Journal of Membrane Science最新文献_第8页

Enhancing electrodialysis acid recovery performance of highly anion-selective crosslink network of alkyl-bridged double-cage tetra-cations by tadpole-type ion modification 蝌蚪型离子修饰提高高阴离子选择性烷基桥联双笼四阳离子交联网络的电渗析酸回收性能

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-03 DOI: 10.1016/j.memsci.2026.125126

Dengyue Mao , Jiaxin Zhang , Xiuhua Li , Yigang Yu

Electrodialysis (ED) acid recovery technology has become a research hotspot in waste acids reuse due to the advantages of low energy consumption, environmental friendliness and high efficiency. To develop anion exchange membranes (AEMs) with high acid-blocking capability and conductivity, a tailored series of n-alkylene-bridged di-tertiary-amines (named DDC_m, m represents the number of carbon atoms in the alkylene chains) had been used to build and tune the balance level between acid-blocking and conductivity of the derivate crosslinking topological networks (named QPAES-0.3DDC_m) containing n-alkylene-bridged double-cage tetra-cations in the presence of chloromethylated polyethersulfone as the backbone. The electrical properties of the optimized multi-cations crosslink topological network QPAES-0.3DDC₁₀ with specific nanophase-separated structure and initially balanced electric properties have been tuned flexibly by grafting various amounts of tadpole-type cations with strongly hydrophobic tails, giving crosslink AEMs of QPAES-xD-0.3DDC₁₀ (xD represents a certain grafting degree) with modified nanophases structures. Their structure, basic properties, electrical properties and ED acid recovery performance were systematically investigated. The results confirm that moderate grafting endows QPAES-0.3D-0.3DDC₁₀ co-aggregate mono nanophase structure, offering the best selectivity and conductivity among the tailored AEMs. In ED H₂SO₄ recovery competitions at 40 mA cm⁻² - 80 mA cm⁻² and various ED times, QPAES-0.3D-0.3DDC₁₀ always surpasses commercial acid-blocking ACM in current efficiency and energy consumption. These above results clear that the strategy of tuning the aggregate phases of multi-cations crosslinked basic topological network by tadpole-type cation grafting is efficient to balance acid-blocking capability and conductivity, revealing its potential in ED acid recovery application.

电渗析（ED）酸回收技术以其低能耗、环保、高效等优点成为废酸再利用的研究热点。为了开发具有高阻酸能力和导电性的阴离子交换膜（AEMs），定制了一系列的正烷基桥接二叔胺（DDCm），m表示烷基烯链中的碳原子数)被用来建立和调整含有正烷基桥接双笼型四阳离子、氯甲基化聚醚砜为主链的衍生交联拓扑网络（命名为QPAES-0.3DDCm）的酸阻和电导率之间的平衡水平。优化后的多阳离子交联拓扑网络QPAES-0.3DDC10具有特定的纳米相分离结构和初步平衡的电学性能，通过接枝不同数量的具有强疏水尾部的蝌蚪型阳离子，可以灵活地调整其电学性能，得到具有修饰纳米相结构的QPAES-xD-0.3DDC10 （xD表示一定接枝程度）的交联AEMs。系统地研究了它们的结构、基本性能、电学性能和ED酸回收性能。结果证实，适度接枝可获得QPAES-0.3D-0.3DDC10共聚集体的单纳米结构，在定制AEMs中具有最佳的选择性和导电性。在40 mA cm - 2 - 80 mA cm - 2和各种ED时间下的H2SO4回收比赛中，QPAES-0.3D-0.3DDC10在电流效率和能耗方面始终优于商用酸阻断ACM。上述结果表明，通过蝌蚪型阳离子接枝调整多阳离子交联基本拓扑网络的聚集相可以有效地平衡酸阻能力和电导率，揭示了其在ED酸回收应用中的潜力。

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引用次数: 0

The slightly branched-structure design of polyimides simultaneously enhances anti-plasticization and CO2 separation performance 聚酰亚胺的微支化结构设计同时提高了抗塑性和CO2分离性能

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-03 DOI: 10.1016/j.memsci.2025.125118

Ning Li , Jinke Wang , Shilin Nie , Yuanyuan Wang , Leixin Yang , Ge Wang , Yuchao Ma , Dengkun Shu , Chenyang Li , Kaihua Li , Chen Luo , Bowen Cheng

The escalating demand for carbon capture has heightened interest in membrane-based gas separation technologies. Nevertheless, conventional polymeric membranes are constrained by plasticization and the trade-off between permeability and selectivity. In this study, we proposed a slightly branch-structure design strategy to construct branched polyimide (PI), which significantly enhances gas separation performance and anti-plasticization properties. With the incorporation of branched agent, the linear PI converts to branched PI, which suppresses chain dense packing and provides more free volume elements. Therefore, the branching architecture effectively restricts segmental mobility and reinforces interchain rigidity of PI, leading to significantly improved plasticization resistance from 16 atm to 30 atm. Interestingly, with the increase of rigid and free volume, the permeability and selectivity improved simultaneously in branched PI. Specifically, compared with pristine PI, the CO₂ permeability and CO₂/CH₄ selectivity are increased by 139.7 % and 20 % in branched PI with 5 wt% modification, respectively. Our findings proposed a simple and effective strategy for designing industrial polymers with improved performance and anti-plasticization properties for practical applications in gas separation membranes.

对碳捕获的不断增长的需求提高了人们对膜基气体分离技术的兴趣。然而，传统的聚合物膜受到塑化和渗透率和选择性之间的权衡的限制。在这项研究中，我们提出了一种轻微分支结构的设计策略来构建支化聚酰亚胺（PI），该策略显著提高了气体分离性能和抗塑化性能。随着支链剂的加入，线性PI转化为支链PI，抑制了链密堆积，提供了更多的自由体积元。因此，支链结构有效地限制了PI的节段迁移性，增强了PI的链间刚性，从而使其抗塑化性能从16 atm显著提高到30 atm。有趣的是，随着刚性体积和自由体积的增加，支链PI的渗透率和选择性同时提高。具体来说，与原始PI相比，改性5 wt%支链PI的CO2渗透率和CO2/CH4选择性分别提高了139.7%和20%。我们的发现提出了一种简单有效的策略来设计具有改进性能和抗塑性的工业聚合物，用于实际应用的气体分离膜。

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引用次数: 0

Synergistic anchoring of emulsion-encapsulated phosphoric acid in cytosine-modified SPEEK toward durable direct methanol fuel cells 胞嘧啶修饰SPEEK中乳液包封磷酸对耐用直接甲醇燃料电池的协同锚定

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-03 DOI: 10.1016/j.memsci.2026.125122

Bingyao Sun , Xingao Sun , Zhuo Li , Lin Yang , Hai Liu , Fuqiang Hu , Zushun Xu , Quanyuan Zhang

The development of high-performance proton exchange membranes (PEMs) for direct methanol fuel cells (DMFCs) is often constrained by a fundamental trade-off: enhancing proton conductivity typically compromises dimensional stability. While phosphoric acid (PA) doping is an effective strategy to boost conductivity, its severe leaching in aqueous environments severely limits its application in low-temperature DMFCs. Herein, we propose a novel paradigm inspired by pharmaceutical encapsulation to overcome this challenge. A stable water-in-oil (W/O) emulsion is designed to encapsulate hydrophilic PA, which is then blended with a cytosine-functionalized SPEEK matrix. This innovative approach enables adjustment of the acid doping level (ADL). More importantly, it establishes a dual-retention mechanism: the quaternary ammonium groups of the emulsifier (STDAB) form ionic bonding with H₂PO₄⁻ anions within the emulsion droplets, while the basic –NH– groups of cytosine act as molecular anchors for free PA via acid-base interactions. The synergistic effect of physical encapsulation and chemical anchoring endows the fabricated composite membrane with exceptional performance. It achieves a remarkable proton conductivity of 174.9 mS cm⁻¹ at 80 °C, which is 2.3 times that of pristine SPEEK. Furthermore, the membrane exhibits outstanding operational stability, retaining 85.5 % of its voltage after 280 h of continuous operation, underscoring its significant potential for practical DMFC applications.

用于直接甲醇燃料电池（dmfc）的高性能质子交换膜（PEMs）的发展经常受到一个基本权衡的限制：提高质子导电性通常会损害尺寸稳定性。虽然磷酸（PA）掺杂是提高电导率的有效策略，但其在水环境中的严重浸出严重限制了其在低温dmfc中的应用。在此，我们提出了一种受药物封装启发的新范式来克服这一挑战。设计了一种稳定的油包水（W/O）乳液来封装亲水性PA，然后将其与胞嘧啶功能化的SPEEK基质混合。这种创新的方法可以调整酸掺杂水平（ADL）。更重要的是，它建立了双重保留机制：乳化剂的季铵盐基团（STDAB）与乳化剂液滴内的H2PO4 -阴离子形成离子键，而胞嘧啶的碱性- nh3 -基团通过酸碱相互作用作为游离PA的分子锚点。物理包封和化学锚定的协同作用使所制备的复合膜具有优异的性能。在80°C时，它的质子电导率达到174.9 mS cm−1，是原始SPEEK的2.3倍。此外，该膜表现出出色的运行稳定性，在连续运行280小时后保持85.5%的电压，强调了其在DMFC实际应用中的巨大潜力。

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引用次数: 0

Towards the development of a user-friendly microfluidic platform for monitoring interfacial polymerization: guidelines for membrane scientists 面向用户友好的微流控平台的开发，用于监测界面聚合：膜科学家指南

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-03 DOI: 10.1016/j.memsci.2026.125121

Scout Caspers , Omar Elshawarby , Rhea Verbeke , Ines Nulens , Xing Yang , Ivo F.J. Vankelecom

Interfacial polymerization (IP) is a technique widely used to synthesize thin-film composite (TFC) membranes. However, the inherent complexity of interfacial systems hinders achieving deeper insights into the film formation mechanism. In-situ characterization of IP by means of microfluidics is a promising approach for this purpose. Stable interfaces are essential for microfluidic-based IP, yet they can be difficult to maintain in parallel-flow devices. Therefore, this work aims to bridge disciplines by translating established microfluidic design principles and experimental techniques into actionable insights and guidelines for membrane technology. The effect of channel dimensions and microfluidic pillar configuration on the interfacial stability in parylene-coated polydimethylsiloxane (PDMS) microchannels was investigated through microscopy experiments, theoretical calculations, and computational fluid dynamics (CFD). Stable liquid-air (L-A) and liquid-liquid (L-L) interfaces were formed by the presence of a hydrophobic stop valve. Increasing the channel height and square-shaped pillars resulted in the most stable interfaces. Microfluidic-based IP was successfully performed, whereas brightfield imaging revealed the solvent's impact on film structure and formation kinetics. Finally, a cheap and easy-to-use microfluidic platform is proposed. The liquids could simply be injected into the channels with a pipet, entirely omitting the need for external flow control. This work aims to provide guidelines for membrane researchers, enabling them to tailor microfluidic platforms for understanding IP film formation for different applications.

界面聚合（IP）是一种广泛用于合成薄膜复合材料（TFC）的技术。然而，界面系统固有的复杂性阻碍了对膜形成机制的深入了解。利用微流控技术对IP进行原位表征是一种很有前途的方法。稳定的接口对于基于微流体的IP来说是必不可少的，但它们在并行流设备中很难维护。因此，这项工作旨在通过将已建立的微流体设计原理和实验技术转化为膜技术的可操作见解和指导方针来弥合学科之间的联系。通过显微实验、理论计算和计算流体力学（CFD）等方法研究了通道尺寸和微流控柱构型对聚二甲基硅氧烷（PDMS）微通道界面稳定性的影响。疏水截止阀的存在形成了稳定的液-气（L-A）和液-液（L-L）界面。增大通道高度和柱形为方形时，界面最稳定。基于微流体的IP成功进行，而明场成像揭示了溶剂对膜结构和形成动力学的影响。最后，提出了一种廉价、易用的微流控平台。液体可以简单地用移液管注入通道，完全不需要外部流动控制。这项工作旨在为膜研究人员提供指导，使他们能够定制微流控平台，以了解不同应用的IP膜形成。

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引用次数: 0

High-dielectric sulfonyl-functionalized polyamide (SPA) hierarchical porous separator for lithium metal batteries 锂金属电池用高介电磺酰基功能化聚酰胺分级多孔分离器

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-02 DOI: 10.1016/j.memsci.2026.125125

Qinghai Chen , Dandan Yang , Zhiguang Zhang , Shuanyan Kang , Junfen Li , Yingcan Zhao , Nanwen Li

The electrical properties of separators, including their dielectric constant, are a critical design parameter for lithium metal batteries. This work introduces the dielectric constant as a key parameter and fabricates two sulfonyl-functionalized polyamide (SPA) separators with high dielectric constants via vapor-induced phase separation (VIPS). Density functional theory (DFT) calculations reveal that the high dielectric constant of the SPA separators significantly promotes Li⁺ dissociation, thus facilitating ion transport. As a result, the optimized IPC-AS44 separator exhibits a high ionic conductivity of 0.93 mS cm⁻¹ and an improved Li ⁺ transference number of 0.61 at 25 °C. In LFP/Li cells, our prepared IPC-AS44 separator enables a high discharge capacity of 139.8 mAh g⁻¹ and superior capacity retention of 80 % after 200 cycles at 1 C. And NCM811/Li cell using the IPC-AS44 separator delivers outstanding capacity retention and cycling stability, sustaining a reversible specific capacity of 124.3 mAh g⁻¹ over 200 cycles at 1 C. Furthermore, the Li/Li symmetric cells demonstrate that the high-dielectric-constant SPA separator promotes homogeneous lithium deposition, which is crucial for safety. Combined with exceptional thermal stability (above 200 °C) and a high electrolyte uptake rate (up to 373 %), this work establishes the implementation of high-dielectric-constant separators as a transformative strategy for enhancing ion transport, cycling stability, and safety in lithium metal batteries.

隔膜的电学性能，包括介电常数，是锂金属电池的关键设计参数。本文引入介电常数作为关键参数，利用气相分离技术制备了两种具有高介电常数的磺胺功能化聚酰胺（SPA）分离器。密度泛函理论（DFT）计算表明，高介电常数的SPA分离器显著促进了Li+的解离，从而促进了离子的传输。结果表明，优化后的IPC-AS44分离器在25°C时具有0.93 mS cm−1的高离子电导率和0.61的Li +转移数。在LFP/Li电池中，我们制备的IPC-AS44隔膜可实现139.8 mAh g - 1的高放电容量，在1℃下200次循环后，其容量保持率高达80%。使用IPC-AS44隔膜的NCM811/Li电池具有出色的容量保持和循环稳定性，在1℃下200次循环中保持124.3 mAh g - 1的可逆比容量。此外，Li/Li对称电池表明，高电介质常数SPA隔膜促进均匀锂沉积。这对安全至关重要。结合优异的热稳定性（高于200°C）和高电解质吸收率（高达373%），这项工作建立了高介电常数分离器的实施，作为提高锂金属电池离子传输、循环稳定性和安全性的变革策略。

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引用次数: 0

Template-free synthesis of CHA zeolite membranes with improved stability using exotic KFI zeolite seeds 利用外来KFI沸石种子无模板合成稳定性更好的CHA沸石膜

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-02 DOI: 10.1016/j.memsci.2025.125119

Yi Qian , Tiehao Ma , Zhenhao Lu , Zhanzhao Yang , Guoliang Dai , Ruifeng Song , Ji Jiang , Xuerui Wang , Xuehong Gu

This study reports heterogeneous synthesis of highly acid-resistant CHA zeolite membranes using exotic KFI zeolites as seeds, without organic structure-directing agents (OSDA), fluoride, or Sr²⁺/Cs⁺ mineralizers. The crystallization behavior of the CHA zeolite membranes was systematically investigated with respect to precursor water content, alkalinity and synthesis duration. Under optimized synthesis conditions (gel composition: 8.5 SiO₂: 1.2 Al₂O₃: 2.75 K₂O: 900H₂O; temperature: 150 °C; time: 16 h), the membranes exhibited an average water permeation flux of 6.33 kg m⁻² h⁻¹ and a separation factor of 6025 during dehydration of a 90 wt% ethanol solution at 75 °C. Long-term stability assessments demonstrated that the membrane exhibited high acid stability in 90 wt% acidic ethanol solution for over 660 h. These findings underscore the membranes’ promising applicability for dehydration processes involving acidic organic solvents.

本研究报道了以外来KFI沸石为种子，不使用有机结构导向剂（OSDA）、氟化物或Sr2+/Cs+矿化剂，异相合成高耐酸CHA沸石膜。系统地考察了前驱体含水量、碱度和合成时间对CHA沸石膜结晶行为的影响。在优化的合成条件下（凝胶组成：8.5 SiO2: 1.2 Al2O3: 2.75 K2O: 900H2O，温度：150℃，时间：16 h），在75℃下，90 wt%乙醇溶液脱水，膜的平均水渗透通量为6.33 kg m−2 h−1，分离系数为6025。长期稳定性评估表明，该膜在90%的酸性乙醇溶液中表现出超过660小时的高酸稳定性。这些发现强调了该膜在涉及酸性有机溶剂的脱水过程中的良好适用性。

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引用次数: 0

High-performance polyamide/ceramic composite membrane featuring tannic acid-Fe(III) interlayer for antibiotic desalination and thermostable nanofiltration 以单宁酸-铁（III）为中间层的高性能聚酰胺/陶瓷复合膜用于抗生素脱盐和耐高温纳滤

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-02 DOI: 10.1016/j.memsci.2025.125117

Zefania Praventia Sutrisno , Can Li , Zhili Dong , Rong Wang

Global challenges such as rising antibiotic contamination and energy-intensive desalination have intensified the demand for membranes that deliver both high separation performance and thermal resilience. This work presents a novel polyamide (PA)/ceramic composite nanofiltration (NF) membrane integrating a tannic acid–Fe(III) (TA–Fe) interlayer, engineered for efficient antibiotic desalination and stable high-temperature operation. The in-situ TA–Fe interlayer was rapidly assembled onto large-pore (200 nm) alumina ceramic substrate, followed by the PA selective layer formation via interfacial polymerization. This interlayer not only provided a “gutter-layer” effect to enhance water flux but also enabled formation of an ultrathin and continuous PA layer through controlled polymerization reaction process, reducing the PA thickness from ∼146 nm in the interlayer-free membrane to 29–38 nm in the interlayered membranes. Moreover, the TA–Fe interlayer improved the retention of amine monomers and moderated their diffusion, yielding the PA layer with tailored pore size distribution and negative surface charge favorable for ion discrimination and molecular separation. The optimized membrane demonstrated a pure water permeance of 31.3 L m⁻² h⁻¹ bar⁻¹, Na₂SO₄ rejection of 93.4 % and excellent antibiotic desalination performance, with an NaCl/erythromycin separation factor of ∼120. Furthermore, the membrane exhibited exceptional thermal stability, maintaining performance over extended operation at temperatures up to 80 °C and outperforming the commercial NF270 benchmark in both water permeance and durability. With its simple and scalable fabrication route, coupled with desirable separation performance and robust thermal resilience, this TA–Fe interlayered PA/ceramic composite membrane offers a promising platform for next-generation NF applications—especially in pharmaceutical wastewater treatment, high-temperature desalination, and other demanding separation environments.

抗生素污染和能源密集型海水淡化等全球性挑战加剧了对兼具高分离性能和热弹性的膜的需求。本研究提出了一种新型聚酰胺(PA)/陶瓷复合纳滤（NF）膜，该膜集成了单宁酸- fe (III) （TA-Fe）中间层，用于高效的抗生素脱盐和稳定的高温操作。将原位TA-Fe层快速组装到大孔（200 nm）氧化铝陶瓷衬底上，然后通过界面聚合形成PA选择层。该夹层不仅提供了“排水沟层”效应以增强水通量，而且通过控制聚合反应过程形成超薄连续的PA层，将无夹层膜的PA厚度从~ 146 nm降低到29-38 nm。此外，TA-Fe中间层提高了胺类单体的保留并减缓了它们的扩散，从而产生了具有定制孔径分布和有利于离子识别和分子分离的负电荷的PA层。优化后的膜的纯水渗透率为31.3 L m−2 h−1 bar−1，Na2SO4去除率为93.4%，具有良好的抗生素脱盐性能，NaCl/红霉素分离系数为~ 120。此外，该膜表现出优异的热稳定性，在高达80°C的温度下保持长时间运行的性能，并且在透水性和耐久性方面优于商用NF270基准。由于其简单且可扩展的制造路线，加上理想的分离性能和强大的热弹性，这种TA-Fe层间PA/陶瓷复合膜为下一代NF应用提供了一个有前途的平台，特别是在制药废水处理，高温脱盐和其他苛刻的分离环境中。

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引用次数: 0

Salt-mediated interfacial polymerization for nanostructure tuning of cyclodextrin-based thin film composite membranes 盐介面聚合用于环糊精基薄膜复合膜的纳米结构调整

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-02 DOI: 10.1016/j.memsci.2026.125124

Jinting Hu , Sem Bleus , Linde Achten , Alexander Volodin , Samuel Eyley , Wim Thielemans , Wim Dehaen , Xing Yang

Porous materials with intrinsic cavities, such as β-cyclodextrin (β-CD), are promising building blocks of membranes. However, conventional interfacial polymerization (IP) often produces thick, disordered polymeric network that instead blocks their cavity interconnections and sacrifices their intrinsic advantages. To overcome this issue, this study proposed a novel salt-mediated IP strategy that leverages the cation ^… β-CD coordination (namely M⁺ ^… β-CD) effect to regulate monomer diffusion towards the aqueous-organic interface, resulting in a thinner and more ordered β-CD layer in thin-film composite (TFC) membranes. The mechanisms by which salt additives influence membrane properties were explored in-depth in terms of the membrane surface morphology, chemical composition and physical properties. With a deliberately chosen series of salt additives (i.e., LiCl, NaCl, KCl, K₂CO₃, and K₂SO₄), the salt additives significantly enhanced the stability of the polyester (PE) film in the TFC membrane. The more crumpled nanostructure and increased free volume in the mediated IP layer were also elucidated via the changes in the specific heat of the aqueous solution, and the presence of salt crystals. The types and dosages of the salt additive played significant roles on the membrane performance. Notably, the membrane synthesized with 3.0 wt% K₂SO₄ demonstrated both enhanced permeance of 57.3 L m⁻²·hr⁻¹·bar⁻¹ and high rejection for both anionic and cationic dyes (i.e., 99.9 % for Victoria Pure Blue BO (VPB BO), and 99.4 % for Direct Red 23 (DR23)), achieving sustainable performance in dye/salt fractionation under high salinity conditions. This work fills an important knowledge gap in the understanding the effectiveness of inorganic salt additives in tuning IP dynamics for macrocyclic monomers, presenting a cost-effective approach to fabricate high-performance membranes.

具有固有空腔的多孔材料，如β-环糊精（β-CD），是很有前途的膜构建材料。然而，传统的界面聚合（IP）通常会产生厚的、无序的聚合物网络，从而阻碍了它们的腔互连，牺牲了它们固有的优势。为了克服这一问题，本研究提出了一种新的盐介导的IP策略，该策略利用阳离子- β-CD配位（即M+ - β-CD）效应来调节单体向水-有机界面的扩散，从而使薄膜复合材料（TFC）膜中的β-CD层更薄、更有序。从膜的表面形貌、化学组成和物理性质等方面深入探讨了盐添加剂影响膜性能的机理。通过精心选择一系列盐添加剂（LiCl, NaCl, KCl, K2CO3, K2SO4），盐添加剂显著增强了聚酯（PE）膜在TFC膜中的稳定性。水溶液比热的变化和盐晶体的存在也说明了介导的IP层中纳米结构的皱褶和自由体积的增加。盐添加剂的种类和用量对膜的性能有显著影响。值得注意的是，用3.0 wt% K2SO4合成的膜不仅提高了57.3 L m−2·hr−1·bar−1的渗透率，而且对阴离子和阳离子染料都有很高的截留率（即维多利亚纯蓝BO （VPB BO）为99.9%，直接红23 （DR23）为99.4%），在高盐度条件下实现了染料/盐分离的可持续性能。这项工作填补了理解无机盐添加剂在调节大环单体IP动力学方面的有效性方面的重要知识空白，提出了一种经济有效的方法来制造高性能膜。

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引用次数: 0

Hourglass-like structure tailoring of PES-b-PEG microfiltration membranes via varying humid air bath time PES-b-PEG微滤膜的沙漏状结构随湿空气浴时间的变化而变化

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-02 DOI: 10.1016/j.memsci.2026.125123

Jingtai Wang , Wenliang Wang , Niamat Ullah , Ming Qi , Ningxin Zhou , Yunxia Hu

A novel high-flux polyethersulfone-block-polyethylene glycol (PES-b-PEG) microfiltration (MF) membrane was developed via the vapor-assisted non-solvent-induced phase separation (V-NIPS) method using a 10-s humid air bath. Compared to control PES membranes, the PES-b-PEG membranes exhibit a looser, hourglass-like structure with higher porosity, larger pore diameters, and enhanced water flux and filtration capacity. The onset position of the hourglass-like pores can be finely tuned by adjusting the humid air bath time, enabling significant control over pore diameter and water permeance. Incorporation of PEG into the block copolymer, along with the low viscosity of the casting solution, accelerates water uptake and improves compatibility with water during V-NIPS, promoting efficient vapor-induced phase separation (VIPS) and the formation of a looser, highly permeable structure. With a 10-s air bath, the PES-b-PEG membrane achieves water flux of 45,712 L m⁻² h⁻¹ bar⁻¹, a pore diameter of 0.8 μm, 99.5 % rejection of 1.0 μm polystyrene microspheres, and a filtration capacity of 1,233 L m⁻² (at 10 % flux decline). This study highlights the advantages of PES-b-PEG block copolymers for producing high-performance MF membranes with a tailorable hourglass-like architecture via ultrashort humid air exposure.

采用气相辅助非溶剂诱导相分离（V-NIPS）方法，在10s湿空气浴条件下制备了一种新型高通量聚醚砜-嵌段聚乙二醇（PES-b-PEG）微滤膜。与对照PES膜相比，PES-b- peg膜具有更疏松的沙漏状结构，孔隙率更高，孔径更大，水通量和过滤能力增强。沙漏状孔隙的起始位置可以通过调节湿空气浴时间来精细调节，从而实现对孔径和透水性的显著控制。在嵌段共聚物中加入PEG，再加上浇铸液的低粘度，在V-NIPS过程中加速了吸水，改善了与水的相容性，促进了高效的气相分离（VIPS），形成了更松散、高渗透的结构。在10 s的空气浴条件下，PES-b-PEG膜的水通量为45712 L m−2 h−1 bar−1，孔径为0.8 μm，对1.0 μm聚苯乙烯微球的截留率为99.5%，过滤容量为1233 L m−2（通量下降10%）。这项研究强调了PES-b-PEG嵌段共聚物在通过超短潮湿空气暴露生产具有可定制沙漏状结构的高性能MF膜方面的优势。

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引用次数: 0

Optimizing Mg2+/Li+ selectivity of nanofiltration membrane: synergistically modification on steric and Donnan exclusion 纳滤膜Mg2+/Li+选择性优化：空间位阻和Donnan阻的协同修饰

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-01 DOI: 10.1016/j.memsci.2025.125115

Youran Xu , Rukang Tian , Hao Zhang, Xiaowen Wu, Yunkun Wang

The transition to renewable energy and the pursuit of carbon neutrality have heightened the demand for lithium extraction from salt lake brines to ensure a sufficient lithium supply. Nanofiltration (NF) membranes offer an efficient method for solute sieving; however, achieving highly selective Mg²⁺/Li⁺ separation remains challenging due to their similar hydration radii. This study introduces a synergistic modification strategy to adjust the surface physicochemical properties of NF membranes through incorporation of a sodium alginate interlayer and post-treatment with piperazine. The resulting modifications improved Mg²⁺ selectivity by optimizing steric and Donnan exclusion mechanisms, achieved through a refined pore size distribution and reduced surface negative potential. Consequently, the modified membrane exhibited an outstanding Mg/Li selectivity factor (>100), with Mg²⁺ rejection efficiency exceeding 98 %. The membrane also demonstrated stable performance under mixed feed conditions with high total dissolved solids (TDS, 2000 ppm) and low Li⁺ concentration (100 MgCl₂/LiCl mass ratio). This study provides a facile and effective approach to enhance multiple exclusion mechanisms for Mg²⁺ separation, offering valuable insights into the design and fabrication of advanced NF membranes for efficient Mg/Li separation.

向可再生能源的过渡和对碳中和的追求提高了从盐湖盐水中提取锂的需求，以确保充足的锂供应。纳滤（NF）膜为溶质筛分提供了一种有效的方法；然而，由于它们的水合半径相似，实现高选择性的Mg2+/Li+分离仍然具有挑战性。本研究介绍了一种协同改性策略，通过加入海藻酸钠中间层和哌嗪后处理来调节纳滤膜的表面物理化学性质。所得到的修饰通过优化空间和Donnan排斥机制提高了Mg2+的选择性，通过优化孔径分布和降低表面负电位来实现。结果表明，改性膜具有优异的Mg/Li选择性因子（>100），对Mg2+的去除率超过98%。在高总溶解固体（TDS, 2000 ppm）和低Li+浓度（100 MgCl2/LiCl质量比）的混合进料条件下，膜也表现出稳定的性能。该研究提供了一种简单有效的方法来增强Mg2+分离的多种排斥机制，为设计和制造高效分离Mg/Li的高级NF膜提供了有价值的见解。

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引用次数: 0