Journal of Membrane Science最新文献_第9页

Fabrication of high-performance thin film composite nanofiltration membrane with zwitterionic copolymer as an aqueous additive 以两性离子共聚物为水添加剂制备高性能薄膜复合纳滤膜

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2025-12-03 DOI: 10.1016/j.memsci.2025.125017

Wentian Zhang , Huan Xu , Lichao Xia , Shanshan Zhao

Thin film composite nanofiltration (NF) membranes have a wide range of applications in drinking water production and industrial wastewater treatment. However, their performance is constrained by the inherent trade-off between permeability and selectivity, which can be effectively alleviated by regulating interfacial polymerization (IP). In this study, a zwitterionic copolymer (ZPSA), synthesized via one-step free radical polymerization using sulfobetaine ([2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide) and allylamine hydrochloride monomers, was utilized as an aqueous additive to regulate the IP processes for the fabrication of high-performance NF membranes. Adding zwitterionic copolymer retarded the diffusion rate of piperazine monomers due to electrostatic interaction and steric hindrance, resulting in an ultra-thin and relatively loose polyamide selective layer with enhanced surface hydrophilicity. Notably, incorporating zwitterionic copolymer significantly improved water permeability and maintained high rejection of divalent anions. The optimized membrane (i.e., ZPSA-1.5) achieved a water permeability around 18.8 L m⁻² h⁻¹ bar⁻¹, which was threefold higher than that of the control membrane, along with 98.0 % Na₂SO₄ rejection. Additionally, the X-ray photoelectron spectroscopy results suggest that the added hydrophilic ZPSA could hinder PIP diffusion rate and decrease its reaction rate at interface, which was further confirmed by molecular simulation. The ZPSA-regulated membrane enhanced water permeability while preserving salt rejection, demonstrating its potential for nanofiltration applications.

薄膜复合纳滤膜在饮用水生产和工业废水处理中有着广泛的应用。然而，它们的性能受到渗透性和选择性之间的内在权衡的限制，可以通过调节界面聚合（IP）来有效缓解。在本研究中，以亚砜甜菜碱([2-（甲基丙烯氧基）乙基]二甲基-（3-磺基丙基）氢氧化铵和盐酸烯丙胺为单体，通过一步自由基聚合法制备了两性离子共聚物（ZPSA），并将其作为水相添加剂来调控制备高性能纳滤膜的IP工艺。两性离子共聚物的加入由于静电相互作用和位阻作用，延缓了哌嗪单体的扩散速率，形成了超薄、相对松散的聚酰胺选择层，表面亲水性增强。值得注意的是，加入两性离子共聚物显著提高了水的渗透性，并保持了对二价阴离子的高截留。优化膜（即ZPSA-1.5）的透水性约为18.8 L m−2 h−1 bar−1，是对照膜的3倍，Na2SO4的截留率为98.0%。此外，x射线光电子能谱结果表明，加入亲水性ZPSA会阻碍PIP的扩散速率，降低其在界面处的反应速率，分子模拟进一步证实了这一点。zpsa调节的膜增强了水的渗透性，同时保留了盐的排斥，证明了其在纳滤应用中的潜力。

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引用次数: 0

Synergistic control of tar and particulate matter in steam gasification of six typical biowastes using a catalyst-integrated SiC membrane reactor 催化集成SiC膜反应器协同控制六种典型生物垃圾蒸汽气化过程中的焦油和颗粒物

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2025-12-27 DOI: 10.1016/j.memsci.2025.125093

Ajing Ding , Xing Fang , Jiaming Fei , Jingtao You , Quanhui Zhou , Fanghua Li , Yuting Zhang , Xuerui Wang , Lian Zhang , Qiaoqiao Zhou , Xuehong Gu

Clean syngas is valuable for fuel cells and high-value fuels/chemical synthesis; however, tar and particulate matter (PM) in syngas hinder its utilization. This study systematically investigated the steam gasification of six typical biowastes (covering agricultural, forestry, and aquatic categories) in an activated biochar catalyst-integrated SiC membrane reactor at 800 °C, focusing on the tar and PM formation and control mechanism. In control tests (without membrane, catalyst or steam), microalgae (MA) had the highest syngas tar content (395.6 g/m³), while herb residue (HR) showed the lowest (82.9 g/m³). MA also had the highest PM content (9.1 g/m³), followed by walnut shell (WS, 7.0 g/m³), whereas corncob (CC) and poplar wood (PW) had the lowest (1.2–1.4 g/m³), with PM content dependent more on coke from volatile polymerization than feedstock ash. In the catalyst-integrated membrane reactor, steam gasification of biowastes achieved tar conversion efficiencies of 88 %–96 % and PM removal efficiencies of 94 %–99 % across all biowastes, with excellent stability over 400 min. This performance should be attributed to the synergies among the three core components: the SiC membrane retained coarse PM to protect catalyst active sites; steam suppressed carbon deposition on both membrane and catalyst via coke reforming; and the biochar catalyst promoted tar cracking/reforming, followed by steam and then the membrane. These findings highlight the unique complementary roles of the integrated system, emphasizing the need to tailor gasification processes to biowaste characteristics for efficient clean syngas production.

清洁合成气对燃料电池和高价值燃料/化学合成有价值；然而，合成气中的焦油和颗粒物（PM）阻碍了其利用。本研究系统研究了6种典型生物垃圾（涵盖农业、林业和水产类）在活性生物炭催化剂集成SiC膜反应器中800℃下的蒸汽气化过程，重点研究了焦油和PM的形成及控制机制。对照试验（无膜、无催化剂、无蒸汽）中，微藻（MA）的合成气焦油含量最高（395.6 g/m3），中草药渣（HR）的合成气焦油含量最低（82.9 g/m3）。MA的PM含量也最高（9.1 g/m3），其次是核桃壳（WS, 7.0 g/m3），玉米芯（CC）和杨木（PW）的PM含量最低（1.2-1.4 g/m3）， PM含量更多地取决于挥发性聚合产生的焦炭，而不是原料灰分。在催化剂集成膜反应器中，所有生物垃圾的蒸汽气化焦油转化率为88% - 96%，PM去除率为94% - 99%，并且在400 min内具有出色的稳定性。这种性能应归功于三个核心组分之间的协同作用：SiC膜保留了粗PM以保护催化剂的活性位点；水蒸气通过焦炭重整抑制膜和催化剂上的积碳；生物炭催化剂促进焦油裂解/重整，然后是蒸汽，最后是膜。这些发现突出了集成系统的独特互补作用，强调了根据生物废物特性定制气化工艺以实现高效清洁合成气生产的必要性。

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引用次数: 0

“Fingerprint” of polymer for gas transport characteristics on the example of novel CO2-selective polynorbornene bearing highly polar side substituents 以含高极性侧取代基的新型co2选择性聚降冰片烯为例，聚合物气体输运特征的“指纹图谱”

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2026-01-12 DOI: 10.1016/j.memsci.2026.125152

Diana A. Sadykova, Dmitry A. Alentiev, Dmitry A. Tsarev, Roman Yu. Nikiforov, Victoria E. Ryzhikh, Nikolay A. Belov, Alexander Yu. Alentiev, Maxim V. Bermeshev, Anton L. Maximov

High-molecular-weight metathesis polynorbornene containing triethylene glycol fragments linked to the main chain through a carboxyl group has been synthesized for the first time. Gas-transport parameters of the polynorbornene were investigated for the extended set of gases: H₂, He, Ar, N₂, O₂, CO₂, CH₄, C₂H₂, C₂H₄, C₂H₆, C₃H₆, C₃H₈, CHF₃, CH₂F₂, CF₂Cl₂, CHF₂Cl, and NH₃. The gas-transport properties of the polymer are stable during six months. The increased permeability coefficients of CO₂, ethylene, acetylene, propylene, freons and ammonia are determined by their high solubility coefficients. The point for the polymer synthesized in the work is located higher than the 2008 Robeson upper bound in the selectivity-permeability diagram for CO₂/N₂ gas pair, which arises from the specific interaction of CO₂ with the polymer. The analysis of specific interactions was carried out using correlation ratios of diffusion coefficients with the effective cross-section of gas molecules and solubility coefficients with Abraham parameters. Nonspecific and specific solubility and diffusion coefficients and their ratios for CO₂, acetylene, ethylene, propylene, freons and ammonia were obtained. Based on the data obtained, the Abraham coefficients for the synthesized polymer (the “fingerprint” of the polymer) are calculated, which make it possible to estimate the solubility coefficient of gas or vapor for which the Abraham parameters are tabulated. The diffusion coefficients of gas or vapor for which the values of the effective cross-section of the molecule are tabulated can be estimated using the Teplyakov-Meares model, and, consequently, the permeability coefficient can be calculated. The proposed model has significant potential, however, given that the values obtained are calculated, the predicted gas transport parameters of the polymer are estimates.

首次合成了含有三甘醇片段通过羧基与主链连接的高分子量甲基化聚降冰片烯。研究了聚降冰片烯在H2、He、Ar、N2、O2、CO2、CH4、C2H2、C2H4、C2H6、C3H6、C3H8、CHF3、CH2F2、CF2Cl2、CHF2Cl和NH3等气体下的输运参数。聚合物的气体输运性能在六个月内保持稳定。二氧化碳、乙烯、乙炔、丙烯、氟利昂和氨的渗透性系数增加是由它们的高溶解度系数决定的。在CO2/N2气体对的选择性-渗透率图中，合成的聚合物的点位于2008年的罗伯逊上界之上，这是由于CO2与聚合物的特定相互作用造成的。利用扩散系数与气体分子有效截面的相关比、溶解度系数与亚伯拉罕参数的相关比分析了具体的相互作用。得到了CO2、乙炔、乙烯、丙烯、氟利昂和氨的非特异性和特异性溶解度和扩散系数及其比值。根据获得的数据，计算了合成聚合物的亚伯拉罕系数（聚合物的“指纹”），从而可以估计出亚伯拉罕参数表所示的气体或蒸汽的溶解度系数。用Teplyakov-Meares模型可以估计出分子有效截面值的气体或蒸汽的扩散系数，从而可以计算出渗透系数。所提出的模型具有很大的潜力，然而，考虑到计算得到的值，预测的聚合物气体输运参数是估计的。

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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 : 2026-03-01 Epub 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

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 : 2026-03-01 Epub 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

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 : 2026-03-01 Epub 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

Ultra-selective CANAL polymers for hydrogen-based membrane separations after long-term aging 长期老化后用于氢基膜分离的超选择性CANAL聚合物

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.memsci.2025.125038

Jing Ying Yeo , Brandon C. Tapia , Francesco M. Benedetti , Ashley M. Robinson , Julian Richardson , Benjamin J. Pedretti , Tae Hoon Lee , Benny D. Freeman , Yan Xia , Zachary P. Smith

Hydrogen is a critically important molecule in the chemicals and energy industries, driving the need for efficient purification technologies such as membrane-based separations. However, polymer membranes often suffer from physical aging, leading to decreased gas permeability over time. This study leverages the unique aging behavior of contorted microporous polymers, synthesized via catalytic arene-norbornene annulation (CANAL) polymerization, to enhance molecular sieving for H₂ separations. While prior studies demonstrated a 1000 % increase in H₂/CH₄ selectivity with minimal H₂ permeability loss over 150 days, we extend this investigation to hyperaged (∼1 year) CANAL polymers and evaluate their performance under various conditions of industrial relevance. We report a remarkable 6100 % increase in H₂/CH₄ selectivity and a 2400 % improvement in H₂/N₂ selectivity, with only a 55 % decline in H₂ permeability. These membranes exhibit excellent long-term stability in binary and ternary gas mixtures and at elevated temperatures. Additionally, extended aging enhances H₂/CO₂ selectivity beyond the 2008 upper bound due to improved size-sieving. High-temperature permeation experiments and grand canonical Monte Carlo simulations reveal that H₂ permeability increases from 570 to 3500 barrer as the temperature rises from 35 °C to 190 °C, while H₂/CO₂ selectivity declines from 14 to 3 due to the higher diffusion activation energy of CO₂. Despite this tradeoff, hyperaged CANAL membranes maintain performance beyond the 200 °C upper bound, having selectivity–permeability performance comparable to many state-of-the-art membranes for H₂/CO₂ separations. This study highlights the robustness and industrial viability of ultra-selective CANAL polymers for hydrogen purification, contributing to advancements in clean energy and sustainable separation technologies.

氢在化学和能源工业中是一种至关重要的分子，推动了对高效净化技术的需求，如膜基分离。然而，聚合物膜经常遭受物理老化，导致气体渗透性随着时间的推移而降低。本研究利用通过催化芳烃-降冰片烯环化（CANAL）聚合合成的扭曲微孔聚合物的独特老化行为，来增强H2分离的分子筛分。虽然先前的研究表明，在150天内H2/CH4选择性增加1000%，H2渗透率损失最小，但我们将研究扩展到超老化（~ 1年）的CANAL聚合物，并评估其在各种工业相关条件下的性能。我们报告了H2/CH4选择性提高了6100%，H2/N2选择性提高了2400 %，而H2渗透率仅下降了55%。这些膜在二元和三元气体混合物和高温下表现出优异的长期稳定性。此外，由于改进了粒度筛选，延长时效使H2/CO2选择性超过了2008年的上限。高温渗透实验和大规范蒙特卡罗模拟结果表明，随着温度从35℃升高到190℃，H2的渗透率从570巴升高到3500巴，而H2/CO2选择性从14巴下降到3巴，这是由于CO2的扩散活化能较高。尽管存在这种权衡，超老化的CANAL膜在超过200°C的上限下仍能保持性能，具有可与许多最先进的H2/CO2分离膜相媲美的选择性-渗透性性能。这项研究强调了超选择性CANAL聚合物用于氢气净化的稳健性和工业可行性，有助于清洁能源和可持续分离技术的进步。

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引用次数: 0

Long-term stability and mixed-salt effect of MXene/vermiculite membranes for ion separation MXene/蛭石离子分离膜的长期稳定性及混盐效应

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.memsci.2025.125041

Teng-Xuan Cao , Wangwang Ji , Yumei Tan , Hao-Cheng Li , Yi-Lu Zhang , Bin Wang , Zifeng Lin , Rui Xie , Xiao-Jie Ju , Wei Wang , Da-Wei Pan , Zhuang Liu , Liang-Yin Chu

MXene materials have demonstrated great potential for separation applications; however, their intrinsic instability severely limits their practical use. In this work, vermiculite nanosheets are uniformly incorporated into MXene membranes to enhance their long-term stability. This improvement is likely due to the negatively charged environment created by the vermiculite nanosheets, which weakens the polarization of C–Ti bonds in MXene and suppresses its oxidation. Stability tests reveal that MXene remains stable within the MXene/vermiculite membranes after heating at 200 °C in air for 2 h. In contrast, a pure MXene membrane is oxidized under the same conditions. In ion diffusion experiments, the membranes maintain stable transport of monovalent ions such as Cs⁺ for more than ∼1000 h. The MX-60 % membrane exhibits the best separation performance, achieving ideal selectivity ratios of ∼27.8 for Li⁺/Cs⁺ and ∼39.5 for Li⁺/Mg²⁺. However, in mixed-ion systems, the separation behavior changes markedly—the Cs⁺/Li⁺ separation factor reverses to ∼5.2, indicating that Cs⁺ diffuses faster than Li⁺. This unexpected mixed-salt effect is attributed to ion-ion interactions that disrupt the ordered interlayer water structure, thereby influencing ion transport within the membrane channels. Overall, this work provides an effective strategy to enhance the stability of MXene-based membranes and reveals a notable mixed-ion effect that impacts the ion separation performance of MXene/vermiculite membranes.

MXene材料在分离应用方面显示出巨大的潜力；然而，它们内在的不稳定性严重限制了它们的实际应用。在这项工作中，蛭石纳米片均匀地掺入MXene膜中，以提高其长期稳定性。这种改进可能是由于蛭石纳米片产生的负电荷环境，它削弱了MXene中C-Ti键的极化并抑制了其氧化。稳定性测试表明，在空气中200℃加热2小时后，MXene在MXene/蛭石膜内保持稳定。相比之下，纯MXene膜在相同条件下被氧化。在离子扩散实验中，mx - 60%膜能保持Cs+等一价离子的稳定传输超过1000小时。mx - 60%膜表现出最佳的分离性能，Li+/Cs+的理想选择性比为~ 27.8，Li+/Mg2+的理想选择性比为~ 39.5。然而，在混合离子体系中，分离行为发生了显著变化——Cs+/Li+分离因子逆转到~ 5.2，表明Cs+的扩散速度快于Li+。这种意想不到的混合盐效应归因于离子-离子相互作用，破坏了有序的层间水结构，从而影响了膜通道内的离子运输。综上所述，本研究为提高MXene基膜的稳定性提供了一种有效的策略，并揭示了影响MXene/蛭石膜离子分离性能的显著混合离子效应。

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引用次数: 0

Using quercetin to anchor a novel Ce-doped acid to enhance the performance and chemical stability of proton exchange membranes 槲皮素锚定新型ce掺杂酸提高质子交换膜的性能和化学稳定性

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2026-01-12 DOI: 10.1016/j.memsci.2026.125155

Zhongrui Lu, Zhuoran Yang, Xiaohang Li, Zhengwei Chang, Xiaoyang Jia, Shaojian He , Jun Lin

Cerium compounds are extensively utilized to enhance the chemical stability of proton exchange membranes (PEMs) due to their efficient scavenging of free radicals; however, cerium ions can reduce the proton conductivity of PEMs and can migrate out of PEMs. In this work, we synthesized a novel compound, cerium phosphotungstate (CeHPW), which effectively reduces the solubility of Ce ions while simultaneously enhancing the proton conductivity of PEMs. Moreover, quercetin was employed to anchor Ce ions further, thereby obtaining water-insoluble QCeHPW. QCeHPW exhibits superior free radical scavenging ability compared to either CeO₂ or quercetin alone. Furthermore, the proton conductivity of sulfonated poly(ether ether ketone) (SPEEK) composite membrane containing 7.5 wt% QCeHPW in liquid water at 25 °C was 0.052 S cm⁻¹, which represents a 53 % improvement over the SPEEK control membrane (0.034 S cm⁻¹). The single-cell performance of this membrane is significantly better than that of SPEEK control membrane. In addition, compared to SPEEK membranes doped with quercetin or CeO₂, the decay rate of the open-circuit voltage (OCV) for this membrane is lower.

铈化合物由于能有效清除自由基而被广泛用于提高质子交换膜的化学稳定性；然而，铈离子会降低PEMs的质子电导率，并会向外迁移。在这项工作中，我们合成了一种新的化合物，磷钨酸铈（CeHPW），它有效地降低了Ce离子的溶解度，同时提高了PEMs的质子电导率。此外，槲皮素进一步锚定Ce离子，得到不溶于水的QCeHPW。与单独使用CeO2或槲皮素相比，QCeHPW具有更强的自由基清除能力。此外，含有7.5 wt% QCeHPW的磺化聚醚醚酮（SPEEK）复合膜在25°C的液态水中的质子电导率为0.052 S cm - 1，比SPEEK对照膜（0.034 S cm - 1）提高了53%。该膜的单细胞性能明显优于SPEEK对照膜。此外，与槲皮素或CeO2掺杂的SPEEK膜相比，该膜的开路电压（OCV）衰减率更低。

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引用次数: 0

A reduced order model for spatially resolved gas transfer prediction in full scale oxygenators 全尺寸氧合器中空间分辨气体传递预测的降阶模型

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-03-01 Epub Date: 2026-01-11 DOI: 10.1016/j.memsci.2025.125096

Jannis M. Focke , Kai P. Barbian , Paul-Luca Bonke , Ulrich Steinseifer , Jutta Arens , Michael Neidlin

Severe lung diseases can be clinically treated with extracorporeal blood oxygenation (ECMO), where blood oxygenators exchange gases across thousands of hollow fiber membranes. However, their large surface area increases blood trauma and the risk of device failure. Understanding and improving gas transfer efficiency through computational models can help to reduce the required membrane surface area for the design of smaller and safer oxygenators. However, existing models either oversimplify local flow and gas exchange or rely on experimental calibration.

To address this gap, we developed a reduced order model (ROM) that predicts oxygen transfer in fiber bundles modeled as porous media, without requiring a priori experiments. The model provides locally resolved oxygen source terms that account for fiber configuration, Reynolds number, and oxygen concentration, and were derived from and fitted to data from in-vitro validated fiber-scale computational fluid dynamics (CFD) simulations (RMSE <0.01). The ROM predicted oxygen transfer of the validated simulations with high accuracy (R-squared = 0.995) and an overestimation of 6 %. When applied to a lab-scale oxygenator, the ROM accurately predicted total oxygen transfer with a relative error of 2.3 % compared to experimental results and provided spatially resolved oxygen concentration distributions within the fiber bundle.

We provide source term functions and coefficients for the four most common fiber configurations and a CFD implementation in a full-scale oxygenator for further use.

严重的肺部疾病可以通过体外血液氧合（ECMO）进行临床治疗，血液氧合器通过数千个中空纤维膜交换气体。然而，它们的大表面积增加了血液创伤和设备故障的风险。通过计算模型了解和提高气体传递效率有助于减少所需的膜表面积，从而设计更小、更安全的氧合器。然而，现有的模型要么过于简化了局部流动和气体交换，要么依赖于实验校准。为了解决这一问题，我们开发了一种降阶模型（ROM），该模型可以预测作为多孔介质模型的纤维束中的氧转移，而无需先验实验。该模型提供了局部解析的氧源项，用于解释纤维结构、雷诺数和氧浓度，并推导并拟合了体外验证的纤维尺度计算流体动力学（CFD）模拟的数据（RMSE <0.01）。ROM对验证模拟的氧转移预测精度较高（r²= 0.995），高估6%。当应用于实验室规模的氧合器时，ROM准确地预测了总氧转移，与实验结果相比，相对误差为2.3%，并提供了光纤束内空间分解的氧浓度分布。我们为四种最常见的纤维配置提供了源项函数和系数，并在全尺寸氧合器中实现了CFD，以供进一步使用。

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引用次数: 0