Journal of Membrane Science最新文献_第9页

Unveiling gas transport mechanisms in tunable MXene nanochannels: Insights from molecular dynamics simulations 揭示可调 MXene 纳米通道中的气体传输机制：分子动力学模拟的启示

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-28 DOI: 10.1016/j.memsci.2024.123459

Xiangcui Qiu , Yihao Zheng , Haibo Li , Konggang Qu , Hui Yan , Rui Li

MXene-based membranes have shown tremendous potential in gas separation applications. Here, molecular dynamics (MD) simulations are used to investigate the effects of varying the structural parameters of Ti₃C₂O₂ nanochannels on the permeation and separation performance of H₂, CO₂, N₂, and CH₄ gases. The results demonstrate that the interlayer spacing significantly influences gas permeability, with wider channels generally exhibiting higher permeance. Channel length, however, has a relatively minor impact on permeability, varying by gas species. Potential of mean force (PMF) analysis reveals that CO₂ molecules face a notable energy barrier at the channel entrance and have the strongest interactions with the MXene interface within the channel, potentially leading to blockage. Spatial density analysis further confirms this CO₂ blockage phenomenon, which diminishes as the interlayer spacing increases. In terms of gas separation selectivity, H₂/CH₄ and H₂/CO₂ mixtures exhibit high selectivity, with maximum values of 41.08 and 27.06, respectively. Notably, the H₂/CO₂ system exhibits a positive correlation between permeability and selectivity, breaking the traditional permeability-selectivity trade-off. This anomalous behavior can be attributed to the CO₂ blockage effect. This study provides theoretical guidance for the design and optimization of MXene-based membrane materials in practical applications.

基于 MXene 的膜在气体分离应用中显示出巨大的潜力。本文利用分子动力学（MD）模拟研究了改变 Ti₃C₂O₂纳米通道的结构参数对 H₂、CO₂、N₂和 CH₄ 气体渗透和分离性能的影响。结果表明，层间间距对气体渗透性有很大影响，通道越宽，渗透率越高。然而，通道长度对渗透性的影响相对较小，且因气体种类而异。平均力势（PMF）分析表明，一氧化碳分子在通道入口处面临明显的能量障碍，并与通道内的 MXene 界面产生最强的相互作用，从而可能导致堵塞。空间密度分析进一步证实了这种 CO₂ 阻塞现象，这种现象随着层间距的增加而减弱。在气体分离选择性方面，H₂/CH₄ 和 H₂/CO₂ 混合物表现出很高的选择性，最大值分别为 41.08 和 27.06。值得注意的是，H₂/CO₂ 系统显示出渗透性和选择性之间的正相关性，打破了传统的渗透性-选择性权衡。这种反常行为可归因于 CO₂ 的阻塞效应。这项研究为基于 MXene 的膜材料在实际应用中的设计和优化提供了理论指导。

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引用次数: 0

Poly(p-terphenylene piperidinium)s with perfluoroalkyl side chains for high-performance anion exchange membranes 用于高性能阴离子交换膜的具有全氟烷基侧链的聚（对三联苯哌啶）s

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-28 DOI: 10.1016/j.memsci.2024.123460

Yu Zhao , Xiaoqian Sun , Tao Wang , Sheng Wang , Haibing Wei , Yunsheng Ding

Anion exchange membranes (AEMs) are essential components in alkaline polymer electrolyte fuel cells. However, the primary challenges for AMEs in fuel cell applications include insufficient alkaline durability and sluggish ion transport efficiency. In response, we here present a side chain fluorination strategy to construct nanoscale phase-separated morphologies in poly(arylene piperidinium)s, leading to percolated hydrophilic domains with high ion transport efficiency. The synthesized perfluoroheptyl-tethered poly(p-terphenylene piperidinium)s (FPTPs) show an excellent conductivity (175 mS cm⁻¹ at 80 °C) and a high ion diffusion coefficient (2 × 10⁶ cm² s⁻¹ in Cl⁻ form membrane at 30 °C) at a relative low ion content (∼2.0 mmol g⁻¹). They also show good dimensional stability (<15 % swelling at 80 °C) and improved alkaline stability (2.6 % piperidinium group loss after 1000 h in 1 M NaOH at 80 °C). An H₂–O₂ fuel cell prototype fabricated with FPTP-15 achieves a high peak power density of 0.89 W cm⁻². Additionally, short-term cell operation at 50 °C demonstrates good durability of over 100 h at 0.2 A cm⁻², showing a slight voltage increase of 160 μV h⁻¹.

阴离子交换膜（AEM）是碱性聚合物电解质燃料电池的重要组成部分。然而，阴离子交换膜在燃料电池应用中面临的主要挑战包括碱性耐久性不足和离子传输效率低下。为此，我们在此提出了一种侧链氟化策略，在聚（芳基哌啶）中构建纳米级相分离形态，从而形成具有高离子传输效率的渗透亲水畴。合成的全氟庚基系链聚（对三联苯哌啶）（FPTPs）在离子含量相对较低（∼2.0 mmol g-1）的情况下，表现出优异的导电性（80 °C时为175 mS cm-1）和较高的离子扩散系数（30 °C时Cl-形式膜的离子扩散系数为2 × 106 cm2 s-1）。它们还表现出良好的尺寸稳定性（80 °C 时膨胀 15%）和更高的碱性稳定性（80 °C 时在 1 M NaOH 溶液中 1000 小时后哌啶基损失 2.6%）。使用 FPTP-15 制造的 H2-O2 燃料电池原型达到了 0.89 W cm-2 的高峰值功率密度。此外，在 0.2 A cm-2 的条件下，电池在 50 °C 下的短期运行时间超过 100 小时，显示出良好的耐久性，电压轻微增加 160 μV h-1。

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引用次数: 0

Highly porous MOF integrated with coordination polymer glass membrane for efficient CO2/N2 separation 高多孔 MOF 与配位聚合物玻璃膜集成，用于高效分离 CO2/N2

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-28 DOI: 10.1016/j.memsci.2024.123453

Ning Li , Chao Ma , Ziyue Wang , Dudu Li , Zhihua Qiao , Chongli Zhong

The MOF crystal-glass composites (CGC) membrane, comprising a MOF crystal and MOF glass matrix, represents a novel self-supported membrane that has been effectively applied in gas separation. Nevertheless, the typical MOF glass matrix requires a higher operating temperature (>400 °C), which constrains its combination with a multitude of MOF crystals characterized by high porosity and low decomposition. In this work, Zn–P-dmbIm (coordination polymer) was chosen as the glass matrix, and MIL-101 crystal with high porosity were integrated at an operating temperature of 190 °C. Furthermore, the intrinsic low porosity of a_gZn-P-dmbIm can be enhanced by the incorporation of higher porosity MIL-101, which possessed a high specific surface area (from ∼1.7 m²/g to 401 m²/g) and porosity (from ∼0.0014 cm³/g/nm to 0.5605 cm³/g/nm) of the CGC. The intimate combination of MIL-101 and a_gZn-P-dmbIm by in-situ melting to reduce the interfacial defects, which also provides a robust foundation for effective CO₂/N₂ separation. In CO₂/N₂ (50/50, v/v) mixed gas conditions, the MIL-101/a_gZn-P-dmbIm membrane demonstrated a impressively high CO₂ permeability of 18670 barrer and CO₂/N₂ selectivity of 61, exceeding the CO₂/N₂ upper bound. The variable pressure (1–12 bar) and long-term stability (120 h) of the CGC membrane exhibited enhancing separation stability. Hence, the self-supported MIL-101/a_gZn-P-dmbIm membrane demonstrated effective CO₂/N₂ separation performance, which had the potential to significantly extend the scope of applications for MOF crystal-glass matrices.

由 MOF 晶体和 MOF 玻璃基质组成的 MOF 晶体-玻璃复合材料 (CGC) 膜是一种新型自支撑膜，已被有效地应用于气体分离领域。然而，典型的 MOF 玻璃基质需要较高的工作温度（400 °C），这就限制了它与具有高孔隙率和低分解率特点的多种 MOF 晶体的结合。在这项工作中，选择了 Zn-P-dmbIm（配位聚合物）作为玻璃基质，并在 190 °C 的工作温度下与具有高孔隙率的 MIL-101 晶体结合。此外，AgZn-P-dmbIm 固有的低孔隙率可以通过加入孔隙率较高的 MIL-101 来增强，MIL-101 具有较高的比表面积（从 ∼ 1.7 m2/g 到 401 m2/g）和孔隙率（从 ∼ 0.0014 cm³/g/nm 到 0.5605 cm³/g/nm）。MIL-101 和 agZn-P-dmbIm 通过原位熔化紧密结合，减少了界面缺陷，这也为有效分离 CO2/N2 提供了坚实的基础。在 CO₂/N₂（50/50，v/v）混合气体条件下，MIL-101/agZn-P-dmbIm 膜的 CO₂ 渗透率高达 18670 barrer，CO₂/N₂ 选择性为 61，超过了 CO₂/N₂ 上限。CGC 膜的可变压力（1-12 巴）和长期稳定性（120 小时）显示出更强的分离稳定性。因此，自支撑 MIL-101/agZn-P-dmbIm 膜表现出了有效的 CO₂/N₂ 分离性能，有望显著扩展 MOF 晶体玻璃基质的应用范围。

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引用次数: 0

Pattern size relative to oil droplet size effect on oil fouling in nanofiltration 相对于油滴大小的图案尺寸对纳滤中油污的影响

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-28 DOI: 10.1016/j.memsci.2024.123457

Lauren M. Ward, Catherine C. Martin, Steven T. Weinman

Membrane fouling is a major issue in many membrane applications. There are numerous methods used in attempt to mitigate membrane fouling, with one method being membrane surface patterning. However, it is still unclear how the ratio of foulant size to pattern size affects membrane fouling. In this study, we investigated constant foulant size while varying the pattern size on the membrane surface to be smaller than (300-nm), equal to (10-μm), and larger than (50-μm) the foulant (10-μm) on polyamide nanofiltration membranes. These membranes were compared to a commercial nanofiltration membrane and a control flat synthesized membrane. The membranes were tested with water, 2000 ppm Na₂SO₄, and three cycles of a n-dodecane (as oil) brine solution in a dead-end cell to assess the fouling resistance and flux recovery ability of each polyamide membrane type. From the fouling experiments, it was determined that none of the pattern sizes significantly affect the flux recovery ratio, but smaller than and larger than patterns decreased the fouling rate on the polyamide membranes by a small margin.

膜污垢是许多膜应用中的一个主要问题。有许多方法试图减轻膜污垢，其中一种方法是膜表面图案化。然而，目前还不清楚污物大小与图案大小的比例如何影响膜污垢。在这项研究中，我们研究了聚酰胺纳滤膜上恒定的污物尺寸，同时改变膜表面的图案尺寸，使其小于（300-nm）、等于（10-μm）和大于（50-μm）污物（10-μm）。这些膜与商用纳滤膜和平面合成膜对照进行了比较。在一个死端池中，用水、2000 ppm Na2SO4 和三个周期的正十二烷（作为油）盐水溶液对这些膜进行了测试，以评估每种聚酰胺膜的防污能力和通量恢复能力。从污垢实验中可以确定，所有图案尺寸都不会对通量恢复率产生明显影响，但小于和大于图案会使聚酰胺膜上的污垢率略有下降。

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引用次数: 0

Soft and highly permeable COFs nanofiltration membranes for ultrafast small organic molecules separation 用于超快小分子有机物分离的软性高渗透 COFs 纳滤膜

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-28 DOI: 10.1016/j.memsci.2024.123452

Dongru Chen , Yixuan Tang , Ning Cao , Qiuyu Miao , Yan Wang , Jinhui Pang

Covalent organic frameworks (COFs) are a novel materials platform that combines covalent connectivity, structural regularity, and molecularly precise porosity. However, COFs usually form insoluble aggregates, which limits their wide application in separation membranes. Here, we adopted “reaction-separation-assembly” strategy to produce continuous and uniform COFs membranes with controllable thickness. Our experimental data showed that the strategy can manipulate colloidal COFs suspensions to create tailored selective layer. The obtained membranes exhibited high pure water flux of 150 L m ^-2 h^-1 bar^-1, good salt/dyes separation factor and superior molecular sieving ability (> 90 % for active pharmaceutical ingredients, >97 % for dyes molecules), which is substantially higher than that of commercial NF1. In addition, the prepared composite membranes showed superior stability, especially under harsh conditions such as strong acids (4 mol L^-1 HCl) and strong bases (2 mol L^-1 NaOH). Overall, this work provides a promising approach for highly permeable and stable COFs membranes, and facilitates rapid recycling of small organic molecules such as active pharmaceutical ingredients and dyes.

共价有机框架（COFs）是一种新型材料平台，集共价连接性、结构规则性和分子精确多孔性于一身。然而，COF 通常会形成不溶性的聚集体，这限制了其在分离膜中的广泛应用。在这里，我们采用 "反应-分离-组装 "策略制备出厚度可控的连续均匀的 COFs 膜。我们的实验数据表明，该策略可以操纵 COFs 胶体悬浮液生成定制的选择性层。所制备的膜具有 150 L m -2 h-1 bar-1 的高纯水通量、良好的盐/染料分离因子和优异的分子筛分能力（对活性药物成分的筛分率为 90%，对染料分子的筛分率为 97%），大大高于商用 NF1。此外，所制备的复合膜显示出卓越的稳定性，尤其是在强酸（4 mol L-1 HCl）和强碱（2 mol L-1 NaOH）等苛刻条件下。总之，这项工作为制备高渗透性和高稳定性的 COFs 膜提供了一种前景广阔的方法，并有助于活性药物成分和染料等小分子有机物的快速回收利用。

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引用次数: 0

Wet-coating amino-functionalized PDMS interlayer boosting thin film composite membranes for efficient CO2 separation 湿涂层氨基功能化 PDMS 夹层促进薄膜复合膜用于高效分离二氧化碳

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-26 DOI: 10.1016/j.memsci.2024.123458

Zhicong Liang , Jiali Tang , Dario R. Dekel , Xuezhong He

Membrane separation is in the spotlight as one of the most cost-effective technologies without chemicals for carbon capture. This work aims to fabricate thin film composite (TFC) membranes for boosting CO₂ separation. Commercial polysulfone (PSf) flat sheet membranes pre-treated with ethanol solutions were used as support materials by coating with amino-functionalized cross-linked polydimethylsiloxane (PDMS) interlayer. It is worth noting that the developed amino-functionalized PDMS interlayer based on a novel wet-coating method to avoid the penetration of coating solution, which provides better compatibility with the coated polyamide selective layer and also the facilitated transport for CO₂ permeation. A thin CO₂-selective layer was obtained by interfacial polymerization (IP) between trimesoyl chloride (TMC) in the organic phase and diethylene glycol bis(3-aminopropyl) ether (DGBAmE or EO3) in the aqueous phase to enhance the CO₂/N₂ selectivity. Both the IP process and the membrane preparation parameters such as heat-treatment temperature, and monomer concentration were systematically optimized. It was found that the best membrane prepared with 9.9 mmol/L TMC monomer solution presents a CO₂ permeance of 81 GPU and a CO₂/N₂ selectivity of 65, which was significantly enhanced from the non-selective supports. This work provides a facile approach for tuning the TFC membrane performance for CO₂ separation and can be extended to make high-performance membranes for industrial CO₂ capture by selecting more permeable supports.

膜分离技术作为不使用化学品的最具成本效益的碳捕集技术之一备受瞩目。这项工作旨在制造薄膜复合（TFC）膜，以促进二氧化碳分离。使用乙醇溶液预处理过的商用聚砜（PSf）平板膜作为支撑材料，并在其表面涂覆氨基功能化交联聚二甲基硅氧烷（PDMS）中间膜。值得注意的是，所开发的氨基官能化 PDMS 中间膜基于一种新颖的湿涂层方法，可避免涂层溶液的渗透，从而与涂层聚酰胺选择性层具有更好的兼容性，并有利于二氧化碳的渗透传输。通过有机相中的三甲基甲酰氯（TMC）与水相中的二甘醇双（3-氨基丙基）醚（DGBAmE 或 EO3）之间的界面聚合（IP），获得了一层较薄的 CO2 选择性膜，从而提高了 CO2/N2 的选择性。对 IP 工艺和膜制备参数（如热处理温度和单体浓度）进行了系统优化。结果发现，用 9.9 mmol/L TMC 单体溶液制备的最佳膜的 CO2 渗透率为 81 GPU，CO2/N2 选择性为 65，比非选择性支撑物显著提高。这项工作为调整 TFC 膜在二氧化碳分离方面的性能提供了一种简便的方法，并可通过选择渗透性更强的支撑物扩展到用于工业二氧化碳捕获的高性能膜。

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引用次数: 0

A Ni-based metal hydroxide-organic framework mesh membrane with ultra-durable underwater superoleophobicity for high-efficient oil/water separation 具有超耐久水下超疏油性的镍基金属氢氧化物-有机框架网膜，用于高效油水分离

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-25 DOI: 10.1016/j.memsci.2024.123447

Huan Zeng , Caiqin Wu , Jialing Zhou , Chenling Yao , Guilong Li , Chuanghui Yu , Jian Wang , Hua Dong , Zhe Xu , Lei Jiang

Recently, MOF-based oil/water separation membranes with superwettability have attracted great attention in the treatment of oily wastewater due to their uniform chemical composition and intrinsic porosity. However, the real separation performance is still limited by broking the metal-ligand bonds of conventional MOF materials in extreme chemical and mechanical environments, such as acidic, alkaline, saline, organic, and abrasion. Herein, we provide a metal hydroxide-organic framework (MHOF) composite mesh membrane for high-efficient oil/water separation by simply growing Ni₂(OH)₂ clusters onto a polydopamine (PDA)-modified stainless-steel mesh (SSM). Compared with conventional MOF materials, our membrane possesses ultra-durable underwater superoleophobicity by taking advantages of its strong chemical bridging, rich hydrophilic groups, and rough surface morphology, which enables a 1 μL water droplet to spread to 0° contact angle within <100 ms and also obtains an ultra-low underwater oil adhesion force ∼1.9 μN. Separation of both oil/water mixtures and oil-in-water emulsions can be achieved by this Ni-based MHOF mesh membrane with high separation efficiency >99.7 % and large permeate flux >57,000 L m⁻² h⁻¹. Furthermore, the Ni₂(OH)₂@PDA-SSM mesh membrane exhibits excellent anti-oil-fouling, chemical stability and abrasion resistance, which shows a promising candidate for practical applications. This study provides a rational strategy to construct high-performance MHOF membranes for oil/water separation.

近来，具有超润湿性的 MOF 基油水分离膜因其化学成分均匀、固有孔隙率高而在含油废水处理领域备受关注。然而，在酸性、碱性、盐溶液、有机物和磨损等极端化学和机械环境下，传统 MOF 材料的金属配位键断裂，其实际分离性能仍然受到限制。在此，我们通过在聚多巴胺（PDA）改性不锈钢网（SSM）上简单地生长 Ni2(OH)2 簇，提供了一种用于高效油水分离的金属氢氧化物-有机框架（MHOF）复合网膜。与传统的 MOF 材料相比，我们的膜利用其强化学架桥、丰富的亲水基团和粗糙的表面形态等优势，具有超持久的水下超疏水性，可使 1 μL 的水滴在 <100 毫秒内扩散到 0° 接触角，同时还获得了 1.9 μN 的超低水下油附着力。这种镍基 MHOF 网膜可实现油水混合物和水包油乳状液的分离，分离效率高达 99.7 %，渗透通量大达 57,000 L m-2 h-1。此外，Ni2(OH)2@PDA-SSM 网膜还表现出优异的抗油污性、化学稳定性和耐磨性，具有良好的实际应用前景。这项研究为构建用于油/水分离的高性能 MHOF 膜提供了一种合理的策略。

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引用次数: 0

Self-assembled nanoflower-mediated interfacial polymerization through tunable intra- and inter-layer channels to boost total heat exchange performance 通过可调的层内和层间通道实现自组装纳米花介导的界面聚合，从而提高总热交换性能

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-24 DOI: 10.1016/j.memsci.2024.123448

Chao Chen , Lingping Luo , Shijian Song , Yan Chen , Juexin Wang , Congjie Gao , Fei Huang , Lixin Xue

Total heat exchange membranes (THEMs) are vital for minimizing energy consumption and enhancing indoor air quality in energy recovery ventilation (ERV) systems. Manipulating the surface morphology of polyamide (PA) membranes via nanofiller-mediated interfacial polymerization is key to advancing total heat recovery performance. This study presented the fabrication of PA thin-film nanocomposite (TFN) membranes by integrating self-assembled poly(amic acid-imide) nanoflowers (P(AA-I)-NFs) with intertwined nanosheets into the organic phase. This facile approach effectively eliminated nonselective interphase voids and defects, owing to the superior polymer affinity of the organic nanoflowers. The finely tuned intra- and inter-layer channels within P(AA-I)-NFs significantly impacted monomer mass transfer, facilitated the shuttle effect, expanded the interfacial polymerization zone, and led to the formation of a rougher, thicker PA layer with enhanced surface area. The optimized P(AA-I)-NFs/PA TFN membranes exhibited outstanding performance, including CO₂ permeability of 0.51 GPU, water vapor permeability of 656.59 GPU, and an enthalpy exchange efficiency of 71.47 %, surpassing the trade-off limitations typically observed in commercial and other advanced THEMs. These findings underscored the potential of P(AA-I)-NFs-mediated TFN membranes as highly competitive candidates for next-generation ERV systems.

在能量回收通风系统（ERV）中，全热交换膜（THEMs）对于最大限度地降低能耗和提高室内空气质量至关重要。通过纳米填料介导的界面聚合来操纵聚酰胺（PA）膜的表面形态是提高全热回收性能的关键。本研究介绍了通过将自组装聚（AA-I）纳米流（P(AA-I)-NFs）与相互交织的纳米片整合到有机相中来制造聚酰胺薄膜纳米复合材料（TFN）膜。由于有机纳米花具有优异的聚合物亲和性，这种简便的方法有效地消除了非选择性相间空隙和缺陷。P(AA-I)-NFs 中经过微调的层内和层间通道极大地影响了单体的传质，促进了穿梭效应，扩大了界面聚合区，并形成了具有更大表面积的更粗糙、更厚的 PA 层。优化后的 P（AA-I）-NFs/PA TFN 膜表现出卓越的性能，包括 0.51 GPU 的 CO₂渗透率、656.59 GPU 的水蒸气渗透率和 71.47 % 的焓交换效率，超越了通常在商业和其他先进 THEM 中观察到的权衡限制。这些发现凸显了 P（AA-I）-NFs 介导的 TFN 膜作为下一代 ERV 系统极具竞争力的候选材料的潜力。

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引用次数: 0

Multi-hierarchical structured PTFE membrane for liquid desiccant dewatering via membrane distillation 通过膜蒸馏进行液体干燥剂脱水的多层结构聚四氟乙烯膜

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-24 DOI: 10.1016/j.memsci.2024.123449

Yan Huang , Guangyong Zhang , Zijie Xu , Xiantong Zhao , Wenqi Xie , Luyao Wang , Zhe Zhai , Jie Liu , Shuaifei Zhao , Yuchao Zhao

Poly (tetrafluoroethylene) (PTFE) can be used for robust separation membranes owing to its exceptional chemical and thermal stabilities. Simultaneously achieving construction of hierarchical pore structures and re-entrant surface microstructures during the fabrication of PTFE membrane holds significant importance in addressing the issues of low flux and membrane wetting in membrane distillation (MD). Herein, we proposed a flexible method for manufacturing hierarchically structured PTFE membrane by combining electrospinning/spraying with sintering/welding. The present approach facilitated the controlled fabrication of a superhydrophobic PTFE membrane with slippery surface (exhibiting a water contact angle of 153.5°, and an ultralow sliding angle of 7.5°) without using fluoride-based solvents or external nanoparticles. Moreover, the anti-wetting mechanism and performance stability of the PTFE membranes in MD were thoroughly investigated. In liquid desiccant regeneration experiments, the 20 wt% LiCl solution was successfully concentrated to 28.64 wt%. Furthermore, the PTFE membrane demonstrated a stable flux (>30 kg m⁻² h⁻¹) and relatively low permeate conductivity (<15 μs cm⁻¹) during treating simulated seawater for 30 h. The present work offers a new approach to fabricate multi-hierarchical structured superhydrophobic membranes for desalination and regeneration of liquid desiccants.

聚四氟乙烯（PTFE）具有优异的化学和热稳定性，可用于制造坚固的分离膜。在制造聚四氟乙烯膜的过程中，同时构建分层孔隙结构和重入式表面微结构对于解决膜蒸馏（MD）中的低通量和膜润湿问题具有重要意义。在此，我们提出了一种结合电纺丝/喷射和烧结/焊接的灵活方法来制造分层结构的聚四氟乙烯膜。该方法无需使用含氟溶剂或外部纳米粒子，即可控制制造出表面光滑的超疏水聚四氟乙烯膜（水接触角为 153.5°，超低滑动角为 7.5°）。此外，还深入研究了聚四氟乙烯膜在 MD 中的防湿机制和性能稳定性。在液体干燥剂再生实验中，20 wt% 的氯化锂溶液成功浓缩至 28.64 wt%。此外，在处理模拟海水 30 小时的过程中，聚四氟乙烯膜表现出了稳定的通量（30 kg m-2 h-1）和相对较低的渗透电导率（15 μs cm-1）。本研究为制造用于脱盐和液体干燥剂再生的多层结构超疏水膜提供了一种新方法。

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引用次数: 0

A novel TFNi pervaporation membrane with g-C3N4 quantum dots for high-efficiency IPA dehydration 带有 g-C3N4 量子点的新型 TFNi 渗透膜用于高效 IPA 脱水

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science

Pub Date : 2024-10-24 DOI: 10.1016/j.memsci.2024.123451

Jia-Rui Yang, Yu-Fei Lin, Zhen-Liang Xu, Rui Jia, Yin-Xin Fang

Pervaporation (PV) shows significant potential for the highly selective isopropanol (IPA). The pursuit of developing PV membranes with outstanding separation effect and enduring high purity permeation is an indispensable goal. Based on polyamide (PA) separation layers, a polydopamine (PDA) mixed g-C₃N₄ quantum dots (gCNQDs) coating as the interlayer was deposited onto a porous ceramic hollow fiber substrate to fabricate thin-film nanocomposite membranes with an interlayer (TFNi). The nanocomposite interlayer enabled the formation of a smoother and highly separated selective polyamide layer. The separation factor exhibited a 31-fold enhancement with the augmentation of the blending fraction of gCNQDs during the PDA coating process. The resulting TFNi membrane attained an exceedingly high separation factor of 10270 ± 90 with a permeate water concentration of 99.9 % and demonstrated a satisfactory flux of 1.40 ± 0.08 kg m⁻² h⁻¹ during the PV process of 90 wt% IPA dehydration at 60 °C. This study presents a fresh perspective on the implementation of nanocomposite interlayers, which is expected to expand the application of high-performance TFNi membranes in PV dehydration processes.

渗透（PV）技术在高选择性异丙醇（IPA）方面显示出巨大潜力。开发具有出色分离效果和持久高纯度渗透性的 PV 膜是一个不可或缺的目标。在聚酰胺（PA）分离层的基础上，将聚多巴胺（PDA）混合 g-C3N4 量子点（gCNQDs）涂层作为中间层沉积在多孔陶瓷中空纤维基底上，制备出带有中间层（TFNi）的薄膜纳米复合膜。纳米复合中间层能够形成更平滑、高度分离的选择性聚酰胺层。在 PDA 涂层过程中，随着 gCNQDs 混合比例的增加，分离因子提高了 31 倍。所制备的 TFNi 膜在渗透水浓度为 99.9% 的情况下达到了 10270 ± 90 的超高分离因子，在 60 °C 下 90 wt% IPA 脱水的 PV 过程中，通量达到了令人满意的 1.40 ± 0.08 kg m-2 h-1。这项研究为纳米复合夹层的应用提供了一个全新的视角，有望扩大高性能 TFNi 膜在光伏脱水工艺中的应用。

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