料老化对Ni的吸附和脱附行为的影响 (II) 在各种老化条件下
Anqi Xie1, Su Chen2, Xiao Liang1
1Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, College of the Environment, Shenyang University, Shenyang, China.
Environmental geochemistry and health
|February 22, 2025
概括
老化过程增强了微塑料 (塑料颗粒<5mm) 吸附和释放的能力. 处理最显著地增加了聚乳酸 (PLA) 和聚烯 (PS) 微塑料上的吸附.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
背景情况:
- 微塑料 (MP) 是普遍存在的环境污染物.
- 国会议员可以吸收和运输重金属,造成生态风险.
- 了解MP老化对金属吸附的影响对于环境风险评估至关重要.
研究的目的:
- 在聚钢 (PS) 和聚乳酸 (PLA) 微塑料上研究 (Ni) 的吸附和脱附.
- 为了评估冷解,干湿和老化的对Ni吸收的影响.
- 为了确定老化对MP表面特性和金属结合的影响.
主要方法:
- 微塑料通过冷解,干湿循环和处理进行老化.
- 老年MP的特征:表面积,毛孔大小,结晶度,功能组.
- 对于Ni的批量吸附/脱附实验,对未老化和老化的MP进行.
- 动力和同热模拟 (例如,伪二次,兰木尔).
主要成果:
- 衰老增加了MP表面积,毛孔大小和含氧的功能组.
- 吸附动力学遵循伪二阶模型;异热体适合兰格穆尔模型.
- 年长的国会议员表现出比未年长的国会议员更高的Ni吸附能力.
- 吸附能力顺序:老化 > 交替干湿 > 结冰解.
- 而PLA的吸度比PS的吸度更高.
- 性老化产生了最高的Ni脱吸率.
结论:
- 微塑料的老化显著改变了表面特性,提高了重金属吸附能力.
- 衰老引起的变化影响吸附行为和脱吸动力学.
- 聚乳酸 (PLA) 是一个更有效的吸收剂比聚烯 (PS) 在老化后.
- 研究结果强调了重金属运输中老化微塑料对环境的影响.
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