聚电解质纳米过膜用于基体分离和回收
Joshua L Livingston1, Abigail Cafferty2, Riley Miller1
1Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN 37205, USA.
Water research
|January 23, 2025
概括
新的多电解质纳米过膜在恶劣的性条件下提供了卓越的稳定性. 这些膜有效地将碳酸盐和酸盐从富含氧化物的流中分离出来,促进了资源回收应用.
科学领域:
- 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.
- 环境科学 环境科学
背景情况:
- 纳米过 (NF) 膜对于资源回收至关重要,特别是在分离单价/双价离子时.
- 传统的聚胺NF膜在极端的性条件下缺乏稳定性,阻碍了诸如分离等应用.
- 基分离对于从富含氧化物流中提取多价离子 (碳酸盐,酸盐) 至关重要.
研究的目的:
- 开发和评估抗的多电解质膜,以有效分离氧化物/碳酸盐和氧化物/酸盐.
- 评估这些新型膜在长时间暴露在高度性条件下的稳定性.
- 将性能和稳定性与商业聚胺NF膜进行比较.
主要方法:
- 在聚硫基底上使用交替的聚二甲基化 (PDADMAC) 和聚四硫酸 (PSS) 层制造聚电解质膜.
- 在不同的pH值和度下测试膜性能,以测试氧化物/碳酸盐和氧化物/酸盐分离.
- 在pH 13的KOH溶液中进行长期稳定性测试.
主要成果:
- 较高的料溶液pH值通过促进离子脱质和静电排斥来增强碳酸盐和酸盐的排斥.
- 碳酸盐和酸盐度的增加减少了由于电荷选而导致的排斥.
- 一个六层PDADMAC/PSS膜在pH13.0下实现了99%以上的碳酸盐和酸盐的去除,在pH13.0下显著的氧化物通道.
- 在pH 13 KOH下,PDADMAC/PSS膜在4周内保持出色的离子选择性,与在一周内降解的商业聚胺膜不同.
结论:
- 在高度性环境中,PDADMAC/PSS多电解质膜表现出异常的稳定性和选择性.
- 这些膜为关键资源回收应用涉及基层分离提供了持久有效的解决方案.
- 这些发现为在具有挑战性的工业条件下先进的分离技术铺平了道路.
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