Journal of Membrane Science最新文献_第2页

Role of frictional forces in salt and water transport through polyamide reverse osmosis membranes 聚酰胺反渗透膜在盐和水运输中的摩擦力作用

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-24 DOI: 10.1016/j.memsci.2026.125202

Kevin E. Pataroque , Subhamoy Mahajan , Jonathan Mejia , Martina del Cerro , Jishan Wu , Hanqing Fan , Ying Li , Eric M.V. Hoek , Menachem Elimelech

Understanding transport mechanisms in thin-film composite membranes is critical for advancing membrane technology. While the solution-friction model, or more appropriately, the sorption-friction (SF) model, can describe water and salt transport behavior, the contribution of frictional forces towards salt–water selectivity in different membranes has not been explored. In this study, we establish relationships between intrinsic membrane properties and transport parameters based on the SF model, using permeation experiments and molecular dynamics (MD) simulations. Pore sizes of various commercial thin-film composite membranes are quantified by measuring the rejection of neutral organic solutes. Salt partitioning is measured using quartz crystal microbalance, while salt permeance is determined in a stirred dead-end cell. Our results show that as pore size increased from 0.6 to 0.7 nm, salt partitioning increased by 21.2 %, while salt permeance increased more than tenfold. These results suggest that transport within the membrane, rather than salt partitioning at the membrane surface, is more sensitive to changes in membrane structure. Using the SF model, we show that ion-membrane and water-membrane interactions decrease with larger pore sizes, which may explain the observed differences in salt and water permeances. These findings are supported by MD simulations used to determine ion and water self-diffusion coefficients in five distinct membranes. Through these simulations, we confirmed that water and ion mobilities are greater in membranes with larger pores due to weaker frictional interactions between these species and the membrane. This study demonstrates how frictional forces are related to membrane pore size and can be effectively used to model salt and water transport through the membrane.

了解薄膜复合膜的传输机制对于推进膜技术的发展至关重要。虽然溶液-摩擦模型，或者更确切地说，吸附-摩擦（SF）模型可以描述水和盐的传输行为，但摩擦力对不同膜中盐水选择性的贡献尚未得到探讨。在这项研究中，我们利用渗透实验和分子动力学（MD）模拟，建立了基于SF模型的膜固有特性和运输参数之间的关系。通过测量中性有机溶质的截留量来定量各种商用薄膜复合膜的孔径。盐的分配是用石英晶体微天平测量的，而盐的渗透是在一个搅拌的终端细胞中测定的。结果表明，随着孔隙大小从0.6 nm增加到0.7 nm，盐分配增加了21.2%，而盐渗透增加了10倍以上。这些结果表明，与盐在膜表面的分配相比，膜内的转运对膜结构的变化更为敏感。利用SF模型，我们发现离子膜和水膜的相互作用随着孔径的增大而减小，这可以解释观察到的盐渗透率和水渗透率的差异。这些发现得到了用于确定离子和水在五种不同膜中的自扩散系数的MD模拟的支持。通过这些模拟，我们证实，由于这些物种与膜之间的摩擦相互作用较弱，水和离子在孔隙较大的膜中的流动性更大。这项研究证明了摩擦力是如何与膜孔径相关的，并且可以有效地用于模拟盐和水通过膜的运输。

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引用次数: 0

Structurally engineered graphene oxide (GO) based membranes with “bidirectional-transport” channels for high salinity wastewater desalination via pervaporation 结构工程氧化石墨烯（GO）基膜，具有“双向传输”通道，用于通过渗透蒸发脱盐高盐度废水

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-24 DOI: 10.1016/j.memsci.2026.125206

Lei Jiang , Tingting Luo , Bouchra Belaissaoui , Andres Piña Martinez , Shushan Yuan , Daliang Xu , Tianze Hu , Yue Wang , Xin Xiao , Riri Liu , Alexander Volodine , Bart Van der Bruggen , Pengrui Jin

High-salinity wastewater (salinity >1.0 wt%) originating from fine chemicals and waste secondary battery recycling presents a significant treatment demand, and efficient membrane concentration technology is considered one of the most promising approaches to address issue. However, traditional two-dimensional (2D) layered membranes, limited by dense interlayer lateral channels, struggle to simultaneously achieve high flux and high selectivity under high-salinity conditions, and the restricted vertical transport path further severely hinders overall flux. Here, we construct a membrane structure that integrates both lateral and vertical transport paths, providing a general strategy to overcome the inherent trade-off between flux and selectivity in membrane separation. We proposed ethylenediamine (EDA) bridged nanoporous graphene oxide (GO) membrane (E-NP) constructs a mass transfer channel with "bidirectional transport" characteristics. Specifically, to accelerate vertical mass transfer, GO nanosheets were first etched to introduce nanopores of approximately 10 nm in sheets, while simultaneously reducing their lateral size by about 45 %. Subsequently, EDA was covalently grafted onto adjacent porous nanosheets, expanding the lateral transport channels and introducing hydrophilic amide sites, while also facilitating the adsorption and diffusion of water molecules. The ultrathin E-NP membrane prepared by vacuum-assisted filtration had a thickness of approximately 100 nm and achieved high water fluxes of 39.7 and 89.5 kg m⁻² h⁻¹ at 40 °C and 70 °C, respectively, while maintaining a desalination rate of approximately 99.80 % even with a feed salinity as high as 14.0 wt%. This is owning to the synergistic acceleration effect between the vertically aligned nanopores and the EDA mediated lateral channels rich in water binding sites, the flux of the E-NP membrane was increased by 149.7 % compared to the original GO membrane.

来自精细化学品和废旧二次电池回收的高盐度废水（盐度>；1.0 wt%）提出了巨大的处理需求，而高效膜浓缩技术被认为是解决这一问题的最有前途的方法之一。然而，传统的二维（2D）层状膜受到致密的层间横向通道的限制，难以在高盐度条件下同时实现高通量和高选择性，并且受限制的垂直传输路径进一步严重阻碍了总体通量。在这里，我们构建了一个整合横向和垂直传输路径的膜结构，提供了一种克服膜分离中通量和选择性之间固有权衡的一般策略。我们提出乙二胺（EDA）桥接纳米多孔氧化石墨烯（GO）膜（E-NP）构建具有“双向传输”特性的传质通道。具体来说，为了加速垂直传质，首先蚀刻氧化石墨烯纳米片，在片上引入约10纳米的纳米孔，同时将其横向尺寸减小约45%。随后，EDA被共价接枝到邻近的多孔纳米片上，扩大了横向运输通道，引入了亲水性酰胺位点，同时也促进了水分子的吸附和扩散。真空辅助过滤制备的超薄E-NP膜厚度约为100 nm，在40°C和70°C下分别实现了39.7和89.5 kg m−2 h−1的高水通量，即使饲料盐度高达14.0 wt%，也能保持约99.80%的脱盐率。这是由于垂直排列的纳米孔与EDA介导的富含水结合位点的侧通道之间的协同加速效应，E-NP膜的通量比原氧化石墨烯膜增加了149.7%。

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引用次数: 0

Reinforcing ion-cluster connectivity via hyperbranched phosphonium units for high-performance and durable AEMWE membranes 通过超支化磷单元增强离子簇连通性，用于高性能和耐用的AEMWE膜

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-24 DOI: 10.1016/j.memsci.2026.125203

Wooseok Lee , Soomin Jeon , Youngjin Seo , Kyungwhan Min , Hyeonjun Maeng , Jungmin Kim , Chihoon Park , Tae-Hyun Kim

Anion exchange membrane water electrolysis (AEMWE) technology has been actively researched for the production of green hydrogen as a next-generation clean energy source, with a primary focus on developing high-performance anion-exchange membranes (AEMs). However, the relatively low ionic conductivity and alkaline stability of AEMs can compromise both the performance and durability of AEMWE systems. Recent studies have reported the introduction of branched structures to enhance microphase separation, thereby improving the ionic conductivity and stability of AEMs. In this study, hyperbranched triphenylphosphine units were incorporated into linear poly (para-terphenyl piperidinium) (QPpTP), and the central phosphorus atom was functionalized into phosphonium (P⁺), yielding branched polymers with an ion-conducting group as the branched unit (b-QPm-QPpTP, m = 5, 7.5, 10). Triphenylphosphonium introduction enabled strong P⁺-OH^- interactions, simultaneously achieving high water uptake, low swelling ratio, and excellent dimensional stability. Notably, b-QP5-QPpTP exhibited enhanced ion-cluster connectivity and a high OH⁻ conductivity of 155.76 mS cm⁻¹ at 80 °C. It also demonstrated outstanding water electrolysis performance of 6.98 A cm⁻² at 2.0 V, as well as excellent long-term durability with a negligible voltage increase of 0.54 mV h⁻¹ over 250 h, confirming its potential as a high-performance branched AEM material for next-generation AEMWE applications.

作为下一代清洁能源，阴离子交换膜电解（AEMWE）技术在绿色氢生产方面得到了积极的研究，其重点是开发高性能阴离子交换膜（AEMs）。然而，AEMs相对较低的离子电导率和碱性稳定性会影响AEMWE系统的性能和耐久性。最近的研究报道了引入分支结构来增强微相分离，从而提高离子电导率和AEMs的稳定性。本研究将超支化的三苯基膦单元并入线性聚对terphenyl胡椒啶（QPpTP）中，中心磷原子被功能化成磷（P+），得到以离子导电基团为支链单元的支链聚合物（b-QPm-QPpTP, m = 5,7.5, 10）。三苯基磷的引入使P+- oh -相互作用强，同时具有高吸水率、低溶胀率和优异的尺寸稳定性。值得注意的是，b-QP5-QPpTP在80°C时表现出增强的离子簇连通性和155.76 mS cm−1的高OH -电导率。此外，该材料在2.0 V电压下的电解性能为6.98 A cm - 2，在250小时内电压仅增加0.54 mV h- 1，具有优异的长期耐用性，证实了其作为下一代AEMWE应用的高性能分支AEM材料的潜力。

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引用次数: 0

An integrated module with synergistic heating and turbulence promotion for enhanced vacuum membrane distillation 一个集成的模块与增强型真空膜蒸馏的协同加热和湍流促进

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-23 DOI: 10.1016/j.memsci.2026.125204

Fangli Zhang , Chenyang Gu , Yangming Cheng , Rizhi Chen , Zhaohui Wang , Zhaoliang Cui

Conventional membrane distillation (MD) experiences 50–80 % flux reduction due to temperature polarization (TP), while metallic heat exchangers are susceptible to corrosion when treating high-salinity feeds. To address these limitations, an integrated heat-exchange vacuum membrane distillation (IHEVMD) module was developed by incorporating polymer-based heat-exchange tubes within the MD process, enabling simultaneous in-situ feed heating and distillation. Heat transfer performance and MD flux were thoroughly examined in relation to heat-exchange temperature, heat-exchange area, feed, and heat-exchange fluid flow rates. Results demonstrate that the total heat transfer rate (Q) and overall heat transfer coefficient (K) are governed by the heat-exchange temperature and feed flow rate. The flux in MD was favorably influenced by the temperature and membrane area. The IHEVMD module D achieved an 83 % flux enhancement at 56 °C compared to conventional MD, along with a 90 % improvement in gained output ratio (GOR) and a 50 % reduction in specific thermal energy consumption (STEC). Notably, the module exhibited superior performance with high-salinity feeds (e.g., 3.5 and 5 wt% NaCl), leveraging brine's lower specific heat capacity for higher feed temperatures and fluxes. Long-term stability tests confirmed effective TP mitigation and anti-fouling properties. This work provides an energy-efficient, corrosion-resistant strategy for high-salinity water treatment utilizing low-grade heat sources.

由于温度极化（TP），传统的膜蒸馏（MD）会使通量降低50 - 80%，而金属热交换器在处理高盐度进料时容易受到腐蚀。为了解决这些限制，开发了集成热交换真空膜蒸馏（IHEVMD）模块，该模块在MD过程中集成了基于聚合物的热交换管，可以同时进行原位进料加热和蒸馏。传热性能和MD通量与换热温度、换热面积、进料和换热流体流速的关系进行了全面的研究。结果表明，总换热率Q和总换热系数K受换热温度和进料流量的影响。MD的通量受温度和膜面积的影响较大。与传统MD相比，IHEVMD模块D在56°C时实现了83%的通量增强，同时获得的输出比（GOR）提高了90%，比热能耗（STEC）降低了50%。值得注意的是，该模块在高盐度进料（例如，3.5 wt%和5 wt% NaCl）中表现出优异的性能，利用盐水较低的比热容来提高进料温度和通量。长期稳定性测试证实了有效的TP缓解和防污性能。这项工作为利用低品位热源进行高盐度水处理提供了一种节能、耐腐蚀的策略。

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引用次数: 0

Aggregation assisted synergism for the extraction of Am(III) by a polymer inclusion membrane containing mixed ligands: Extraction, spectroscopic and small-angle X-ray scattering study 混合配体聚合物包合膜对Am（III）的聚集协同萃取：萃取、光谱和小角x射线散射研究

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-23 DOI: 10.1016/j.memsci.2026.125205

Soumitra Panda , Bholanath Mahanty , Debasis Sen , Satish Mandal , Pramilla D. Sawant , Arunasis Bhattacharyya

Generally, aggregation and synergism are common phenomenon in solvent extraction process when two amphiphilic extractants, one acidic and another neutral were employed for the metal ion extraction. Again, aggregation may drive the synergistic extraction of metal ions in a multi extractant system. However, to the best of our knowledge, the correlation between aggregation and synergism is unexplored in a more complex system like mixed extractant based polymeric plasticized membrane. Herein, we observed synergistic extraction of Am(III) from a dilute nitric acid solution (0.01–2 M) with a nitrophenyl octyl ether (NPOE) plasticized cellulose triacetate (CTA) based polymer inclusion membrane (PIM) containing an acidic extractant, di(2-ethylhexyl)phosphoric acid (D2EHPA) and a neutral extractant, N,N,N′,N′-tetraoctyldiglycolamide (TODGA). The Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL), small angle X‐ray scattering (SAXS) and extraction studies indicate the involvement of both the ligand in the extraction of Eu(III) (considered as surrogate of Am(III)) and the evidence of aggregate formation in the structure of membrane. A possible mechanism was given to explain how aggregation synergistically assists in the extraction of metal ion based on the results from the SAXS studies. The self diffusion coefficients of Eu(III) was determined by non-stationary radiotracer diffusion method which nicely correlate with the size of the aggregate from SAXS studies of the membranes. The mixed membrane with a composition of D2EHPA and TODGA in the mole ratio of 2:1 follows the Langmuir isotherm model and pseudo second order kinetic model, both indicating a chemisorption process for the uptake of Eu(III) with a maximum uptake capacity of approximately 21 mg/g of PIM. The mixed membrane also employed for recovery of Am(III) from a filter paper waste sample which indicated ∼90 % recovery of the metal ion at 0.01 M HNO₃ indicating possible application of the developed synergistic PIM in the analysis of real samples.

一般来说，两亲性萃取剂分别为酸性和中性萃取金属离子时，在溶剂萃取过程中会出现聚集和协同作用的现象。同样，在多萃取剂体系中，聚合可以驱动金属离子的协同萃取。然而，据我们所知，聚集和协同作用之间的关系尚未在更复杂的系统中探索，如混合萃取剂基聚合物增塑膜。在此，我们观察了在稀薄的硝酸溶液（0.01-2 M）中，硝基苯基辛醚（NPOE）增塑纤维素三乙酸酯（CTA）基聚合物包合膜（PIM）与酸性萃取剂二（2-乙基己基）磷酸（D2EHPA）和中性萃取剂N，N,N ',N ' -四辛基二乙醇酰胺（TODGA）协同萃取Am（III）。傅里叶变换红外光谱（FTIR）、光致发光（PL）、小角度X射线散射（SAXS）和萃取研究表明，配体参与了Eu(III)（被认为是Am（III）的替代品）的萃取，并在膜结构中形成聚集体。基于SAXS研究的结果，给出了一种可能的机制来解释聚集如何协同协助金属离子的提取。Eu（III）的自扩散系数由非稳态放射性示踪剂扩散法测定，该方法与膜的SAXS研究中聚集体的大小有很好的相关性。D2EHPA和TODGA摩尔比为2:1的混合膜符合Langmuir等温线模型和准二级动力学模型，表明其对Eu（III）的吸收是一个化学吸附过程，最大吸收能力约为21 mg/g PIM。该混合膜还用于从滤纸废样品中回收Am(III)，表明在0.01 M HNO3下金属离子回收率为~ 90%，表明所开发的协同PIM可能应用于实际样品的分析。

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引用次数: 0

Tailoring multifunctional quaternized polyvinyl alcohol coatings for reverse osmosis membranes with enhanced permeability, fouling resistance and stability 为反渗透膜定制多功能季铵化聚乙烯醇涂料，具有增强的渗透性、抗污性和稳定性

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-22 DOI: 10.1016/j.memsci.2026.125179

Xueke Cai , Xiaoying Long , Huiqi Zhang , Yiwen Xu , Hai Huang , Sanchuan Yu , Congjie Gao

Polyvinyl alcohol (PVA) antifouling coatings are among the most commercially established materials in reverse osmosis (RO) membrane fabrication due to the excellent hydrophilicity. However, excessive hydrogen bonding within the PVA matrix often leads to significant permeability loss. In this study, a straightforward quaternization method to construct quaternized PVA coatings (QPVA) on the RO membranes surface. The introduction of quaternary ammonium groups disrupts the crystalline structure of PVA, thereby reducing transport resistance and mitigating flux decline, in which the water flux was enhanced from 26.4 to 33.8 L·m⁻²·h⁻¹ of the PVA-coated membrane. Moreover, QPVA-coated membranes exhibit near-neutral surfaces and antimicrobial properties, leading to a substantial reduction in both organic and biological fouling with the antibacterial efficiency increasing from 27.5 % for PVA-coated membranes to 97.5 % after quaternization. Furthermore, crosslinking treatment enhances the stability of QPVA coatings by improving coating adhesion and reducing leaching under hydraulic stress. Structural characterizations (FTIR, XPS and SEM) confirm the successful quaternization and the disruption of PVA crystallinity. Long-term filtration and antifouling tests demonstrate the superior performance and durability of QPVA-coated membranes. These findings highlight the potential of the quaternization strategy in developing multifunctional antifouling coatings with improved permeability and stability, which can be easily integrated into existing fabrication processes to extend membrane lifespan in advanced water purification.

聚乙烯醇（PVA）防污涂料由于其优异的亲水性而成为反渗透（RO）膜制造中最具商业价值的材料之一。然而，PVA基体中过量的氢键往往会导致显著的渗透率损失。本研究采用直接季铵化方法在反渗透膜表面构建季铵化PVA涂层（QPVA）。季铵基团的引入破坏了PVA的晶体结构，从而降低了传输阻力，减缓了通量的下降，其中PVA包覆膜的水通量从26.4 L·m−2·h−1提高到33.8 L·m−2·h−1。此外，qpva涂层膜具有近中性表面和抗菌性能，导致有机和生物污染大幅减少，抗菌效率从27.5%增加到季铵化后的97.5%。此外，交联处理通过改善涂层附着力和减少水力应力下的浸出，提高了QPVA涂层的稳定性。结构表征（FTIR， XPS和SEM）证实了成功的季铵化和PVA结晶度的破坏。长期过滤和防污试验表明，qpva涂层膜具有优异的性能和耐久性。这些发现突出了季铵化策略在开发具有改善渗透性和稳定性的多功能防污涂料方面的潜力，这些防污涂料可以很容易地集成到现有的制造工艺中，以延长高级水净化中膜的寿命。

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引用次数: 0

Nanofiltration of synthetic HTL-AP: rejection, fouling analysis, and membrane autopsy 合成HTL-AP的纳滤：排斥、污染分析和膜解剖

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-22 DOI: 10.1016/j.memsci.2026.125178

Soorena Gharibian , Knud Villy Christensen , Rime Bahij , Morten Enggrob Simonsen , Massimiliano Errico

Valorization or recycling of the hydrothermal liquefaction aqueous phase (HTL-AP) pose a substantial obstacle to the commercial use of the HTL process for biomass (especially algal). This is due to its high concentration of organic constituents and nutrients. This article focus on nanofiltration (NF) of acidic and basic synthetic HTL-AP using a DuPont FilmTec™ NF90 membrane in a batch crossflow module. The emphasis is on rejection performance and fouling behavior, supported by membrane autopsy. Overall, almost 90 % rejection of COD, NH₄⁺, and PO₄³⁻, and TDS/conductivity was achieved. HTL-AP(pH = 4) led to higher NH₄⁺ rejection (94 ± 1 %) compared with pH = 8.5 (83 ± 3 %). This can be attributed to the formation of a gel layer and the equilibrium between NH₄⁺ and NH_3, favoring the more permeable NH₃ at higher pH. Flux monitoring revealed that NF90 performs better (J_{30 wt% recovery}/J₀ ca. 0.77 ± 0.02) with HTL-AP(pH = 8.5) than at pH = 4 (0.56 ± 0.06) since at pH = 8.5 most of the small organic compounds are deprotonated and therefore exhibit weaker interactions with the negatively charged NF90 surface. At both HTL-AP pH levels irreversible fouling is negligible while gel layer and concentration polarization are major contributors which are reversible through water flushing. Resistance due to the gel layer formation was more prominent for HTL-AP(pH = 4). The presence of a thin gel layer was confirmed through attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), water contact angle measurements, and thermal gravimetric analysis (TGA). In addition, fouling resistance due to pore blockage and persistent adsorbed foulants inside the membrane matrix is also a significant contributor. This was removed successfully by basic cleaning (NaOH).

水热液化水相（HTL- ap）的增值或再循环对生物质（特别是藻类）HTL工艺的商业应用构成了重大障碍。这是由于其高浓度的有机成分和营养物质。本文重点研究了在间歇交叉流模块中使用杜邦FilmTec™NF90膜对酸性和碱性合成html - ap进行纳滤（NF）。重点是排斥性能和污染行为，支持膜解剖。总体而言，COD、NH4+、PO43−的去除率和TDS/电导率均达到近90%。HTL-AP（pH = 4）的NH4+排异率（94±1%）高于pH = 8.5（83±3%）。这可以归因于凝胶层的形成以及NH4+和NH3之间的平衡，在较高的pH下有利于更具渗透性的NH3。流量监测显示，与pH = 4（0.56±0.06）相比，在HTL-AP（pH = 8.5）下，NF90的性能更好（J30 wt%回收率/J0约0.77±0.02），因为在pH = 8.5时，大多数小有机化合物被去质子化，因此与带负电荷的NF90表面的相互作用较弱。在这两种pH水平下，不可逆污染可以忽略不计，而凝胶层和浓度极化是主要的污染因素，通过水冲洗是可逆的。对于pH = 4的html - ap，凝胶层形成的抗性更为突出。通过衰减全反射-傅里叶变换红外光谱（ATR-FTIR）、扫描电镜（SEM）、水接触角测量和热重分析（TGA）证实了薄凝胶层的存在。此外，由于孔隙堵塞和膜基质内持续吸附的污垢而产生的污垢阻力也是一个重要的因素。通过碱性清洗（氢氧化钠）成功地将其去除。

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引用次数: 0

Positive microporous polymer nanofiber interlayer tailored polyamide nanofiltration membranes for Li+/Mg2+ separation 正微孔聚合物纳米纤维层间定制聚酰胺纳滤膜用于Li+/Mg2+分离

IF 9 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2026-01-22 DOI: 10.1016/j.memsci.2026.125173

Jia-Chen Zhang , Bing-Xin Gu , Hui-Qian Huo , Yue Shen , Ming-Jie Yin , Quan-Fu An

Construction of positively charged nanofiltration membranes is essential for extracting lithium ions from salt-lake brine to meet the growing demand of the new energy industry. However, conventional membranes suffer from low water permeability due to the large thickness of the fabricated positive-charged polyamide (PA) layer, which increases transport resistance. To address this challenge, a porous interlayer was introduced to regulate the formation of the PA layer and accelerate water transport. Specifically, water-dispersible conjugated microporous polymer (CMP) fibers were synthesized and blended with positively charged polyethyleneimine (PEI) to form a porous, positively charged interlayer. The PEI in this interlayer further participated in the interfacial polymerization process, tailoring the PA morphology and converting the originally negative surface charge to positive. As a result, a dual positively charged membrane was obtained, featuring an enlarged surface area in the PA top layer and a porous structure in the interlayer. Benefiting from the synergistic effects of the Donnan exclusion and reduced transport resistance, the membrane exhibited outstanding separation performance in purifying lithium from a Mg²⁺/Li⁺ mixed solution (mass ratio 20), achieving a water permeance of 11.3 L m⁻² h⁻¹⋅bar⁻¹ and a separation factor of 43.8. Furthermore, the membrane maintained stable performance during a 10-day continuous operation, demonstrating strong promise for practical applications.

从盐湖卤水中提取锂离子，以满足新能源产业日益增长的需求，构建带正电的纳滤膜是必不可少的。然而，由于制备的带正电的聚酰胺（PA）层厚度大，增加了运输阻力，传统膜的透水性较低。为了解决这一挑战，引入了多孔夹层来调节PA层的形成并加速水的输送。具体来说，合成了可水分散的共轭微孔聚合物（CMP）纤维，并与带正电的聚乙烯亚胺（PEI）共混，形成了多孔的带正电的中间层。该夹层中的PEI进一步参与了界面聚合过程，调整了PA的形态并将原本带负电荷的表面电荷转化为正电荷。结果得到了双正电荷膜，其特点是PA顶层表面积增大，中间层呈多孔结构。得益于Donnan排斥性的协同作用和传输阻力的降低，该膜在Mg2+/Li+混合溶液（质量比为20）中表现出优异的锂分离性能，其水透性为11.3 L m−2 h−1⋅bar−1，分离系数为43.8。此外，该膜在10天的连续运行中保持了稳定的性能，显示出了实际应用的强大前景。

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引用次数: 0

Stepwise growth for preparing highly loaded ZIF-8 ultrathin mixed matrix membranes towards efficient CO2/N2 separation 制备高负载ZIF-8超薄混合基质膜以实现高效CO2/N2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.2026.125183

Peng Li , De Ao , Zhenjie Gu , Zhihua Qiao , Chongli Zhong

Metal-organic framework (MOF)-based membranes show promising potential for gas separation. However, it remains challenging to fully exploit the synergistic advantages of MOF crystals and polymers for fabricating highly loaded mixed matrix membranes (MMMs). Herein, a highly loaded ZIF-8 ultrathin MMM was prepared in situ via a stepwise growth strategy. Driven by the diffusion rate difference between the ligand and polyethyleneimine (PEI-600), preferentially formed ZIF-8 crystals served as the dominant phase, while the subsequently developed PEI-Zn²⁺ crosslinked network acted as an intergranular densification phase. Owing to the reduction in ZIF-8 crystal size induced by PEI, the MMMs exhibited an ultrathin thickness of only 160 nm. Furthermore, PEI enhanced the molecular sieving ability of crystals and membrane's CO₂/N₂ solubility selectivity by regulating the pore structure and membrane composition. With a high ZIF-8 loading of 84.3 %, the resulting MMMs demonstrated an excellent CO₂ permeance of 3177.4 GPU, accompanied by a CO₂/N₂ selectivity of 36.9. Notably, it maintained stable separation performance after bending and during long-term operation, showing good processability and industrial application potential. This strategy not only reinforces the advantages of MOF-based gas separation membranes but also provides a new paradigm for fabricating highly loaded MMMs.

金属有机骨架（MOF）基膜在气体分离方面具有广阔的应用前景。然而，如何充分利用MOF晶体和聚合物的协同优势来制造高负载混合基质膜（MMMs）仍然是一个挑战。本文通过逐步生长策略原位制备了高负载的ZIF-8超薄MMM。在配体与聚乙烯亚胺（PEI-600）扩散速率差异的驱动下，优先形成的ZIF-8晶体为主导相，随后形成的PEI-Zn2+交联网络为晶间致密相。由于PEI导致ZIF-8晶体尺寸减小，MMMs的超薄厚度仅为160 nm。此外，PEI通过调节孔结构和膜的组成，增强了晶体的分子筛分能力和膜的CO2/N2溶解度选择性。在ZIF-8负载量高达84.3%的情况下，所制得的MMMs具有优异的CO2透过率，为3177.4 GPU， CO2/N2选择性为36.9。值得注意的是，它在弯曲后和长期运行中保持稳定的分离性能，具有良好的可加工性和工业应用潜力。该策略不仅增强了mof基气体分离膜的优势，而且为制造高负载的mm材料提供了新的范例。

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引用次数: 0

Electrified CoFe2O4-OVs/MXene 2D laminar nanoconfined catalytic membrane enables efficient micropollutant decontamination via enhanced Fenton-like reaction 电气化CoFe2O4-OVs/MXene 2D层状纳米限制催化膜通过增强的芬顿反应有效地去除微污染物

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.2026.125197

Dengao Chang , Jiahui Wang , Tao Xu , Yujie Lei , Yi Luo , Yalun Zhao , Yiming Xie , Haoxuan Zou , Meizeng Liu , Queping Yang , Xu Wang

Heterogeneous Fenton-like reaction using PMS suffers from mass transfer limitations and inefficiencies in ROS generation, while conventional catalytic membranes face trade-offs between membrane permeability-selectivity and catalyst reactivity-stability. To overcome these challenges, we developed an electrified CoFe₂O₄-OVs/MXene 2D laminar nanoconfined catalytic membrane, which innovatively combines the properties of 2D membrane filtration, nanoconfinement catalysis, and electrochemical enhancement. The membrane system achieved 97.4 % SMX degradation in a single pass (0.034 s), with a first-order rate constant of 170.90 s⁻¹, and a water permeance of 94.8 LMH/bar (7.65 times greater than MXene membrane control). Owing to nanoscale spatial confinement and electrochemically accelerated redox cycling of the catalyst, metal leaching was significantly suppressed (Co: 0.15 mg/L, Fe: 0.05 mg/L). It demonstrated broad-spectrum degradation efficacy against electron-rich contaminants (IP < 9.0) and maintained robust performance across diverse complex water conditions. Mechanism studies identified ¹O₂ as the primary ROS, and the applied cathodic potential was found to facilitate the redox cycling of Co³⁺/Co²⁺ and Fe³⁺/Fe²⁺. DFT calculations verified that OVs and nanoconfinement both promote PMS activation. This study demonstrates the potential of the electrified CoFe₂O₄-OVs/MXene 2D laminar nanoconfined catalytic membrane for sustainable and efficient water purification.

使用PMS的非均相fenton类反应存在传质限制和ROS生成效率低下的问题，而传统的催化膜则面临着膜透性选择性和催化剂反应性稳定性之间的权衡。为了克服这些挑战，我们开发了一种电气化CoFe2O4-OVs/MXene 2D层状纳米限制催化膜，该膜创新地结合了2D膜过滤、纳米限制催化和电化学增强的特性。该膜体系在单次通过（0.034 s）的情况下，SMX降解率达到97.4%，一阶速率常数为170.90 s−1，透水率为94.8 LMH/bar（比MXene膜高7.65倍）。由于纳米尺度的空间限制和电化学加速催化剂的氧化还原循环，金属浸出（Co: 0.15 mg/L, Fe: 0.05 mg/L）明显受到抑制。它对富电子污染物（IP < 9.0）表现出广谱降解效果，并在各种复杂的水条件下保持稳定的性能。机理研究发现1O2为主要活性氧，外加阴极电位有利于Co3+/Co2+和Fe3+/Fe2+的氧化还原循环。DFT计算证实了OVs和纳米约束都促进了PMS的激活。该研究证明了电气化CoFe2O4-OVs/MXene 2D层状纳米限制催化膜在可持续和高效水净化方面的潜力。

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引用次数: 0