Journal of Membrane Science最新文献_第3页

Hemoglobin-inspired PorMOFs synergizing with magnetic enrichment for efficient O2/N2 separation membranes 血红蛋白激发的PorMOFs与磁富集协同作用用于高效的O2/N2分离膜

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-21 DOI: 10.1016/j.memsci.2026.125196

Xiaochang Cao , Rongqing Feng , Fang Cheng , Jianming Liu , Zhi Wang

Oxygen/nitrogen (O₂/N₂) separation technology is crucial in industrial and environmental fields, yet traditional membrane materials struggle to overcome selectivity limitations because of the similar kinetic diameters and polarities of O₂ and N₂. Inspired by the reversible metalloporphyrin–O₂ coordination mechanism in hemoglobin, in this study, a porphyrin-based metal–organic framework (PorMOF) embedding high-density biomimetic sites was designed and synthesized, which was then coated onto magnetic CoFe₂O₄ particles to form a core–shell collaborative structure. The magnetic core attracts paramagnetic O₂ to aggregate within the biomimetic shell for dynamic transport. Thereon, the ordered biomimetic sites driven by the magnetic field construct efficient channels in PIM-1 membranes that prioritize oxygen permeation, structurally enhancing separation performance. A systematic investigation was conducted on (i) the mechanisms of site interactions in different biomimetic structures, (ii) the collaboration between magnetic enrichment and biomimetic effects, and (iii) the influence of loading on O₂/N₂ separation performance. Under a magnetic field of 80 mT, the 20 wt% dual-site CoFe₂O₄@PorMOF/PIM membrane achieved an O₂ permeability coefficient of 975 Barrer and an O₂/N₂ separation factor of 8.13, significantly exceeding the 2015 upper limit. During 240 h of testing, the membrane maintained stable performance and demonstrated robustness under magnetic field fluctuations. This work provides a magnetic-biomimetic synergistic strategy that offers a bioinspired avenue for functional membrane design.

氧/氮（O2/N2）分离技术在工业和环境领域至关重要，但由于O2和N2的动力学直径和极性相似，传统的膜材料难以克服选择性限制。受血红蛋白中金属卟啉- o2可逆配位机制的启发，本研究设计并合成了一种嵌入高密度仿生位点的卟啉基金属有机框架（PorMOF），并将其包裹在磁性CoFe2O4颗粒上，形成核-壳协同结构。磁性核吸引顺磁性氧聚集在仿生壳内进行动态运输。在此基础上，磁场驱动的有序仿生位点在PIM-1膜中构建了高效通道，优先透氧，从结构上增强了分离性能。系统研究了(i)不同仿生结构中位点相互作用的机制，（ii）磁富集与仿生效应之间的协同作用，以及（iii）负载对O2/N2分离性能的影响。在80 mT磁场条件下，20% wt%双位点CoFe2O4@PorMOF/PIM膜的O2渗透系数为975 Barrer， O2/N2分离系数为8.13，显著超过2015年的上限。在240 h的测试中，膜的性能保持稳定，在磁场波动下表现出鲁棒性。这项工作提供了一种磁性仿生协同策略，为功能性膜设计提供了生物灵感途径。

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引用次数: 0

Brick-and-cement structured polyamide membranes enabling to selectively separate boron from brackish water and real seawater permeate 砖和水泥结构的聚酰胺膜能够选择性地从微咸水和真正的海水渗透中分离硼

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-21 DOI: 10.1016/j.memsci.2026.125198

Sidi Zhu , M. Shahnawaz Khan , Kaihong Xiao , Chia-Ming Chang , Qipeng Zhao , Tai-Shung Chung , Shing Bor Chen

Boron removal from brackish water remains a challenge for potable water production due to the poor rejection of neutral boric acid by conventional reverse osmosis (RO) membranes. Here, we report a nanohybrid-incorporated polyamide membrane for efficient boron separation. The unique “brick-and-cement” configuration, formed by exfoliated layered double hydroxide (LDH) nanosheets (i.e., brick) and phytic acid-doped polyaniline (i.e., cement), endows the selective layer with enhanced hydrophilicity and additional water transport channels. Correspondingly, the newly developed membrane shows a water contact angle of 36° and a selective layer thickness on the order of 400 nm. The optimized membrane exhibited a water permeance of 2.76 LMH bar⁻¹ and achieved high rejection rates of 99.25 % for NaCl and 81.95 % for boron when tested with a feed solution containing 15 ppm boron and 2000 ppm NaCl. A long-term operation over 400 h confirmed its structural stability without loss of permeability or selectivity. Moreover, a real seawater permeate was employed as feed to enhance practical relevance. Using this feed with 1.5 ppm boron and 250 ppm NaCl, the developed membrane had a water permeance of 4.82 LMH bar⁻¹, salt rejection of 99.51 %, and boron rejection of 87.30 %. Complementary molecular dynamics (MD) simulation revealed the presence of interconnected free volumes as pathways for selective transport, thereby providing mechanistic evidence for the observed macroscopic performance. This work demonstrates a rational interfacial engineering approach to designing RO membranes with balanced permeability and selectivity. It may offer a promising strategy for tackling boron removal in desalination processes.

由于传统的反渗透（RO）膜对中性硼酸的去除率较差，从微咸水中去除硼仍然是饮用水生产的一个挑战。在这里，我们报道了一种用于高效硼分离的纳米混合聚酰胺膜。由剥离的层状双氢氧化物（LDH）纳米片（即砖）和植酸掺杂的聚苯胺（即水泥）形成的独特的“砖-水泥”结构赋予了选择性层增强的亲水性和额外的水输送通道。相应的，新膜的水接触角为36°，选择层厚度约为400 nm。在硼含量为15 ppm、NaCl含量为2000 ppm的进料溶液中，优化后的膜的渗透率为2.76 LMH bar−1，对NaCl的去除率为99.25%，对硼的去除率为81.95%。经过400多小时的长期运行，证实了其结构稳定，不损失渗透性和选择性。此外，为了提高实际相关性，还采用了真实的海水渗透率作为饲料。在添加1.5 ppm硼和250 ppm NaCl的条件下，制备的膜的渗透率为4.82 LMH bar−1，盐的去除率为99.51%，硼的去除率为87.30%。互补分子动力学（MD）模拟揭示了相互连接的自由体积作为选择性运输途径的存在，从而为观察到的宏观性能提供了机制证据。这项工作证明了一种合理的界面工程方法来设计具有平衡渗透性和选择性的反渗透膜。它可能为解决海水淡化过程中的硼去除问题提供一个有前途的策略。

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引用次数: 0

Hybrid proton exchange membranes reinforced by COF nanosheets with delocalized positive charges for electrochemical hydrogen compression 带离域正电荷COF纳米片增强的杂化质子交换膜用于电化学氢压缩

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-21 DOI: 10.1016/j.memsci.2026.125200

Minghao Zhou , Shiyi Zhu , Xu Dong , Xiao Pang , Ziwen Liu , Jiaojiao Cao , Zitian Zhou , Liufei Wei , Haocheng Sun , Yan Wang , Hong Wu , Zhongyi Jiang

Proton exchange membranes (PEMs) with high proton conductivity, excellent mechanical strength, and appropriate flexibility are crucial for electrochemical hydrogen compression (EHC) applications. Herein, two-dimensional ionic covalent organic framework (iCOF) nanosheets, TpEB, featuring phenanthridinium-based delocalized positive charges were incorporated into the sulfonated poly(ether ether ketone) (SPEEK) matrix. The unique 2D morphology of TpEB renders the positive charges fully accessible. The high accessibility facilitates efficient electrostatic interactions even at a low loading of 1 wt%, inducing sulfonate group rearrangement to form continuous hydrophilic ion clusters as proton transport pathways. Consequently, the hybrid PEMs achieved a high proton conductivity of 512.4 mS cm⁻¹ (80 °C, 100 % RH) and a tensile strength of 101.1 MPa. Furthermore, the delocalized positive charges endowed the hybrid PEMs with an exceptional elongation at break of 621 %, significantly outperforming the pristine SPEEK membrane and most hybrid PEMs with localized positive charges. The combination of high proton conductivity and robust mechanical properties resulted in excellent performance in EHC devices, with the SPEEK/TpEB-1 membrane achieving an outlet pressure of 3.0 MPa.

质子交换膜（PEMs）具有高质子导电性、优异的机械强度和适当的柔韧性，是电化学氢压缩（EHC）应用的关键。本文将二维离子共价有机框架（iCOF）纳米片（TpEB）结合到磺化聚醚醚酮（SPEEK）基质中，其具有非定域正电荷。TpEB独特的二维形态使得正电荷完全可接近。即使在1 wt%的低负载下，高可及性也有利于有效的静电相互作用，诱导磺酸基重排形成连续的亲水性离子簇作为质子运输途径。结果表明，混合PEMs的质子电导率为512.4 mS cm−1(80°C, 100% RH)，抗拉强度为101.1 MPa。此外，非定域正电荷使杂化膜具有621%的断裂伸长率，显著优于原始SPEEK膜和大多数具有定域正电荷的杂化膜。高质子导电性和强大的机械性能的结合使得EHC器件具有优异的性能，SPEEK/TpEB-1膜的出口压力达到3.0 MPa。

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引用次数: 0

A MIL@COF core-shell strategy for enhanced interfacial compatibility in mixed matrix membranes for CO2 separation 一种MIL@COF核壳策略增强混合基质膜的界面相容性，用于CO2分离

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-21 DOI: 10.1016/j.memsci.2026.125199

Yu Wang, Jialin Guo, Feng Tian, Run Li, Haoran Sun, Tianyang Zhao, Chengbo Jia, Chunfeng Song

The massive emission of carbon dioxide from industrial flue gas into the atmosphere has had a profound impact on humans, making the development of effective carbon capture technologies a global imperative. Among these, membrane-based separation is a particularly promising route due to its low energy consumption and small footprint. Mixed matrix membranes (MMMs), which combine the processibility of polymers with the superior separation properties of porous fillers, have emerged as a leading platform in this field. However, their performance is frequently hindered by a critical challenge: enhancing polymer-filler interfacial compatibility while synergistically combining the advantages of different porous materials. In this work, we rationally constructed a novel core-shell hybrid filler, MIL@COF, by encapsulating a hierarchical micro-mesoporous MIL-101(Cr) core with a mesoporous TAPB-DMTP-COF shell. These hybrid nanoparticles were then incorporated into a cross-linked polyethylene oxide (XLPEO) matrix to fabricate MMMs for CO₂ separation. The COF shell layer was demonstrated to significantly improve filler dispersion and strengthen interfacial compatibility with the polymer matrix, enabling robust membranes at higher loadings. Meanwhile, the MOF core provided high-capacity, selective gas transport channels. Consequently, the optimal XLPEO/MIL@COF-3 membrane achieved a CO₂ permeability of 270 Barrer and a high CO₂/N₂ selectivity of 52.3 at 25 °C and 0.3 MPa, a performance that approaches the 2008 Robeson upper bound and remains stable for over 480 h. This strategy of constructing MOF@COF hybrid fillers presents an effective approach to synergistically integrate distinct functionalities and mitigate interfacial defects in advanced MMMs.

工业烟气中的二氧化碳大量排放到大气中，对人类产生了深远的影响，因此开发有效的碳捕获技术势在必行。其中，膜分离是一种特别有前途的途径，因为它的低能耗和小足迹。混合基质膜（MMMs）结合了聚合物的可加工性和多孔填料的优越分离性能，已成为该领域的领先平台。然而，它们的性能经常受到一个关键挑战的阻碍：增强聚合物-填料界面相容性，同时协同结合不同多孔材料的优势。在这项工作中，我们通过将分层微介孔MIL-101（Cr）芯封装在介孔TAPB-DMTP-COF壳中，合理地构建了一种新型的核-壳杂化填料MIL@COF。然后将这些混合纳米颗粒掺入交联聚乙烯氧化物（XLPEO）基质中，以制造用于CO2分离的mm。研究表明，COF壳层可以显著改善填料的分散性，增强与聚合物基体的界面相容性，使膜在更高负载下更加坚固。同时，MOF岩心提供了高容量、选择性的气体输送通道。因此，最佳XLPEO/MIL@COF-3膜在25°C和0.3 MPa下的CO2渗透率为270 Barrer， CO2/N2选择性为52.3，性能接近2008 Robeson上限，并在480小时内保持稳定。这种构建MOF@COF混合填料的策略提供了一种有效的方法，可以协同整合不同的功能并减轻高级mm中的界面缺陷。

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引用次数: 0

Positively charged polyamide nanofiltration membrane via grafting a bis-pyridinium molecule for high-efficiency Mg2+/Li+ separation 带正电的聚酰胺纳滤膜通过接枝双吡啶分子实现Mg2+/Li+的高效分离

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-20 DOI: 10.1016/j.memsci.2026.125182

Xiaohui Yi , Shao-Lu Li , Jun Xiao , Niamat Ullah , Hongfen Zuo , Yunxia Hu , Genghao Gong

Efficient separation Mg²⁺ and Li⁺ is crucial for lithium extraction from salt-lake brines because the two cations have very similar chemical and physical properties. In this work, we synthesized a novel bis-pyridinium amino monomer, 1,1'-(ethane-1,2-diyl)bis(3-aminopyridin-1-ium) (BAPE), and grafted it onto the PEI-TMC membrane surface. By regulating the BAPE grafting concentration, both the surface charge and effective pore size were systematically modulated. The optimized BAPE-grafted membranes exhibited a strongly positive zeta potential (19.9 mV at pH 7) and a water permeance of 24.5 LMH/bar, 4.4 times that of the pristine membrane, while maintaining a high MgCl₂ rejection of ∼98.6 % using a 1000 ppm MgCl₂ feed solution. Notably, a single filtration stage reduced the Mg²⁺/Li⁺ ratio from 20 in the feed to 0.48 in the permeate, corresponding to a high selectivity (S_{Mg²⁺/Li⁺}) of 41.6 (2000 ppm, Mg²⁺/Li⁺ ratio of 20). The modified membranes also demonstrated excellent long-term stability over 72 h. These results underscore the value of rational molecular design, introducing pyridinium functionality by surface grafting, as a promising route to high-performance nanofiltration membranes for brine with high Mg²⁺/Li⁺ ratios.

Mg2+和Li+的高效分离对盐湖盐水中锂的提取至关重要，因为这两种阳离子具有非常相似的化学和物理性质。本文合成了一种新型的双吡啶氨基单体1,1′-（乙烷-1,2-二基）双（3-氨基吡啶-1-ium）（BAPE），并将其接枝到PEI-TMC膜表面。通过调节BAPE接枝浓度，系统地调节了表面电荷和有效孔径。优化后的bape接枝膜具有很强的正zeta电位（pH = 7时为19.9 mV），透水性为24.5 LMH/bar，是原始膜的4.4倍，同时在1000 ppm的MgCl2进料溶液中保持了高达98.6%的MgCl2去除率。值得注意的是，单级过滤将进料中的Mg2+/Li+比率从20降低到渗透液中的0.48，对应于高选择性（SMg2+/Li+）为41.6 （2000 ppm， Mg2+/Li+比率为20）。这些结果强调了合理的分子设计的价值，通过表面接枝引入吡啶功能，作为高Mg2+/Li+比盐水的高性能纳滤膜的有希望的途径。

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引用次数: 0

Boosting CO2 separation performance of mixed matrix membranes via supergravity-driven spatial packing engineering 超重力驱动空间填料工程提高混合基质膜CO2分离性能

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-20 DOI: 10.1016/j.memsci.2026.125176

Guang-Chang Xu , Chuang-Wei Gu , Yu-Ren Xue , Hong-Qing Liang , Hao-Cheng Yang , Chao Zhang , Chaofeng Lü , Yunmin Chen , Zhi-Kang Xu

Mixed matrix membranes (MMMs) have been reported to show promising potential in attaining excellent permeability and selectivity over conventional polymer counterparts for gas separation. However, conventional MMMs suffer from limited nanofillers present on the membrane surface as well as discrete nanofillers distributed in the membrane bulk, thus hampering the improvement of separation performance. Here, we propose a versatile supergravity-driven spatial packing engineering (SSPE) to elaborate asymmetric MMMs, enabling a significant enhancement of gas permeability and selectivity. Upon supergravity, MOF nanofillers rapidly migrate and assemble into a spatially-continuous packing state within polymer solution followed by a solvent evaporation process to form MOF-gathered layer spanning from the surface to the bulk of membrane, leading to an intensified surface CO₂ absorption further increasing the concentration gradient between membrane upstream and downstream meanwhile the construction of MOF continuous structure in MOF-gathered layer facilitating fast diffusion over conventional MMMs. With this SSPE strategy, three kinds of asymmetric MMMs including Pebax/ZIF-8, Pebax/CAU-1 and PIM-1/ZIF-8 are formulated and exhibit higher permeability and/or selectivity at a low ZIF-8 loading than that of conventional MMMs. Particularly, the SSPE-engineered Pebax-based MMMs exhibit a CO₂ permeability of 155.2 Barrer and high CO₂/N₂ selectivity of 88.0 while PIM-1-based MMMs exhibit a high CO₂ permeability of 3925.3 Barrer and CO₂/N₂ selectivity of 43.5, approaching even exceeding the 2019 Robeson bound limit. This work provides a universal and transformative platform for designing next-generation MMMs.

据报道，与传统聚合物相比，混合基质膜在气体分离方面具有良好的渗透性和选择性。然而，传统的MMMs膜表面存在有限的纳米填料，并且分散分布在膜体中，从而阻碍了分离性能的提高。在这里，我们提出了一种通用的超重力驱动空间填充工程（SSPE）来精心设计不对称mm，从而显著提高气体渗透性和选择性。在超重力作用下，MOF纳米填料在聚合物溶液中快速迁移并组装成空间连续的填充状态，随后溶剂蒸发过程形成从膜表面到主体的MOF聚集层。导致表面CO2吸收增强，进一步增加了膜上下游之间的浓度梯度，同时MOF聚集层中MOF连续结构的构建促进了MOF比传统MMMs的快速扩散。利用这种SSPE策略，配制了三种不对称MMMs，包括Pebax/ZIF-8、Pebax/CAU-1和PIM-1/ZIF-8，它们在低ZIF-8负载下比传统MMMs具有更高的渗透率和/或选择性。特别是，sspe设计的pebax基mmmm具有155.2 Barrer的CO2渗透率和88.0的CO2/N2选择性，而pim -1基mmmm具有3925.3 Barrer的CO2渗透率和43.5的CO2/N2选择性，接近甚至超过了2019年的Robeson界限。这项工作为下一代mm的设计提供了一个通用的、变革性的平台。

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引用次数: 0

Emerging next-generation adsorptive hollow fiber membrane for selective separation of ultra-trace arsenic from aquatic stream and its recovery 新一代吸附中空纤维膜选择性分离超痕量砷及其回收

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-20 DOI: 10.1016/j.memsci.2026.125181

Anil R. Gupta , Nayan Nandha , Pranay Kumar , Mrinmoy Mondal , Puyam S. Singh , Saroj Sharma

To combat arsenic contamination in water, a novel polymeric hollow fibre (HF) membrane indicated as [FeTMA@HF] was developed by incorporating an integrated iron precursor. The presence of cohesive iron within the polymer matrix of the HF membrane exhibits a prominent impact over the conventional mixed matrix membranes on its overall performance. The FeTMA@HF5 has shown absolute rejection of arsenic [As(V):100%, As(III): 98.6%] from 100 μg L⁻¹ feed arsenic in the HF module (module area: 0.02 m²), with a permeability of 48 Lm⁻²h⁻¹ bar⁻¹, at neutral pH (7.0±0.2) at 0.5 bar TMP, 30 L h⁻¹ CFR. The FeTMA@HF membranes were evaluated for their surface morphology, porosity, pore size, surface potential/charge, molecular weight cut-off, permeability, and contact angle. The domestic scale membrane module (area: 0.3 m²) was able to treat 7400 L of arsenic-contaminated groundwater (100 μg L⁻¹) at neutral pH with 0.5 bar pressure. The safety of treated water was validated by verifying the non-leaching behaviour of the HF membrane through toxicity assessments. This ensures that the water is safe to drink while also recovering arsenic at the end, allowing the filter to be reused multiple times after backwashing. This technique is unique in its ability to eradicate and retrieve arsenic in an environmentally sustainable manner.

为了对抗水中的砷污染，一种新型的聚合物中空纤维（HF）膜（如图[FeTMA@HF]所示）通过集成铁前驱体被开发出来。与传统的混合基质膜相比，高频膜聚合物基体中存在内聚铁对其整体性能有显著影响。在HF模块中（模块面积：0.02 m2），在中性pH(7.0±0.2),0.5 bar TMP， 30 L h−1 CFR下，FeTMA@HF5对100 μg L−1饲料砷的绝对截除率[As(V):100%, As(III): 98.6%]为48 Lm−2h−1 bar−1。对FeTMA@HF膜的表面形貌、孔隙度、孔径、表面电位/电荷、截分子量、渗透率和接触角进行了评价。国产规模膜组件（面积0.3 m2）在中性pH、0.5 bar压力下，可处理砷污染地下水7400 L （100 μg L−1）。通过毒性评估验证HF膜的不浸出行为，验证了处理后水的安全性。这确保了水可以安全饮用，同时也在最后回收砷，允许过滤器在反冲洗后多次重复使用。这项技术的独特之处在于它能够以环境可持续的方式根除和回收砷。

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引用次数: 0

Eco-friendly and cost-effective modification strategy for high-performance polyamide membranes: Synergistic regulation of interfacial tension reduction and diffusion inhibition 高性能聚酰胺膜的环保和经济改性策略：界面张力降低和扩散抑制的协同调节

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-20 DOI: 10.1016/j.memsci.2026.125184

Yuxuan Chen , Xiaoming Xu , Zhiwei Wang , Sunxinyi Wang , Guoyan Hua , Fuqiang Liu

The eco-friendly and cost-effective regulation of interface polymerization (IP) reaction is an effective strategy to enhance the energy efficiency of nanofiltration (NF). In this work, a novel polyamide (PA) NF membrane was prepared by introducing glycerol-doped sugarcane cellulose nanofibers as a biomass composite interlayer. The optimized interlayer could modulate the water-organic interfacial tension and regulate piperazine (PIP) diffusion, thereby enabling a more controlled IP reaction. The optimized membrane (TFC-8) featured a more homogeneous and integrity PA separation layer with the thickness of only 25 nm. Compared to the control membrane, TFC-8 exhibited a lower zeta potential, reduced pore size, a narrower pore size distribution, and a high pure water permeance of 45.78 LMH/bar. Additionally, TFC-8 achieved a high monovalent/divalent anion selectivity of 160.38 in the treatment of dyeing wastewater and showed great potential in the removal of organic micropollutants. Molecular dynamics simulations and interfacial tension confirmed that the composite interlayer greatly improved the tension at the water-organic interface, promoting a more uniform trans-interfacial mass transfer process of PIP. Overall, this work represents a novel eco-friendly modification method for the preparation of homogeneous and structurally intact PA NF membranes for efficient separation of inorganic salts from wastewater.

对界面聚合（IP）反应进行环保、经济的调控是提高纳滤（NF）能源效率的有效策略。本文通过引入甘油掺杂的甘蔗纤维素纳米纤维作为生物质复合中间层，制备了一种新型聚酰胺（PA）纳滤膜。优化后的中间层可以调节水-有机界面张力，调节哌嗪（PIP）的扩散，从而使IP反应更加可控。优化后的膜（TFC-8）具有更均匀和完整的PA分离层，厚度仅为25 nm。与对照膜相比，TFC-8具有更低的zeta电位、更小的孔径、更窄的孔径分布和45.78 LMH/bar的高纯水渗透率。此外，TFC-8在处理印染废水中具有较高的一价/二价阴离子选择性（160.38），在去除有机微污染物方面具有很大的潜力。分子动力学模拟和界面张力证实，复合中间层大大提高了水-有机界面张力，促进了PIP跨界面传质过程更加均匀。总的来说，这项工作代表了一种新的环保改性方法，用于制备均匀且结构完整的PA - NF膜，以有效分离废水中的无机盐。

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引用次数: 0

Two-bilayer polyelectrolyte multilayered nanofiltration membranes for highly efficient removal of PFAS from water 高效去除水中PFAS的双层聚电解质多层纳滤膜

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-19 DOI: 10.1016/j.memsci.2026.125180

Ahmed M.A. Abdelsamad , Ibrahim M.A. Elsherbiny , Mathias Kühnert , Marco Went , Anett Georgi , Stefan Panglisch , Agnes Schulze , Katrin Mackenzie

Per- and polyfluoroalkyl substances (PFAS) are a major threat to human health and the environment due to their persistence and harmfulness. One of the most efficient and sustainable approaches for their separation from water is membrane technology. In this study, polyelectrolyte multilayered (PEM) nanofiltration membranes were developed through layer-by-layer assembly of poly(diallyldimethylammonium chloride)/poly(styrenesulfonate) (PDADMAC/PSS) on polyethersulfone (PES) ultrafiltration supports to remove two representative PFAS, perfluorooctanoic acid (PFOA) and perfluorohexanoic acid (PFHxA). The effects of bilayer number and electron beam (EB) surface modification of the PES support were systematically investigated. A membrane coated with two bilayers achieved a PFOA rejection of (90.0 ± 3.6)% with a pure water permeability of (19.6 ± 3.1) L m⁻² h⁻¹ bar⁻¹ on unmodified PES, which improved to (94.5 ± 3.2)% and (25 ± 4) L m⁻² h⁻¹ bar⁻¹ after EB modification. Increasing the coating to three bilayers further enhanced PFOA rejection to (99 ± 0.4)% with permeability of (16 ± 4.3) L m⁻² h⁻¹ bar⁻¹, surpassing the commercial NF270 membrane with (94.6 ± 2.1)% and (15.7 ± 2.5) L m⁻² h⁻¹ bar⁻¹). PFHxA rejection was slightly lower due to its smaller molecular size and lower hydrophobicity. The membranes maintained stable rejection across pH values, while salts, particularly MgSO₄ with higher ionic strength, reduced rejection through charge screening and bilayer swelling, which also increased permeability. Overall, PEM membranes, especially those on EB-modified supports, provide a good balance between flux and selectivity and have great potential as scalable, energy-efficient methods of removing PFAS from water.

全氟烷基和多氟烷基物质因其持久性和危害性而对人类健康和环境构成重大威胁。膜技术是将它们从水中分离的最有效和可持续的方法之一。本研究通过在聚醚砜（PES）超滤支架上对聚二烯基二甲基氯化铵（diallyldimethyllam氯化铵）/聚苯乙烯磺酸（PDADMAC/PSS）进行层层组装，制备聚电解质多层（PEM）纳滤膜，以去除两种典型的PFAS：全氟辛酸（PFOA）和全氟己酸（PFHxA）。系统研究了双层数和电子束表面改性对聚醚砜载体性能的影响。在未改性的PES上涂覆两层双层膜的PFOA去除率为（90.0±3.6）%，纯水渗透率为（19.6±3.1）L m−2 h−1 bar−1，经EB改性后的膜的PFOA去除率为（94.5±3.2）%，纯水渗透率为（25±4）L m−2 h−1 bar−1。将涂层增加到三层，PFOA截留率为（99±0.4）%，渗透率为（16±4.3）L m−2 h−1 bar−1，超过了商用NF270膜的（94.6±2.1）%和（15.7±2.5）L m−2 h−1 bar−1。PFHxA由于其分子尺寸较小，疏水性较低，排斥率略低。膜在不同的pH值下保持稳定的排斥性，而盐，特别是离子强度较高的MgSO4，通过电荷筛选和双层膨胀来减少排斥性，这也增加了渗透性。总的来说，PEM膜，特别是那些在eb修饰的支架上的膜，在通量和选择性之间提供了很好的平衡，并且作为可扩展的、节能的从水中去除PFAS的方法具有很大的潜力。

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引用次数: 0

Catalyst-enhanced semi-interpenetrating polyurea networks for alkaline-resistant reverse osmosis membranes 用于耐碱性反渗透膜的催化剂增强半互穿聚脲网络

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-19 DOI: 10.1016/j.memsci.2026.125150

Yue Sun , Yu Zhao , Xiaoxia Sun , Qingshan Liu , Jia Xu

Polyurea (PU) materials show great potential for pH-stable reverse osmosis (RO) membranes essential in sustainable water treatment. However, PU membranes derived from 2,4-toluene diisocyanate (TDI) suffer from intrinsic alkaline resistance limitations due to steric hindrance from 1-position methyl groups, which reduce reaction kinetics and cross-linking density. Here, we introduce a triethylamine (TEA)-mediated strategy to accelerate TDI hydrolysis and form semi-interpenetrating networks (semi-IPN), integrating reticulated aliphatic and linear aromatic polyurea chains into a robust selective layer. The resulting membranes achieve outstanding desalination performance, with NaCl and MgCl₂ rejections exceeding 98 % at water permeance over 1.3 L m⁻² h⁻¹ bar⁻¹, ∼38 % improvement in NaCl rejection over conventional PU membranes. Notably, after 216 h in 0.1 M NaOH, the membranes maintain NaCl and MgCl₂ rejections above 92 % with only ∼5 % reduction, outperforming TEA-free PU and commercial polyamide membranes, which lose ∼9 % and ∼12 % rejection, respectively. Dynamic anti-alkali tests confirm sustained performance above 95 % in highly alkaline environments. Mechanistic investigations attribute the enhanced alkaline resistance to tortuous diffusion pathways, increased cross-linking density, and enriched double hydrogen bonds, reducing swelling and improving hydrolytic stability. This work highlights semi-IPN PU membranes as a durable solution for extending desalination and wastewater treatment to highly alkaline industrial effluents.

聚脲（PU）材料在ph稳定反渗透（RO）膜的可持续水处理中显示出巨大的潜力。然而，由2,4-甲苯二异氰酸酯（TDI）衍生的PU膜由于1位甲基的位阻而受到固有的耐碱性限制，从而降低了反应动力学和交联密度。在这里，我们引入了一种三乙胺（TEA）介导的策略来加速TDI水解并形成半互穿网络（半ipn），将网状脂肪族和线性芳香聚脲链整合到一个强大的选择层中。所得膜具有出色的脱盐性能，在渗透率超过1.3 L m−2 h−1 bar−1时，NaCl和MgCl2的去除率超过98%，比传统PU膜的NaCl去除率提高约38%。值得注意的是，在0.1 M NaOH中浸泡216小时后，膜的NaCl和MgCl2截留率保持在92%以上，仅下降了~ 5%，优于不含tea的PU膜和商用聚酰胺膜，后者的截留率分别下降了~ 9%和~ 12%。动态抗碱测试证实，在高碱性环境下，性能持续保持在95%以上。机理研究将增强的抗碱性归因于弯曲的扩散途径、增加的交联密度和丰富的双氢键，减少膨胀和提高水解稳定性。这项工作突出了半ipn PU膜作为一种持久的解决方案，扩展海水淡化和废水处理到高碱性工业废水。

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引用次数: 0