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Ultrastable Nanofiltration Membranes Engineered by Polydopamine-Assisted Polyelectrolyte Layer-by-Layer Assembly for Water Reclamation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-01 , DOI: 10.1021/acssuschemeng.0c03318 Fangang Meng 1, 2 , Fei Song 1, 2 , Yaxuan Yao 3 , Guimei Liu 1, 2 , Shanshan Zhao 1, 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-01 , DOI: 10.1021/acssuschemeng.0c03318 Fangang Meng 1, 2 , Fei Song 1, 2 , Yaxuan Yao 3 , Guimei Liu 1, 2 , Shanshan Zhao 1, 2
Affiliation
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The layer-by-layer (LBL) electrostatic assembly is an effective method for fabricating high-performance nanofiltration (NF) membranes. However, the structural integrity of the separation layers can be compromised in strong acid and alkaline conditions, which limits their applications in water reclamation. Herein, we presented novel ultrastable LBL-based NF membranes engineered by mussel-inspired “bio-glue” polydopamine (PDA)-assisted polyelectrolyte LBL deposition (PDA-a-LBL) technique. Through alternative deposition of PDA/polyethylenimine (PEI) and poly(sodium 4-styrenesulfonate) (PSS) layers onto polyethersulfone (PES) ultrafiltration substrates, tailorable pore size and tunable surface chemistry were achieved. The hydrophilicity and surface charge properties of the NF membranes were dependent on the functionality of the outermost layer. The novel PDA-a-LBL NF membranes presented molecular weight cut-off (MWCO) of 275–430 Da and more than 94% rejections against divalent anions along with pure water permeability of 7–13 L m–2 h–1 bar–1, which were competitive with the currently reported LBL-based NF membranes and commercial FilmTec NF-270 membrane. Significantly, the newly developed NF membrane (PES-50-3L) exhibited remarkable chemical stability in the pH range of 2–11, ascribing to the synergistic effects of covalent bonds, electrostatic interaction, and π–π stacking between PDA/PEI and PSS layers. In addition, the membrane exhibited robust performance in a continuous, 1 week long-term operation, demonstrating its great potential for sustainable water reclamation. Our findings may shed light on the future design of novel LBL-based NF membranes with enhanced chemical stability.
中文翻译：
由聚多巴胺辅助的聚电解质层层叠组装设计的超稳定纳滤膜，用于水的再生
逐层（LBL）静电组件是一种用于制造高性能纳滤（NF）膜的有效方法。但是，在强酸和强碱条件下，分离层的结构完整性可能会受到损害，这限制了它们在水回收中的应用。在这里，我们介绍了由贻贝启发的“生物胶”聚多巴胺（PDA）辅助聚电解质LBL沉积（PDA-a-LBL）技术设计的新型超稳定的基于LBL的NF膜。通过将PDA /聚乙烯亚胺（PEI）和聚（4-苯乙烯磺酸钠）（PSS）层交替沉积到聚醚砜（PES）超滤基质上，可以实现可定制的孔径和可调节的表面化学性质。NF膜的亲水性和表面电荷性质取决于最外层的功能。–2 h –1 bar –1，与目前报道的基于LBL的NF膜和商业性FilmTec NF-270膜相比具有竞争力。值得注意的是，新开发的NF膜（PES-50-3L）在2-11的pH范围内表现出显着的化学稳定性，归因于PDA / PEI和PSS之间的共价键，静电相互作用以及π-π堆积的协同效应。层。此外，该膜在连续的1周长期运行中表现出强大的性能，证明了其在可持续水再生方面的巨大潜力。我们的发现可能为化学稳定性增强的新型基于LBL的NF膜的未来设计提供启示。
更新日期：2020-07-27
中文翻译：
由聚多巴胺辅助的聚电解质层层叠组装设计的超稳定纳滤膜，用于水的再生
逐层（LBL）静电组件是一种用于制造高性能纳滤（NF）膜的有效方法。但是，在强酸和强碱条件下，分离层的结构完整性可能会受到损害，这限制了它们在水回收中的应用。在这里，我们介绍了由贻贝启发的“生物胶”聚多巴胺（PDA）辅助聚电解质LBL沉积（PDA-a-LBL）技术设计的新型超稳定的基于LBL的NF膜。通过将PDA /聚乙烯亚胺（PEI）和聚（4-苯乙烯磺酸钠）（PSS）层交替沉积到聚醚砜（PES）超滤基质上，可以实现可定制的孔径和可调节的表面化学性质。NF膜的亲水性和表面电荷性质取决于最外层的功能。–2 h –1 bar –1，与目前报道的基于LBL的NF膜和商业性FilmTec NF-270膜相比具有竞争力。值得注意的是，新开发的NF膜（PES-50-3L）在2-11的pH范围内表现出显着的化学稳定性，归因于PDA / PEI和PSS之间的共价键，静电相互作用以及π-π堆积的协同效应。层。此外，该膜在连续的1周长期运行中表现出强大的性能，证明了其在可持续水再生方面的巨大潜力。我们的发现可能为化学稳定性增强的新型基于LBL的NF膜的未来设计提供启示。
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