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Designing tubular composite membranes of polyelectrolyte multilayer on ceramic supports with nanofiltration and reverse osmosis transport properties
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.memsci.2020.118851 Johannes Kamp , Stephan Emonds , Matthias Wessling
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.memsci.2020.118851 Johannes Kamp , Stephan Emonds , Matthias Wessling
Abstract Ceramic membranes are relevant for applications, which require mechanical robustness and chemical stability. The preparation of purely ceramic membranes for nanofiltration (NF) and reverse osmosis (RO) is a demanding process. Composite membranes comprise a mechanically stable ceramic support and a functional polymeric separation layer, combining the advantages of both worlds. In this work, we present a molecular strategy to fabricate polyelectrolyte multilayer membranes (PEMM) ranging from dense nanofiltration into the region of reverse osmosis deposited on tubular ceramic supports. A dynamic coating of PAH/PSS on a α-Al2O3 support membrane with pore sizes of 150 nm (MF) and 50 nm (UF) leads to a dense separation layer on the lumen side, with NaCl rejections above 90%. A coating solution with increased ionic strength, as well as a subsequent covalent crosslinking of the amine groups of the PAH improve long term stability. The substitution of the polyanion PSS by PVSA, having a higher charge density, results in a remarkably low MWCO of 115 Da. This work indicates that balancing the charge density of polymers with the ionic matrix can result in reverse osmosis type selective layers on ceramic support with pore size even as large as 150 nm.
中文翻译:
设计具有纳滤和反渗透传输特性的陶瓷载体上的聚电解质多层管状复合膜
摘要 陶瓷膜与需要机械强度和化学稳定性的应用相关。用于纳滤 (NF) 和反渗透 (RO) 的纯陶瓷膜的制备是一个要求很高的过程。复合膜由机械稳定的陶瓷支撑和功能性聚合物分离层组成,结合了两者的优点。在这项工作中,我们提出了一种分子策略来制造聚电解质多层膜(PEMM),范围从密集的纳滤到沉积在管状陶瓷载体上的反渗透区域。PAH/PSS 动态涂层在孔径为 150 nm (MF) 和 50 nm (UF) 的 α-Al2O3 支撑膜上,在管腔侧形成致密的分离层,NaCl 截留率超过 90%。增加离子强度的涂层溶液,以及随后 PAH 胺基团的共价交联提高了长期稳定性。聚阴离子 PSS 被具有更高电荷密度的 PVSA 取代,导致 MWCO 非常低,为 115 Da。这项工作表明,平衡聚合物的电荷密度与离子基质可以在陶瓷载体上形成反渗透型选择性层,其孔径甚至高达 150 nm。
更新日期:2021-02-01
中文翻译:
设计具有纳滤和反渗透传输特性的陶瓷载体上的聚电解质多层管状复合膜
摘要 陶瓷膜与需要机械强度和化学稳定性的应用相关。用于纳滤 (NF) 和反渗透 (RO) 的纯陶瓷膜的制备是一个要求很高的过程。复合膜由机械稳定的陶瓷支撑和功能性聚合物分离层组成,结合了两者的优点。在这项工作中,我们提出了一种分子策略来制造聚电解质多层膜(PEMM),范围从密集的纳滤到沉积在管状陶瓷载体上的反渗透区域。PAH/PSS 动态涂层在孔径为 150 nm (MF) 和 50 nm (UF) 的 α-Al2O3 支撑膜上,在管腔侧形成致密的分离层,NaCl 截留率超过 90%。增加离子强度的涂层溶液,以及随后 PAH 胺基团的共价交联提高了长期稳定性。聚阴离子 PSS 被具有更高电荷密度的 PVSA 取代,导致 MWCO 非常低,为 115 Da。这项工作表明,平衡聚合物的电荷密度与离子基质可以在陶瓷载体上形成反渗透型选择性层,其孔径甚至高达 150 nm。