Advanced Membranes最新文献_第7页

Hybrid energy harvesting enabled by a covalent organic framework membrane 由共价有机框架膜实现混合能量收集

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100130

Jiaming Yi, Zhuozhi Lai, Qing Guo, Zhiwei Xing, Qi Sun

The integration of water and thermal energy harvesting presents a promising solution to the intermittency issues associated with individual energy sources. In this study, we show a covalent organic framework (COF) membrane featuring subnanometer, one-dimensional ionic channels, which demonstrate remarkable stability in both acidic and saline environments. The membrane exhibits exceptional permselectivity across various electrolyte solutions, enabling efficient osmotic energy harvesting from proton gradients via reverse electrodialysis. Under a 50-fold concentration gradient of H₂SO₄, the membrane achieved a peak output power density of 97.1 W m⁻². Furthermore, the membrane facilitates thermo-osmotic energy conversion by selectively screening ionic charges driven by combined salinity and temperature gradients. Under simulated estuarine salinity conditions and a 30 K temperature gradient, the COF membrane achieved a maximum output power density of 91.4 W m⁻²—an 18-fold increase compared to the commercial benchmark (5 W m⁻²). This study underscores the significant potential of COF membranes for efficient energy conversion, enabling the effective harvesting of untapped osmotic and low-grade heat energy.

水和热能收集的整合为解决与单个能源相关的间歇性问题提供了一个有希望的解决方案。在这项研究中，我们展示了一种具有亚纳米、一维离子通道的共价有机框架（COF）膜，它在酸性和盐水环境中都表现出显著的稳定性。该膜在各种电解质溶液中表现出优异的透选择性，通过反电渗析从质子梯度中高效地收集渗透能量。在H2SO4浓度梯度为50倍的条件下，膜的峰值输出功率密度为97.1 W m−2。此外，该膜通过选择性地筛选由盐度和温度梯度驱动的离子电荷，促进热渗透能量转换。在模拟河口盐度条件和30 K温度梯度下，COF膜的最大输出功率密度为91.4 W m−2，比商业基准（5 W m−2）增加了18倍。这项研究强调了COF膜在高效能量转换方面的巨大潜力，能够有效地收集未开发的渗透和低品位热能。

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引用次数: 0

Endowing the nanostructured ion channels of anion conductive membranes with negative charge to boost the Cl−/SO42− ion separation via electrodialysis 在阴离子导电膜的纳米离子通道中赋予负电荷，促进电渗析对Cl - /SO42 -离子的分离

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100128

Wenlong Ding , Haoyu Liu , Jiayi Liao , Tongtong Wang , Dongze Li , Yu Xu , Shiyu Zhou , Zhiqiang Wu , Wenhui Shi , Jiangnan Shen , Junbin Liao

Construction of homogeneous polymer ion-exchange membranes (IEMs) with suitable ion transport channels and stable structures is crucial to the separation of mono-/multi-valent anions. Amphoteric ion-exchange membrane (AIEM) is a special type of IEM that possesses unique properties due to the presence of both anion exchange groups and cation exchange groups. In this work, we have grafted 1-bromoheptane and 3-bromopropanesulfonate onto the poly(aryl ether sulfone) chain through nucleophilic substitution reactions. Unlike the IEM attaching different ion-change functional groups onto one side-chain, this kind of AIEM bears two kinds of ion-change functional groups on dual side-chains. The results show that the as-prepared AIEMs could maintain low water absorption (<20 %) and swelling ratios (<11 %). The optimal surface area resistance is 6.31 Ω∙cm². The perm-selectivity (Cl⁻/SO₄²⁻) of the optimized PAES-TA/BS-0.85 AIEMs in a binary mixed solution system at 2.5 mA∙cm² could be achieved as high as 67.46, which is much higher than commercial ACS IEMs under the same conditions. Small Angle X-ray scattering reveals a distinct phase separation pattern within the AIEM matrix, which is due to the introduction of sulfonates to increase the hydrophilicity of the side-chains. The combined effects of pore size screening and electrostatic repulsion render the high selectivity of as-prepared AIEMs.

构建具有合适离子传输通道和稳定结构的均相聚合物离子交换膜是分离单价/多价阴离子的关键。两性离子交换膜（两性离子交换膜）是一种特殊类型的离子交换膜，由于同时存在阴离子交换基和阳离子交换基而具有独特的性能。在这项工作中，我们通过亲核取代反应将1-溴庚烷和3-溴丙磺酸接枝到聚芳醚砜链上。与IEM在一个侧链上附着不同的离子变化官能团不同，这种AIEM在双侧链上具有两种离子变化官能团。结果表明，制备的aiem能保持较低的吸水率（20%）和溶胀率（11%）。最佳表面积电阻为6.31 Ω∙cm2。优化后的PAES-TA/BS-0.85 AIEMs在2.5 mA∙cm2的二元混合溶液体系中的选择性（Cl−/SO42−）高达67.46，远高于同等条件下的商用ACS IEMs。小角度x射线散射揭示了AIEM基体中明显的相分离模式，这是由于引入了磺酸盐来增加侧链的亲水性。孔径筛选和静电斥力的共同作用使得制备的aiem具有较高的选择性。

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引用次数: 0

Three-in-one polyimide-based blended membrane for Upgrading helium separation performance and physical aging resistance 三合一聚酰亚胺基共混膜提高氦分离性能和物理抗老化性能

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100139

Bingbing Gao , Yiran Peng , Ming Wu , Hua Ma , Jianchao Sun , Peng Zhang , Xingzhong Cao , Like Ouyang , Xiaobin Fu , Chunfang Zhang , Yunxiang Bai , Lijun Liang , Yang Liu , Liangliang Dong

Polyimide membranes have attracted considerable attention for gas separation applications; however, achieving efficient helium (He) separation remains a significant challenge due to the low fractional free volume (FFV) and poorly controlled pore size distribution. Here, we report a novel three-in-one polyimide-based blended membrane constructed from a polymer (6FDA-TFMB) and alkynyl-based polyimide (EBPA-TB) matrix via thermal crosslinking. By carefully designing membrane synthesis and structure, the resulting membrane achieves the “1 + 1>2” effect: (i) high He selectivity derived from reinforced interphase adhesion and size-sieving ability due to the hydrogen bonding and similar structure between 6FDA-TFMB and EBPA-TB; (ii) high He permeability derived from the rigid cross-linked network distorting the EBPA-TB chain packing and generating additional free volume; (iii) high anti-aging performance derived from the thermal crosslinking preventing microstructural rearrangements. The optimal membrane an unprecedented combination of high He permeability (51.24 Barrer), excellent He/N₂ selectivity (146.40) and remarkable aging resistance (less than 3.97 % of permeability decrease over 50 days), outperforming the performance of state-of-the-art polyimide-based blended membranes for He purification. This three-in-one blended membrane construction strategy provides a general toolbox for the development of next-generation, high-performance blended membranes with desirable performance for diverse industrial applications.

聚酰亚胺膜在气体分离方面的应用引起了人们的广泛关注；然而，由于低分数自由体积（FFV）和孔隙大小分布控制不佳，实现高效氦（He）分离仍然是一个重大挑战。在这里，我们报道了一种新型的三合一聚酰亚胺基共混膜，由聚合物（6FDA-TFMB）和炔基聚酰亚胺（EBPA-TB）基质通过热交联构建而成。通过精心设计膜的合成和结构，所制备的膜实现了“1 + 1>2”效应：(1)由于6FDA-TFMB和EBPA-TB之间的氢键和相似的结构，增强了相间粘附和筛分能力，从而获得了高He选择性；（ii）由于刚性交联网络扭曲EBPA-TB链填料并产生额外的自由体积而产生的高He渗透率；（iii）高抗老化性能源于热交联防止微观结构重排。最佳膜具有前所未有的高He渗透率（51.24 Barrer），优异的He/N2选择性（146.40）和卓越的耐老化性（50天内渗透率下降低于3.97%），优于最先进的聚酰亚胺基混合膜用于He净化。这种三合一的混合膜结构策略为开发下一代高性能混合膜提供了一个通用工具箱，具有理想的性能，适用于各种工业应用。

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引用次数: 0

Review on molecular modeling-facilitated design of porous membranes 分子模拟促进多孔膜设计的研究进展

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100145

Wei Yang , Meina Xiong , Dongliang Jin, Jing Zhong

Molecular modeling techniques are regarded as an effective approach to study various advanced membranes at the microscale. These investigations of porous membranes are devoted to better understanding their chemical structures, pore topology and morphology, transport/permeation mechanisms, and the structure-activity relationship. This review provides an overview of current research on the molecular simulations of the structure, gas-/liquid-phase transport, and phase behaviors in porous membranes. In more detail, quantum chemistry is first introduced to probe the structures of porous membranes at the molecular/atomistic level. In this part, the pore topology estimated by using the geometric algorithm is also presented. Transport properties of porous membranes determined using molecular dynamics are then summarized. To study the formation kinetics of membranes and the diffusion kinetics of fluids within membrane’s pores, free energy calculations are discussed. Moreover, the phase behaviors involved in the membrane process by Monte Carlo simulations are presented. Finally, a brief discussion of the multiscale simulations is provided to comprehensively understand the structure-activity relationship. These theoretical works pave constructive ways for the design of functional membranes used for separation and purification, energy harvesting and storage, petrochemical engineering, and so on.

分子模拟技术被认为是在微观尺度上研究各种先进膜的有效途径。这些多孔膜的研究致力于更好地了解它们的化学结构、孔隙拓扑和形态、传输/渗透机制以及构效关系。本文综述了多孔膜结构、气/液相输运和相行为的分子模拟研究现状。更详细地说，量子化学首次被引入到在分子/原子水平上探测多孔膜的结构。在这一部分中，还介绍了利用几何算法估计的孔隙拓扑结构。然后总结了用分子动力学方法测定多孔膜的输运特性。为了研究膜的形成动力学和膜孔内流体的扩散动力学，讨论了自由能的计算。此外，通过蒙特卡罗模拟给出了膜过程中所涉及的相行为。最后，对多尺度模拟进行了简要讨论，以全面了解结构-活动关系。这些理论工作为分离净化、能量收集与储存、石油化工等领域功能膜的设计提供了有益的途径。

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引用次数: 0

Electrostatically assembled core-shell particles and their reaction sintering for SiC membranes with improved oil/water separation and thermal regeneration efficiency 静电组装核壳粒子及其反应烧结SiC膜的油水分离和热再生效率提高

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100148

Junyou Li , Qilin Gu , Huiqin Zhang , Zhaoxiang Zhong , Yiqun Fan , Weihong Xing

Porous SiC membranes prepared through the reaction sintering between the additive and surface oxidation generated silica have gained increasing attention in the fields of oil-water separation. Previous efforts mainly focused on the types and contents of additives incorporated by physically mixing process, while their distribution on the microstructure and separation performance of SiC membranes has been rarely involved. This work proposed to prepare SiC membranes by uniformly coating AlOOH sol on SiC particles via the electrostatic interaction and the subsequent reaction sintering of the derived SiC@alumina core-shell particles. It is found that the surface coating enabled the homogeneous dispersion of the additives in SiC powder matrix, which not only facilitated the reactive sintering process and notably reduced the amount of residual SiO₂ in SiC membranes, but also homogenized the pore structure. Also, the oxidation pathway of SiC had been altered, which substantially retarded the oxidation degree. Impressively, the as-prepared SiC membranes exhibited 20 % improvement in alkali resistance, and enhanced oil-in-water emulsion separation efficiency when compared with those prepared by the conventional mechanical mixing method. Besides, the fouled SiC membranes prepared from the core-shell units can be more efficiently regenerated by using the emerging Joule heating technique. The present work provides a facile and effective pathway to the preparation of high-performance SiC membranes through the reaction sintering of rationally designed core-shell particles for high-efficient separation.

将添加剂与表面氧化生成的二氧化硅反应烧结制备多孔碳化硅膜，在油水分离领域受到越来越多的关注。以往的研究主要集中在物理混合过程中加入添加剂的种类和含量，而添加剂的分布对SiC膜的微观结构和分离性能的影响较少。本文提出通过静电相互作用将AlOOH溶胶均匀涂覆在SiC颗粒上，并通过后续反应烧结得到SiC@alumina核壳颗粒，制备SiC膜。结果表明，表面涂层使添加剂均匀分散在SiC粉末基体中，有利于反应烧结过程的进行，显著降低了SiC膜中残余SiO2的含量，使孔结构均匀化。同时，碳化硅的氧化途径发生了改变，大大延缓了氧化程度。令人印象深刻的是，与传统的机械混合法制备的SiC膜相比，制备的SiC膜的耐碱性能提高了20%，分离油水乳液的效率也提高了。此外，利用新兴的焦耳加热技术可以更有效地再生由核壳单元制备的污染SiC膜。本研究为合理设计核壳颗粒反应烧结制备高性能SiC膜提供了一条简便有效的途径。

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引用次数: 0

Porous organic cage separation membranes: Exploratory journey from preparation to application 多孔有机笼分离膜：从制备到应用的探索之旅

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2024.100125

Zhihao Song , Ying Wang , Zhiyuan Zha , Zhi Wang , Song Zhao

Porous organic cages (POCs) represent a novel class of low-density crystalline materials that exhibit distinctive pores comparable to those observed in three-dimensional extended network materials, including metal organic frameworks (MOFs), covalent organic frameworks (COFs), and porous organic polymers (POPs). Owing to their adjustable pore sizes, high specific surface areas, and discrete molecular structures, POCs exhibit excellent solution dispersibility and processability, thereby providing a broad spectrum of potential strategies for the design and fabrication of POC separation membranes. This review presents a comprehensive and systematic summary of the recent research progress in the preparation techniques and applications of POC separation membranes. We summarize a comprehensive overview of preparation strategies for POC separation membranes, including physical blending, spin coating, and interfacial polymerization, and analyze their advantages and limitations. Recent developments in the separation applications of POC separation membranes are highlighted, such as gas separation, ion separation and molecular separation, as well as current challenges and future development trends in this field, are briefly discussed. We anticipate that this review will offer a pertinent perspective to promote advancements in the development of advanced POC separation membranes, and be useful to researchers in related fields.

多孔有机笼（POCs）是一类新型的低密度晶体材料，具有与三维扩展网络材料（包括金属有机框架（MOFs）、共价有机框架（COFs）和多孔有机聚合物（pop））相似的独特孔隙。由于其可调节的孔径、高比表面积和离散的分子结构，POC具有优异的溶液分散性和可加工性，从而为POC分离膜的设计和制造提供了广泛的潜在策略。本文对聚氯乙烯分离膜的制备技术及其应用的最新研究进展进行了全面系统的综述。本文综述了聚氯乙烯分离膜的制备策略，包括物理共混、自旋涂层和界面聚合，并分析了它们的优点和局限性。重点介绍了POC分离膜在气体分离、离子分离和分子分离等分离应用领域的最新进展，并简要讨论了该领域目前面临的挑战和未来的发展趋势。我们希望本文的综述能够为推进先进POC分离膜的开发提供一个有针对性的视角，并对相关领域的研究人员有所帮助。

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引用次数: 0

Sandwich-like composite membrane for advanced radiative cooling applications 三明治状复合膜，用于先进的辐射冷却应用

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100133

Wuyi Liu , Qing Tian , Yuyi Wang , Liu Yang , Dan Lu , Zhikan Yao , Lin Zhang

Passive daytime radiative cooling (PDRC) offers an energy-efficient method of cooling by reflecting sunlight and emitting heat to the cold outer space through the atmospheric transparent window (ATW). For optimal performance, radiative coolers require high reflectance in the solar spectrum to minimize solar heat absorption and near-unity emissivity in the ATW to maximize heat dissipation. Here, we present a scalable composite radiative cooling membrane (cRCM) composed of a hierarchically porous polysulfone (PSF) layer, sandwiched between two flexible polydimethyl-siloxane (PDMS) layers. The PSF layer, fabricated using a simple non-solvent induced phase separation (NIPS) method, exhibits a high solar reflectance of 98.2 % across wavelengths of 0.3–2.5 μm owing to its high refractive index of 1.64. The PDMS layers, attached on both sides of the PSF membrane via roll-to-roll lamination, offer excellent mid-infrared (MIR) emissivity of 94.2 % across wavelengths of 2.5–20 μm. Under midday conditions, the membrane achieves an average temperature reduction of 5.0 °C below ambient air temperature, with a theoretical cooling power of 114 W/m². Year-round simulations indicate significant cooling energy saving in warm and tropical regions. The new membrane represents a significant advance in PDRC technology, offering promising applications in energy-efficient cooling systems.

被动日间辐射冷却（PDRC）提供了一种节能的冷却方法，通过大气透明窗（ATW）反射阳光并将热量散发到寒冷的外层空间。为了获得最佳性能，辐射冷却器需要太阳光谱中的高反射率，以最大限度地减少太阳吸热，并在ATW中接近统一的发射率，以最大限度地散热。在这里，我们提出了一种可伸缩的复合辐射冷却膜（cRCM），由分层多孔聚砜（PSF）层组成，夹在两个柔性聚二甲基硅氧烷（PDMS）层之间。采用简单的非溶剂诱导相分离（NIPS）方法制备的PSF层在0.3 ~ 2.5 μm波长范围内具有98.2%的高太阳反射率，折射率为1.64。PDMS层通过卷对卷层压贴在PSF膜的两侧，在2.5-20 μm波长范围内提供了94.2%的优异中红外（MIR）发射率。在正午条件下，膜的平均温度比环境空气温度低5.0℃，理论冷却功率为114 W/m2。全年模拟表明，温暖和热带地区的制冷节能效果显著。新膜代表了PDRC技术的重大进步，在节能冷却系统中提供了有前途的应用。

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引用次数: 0

Thermally stable polyamide-imide (PAI) hierarchical porous separator for lithium metal batteries 用于锂金属电池的热稳定聚酰胺-亚胺（PAI）分层多孔分离器

IF 9.5

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100168

Qinghai Chen , Zhiguang Zhang , Yingda Huang , Aiting Liu , Hao Wang , Rongfei Zhou , Shuanyan Kang , Junfen Li , Nanwen Li

Although the structural design and physicochemical characteristics of separators are critical determinants of lithium metal batteries safety and overall performance, commercial polyolefin separators exhibit inherent limitations in thermal stability, porosity and electrolyte wettability. These deficiencies not only elevate the propensity for battery safety incidents but also severely compromise ionic transport capability and cycling performance. Herein, we have designed and synthesized a high molecular weight polyamide-imide (PAI) polymer by one-step polymerization, and subsequently prepared a PAI separator with high thermal stability, high porosity and excellent electrolyte wettability using vapor-induced phase separation. Specifically, thermal stability testing has confirmed that PAI separators maintain structural integrity at temperature as high as 240 °C. Additionally, a bi-continuous sponge-like structure with high porosity (86 %) has been achieved by controlling the phase inversion parameters, and the abundant porous structure has facilitated ion transport. Thus, the PAI separators exhibit an ionic conductivity of 1.67 mS cm⁻¹ and a lithium ions transference number of 0.64. Importantly, the polar amide and imide groups in the PAI molecular structure have further ensured excellent electrolyte wettability of the PAI separator, which has resulted in high electrolyte uptake (326 %). As a result, LFP/Li batteries with PAI separators exhibit superior rate performance (147 mAh g⁻¹ at 1 C) and excellent capacity retention (78.6 % at 200 cycles) which are better than that of the commercial PE separator. This investigation reveals that the organic soluble and thermal stable PAI material could be excellent lithium metal batteries separator candidates to improve the safety and comprehensive performance.

尽管隔膜的结构设计和物理化学特性是锂金属电池安全性和整体性能的关键决定因素，但商用聚烯烃隔膜在热稳定性、孔隙度和电解质润湿性方面存在固有的局限性。这些缺陷不仅增加了电池发生安全事故的可能性，而且严重影响了离子传输能力和循环性能。本研究通过一步聚合法设计合成了一种高分子量的聚酰胺-亚胺（PAI）聚合物，并利用气相分离技术制备了具有高热稳定性、高孔隙率和优异电解质润湿性的PAI分离器。具体来说，热稳定性测试已经证实PAI分离器在高达240°C的温度下保持结构完整性。通过控制相变参数，获得了高孔隙率（86%）的双连续海绵状结构，丰富的多孔结构有利于离子的输运。因此，PAI隔膜的离子电导率为1.67 mS cm−1，锂离子转移数为0.64。重要的是，PAI分子结构中的极性酰胺和亚胺基团进一步确保了PAI分离器优异的电解质润湿性，这导致了高电解质吸收率（326%）。结果表明，采用PAI隔膜的LFP/Li电池具有优于商用PE隔膜的倍率性能（1℃时147 mAh g−1）和优良的容量保持率（200次循环时78.6%）。研究表明，有机可溶且热稳定的PAI材料可以作为锂金属电池隔膜的优良候选材料，提高其安全性和综合性能。

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引用次数: 0

Imidazole-functionalized siloxane cross-linked poly(aryl ether sulfone) anion exchange membranes for monovalent anion separation via electrodialysis 电渗析分离单价阴离子的咪唑功能化硅氧烷交联聚芳醚砜阴离子交换膜

IF 9.5

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2025.100165

Zhiqiang Wu , Yu Xu , Junbin Liao , Qishun Zhang , Wenlong Ding , Yanqing Xu , Huimin Ruan , Jiangnan Shen , Congjie Gao

A siloxane cross-linked, amino-long-chain modified poly(aryl ether sulfone) (PPH-Im_SiO-NH₂-X) anion exchange membrane (AEM) has been synthesized. The results demonstrated that the perm-selectivity (

P_{S O_{4}^{2 -}}^{C l^{-}}

) of the PPH-Im_SiO-NH₂-X AEMs gradually increased with the increasing content of the amino chains and reached its maximum value of 30.17 in the PPH-Im_SiO-NH₂-50 AEM. The mechanism underlying the enhanced selectivity was systematically analyzed by combining SAXS characterization with physico-chemical property evaluations. Specifically: (i) The siloxane cross-linked network effectively suppressed membrane swelling (water uptake ≤8.81 %, swelling ratio ≤3.03 %), thereby ensuring the stability of the ion transport channels; (ii) The amino long-chain interacted physically with the cross-linked network to form entanglements, reducing the size of ion clusters to 0.332 nm and further narrowing the ion channels, which selectively inhibited the migration of SO₄²⁻ via a size-sieving effect. This study not only broadened the application scope of siloxane cross-linking agents in the field of ion exchange membranes (IEMs) but also provided a novel material design strategy for developing anion exchange membranes with high selectivity and excellent stability.

合成了一种硅氧烷交联、氨基长链改性聚芳醚砜（phh - imsio - nh2 - x）阴离子交换膜。结果表明，随着氨基链含量的增加，PPH-ImSiO-NH2-X AEM的选择性（PSO42−Cl−）逐渐增加，在PPH-ImSiO-NH2-50 AEM中达到最大值30.17。结合SAXS表征和理化性质评价，系统分析了选择性增强的机理。具体来说：(1)硅氧烷交联网络有效抑制了膜的溶胀（吸水率≤8.81%，溶胀率≤3.03%），从而保证了离子传递通道的稳定性；（ii）氨基长链与交联网络物理相互作用形成缠结，将离子簇的尺寸减小到0.332 nm，并进一步缩小离子通道，通过筛分效应选择性地抑制了SO42−的迁移。该研究不仅拓宽了硅氧烷交联剂在离子交换膜领域的应用范围，而且为开发具有高选择性和优异稳定性的阴离子交换膜提供了一种新的材料设计策略。

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引用次数: 0

Robust methoxy-based covalent organic frameworks membranes enable efficient near-molecular-weight selectivity 稳健的甲氧基共价有机框架膜实现了高效的近分子量选择性

Advanced Membranes

Pub Date : 2025-01-01 DOI: 10.1016/j.advmem.2024.100112

Yanqing Xu , Jiaqi Xiong , Chenfei Lin , Yixiang Yu , Qite Qiu , Junbin Liao , Huimin Ruan , Arcadio Sotto , Jiangnan Shen

Uniform pore size is essential for molecular sieving in separation membranes. Traditional nanofiltration (NF) polymer membranes struggle with precise structure control due to random chain packing and rapid cross-linking, leading to varied pore sizes and poor molecular discrimination. Covalent organic frameworks (COFs) offer ordered porous structures for enhanced molecular selectivity. We synthesized composite COFs membranes with triphenylamine derivatives through interfacial polymerization, adjusting pore channel functional groups to achieve high water permeance and size-selective molecule retention. The TFB-OMe-TAPA COFs membrane demonstrated sharp rejection profiles, separating solutes of different molecular sizes. A three-stage cascade process was used to fractionate binary molecules with varying charges, achieving a separation factor of 26.7 for heterogeneous charge molecules. This work reveals the selectivity of COF membranes in near-molecular-weight systems, expanding their potential in molecular separations.

均匀的孔径对分离膜的分子筛分至关重要。传统的纳滤聚合物膜由于无序链填充和快速交联，难以精确控制结构，导致孔径大小不一，分子识别能力差。共价有机框架（COFs）提供有序的多孔结构，以增强分子选择性。我们通过界面聚合，调整孔隙通道官能团，合成了具有三苯胺衍生物的复合COFs膜，以实现高透水性和大小选择性分子保留。TFB-OMe-TAPA COFs膜具有明显的分离特性，可分离不同分子大小的溶质。采用三级级联工艺对不同电荷的二元分子进行分馏，对非均相电荷分子的分离系数为26.7。这项工作揭示了COF膜在近分子量体系中的选择性，扩大了它们在分子分离中的潜力。

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引用次数: 0