Materials Today Chemistry
·
2025
·
IF 6.7
Peixia Zhao,Yafang Hou,Weilin Chen,Wenju Liu,Yanmin Shen,Shuling Guo,Hengjian Jie,Fan Zhang,Yatao Zhang,Carmine D'Agostino
Covalent organic frameworks (COFs) are promising materials for fabrication of defect-free membranes due to their compatibility with polymers. However, harsh synthesis conditions and the use of toxic reagents hinder their practical applications. In this work, a green in-situ interfacial polymerization strategy was developed to fabricate COF/HPAN composite membranes, with ethyl acetate (EA) used as a solvent to replace toxic dichloromethane (DCM). A self-standing COF membrane was prepared via the Schiff-base reaction of m -phenylenediamine (MPD) and benzene-1,3,5-tricarboxaldehyde (TFB), and its crystal structure was characterized to confirm successful synthesis. The resulting membranes demonstrated ultrahigh permeability (462.8 L m −2 h −1 bar −1 ) at a low operating pressure (1 bar), 99% rejection for Congo Red (CR), Methyl Blue (MB) and Methylene Blue (MeB), low rejection of salts (less than 20% for NaCl, MgCl 2 , MgSO 4 and Na 2 SO 4 ), and excellent antifouling performance (a flux recovery rate of 98.7%). This study provides a sustainable strategy for efficient dye/salt separation, which sets an important benchmark for the preparation of next-generation green nanofiltration membranes for industrial applications.
研究领域:
材料科学
·
环境工程
·
膜技术
·
绿色化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
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 % Na 2 SO 4 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.
研究领域:
材料科学
·
膜技术
·
环境工程
·
高分子化学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Siqi Wang,Pengjie Xu,Yi Feng,Ziyi Yuan,Weihua Xu,Yanling Liu,Shengji Xia
Nanofiltration (NF) is increasingly used in water treatment for its high membrane fouling issues. Alkaline chemical cleaning is generally applied to mitigate organic fouling of NF membranes, while the role of temperature in governing the cleaning process has not yet been systematically elucidated. This study compared the fouling behaviors of four organic model foulants on NF membranes, and evaluated the impact of alkaline cleaning temperatures (pH 11, 10–55 °C) through measurements of membrane flux recovery and characterizations of residual foulants after cleaning. Results showed that for the fouling solely by three negatively charged foulants (fulvic acid, bovine serum albumin, and sodium alginate), membrane cleaning temperature at 25 °C was basically effective, while a higher temperature like 40 °C was more advantageous in multiple cycles of fouling and cleaning. The positively charged lysozyme caused the most severe irreversible fouling that could not be removed by alkaline cleaning. For the composite fouling jointly caused by various foulants, the chemical cleaning efficiency was lower compared to that for the single foulants, implying the need to develop enhanced cleaning approaches during long-term operations. This study highlights the significance of chemical cleaning temperatures during membrane fouling control, offering implications for practical engineering applications.
研究领域:
环境工程
·
膜技术
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Qingping Xin,Zhaoqi Qu,Xinghui Zhang,Xingwei Wang,Jiaxin Wu,Dengdi Wu,Wei Huang,Mengke Wang,Ningning Gao,Xiaoli Ding,Yuzhong Zhang
Composite membranes, which consist of a multi-layer membrane structure comprising an ultra-thin dense separation layer and a porous support layer, are used for gas separation. However, issues such as poor adhesion between layers often arise. In this study, a novel reverse-induced diffusion method was employed to achieve the in situ growth of a covalent organic framework COF (TaPa-1) on one side of polyacrylonitrile (PAN) at room temperature, resulting in the formation of a tightly bonded gutter layer. Subsequently, a metal-organic framework MOF (NH 2 -ZIF-8) was secondarily grown in situ on the TaPa-1 membrane to prepare a PAN/COF-MOF composite membrane with stable interlayer bonding. The TaPa-1 layer, with high gas permeability, and the NH 2 -ZIF-8 layer due to sheltering effect, with high gas selectivity, act synergistically to enable efficient gas sieving and rapid transport. When treating simulated flue gas (CO₂/N₂ = 1:4), the gas separation selectivity of the PAN/COF-MOF composite membrane reach 29.9, with a CO₂ permeability of 825 GPU, achieving excellent CO₂ separation performance. In this study, the PAN/COF-MOF composite membrane is constructed using the reverse-induced diffusion method, achieving stable interlayer bonding and synergistic separation, demonstrating excellent CO₂ permeability and selectivity.
研究领域:
材料科学
·
膜技术
·
气体分离
·
可持续能源
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Tanzila Anjum,Hammad Saulat,Gianni Olguin,David K. Wang,Xiaozhen Zhang,Xiaonan Kou,Xian Yin,Asim Laeeq Khan,Guozhao Ji
Hydrogen is a promising substitute for fossil fuels because it has a high calorific value and is eco-friendly. Cobalt-doped silica membranes, suitable for separating hydrogen from other larger molecular gases at high temperatures, are commonly fabricated by the dip-coating method, followed by evaporation drying and calcination. However, these membranes suffer from defects within selective layers, reducing the separation efficiency by allowing non-selective permeation. These defects can be ascribed to surface tension effects during evaporation drying, where the imbalance between liquid-phase cohesion and adhesive interactions with the solid substrate leads to non-uniform solvent evaporation, resulting in stress accumulation, capillary forces, and eventual structural imperfections such as cracks and pinholes. In this study, a novel freeze-drying technique is introduced to minimize defects in cobalt-silica membranes by avoiding surface tension. For this purpose, α-alumina substrates were selected, and a zeolite interlayer was formed on the substrate, which provided the pore size transition to fabricate cobalt-doped silica separation membranes. The structural and morphological analyses confirm the effectiveness of the freeze-drying technique, revealing a higher silica condensation, increased amorphous character, smoother surfaces, homogeneous cobalt dispersion with the presence of Co3+, and uniform, smaller pore sizes, outperforming the evaporation-dried technique in terms of separation efficiency and indicating fewer defects. At 500 °C, the freeze-dried membrane showed almost three times higher H2/N2 and H2/CO2 selectivity than the conventional evaporation-dried membrane. The novel freeze-drying technique showed a promising potential for H2 separation applications at high temperatures.
研究领域:
材料科学
·
膜技术
·
氢能
·
分离过程
·
纳米材料
·
陶瓷膜
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Zhuo Zhao,Haojiong Sun,Siting Li,Miaomiao Gu,Wenzhuang Hu,Hongyu Wang,Guoliang Yang,Jing Wang,Weiyu Dou
Bilirubin, a potent endogenous toxin, can cause irreversible damage to the brain and nervous system. To address this, we developed a novel polydopamine/polyethylenimine (PDA/PEI)-functionalized polyester fiber (PDA/PEI–PF) membrane capable of plasma separation and bilirubin adsorption properties. The surface macropores of the PDA/PEI–PF membrane were filled with PDA particles, followed by PEI grafting to generate a positive charge. The optimized PDA/PEI–PF membrane exhibited acceptable plasma permeance of ∼2.5 L m–2 h–1 for diluted blood, along with a high cell retention rate (∼90%), a low hemolysis rate (∼2.7%), and excellent blood compatibility (hemolysis rate, ∼0.3%). Additionally, the bilirubin retention capacity of the PDA/PEI–PF membrane can reach 68.56 μg cm–2 and 270.33 μg cm–2 for static and dynamic adsorption processes, respectively. The novel “screening–adsorption” membrane prepared in this study may streamline traditional blood perfusion therapy, demonstrating significant potential for clinical applications.
研究领域:
生物医学工程
·
血液灌流治疗
·
生物材料
·
毒素清除
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Yuyan Lai,Yuan Liu,Junsheng Yang,Linkun Cai,Wei Xu,Hongjun Zhang,Panchao Yin
Polymers have been broadly applied in the gas separation industry for their excellent processability and mechanical performance; however, the intrinsic tradeoff between gas permeability and selectivity defines their low efficiency for gas separation. Herein, the frustrated packing of hairy nanoparticles (HNs) is applied for the fabrication of gas separation membranes. Poly (propylene glycol) (PPG) is covalently grafted on the surface of the 2.5 nm microporous coordination nanocages (CNCs) with predefined high grafting densities. By precisely tunning the M w , the grafted PPG demonstrates enhanced rigidity due to the spatial nanoconfinement from the grafted neighbors, and this imposes the frustrated packing of the polymer fragments in the interstitial area among the HNs. The generated extra free volume and extrinsic microporosity can be confirmed from positron annihilation life spectroscopic studies, and it contributes to the interconnection of the intrinsic micropores of CNCs for a gas permeation framework. Meanwhile, the HN unit inherits the mechanical property from the grafted polymers and can be processed into flexible membranes that finally achieve H 2 /CO 2 separation performance above the Robeson upper bound. The work reveals the microscopic mechanism for the control of frustrated packing and moreover, opens new avenues to the feasible fabrication of high-performance gas separation membranes.
研究领域:
材料科学
·
纳米技术
·
气体分离
·
高分子化学
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Leyang Deng,Yongqiang Lan,Jingru Lv,Jiaxing Chen,Yanhong Zhang,Ping Peng
This study reports the development of ethanol-selective composite membranes for pervaporation (PV) based on polydimethylsiloxane (PDMS) embedded with reduced graphene oxide@silica core-shell (GSCS) particles. To enhance interfacial compatibility and particle dispersion within the matrix, 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FDTS) was immobilized onto the GSCS to entangle with PDMS chains. A pre-polymerization strategy was adopted to increase the viscosity of the casting suspension, facilitating higher filler loading and improved ethanol separation performance. Optimal separation performance was achieved with a casting solution viscosity of 4 Pa s, yielding a maximum selectivity of 3.94. The scanning electron microscope (SEM) confirmed the formation of smooth defect-free PDMS/FDTS-GSCS composite membranes. The PV testing of these membranes demonstrated a high separation factor of 11.03 and a permeation flux of 242 g m −2 h −1 for separating a 10 wt% ethanol/water mixture at 40°C. Critically, the composite membranes exhibited excellent operational stability over a continuous 168-h test period. These findings indicate that incorporating FDTS-modified GSCS into PDMS significantly enhances ethanol selectivity, highlighting the potential of these membranes for bioethanol recovery applications.
研究领域:
材料科学
·
膜技术
·
化学工程
·
分离过程
·
纳米复合材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yifan Wu,Panpan Zhang,Xi Chen,Xushuai Chen,Chunjia Luo,Min Chao,Luke Yan
Nanofiltration (NF) membranes are critical for seawater desalination, wastewater treatment, and ion separation. However, conventional polyamide membranes suffer from irreversible damage, resulting in performance decline and increased operational costs. Developing self-healing PA-based NF membranes remains a major challenge. Herein, we fabricate a high-permeability, self-healing NF membrane via interfacial polymerization (IP) using thermally reversible Diels–Alder (DA) bonds to enable damage recovery. A furan-functionalized polyethylenimine was synthesized as the aqueous monomer, whereas 6-maleimidohexanoyl chloride and trimesoyl chloride served as organic monomers. During IP, acyl chloride formed robust amide bonds with amines, while DA reactions between maleimide and furan groups enabled self-healing. The membrane achieved a water flux of 36.5 L m–2 h–1, >95% Na2SO4 rejection, and with a molecular weight cutoff (MWCO) of 561 Da. After thermal repair, the damaged membrane recovered 88% Na2SO4 rejection, and the MWCO is maintained at 857 Da. This work presents a promising strategy to improve the performance and durability of PA NF membranes.
研究领域:
材料科学
·
膜技术
·
环境工程
·
高分子化学
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zhen Li,Jingyi Wu,Weixuan Li,Shiyao Sun,Qianlong Wang,Jialin Zhao,Yijia Lei,Na Li,Jiayao Yang,Yuchao Wang,Zhe Wang
Anion exchange membranes (AEMs), as the core component of anion exchange membranes fuel cells (AEMFCs), exhibit high OH– conductivity and dimensional stability, which are critical for continuous and stable power generation. In this paper, the synthesis of 6,6′-dimethoxy-3,3,3′,3′-tetramethyl-1,1′-spirobiindane (SBI) was introduced, and it was synthesized to prepare a series of fluorinated poly(aryl piperidinium) microporous AEMs (QFPTP-SBI-m). The thermodynamic incompatibility in the polymer drives the formation of the microphase separation structure. The hydrophobic regions can restrict the swelling of the membrane, and the hydrophilic regions serve as ion transport channels. Additionally, the introduction of SBI monomers increases the free volume between the chains and reduces the transport resistance. The synergistic effect of microphase separation and free volume is utilized to regulate the properties of the AEMs. QFPTP-SBI-20% exhibited high OH– conductivity (197.53 mS cm–1), and the peak power density (PPD) reached 1.08 W cm–2 at a current density of 2.5 A cm–2. The WU of 41.36% and SR of 15.99% at 80 °C ensure good dimensional stability. Furthermore, the OH– conductivity was reduced by 8.71% after 1700 h (3 M NaOH). The prepared QFPTP-SBI-20% area exceeded 140 cm2, indicating its significant potential for large-scale applications.
研究领域:
材料科学
·
高分子化学
·
能源工程
·
燃料电池
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Hong Li,Yuanyuan Feng,Jingde Li,Yanqin Yang
Efficient CO2 capture, demonstrating significant potential in reducing excessive carbon emissions and advancing carbon neutrality, is crucial for advancing carbon capture, utilization, and storage (CCUS) technology. Membrane technology is environmentally friendly and energy-saving for CO2 capture. Mixed matrix membranes (MMMs) consisting of polymers of intrinsic microporosity (PIMs)-grafted composite fillers and PIM matrices are promising for gas separation. However, conventional two-phase MMMs often face a fundamental challenge: the trade-off between permeability and selectivity, coupled with nonselective interfacial defects arising from poor compatibility between the polymer matrix and fillers. Moreover, the synthesis of composite fillers is usually complex and highly dependent on the reasonable matching of fillers and grafted polymers, restraining the wide application of this material system. To fundamentally address this issue of interfacial compatibility, we focused on designing a distinct third phase at the interface. Herein, we report a concept of polymer–filler–polymer ternary-phase MMMs (TMMMs) for efficient CO2 separation. The key point is that the membrane system consists of a PIM matrix, filler, and a functionalized PIM-type third component. As the functionalized PIMs selected can form strong interactions with both fillers and PIM matrices, they can work as a molecular bridge between two phases, diminishing the generation of nonselective interfacial defects. Meanwhile, the functionalized PIMs’ incorporation can increase the quantity of CO2 adsorption sites as well as facilitate the formation of a porous network structure between filler and matrix phases, making the performance improvement of the resultant membranes foreseeable. Particularly, the representative ternary membrane made from 3D-COF (filler, 5 wt %), PIM-1 (matrix), and carboxylated PIM-1 (cPIM-1, third component, 1 wt %) exhibits significantly improved CO2 permeability of 9560 Barrer, CO2/N2 selectivity of 22.7, and antiaging performance in comparison to the pure PIM-1 membrane and PIM-1/3D-COF binary membrane. We believe that this concept proposed here offers an alternative way to produce defect-free and high-performing PIM-based MMMs for CO2 capture and other separations.
研究领域:
材料科学
·
膜技术
·
碳捕集与封存
·
高分子化学
·
气体分离
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Zenghui Xie,Jiana Lin,Yuling Hu,Gongke Li
Covalent organic frameworks (COFs) provide an exceptional platform for creating nanochannels with different pore environments and customized functionalities. However, precisely tuning the pore size and geometry of COF nanochannels and making them selectively recognizable are fraught with challenges. Herein, we present a macrocycle-driven pore segmentation strategy to construct COF nanochannels with precisely confined cavities, enabling highly efficient and enantioselective transmembrane transport. By employing calix[4]arene and calix[6]arene as building blocks, we fabricated calixarene-based COF nanochannels with tetragonal and hexagonal symmetries in the AA stacking mode. This design enabled the precise regulation of pore size and functionality, thereby creating tailor-made confined environments ideal for chiral separation. β-Cyclodextrin was subsequently anchored to the pore wall of the nanochannels via a “click” reaction to construct a chiral microenvironment. The mixed matrix membranes based on chiral COFs were further prepared, which exhibited remarkable selective transmembrane recognition and transport of D/L-tryptophan with enantiomer excess values approaching 100%, a notable advancement in membrane-based chiral separation. The intrinsic relationship between the crystal structure and pore structure of calixarene-based COFs and their selective recognition capabilities of amino acids was explored. This study facilitates the precise design and construction of macrocyclic-based COF artificial nanochannels, enabling the selective recognition and precise regulation of nanochannel pore structures and microenvironments.
研究领域:
材料科学
·
超分子化学
·
膜技术
·
手性分离
·
纳米流体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）