低污染多电解质层层自组装膜用于高性能染料/盐分离:自组装的序列效应
Urvashi S Joshi1,2, Soumen Samanta1, Suresh K Jewrajka1,2
1Membrane Science and Separation Technology Division, Central Salt and Marine Chemicals Research Institute (CSIR-CSMCRI), G. B. Marg, Bhavnagar, Gujarat 364002, India.
ACS applied materials & interfaces
|June 11, 2024
概括
这项研究展示了一种新方法,用于使用层次组装 (LbL) 创建高性能分子选择性膜. 开发的膜显示出出色的染料排斥和防性质,为先进的分离技术提供了洞察力.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 分离科学 分离科学
背景情况:
- 传统的逐层自组装 (LbL) 通常在负电荷基板上使用阴离子聚电解质 (PE) 作为第一层.
- 聚乙烯化物 (PVDF) 基板具有负泽塔潜力,通常用于膜应用.
研究的目的:
- 开发一种简单快速的方法来制造高性能分子选择性膜.
- 为了研究第一个沉积层的充电和组装方法对膜性能的影响.
- 探索这些膜在染料和盐分化的潜力.
主要方法:
- 阳离子PE在PVDF基板上进行非静电吸附,然后进行静电LbL组合.
- 使用度偏振 (CP-LbL) 驱动和常规 (C-LbL) 自组装来制备松散的纳米过膜.
- 在盐和染料排斥,分离因子和防腐性质方面描述膜性能.
主要成果:
- 作为第一层,用聚乙 () 硫酸 (PStSO3Na) 制备的膜表现出较高的染料排斥率 (>99.9%) 和优越的染料防性能,相比四级聚乙烯伊米达 (PVIm-Me) 的膜.
- PE沉积的序列显著影响了盐的排斥特性,PStSO3Na导致了更高的Na2SO4排斥,PVIm-Me扭转了这一趋势.
- CP-LbL组装导致了更快的自组装时间和与C-LbL膜相比的性能,这些膜需要更长的组装时间或更高的PE度.
结论:
- 该研究提供了一种新的方法,通过战略性地选择第一个沉积层和组装方法,通过LbL组装构建高性能,低污染膜.
- 形成的膜在各种压力,pH值和盐度条件下表现出极好的稳定性.
- 这项工作为设计用于选择性染料和盐分离的先进膜提供了宝贵的见解.
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