Journal of Membrane Science最新文献_第4页

Tuning phase inversion kinetics and membrane structure via sulfonation degree in PES/SPSf blending system for high-performance loose nanofiltration 通过磺化程度调整PES/SPSf共混体系的相变动力学和膜结构，用于高性能松散纳滤

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.2026.125177

Zuhui Qin , Bangrun He , Xiaoting Pan , Zhong Zhang , Lei Zhang , Xianhui Li

Achieving high permeability and selectivity in polyethersulfone (PES) membranes remains a challenge. Blending with functional polymers like sulfonated polysulfone (SPSf) provides a viable strategy to enhance overall membrane performance. This study focuses on the PES/SPSf blending system, specifically investigating the regulatory mechanism of the degrees of sulfonation (DS) of SPSf on the membrane structure and separation performance. A higher DS reduces thermodynamic stability but promotes strong hydrogen-bonding gelation. The resultant gelation initially delays phase separation by limiting the mobility of polymer chains. As hydration proceeds, this interaction facilitates the reorganization into hydrated micelles, and their eventual packing establishes open mass-transfer pathways. This kinetic transformation drives the evolution of the membrane morphology from a finger-like structure to a dense sponge-like structure, significantly increasing both the mean pore size and the thickness of the selective layer. By increasing the DS from 10 % to 30 %, a highly permeable loose nanofiltration membrane was successfully prepared, exhibiting a more than fourfold increase in water permeability while preserving nearly complete rejection (>98 %) for Congo red dye and slight rejection for NaCl. This work elucidates the mechanism by which the DS governs membrane performance, demonstrating its pivotal role in tuning microstructure and separation properties.

在聚醚砜（PES）膜中实现高渗透性和选择性仍然是一个挑战。与功能性聚合物如磺化聚砜（SPSf）共混提供了一种提高整体膜性能的可行策略。本研究以PES/SPSf共混体系为研究对象，研究了SPSf磺化度（DS）对膜结构和分离性能的调控机制。较高的DS降低了热力学稳定性，但促进了强氢键凝胶化。由此产生的凝胶化最初通过限制聚合物链的流动性来延迟相分离。随着水合作用的进行，这种相互作用促进了水合胶束的重组，并最终形成了开放的传质途径。这种动力学转变驱动膜形态从指状结构演变为致密的海绵状结构，显著增加了平均孔径和选择层的厚度。通过将DS从10%提高到30%，成功制备了高渗透性的松散纳滤膜，其透水性增加了四倍以上，同时保持了对刚果红染料的几乎完全截留（> 98%）和对NaCl的轻微截留。这项工作阐明了DS控制膜性能的机制，证明了它在调节微观结构和分离性能方面的关键作用。

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引用次数: 0

Ultrahigh CO2/O2 transport selectivity of triblock zwitterionic hydrogel oxygenation membranes 三嵌段两性离子水凝胶氧化膜的超高CO2/O2传输选择性

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.2026.125175

Yuhang Guo , Fusheng Pan , Jing Huang , Shiyao Yu , Yuhan Wang , Honghao Su , Ke Chen , Zhongyi Jiang

Efficient removal of carbon dioxide (CO₂) while ensuring adequate oxygen (O₂) delivery remains the fundamental challenge for artificial oxygenation membranes. The limited transmembrane CO₂ driving force presents a fundamental bottleneck in extracorporeal membrane oxygenation (ECMO), drastically curbing its removal efficiency and necessitating membranes with high CO₂/O₂ selectivity. Herein, we develop triblock zwitterionic hydrogel membranes that achieve an ultrahigh CO₂/O₂ transport selectivity of ∼44 and an exceptional CO₂ exchange rate of ∼860 mL min⁻¹ m⁻² under physiological blood-gas exchange conditions. The membrane architecture integrates CO₂-reactive electrolyte domains with optimized water channels, forming dynamic CO₂/

HC O_{3}^{-}

conversion pathways that selectively facilitate CO₂ transport while maintaining O₂ transport and meanwhile effectively decoupling CO₂ and O₂ transport mechanisms, leading to selective enhancement of CO₂ transport without compromising overall gas exchange efficiency. Benefiting from the densely hydrated network and robust interfacial anchoring, the hydrogel membranes also demonstrate excellent anti-plasma leakage durability and long-term hemocompatibility. This work opens an alternative avenue to designing oxygenation membranes with the high CO₂/O₂ transport selectivity and gas exchange rate.

有效去除二氧化碳（CO2）的同时确保足够的氧气（O2）的输送仍然是人工氧合膜的基本挑战。有限的跨膜CO2驱动力是体外膜氧化（extracorporeal membrane oxygenation， ECMO）的根本瓶颈，严重制约了其去除效率，需要具有高CO2/O2选择性的膜。在此，我们开发了三阻断两性离子水凝胶膜，该膜在生理血气交换条件下实现了超高的CO2/O2转运选择性~ 44和异常的CO2交换速率~ 860 mL min - 1 m−2。膜结构将CO2-活性电解质域与优化的水通道集成在一起，形成了动态的CO2/ HCO3−转化途径，选择性地促进CO2运输，同时保持O2运输，同时有效地解耦CO2和O2运输机制，从而在不影响整体气体交换效率的情况下选择性地增强CO2运输。得益于密集的水合网络和强大的界面锚定，水凝胶膜还具有出色的抗血浆泄漏耐久性和长期血液相容性。这项工作为设计具有高CO2/O2传输选择性和气体交换速率的氧化膜开辟了另一种途径。

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引用次数: 0

Overcoming cross–scale manufacturing barriers toward scalable nanoporous atomically thin membranes for gas–liquid separation 克服用于气液分离的可伸缩纳米多孔原子薄膜的跨尺度制造障碍

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-18 DOI: 10.1016/j.memsci.2026.125170

Dawei Lu , Shanshan Wang , Ying Zhang , Ye Liu , Jinze Zheng , Siyu Hu , Junhe Tong , Dongxu Zhang , Dandan Hou , Luda Wang

Nanoporous atomically thin membranes (NATMs) have considerable promise for molecular separations. However, their application has been hindered by several cross–scale manufacturing challenges, including non–selective leakage caused by large defects, mechanical damage during operation, and limited long–term operational stability. Graphene, as a representative NATM, offers tunable nanopores and outstanding molecular sieving, but these advantages remain unrealized without overcoming cross-scale barriers. Here, we propose a flow–resistance–matching strategy that integrates multiple structure levels to balance permeance, selectivity, and stability. It combines a porous PVDF support layer fabricated via phase separation for mechanical support, double–layer nanoporous graphene for molecular sieving, and an ultrathin PDMS (∼1.94 μm) coating to prevent non–selective leakage and protect graphene. This approach also enables scalable fabrication with areas up to 300 cm². The as-prepared membranes showed outstanding gas–liquid separation performance in precision total organic carbon (TOC) analyzers, with a coefficient of determination R² = 0.999. They also exhibited stable performance with an RSD of 0.78 % over 7 days and 2.31 % over 576 h (24 days), respectively whereas samples lacking cross-scale engineering typically failed within a few days. These results establish a scalable way for application of NATMs in industrial gas–liquid separation.

纳米多孔原子薄膜（NATMs）在分子分离方面具有广阔的应用前景。然而，它们的应用受到几个跨尺度制造挑战的阻碍，包括大缺陷引起的非选择性泄漏、操作过程中的机械损伤以及有限的长期运行稳定性。石墨烯作为新纳米材料的代表，具有可调的纳米孔和出色的分子筛分能力，但如果不克服跨尺度障碍，这些优势仍无法实现。在这里，我们提出了一种流动阻力匹配策略，该策略集成了多个结构水平，以平衡渗透，选择性和稳定性。它结合了通过相分离制备的多孔PVDF支撑层作为机械支撑，双层纳米多孔石墨烯用于分子筛分，超薄PDMS （~ 1.94 μm）涂层用于防止非选择性泄漏并保护石墨烯。这种方法还可以实现面积达300平方厘米的可扩展制造。制备的膜在精密总有机碳（TOC）分析仪中具有良好的气液分离性能，测定系数R2 = 0.999。它们也表现出稳定的性能，在7天内的RSD为0.78%，在576小时（24天）内的RSD为2.31%，而缺乏跨尺度工程的样品通常在几天内失效。这些结果为natm在工业气液分离中的应用开辟了一条可扩展的途径。

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引用次数: 0

Charge-enhanced polyamide nanofiltration membranes via carboxyl doping for Li+-Mg2+ separation 羧基掺杂电荷增强聚酰胺纳滤膜分离Li+-Mg2+

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-18 DOI: 10.1016/j.memsci.2026.125174

Yihao Song , Qieyuan Gao , Junwei Li , Yuepeng Li , Yulong Cheng , Daliang Xu , Mian Wu , Zhao Wei , Xiaoqi Sun , Yaowen Xing , Bart Van der Bruggen , Zirui Lin , Xiahui Gui

Polyamide (PA) membranes are promising nanofiltration (NF) materials for Li⁺-Mg²⁺ separation in lithium extraction from salt-lake brines. However, their limited water permeance and reliance on acidic environments to maintain protonated electropositive surfaces hinder overall performances. Herein, we introduced a carboxyl doped PA NF membrane, hereafter referred to as GLY/PA-PDA (GLY = glycine; PDA = polydopamine). The hydrophilic ultrathin rough GLY/PA rejection layer and PDA interlayer enabled an exceptional water permeance of 17.2 L m⁻² h⁻¹ bar⁻¹. More importantly, carboxyl groups acted as unique Mg²⁺ catchers to functionalize surfaces, resulting in enhanced surface positive charge intensity and sustained ion selectivity. The GLY/PA-PDA membranes achieved an impressive Li⁺-Mg²⁺ separation coefficient of 30.5 in mixed-cation feeds. During a 3-stage separation process, the membrane demonstrated continuously increasing separation coefficients of each stage, obtaining an ultra-low-Mg²⁺ extraction solution of 0.06 ppm. Our work proposes a direction for improving selectivity by utilizing guest metal cations within NF systems.

聚酰胺（PA）膜是一种很有前途的纳滤材料，可用于盐湖盐水锂提取中Li+-Mg2+的分离。然而，它们有限的透水性和依赖于酸性环境来维持质子化的正电表面阻碍了整体性能。本文介绍了一种羧基掺杂的PA NF膜，以下简称GLY/PA-PDA （GLY =甘氨酸；PDA =聚多巴胺）。亲水性超薄粗糙的GLY/PA截留层和PDA中间层使透水性达到17.2 L m−2 h−1 bar−1。更重要的是，羧基作为独特的Mg2+捕集剂使表面功能化，从而增强了表面正电荷强度和持续的离子选择性。GLY/PA-PDA膜在混合阳离子进料中获得了令人印象深刻的Li+-Mg2+分离系数30.5。在3级分离过程中，膜的分离系数逐级递增，得到0.06 ppm的超低mg2 +萃取液。我们的工作提出了一个方向，提高选择性通过利用客金属阳离子在NF系统。

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引用次数: 0

Hollow fiber supported ionic liquid membrane contactors with enhanced stability by gel coating for selective Li+/Mg2+ separation 凝胶涂层增强稳定性的中空纤维支撑离子液体膜接触器用于Li+/Mg2+的选择性分离

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-17 DOI: 10.1016/j.memsci.2026.125158

Jiahui Du , Bo Dong , Xiaohua Ma , Qingxia Zhu , Jianxin Li

Supported ionic liquid membrane (SILM) technology offers high efficiency and continuous operability for lithium extraction from salt-lake brines, yet achieving long-term stability remains its foremost unresolved challenge. Herein, a crown ether-based polyimide (PI) hollow fiber SILM with tributyl phosphate (TBP) and sodium bis(trifluoromethanesulfonyl)imide (NaNTf₂) as organic phase was coated with a poly(acrylic acid) (PAA) gel layer to fabricate a PAA gel-SILM via thermally initiated polymerization. Then, a PAA gel-SILM contactor with an effective length of 100 mm, a diameter of 10 mm, and a packing density of 15 % was assembled to extract lithium from a simulated salt-lake brine by implementing counter-current flow. The results showed that the PAA gel-SILM contactor with a 2.0 μm gel coating exhibited a high Li⁺ mass transfer rate of 0.538 μm s⁻¹ and a Li⁺/Mg²⁺ separation factor of 28.35. Owing to the stabilizing hydrogen-bond network between the PAA coating and TBP/NaNTf₂, the contactor maintained a Li⁺/Mg²⁺ separation factor above 27.25 throughout 240 h of continuous operation. Finally, solid Li₂CO₃ was successfully precipitated from the enriched solution using saturated Na₂CO₃, confirming the feasibility of the integrated process from selective extraction to product formation. In summary, this work provides a highly stable and continuous method for lithium extraction from salt lakes.

支撑离子液体膜（SILM）技术为盐湖盐水的锂提取提供了高效率和持续的可操作性，但实现长期稳定性仍然是该技术面临的最大挑战。本文以磷酸三丁酯（TBP）和二（三氟甲磺酰）亚胺钠（NaNTf2）为有机相，在冠醚基聚酰亚胺（PI）中空纤维SILM上包覆聚丙烯酸（PAA）凝胶层，通过热引发聚合制备PAA凝胶-SILM。然后，组装一个有效长度为100 mm、直径为10 mm、填充密度为15%的PAA凝胶- silm接触器，通过逆流从模拟盐湖盐水中提取锂。结果表明，包覆2.0 μm凝胶的PAA凝胶- silm接触器具有较高的Li+传质率（0.538 μm s−1）和Li+/Mg2+分离系数（28.35）。由于PAA涂层与TBP/NaNTf2之间的氢键网络稳定，在240 h的连续运行中，接触器的Li+/Mg2+分离系数保持在27.25以上。最后，用饱和Na2CO3从富集溶液中成功析出固体Li2CO3，证实了从选择性萃取到产物生成一体化过程的可行性。本研究为盐湖提取锂提供了一种稳定、连续的方法。

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引用次数: 0

Pt modified Ni-PES membrane for simultaneous hydrogen production and separation via alkaline water electrolysis Pt改性Ni-PES膜在碱水电解同时制氢和分离中的应用

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-17 DOI: 10.1016/j.memsci.2026.125169

Ruina Zhang , Yugang Zhou , Tao Zhang, Yu Gao, Xunbin Yang, Yanshuo Li, Wei Fang

Alkaline water electrolysis (ALK) faces technological challenges including low electrolysis efficiency, high energy consumption, and limitation of membrane technology. Herein, we report a nickel-polyethersulfone (Ni-PES) composite membrane modified by platinum (Pt) to function simultaneously as a highly active hydrogen evolution reaction (HER) electrode and a hydrogen-selective membrane. The Ni-PES membrane was prepared by phase inversion tape casting and atmospheric sintering, in which PES polymer provides the structural skeleton and metallic nickel serves as the electronic conductor and HER catalyst. Moreover, proper heat-treatment changes the microstructure and hydrophobicity of Ni-PES membrane, and Pt electrodeposition significantly boosts HER activity. The optimized Pt@Ni-PES-400 membrane electrode achieves a low overpotential of 104.9 mV@100 mA cm⁻² and a Tafel slope of 125.8 mV dec⁻¹ in concentrated alkaline electrolyte (30 wt% KOH). Furthermore, we design and fabricate a H-type, diaphragm-free, and two-chamber electrolytic cell, which is separated by Ni-PES-based membrane. Such membrane-based H cell realizes the combination of hydrogen production and separation processes: the in-situ generated hydrogen via water electrolysis is transported through the Pt@Ni-PES-400 membrane to the gas collection chamber, with a hydrogen purity of up to 99.95 % and a hydrogen permeation rate of 0.18 mL min⁻¹ cm⁻² at an overpotential of −500 mV, and the cell performance remains stable during 100 h of operation.

碱水电解（ALK）面临着电解效率低、能耗高、膜技术的局限性等技术挑战。本文报道了一种由铂（Pt）修饰的镍聚醚砜（Ni-PES）复合膜，该膜同时具有高活性析氢反应（HER）电极和氢选择膜的功能。采用相变带铸造和大气烧结法制备了Ni-PES膜，其中PES聚合物作为膜的结构骨架，金属镍作为膜的电子导体和HER催化剂。此外，适当的热处理改变了Ni-PES膜的微观结构和疏水性，Pt电沉积显著提高了HER活性。优化后的Pt@Ni-PES-400膜电极在浓碱性电解质（30 wt% KOH）中获得了104.9 mV@100 mA cm−2的低过电位和125.8 mV dec−1的Tafel斜率。此外，我们设计并制造了一个h型，无隔膜，双腔电解槽，由ni - pes基膜分离。该膜基氢电池实现了产氢和分离过程的结合：通过电解水原位生成的氢气通过Pt@Ni-PES-400膜输送到气体收集室，氢气纯度可达99.95%，在过电位为- 500 mV时，氢气渗透率为0.18 mL min - 1 cm - 2，电池性能在运行100 H内保持稳定。

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引用次数: 0

Hydration size-dependent transport of ions across nanoporous graphene membranes 离子在纳米多孔石墨烯膜上的水化大小依赖的传输

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-17 DOI: 10.1016/j.memsci.2026.125157

Chun Man Chow , Simar Kaur Mattewal , Emily Hanhauser , Rohit Karnik

Nanoporous atomically-thin membranes are promising candidates for metal ion separations due to their chemical stability and high permeance and selectivity, but experimental evidence of the mechanisms responsible for ion-ion selectivity is sparse. Here, we measured the simultaneous diffusion of a dilute mixture of ten different Group I, Group II, and rare earth cations in a salt background across nanoporous graphene (NPG) membranes with sub-nanometer pores. The membranes exhibited ion-ion selectivity, including between similarly-charged ions. Cation transport was governed primarily by the hydrated ion size that was consistent with continuum models of ion diffusion, with additional influence of the ionic charge. Selectivity enhancement was achieved by modifying ion sizes using an ion-selective complexing agent. Our study provides evidence of the importance of size-sieving and electrostatic mechanisms governing ion transport across NPG, and allows for quantitative prediction of transport rates to guide future development of ion-selective atomically-thin membranes.

纳米孔原子薄膜由于其化学稳定性和高渗透性和选择性而成为金属离子分离的有希望的候选者，但关于离子-离子选择性机制的实验证据很少。在这里，我们测量了盐背景下十种不同的I族、II族和稀土阳离子的稀释混合物在具有亚纳米孔的纳米多孔石墨烯（NPG）膜上的同时扩散。膜表现出离子-离子的选择性，包括相似的带电离子之间的选择性。阳离子输运主要受水合离子大小的控制，这与离子扩散的连续模型一致，并受到离子电荷的额外影响。选择性增强是通过使用离子选择性络合剂改变离子大小来实现的。我们的研究提供了粒度筛选和静电机制控制离子在NPG中的传输的重要性的证据，并允许对传输速率进行定量预测，以指导离子选择性原子薄膜的未来发展。

引用次数: 0

Incorporating controlled nanovoids into thin-film nanocomposite membranes to enhance boron rejection and improve desalination performance 在薄膜纳米复合膜中加入可控的纳米空隙以增强硼的吸附和改善脱盐性能

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-17 DOI: 10.1016/j.memsci.2026.125167

M. Shahnawaz Khan , Sidi Zhu , Tai-Shung Chung , Shing Bor Chen

The growing demand for energy-efficient desalination technologies necessitates the development of advanced membranes capable of addressing challenges for both boron rejection and water recovery in brackish water desalination. Conventional thin-film composite (TFC) reverse osmosis (RO) membranes, though highly selective for salt, often exhibit limited water permeability due to their dense polyamide layer. To address this, recent approaches have incorporated nanofillers to create additional transport pathways; however, many require post-synthetic treatments that risk damaging the membrane structure and reducing crosslinking density. In this study, we propose a sacrificial hybrid nanostructure-assisted strategy by integrating ZIF-67 with LDH to engineer nanovoids within TFN membranes, exploiting the aqueous instability of ZIF-67 and the interfacial interaction characteristics of LDH to enhance selective transport and boron removal. Membrane morphology, surface properties, and interfacial chemistry were systematically characterized using FESEM, AFM, XPS, zeta potential analysis and water contact angle. The optimized TFN membrane (M3) achieved a water permeance of 3.72 ± 0.2 LMH bar⁻¹, representing almost 69 % increament over the control membrane, while maintaining a high NaCl rejection of 99.52 % and an improved boron rejection of 81.92 % at pH 8. A long-term stability test conducted over 7 days showed no significant change in salt rejection, indicating that the nanovoid formation strategy does not introduce non-selective defects or compromise membrane integrity. In addition, M3 demonstrates effective boron rejection and water recovery from actual seawater permeate (collected from the Tuas Desalination Plant, Singapore). This work demonstrates that balancing the permeability–selectivity trade-off using hybrid nanofillers through nanovoid engineering provides a viable route for enhancing boron-selective desalination performance without additional post-treatment steps.

对节能脱盐技术的需求日益增长，需要开发能够解决咸淡水脱盐中硼的去除和水回收挑战的先进膜。传统的薄膜复合（TFC）反渗透（RO）膜虽然对盐有很高的选择性，但由于其致密的聚酰胺层，通常表现出有限的透水性。为了解决这个问题，最近的方法是加入纳米填料来创建额外的运输途径；然而，许多合成后处理需要冒着破坏膜结构和降低交联密度的风险。在这项研究中，我们提出了一种牺牲型杂化纳米结构辅助策略，将ZIF-67与LDH结合，利用ZIF-67的水稳定性和LDH的界面相互作用特性，在TFN膜内设计纳米空隙，以增强选择性运输和硼的去除。利用FESEM、AFM、XPS、zeta电位分析和水接触角对膜的形貌、表面性质和界面化学进行了系统表征。优化后的TFN膜（M3）的水透率为3.72±0.2 LMH bar−1，比对照膜提高了近69%，同时在pH为8时保持了99.52%的高NaCl截留率和81.92%的硼截留率。一项超过7天的长期稳定性测试显示，盐排斥没有显著变化，这表明纳米孔隙形成策略不会引入非选择性缺陷或损害膜的完整性。此外，M3还展示了从实际渗透海水（从新加坡大士海水淡化厂收集）中有效地去除硼和回收水。这项工作表明，通过纳米孔隙工程，利用混合纳米填料平衡渗透率和选择性之间的权衡，为提高硼选择性海水淡化性能提供了一条可行的途径，无需额外的后处理步骤。

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引用次数: 0

Hexamethyltruxene-based hyper-crosslinked porous polymers as fillers in polysulfone membranes for H2 separation 超交联多孔聚合物在聚砜膜H2分离中的应用

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-17 DOI: 10.1016/j.memsci.2026.125159

Sara Izquierdo , Nayara Méndez-Gil , Mohammad Afsar Uddin , Berta Gómez-Lor , Mar López-González , Eva M. Maya

This work reports novel efficient polysulfone mixed matrix membranes (MMMs) for the separation of H₂ from hydrocarbons, such as methane and ethylene. The polysulfone matrix (PSF) are filled with a new hypercrosslinked polymer (HCP) based on methyl truxene (MeTx) units, which has been synthesized via mechanochemical polymerization. This method enables the sustainable production of the MeTx-HCP filler in just 3 h, offering excellent thermal stability, 43 % porosity, and a specific surface area of 1076 m²/g. Two MMMs containing 20 % and 30 % by weight of filler were prepared, and their transport properties for O₂, N₂, CO₂, H₂, CH₄, and C₂H₄ were evaluated. Compared to pure polysulfone, the incorporation of MeTx-HCP filler led to an increase in all permeability coefficients were obtained, along with enhanced selectivity for the separation of most gas pairs. Notably, H₂ transport exhibited a significant enhancement, with permeability increasing by 234 % for membranes containing 20 % MeTx-HCP and by 836 % for those with 30 % filler, compared to neat polysulfone. The membranes exhibited H₂ permeability values of 26,4 and 74 respectively. Additionally, for membrane containing 20 % MeTx-HCP, H₂/C₂H₄ selectivity increased to 74 %, while H₂/CH₄ selectivity improved by up to 39 % with selectivity values of 36.2 and 44 respectively. For the latter gas pair, the separation performance exceeded that of other polysulfone membranes incorporating porous organic polymers, underscoring the strong potential of these mixed-matrix membranes (MMMs) for industrial H₂ separation applications.

本文报道了一种新型高效聚砜混合基质膜（MMMs），用于从碳氢化合物（如甲烷和乙烯）中分离H2。采用机械化学聚合法制备了一种以甲基truxene （MeTx）为基的新型超交联聚合物（HCP）填充聚砜基体（PSF）。这种方法可以在3小时内持续生产MeTx-HCP填料，具有出色的热稳定性，43%的孔隙率和1076 m2/g的比表面积。制备了填料质量分数分别为20%和30%的mmmm，并对其对O2、N2、CO2、H2、CH4和C2H4的输运性能进行了评价。与纯聚砜相比，MeTx-HCP填料的掺入提高了所有渗透系数，同时提高了大多数气体对分离的选择性。值得注意的是，与纯聚砜相比，含有20% MeTx-HCP的膜的渗透率提高了234%，含有30%填料的膜的渗透率提高了836%。膜的H2渗透率分别为26、4和74。此外，对于含有20% MeTx-HCP的膜，H2/C2H4选择性提高到74%，H2/CH4选择性提高到39%，选择性值分别为36.2和44。对于后一种气体对，其分离性能优于其他含有多孔有机聚合物的聚砜膜，这表明这些混合基质膜（MMMs）在工业氢气分离方面具有强大的应用潜力。

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引用次数: 0

Vapor-phase crystalline transformation of metal-organic framework membranes for efficient hydrogen separation 用于高效氢分离的金属-有机骨架膜的气相结晶转变

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-16 DOI: 10.1016/j.memsci.2026.125168

Pengcheng Su , Jiahao Zhang , Wufeng Wu , Yihao Xiao , Taotao Xu , Shibiao Wu , Yaqin Wang , Wanbin Li

Metal−organic framework (MOF) membranes have shown dramatic potential in gas separation applications. However, there still great challenges exist in controlling gas transport pathways at atomic level to realize sharp molecular sieving. Here, we report vapor-phase crystalline transformation of ZIF-8 membranes by linker exchange strategy for precise hydrogen separation. Through exchanging parent 2-methylimidazole (MeIM) linkers by the incoming benzimidazole (BIM) linkers, ZIF-8 can transform into various crystal phases. The introduced bulky BIM with larger steric hindrance can narrow intrinsic apertures and suppress linker flexibility, thus enhancing the molecular sieving abilities. The resulting membranes show substantially improved separation performances with H₂/CO₂, H₂/N₂ and H₂/CH₄ selectivities up to 70.5, 89.2 and 101.2, respectively, accompanied by high H₂ permeance of 14.3 × 10⁻⁸ mol m⁻² s⁻¹ Pa⁻¹ as well as good reproducibility, thermal stability and long-term sustainability. We envisage that this simple vapor-phase crystalline transformation strategy offers an alternative route to prepare high-performance membranes for precise separations and other various applications.

金属-有机骨架（MOF）膜在气体分离应用中显示出巨大的潜力。然而，如何在原子水平上控制气体输运途径，实现分子的快速筛分，仍存在很大的挑战。在这里，我们报道了通过连接剂交换策略实现ZIF-8膜的气相结晶转变，以实现精确的氢分离。通过进入的苯并咪唑（BIM）连接物交换母体2-甲基咪唑（MeIM）连接物，ZIF-8可以转变成各种晶相。引入具有较大位阻的体积较大的BIM，可以缩小本征孔径，抑制连接体柔韧性，从而增强分子筛分能力。制备的膜具有较好的分离性能，H2/CO2、H2/N2和H2/CH4选择性分别高达70.5、89.2和101.2，H2透过率高达14.3 × 10−8 mol m−2 s−1 Pa−1，具有良好的再现性、热稳定性和长期可持续性。我们设想这种简单的气相结晶转变策略为制备用于精确分离和其他各种应用的高性能膜提供了另一种途径。

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引用次数: 0