Metal ion coordination encapsulation mediated sequential interfacial polymerization for tunable polyamide-polyurea acid-resistant nanofiltration membranes

IF 9.9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Desalination Pub Date : 2027-01-15 Epub Date: 2026-10-01 DOI:10.1016/j.desal.2026.120885

Xue-Li Cao, Xiao-Yun Yi, Zai-Xu Nan, Hao Li, Zhenglei Wu, Pengfei Xia, Shi-Peng Sun, Weihong Xing

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引用次数: 0

Abstract

To overcome the trade-off between acid stability and permeability of acid-resistant nanofiltration membranes, this study developed a metal ion coordination encapsulation mediated sequential interfacial polymerization (MICE-SIP) strategy to fabricate polyamide-polyurea (PAPU) hybrid acid-resistant membranes. By leveraging the reversible Cu²⁺ coordination with polyethyleneimine and its acid-triggered in situ release, a hierarchical “loose PA layer & embedded PU layer” architecture was constructed. Within this structure, the intertwinement of PU and PA chains enable preferential H⁺ transport via PU hydrogen-bonding pathways in acidic media, shielding the amide bonds from direct attack and establishing a protective mechanism for the PA matrix. Cu²⁺ concentration modulation endows broad-spectrum tunability in membrane performance: permeability of 2–8 L·m⁻²·h⁻¹·bar⁻¹, MgSO₄ rejection of 30%–95%, and acid resistance in 5–20 wt% H₂SO₄. At 0.1 wt% Cu²⁺, the PAPU membrane achieves excellent permselectivity (permeability: 2.41 L·m⁻²·h⁻¹·bar⁻¹; MgSO₄ rejection: 95.64%), and no degradation after 31 days in 20 wt% H₂SO₄. In simulated etching foil wastewater, it delivers 96% Al³⁺ rejection and 94% acid permeation. Crucially, its processing flux was 3.8-fold higher than that of a commercial AMS membrane, corresponding to a proportional enhancement in acid recovery efficiency. This work provides a new paradigm for precise molecular engineering of acid-resistant nanofiltration membranes and demonstrates their promise for strong acid waste valorization.

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金属离子配位包封介导的可调聚酰胺-聚脲耐酸纳滤膜的顺序界面聚合

为了克服耐酸纳滤膜的耐酸稳定性和渗透性之间的权衡，本研究开发了一种金属离子配位包封介导的顺序界面聚合（micessip）策略来制备聚酰胺-聚脲（PAPU）杂化耐酸膜。通过利用Cu2+与聚乙烯亚胺的可逆配位及其酸触发的原位释放，构建了分层的“松散PA层&嵌入PU层”结构。在这种结构中，PU和PA链的相互缠绕使H+在酸性介质中通过PU氢键途径优先运输，屏蔽酰胺键免受直接攻击，并建立了PA基质的保护机制。Cu2+浓度调制赋予了膜性能的广谱可调性：渗透率为2 - 8 L·m−2·h−1·bar−1，MgSO4去除率为30%-95%，耐5-20 wt% H2SO4酸性。在0.1 wt% Cu2+条件下，PAPU膜具有优异的过电选择性（渗透率：2.41 L·m−2·h−1·bar−1；MgSO4去除率：95.64%），在20 wt% H2SO4条件下31天后无降解。在模拟蚀刻箔废水中，它具有96%的Al3+截留率和94%的酸渗透率。关键是，其处理通量比商用AMS膜高3.8倍，相当于酸回收效率的比例提高。这项工作为耐酸纳滤膜的精确分子工程提供了一个新的范例，并展示了它们在强酸废物增值方面的前景。

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来源期刊

Desalination 工程技术-工程：化工

CiteScore

14.60

自引率

20.20%

发文量

619

审稿时长

41 days

期刊介绍： Desalination is a scholarly journal that focuses on the field of desalination materials, processes, and associated technologies. It encompasses a wide range of disciplines and aims to publish exceptional papers in this area. The journal invites submissions that explicitly revolve around water desalting and its applications to various sources such as seawater, groundwater, and wastewater. It particularly encourages research on diverse desalination methods including thermal, membrane, sorption, and hybrid processes. By providing a platform for innovative studies, Desalination aims to advance the understanding and development of desalination technologies, promoting sustainable solutions for water scarcity challenges.