不同的PFAS化合物的扩散和分离通过热塑性聚氨和三个不同的PVC-EIA内
R K Rowe1, F B Barakat1, D Patch2
1GeoEngineering Centre at Queen's - RMC, Queen's University, Kingston K7L 3N6, Canada.
The Science of the total environment
|May 28, 2023
概括
热塑性聚氨 (TPU) 内显示出显著的和多基物质 (PFAS) 扩散,特别是在更高的温度下. 乙烯交聚合物合金 (PVC-EIA) 层提供了极好的耐力,性能因乙烯 (KEE) 含量和温度而异.
科学领域:
- 环境科学与工程环境科学与工程
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 和多基基物质 (PFAS) 是持久的环境污染物.
- 聚合物内用于各种应用,可能与PFAS相互作用.
- 了解PFAS通过层材料的扩散和吸附对于环境风险评估至关重要.
研究的目的:
- 通过热塑性聚氨 (TPU) 和三个PVC-EIA内评估五种常见PFAS (PFOA,PFOS,PFBS,6:2 FTS,GenX) 的扩散和吸收.
- 评估温度 (23°C,35°C,50°C) 和内成分 (不同的KEE含量) 对PFAS运输的影响.
- 为了提供透系数,并与LLDPE和LLDPE-EVOH地质膜比较层性能.
主要方法:
- 使用TPU和三种PVC-EIA层 (EIA1,EIA2,EIA3) 进行了扩散试验,其乙烯 (KEE) 含量各不相同.
- 进行了吸附试验,以确定材料分区.
- 在三种不同的温度 (23°C,35°C,50°C) 进行了测试,测试时间长 (长达1331天).
主要成果:
- 在TPU内中,显著的PFAS扩散,特别是PFOA和PFOS,在更高的温度下增长率.
- PVC-EIA内表现出极好的扩散性,特别是在23°C.
- 在高温下,含有KEE含量最低的PVC-EIA内 (EIA3) 显示出最好的扩散电阻,其次是EIA1和EIA2. 没有观察到可测量的吸附任何物质的任何物质.
结论:
- 由于其高扩散阻力,PVC-EIA内在含有PFAS方面优于TPU.
- 线路 KEE 含量和温度显著影响 PFAS 扩散率.
- 透系数和Pg值为选择适当的封装材料和管理PFAS风险提供了有价值的数据.
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