JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Zhipeng Liao,Tongqing Gao,Junxiong Zhang,Qiong Wu,Jian Shi,Zhaohang Yang,Changjin Ou
Nanofiltraion (NF) membranes are promising candidates for overcoming critical global issues of access to clean water. However, current NF membranes are hampered by the trade-off between the water permeability and selectivity as well as the fouling propensity. In this work, a facile surface decoration simultaneously combined with solvent activation strategy was adopted for the NF membrane modification via simply immersing membrane into the polyoxometalates (POMs) ethanol solution. The introduction of POMs by coordination assembly increases the membrane hydrophilic and electronegativity , and the ethanol loosens the membrane selective layer, leading to the enhanced membrane perm-selectivity and anti-organic fouling property. The permeance and Na 2 SO 4 rejection of the optimized modified NF membrane are 14.90 ± 0.21 LMH/bar and 99.20 ± 0.38 %, which are ∼20 % and more than 3 % increments compared with those of the control membrane, respectively. The modified NF also reveals a lower permeance decline as well as a higher flux recovery toward both positive and negative charged foulants. In addition, benefiting from the biocidal activity of the POMs, the membrane anti-biofouling property is also significantly improved under an extremely low loading of POMs. More importantly, the chemical stability of the modified NF membrane is reinforced due to the protection from the introduced POMs. Our work contributes to revitalizing the prospect of developing NF membranes with excellent filtration performance and antifouling property.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Juexin Wang,Yangxiang Huang,Lixin Xue,Xinqi Gu,Jing He,Yeqiang Lu,Congjie Gao
Cross substrate interface polymerization (CSIP) processes were developed to construct polyethylene (PE) based thin film composite nanofiltration (NF) membranes with internally confined polyamide (i-PA) separating layers protected by external covering PE filaments, possessing rougher top surfaces, more negative surface zeta potential, reduced and narrowly distributed pore sizes. Cationic surfactant CTAB reacted with TMC and formed hydrophilic but insoluble BTC(CTA) n /CTAB coating inside the PE substrate to facilitate water permeation. The contact time of monomer solutions on PE substrates affect the membrane performance by controlling the quality of i-PA layers and amount of BTC(CTA) n /CTAB coating underneath. PE(O/W) NF membranes from CSIP processes with i-PA layers had rougher surface, lower zeta potential, smaller average radius μ p (0.374 nm) and lower geometric deviation (1.43), leading to higher Na 2 SO 4 rejection (96.4 %) and water permeance (20.36 L m −2 ·h −1 ·bar −1 ), maintaining excellent anti-wearing, flux recovering and operating stability.
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LANGMUIR
·
2024
·
IF 3.7
Yu Fang,Cheng-Ye Zhu,Xiao Han,Zhao-Yu Ma,Hao-Cheng Yang,Chao Zhang,Hong-Qing Liang,Xuan Yang,Zhi-Kang Xu
The interlayer strategy has emerged as an effective approach for modulating the interfacial polymerization process and improving the permeability and selectivity of polyamide membranes. However, the underlying mechanisms by which charged interlayers influence the interfacial polymerization process remain inadequately understood. In this study, we utilized two distinct charged cellulose nanofibers, namely, carboxylated cellulose (⊖-CNF) and quaternized cellulose (-CNF), as interlayers to regulate the interfacial polymerization process. Through simulation results, isothermal titration calorimetry (ITC) and UV tests, we demonstrated that the -CNF interlayer, which possesses stronger hydration capability and better piperazine affinity, enhanced the diffusion of piperazine across the reaction interface compared with the ⊖-CNF interlayer. This led to an acceleration of the interfacial polymerization process and the formation of a denser membrane structure. Further investigation revealed that the charged interlayers significantly influenced the surface charging properties of the resulting nanofiltration membranes within a 30 nm range of electrostatic effects. Specifically, the ⊖-CNF interlayer conferred a higher negative charge to the membrane surface, while the -CNF interlayer endowed the membranes with a lower surface negative charge. Leveraging these differences, the ⊖-i-TFC membranes exhibited exceptional separation performance for divalent anions, achieving a SO42–/Cl– selectivity of 136. Conversely, the -i-TFC membrane demonstrated an enhanced separation of divalent cations, displaying a Mg2+/Na+ selectivity of 3.5. This study lays the groundwork for regulating the surface charging properties of polyamide membranes, offering potential advancements in nanofiltration applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Wan-Long Li,Xiao-Wei Luo,Wan-Ting Lin,Si-Yuan Zhang,Zi-Lu Zhang,Zi-Jun Zhang,Zhi-Kang Xu,Ling-Shu Wan
Traditional polyamide nanofiltration (NF) membranes are not applicable to high-temperature separation because of insufficient thermal stability. Modulation of the interfacial polymerization process is effective in improving the high-temperature separation performance of NF membranes. Herein, we introduce an interfacial polymerization strategy modulated with acid acceptors to prevent HCl, a byproduct in interfacial polymerization, from protonating amine monomers, and hence increase the compactness and thermal stability of the polyamide selective layers. The thickness, water contact angles, and charge properties were investigated. The optimized NF membranes show high-temperature separation performance with 97.7 % rejection to MgSO 4 and 24.4 L·m −2 ·h −1 ·bar −1 of permeance at 85 °C. The membranes also exhibit thermally stable separation performance at different salt concentrations, applied pressure, cycling temperature variations, and 100-h long-term operations. This study presents an inspiring method for preparing thermostable polyamide membranes.
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WATER RESEARCH
·
2025
·
IF 12.4
Kuiling Li,Jiayue Qin,Hang Song,Yong Zhang,Lili Xu,Huazhang Zhao,Dan Qu,Jun Wang
Membrane stripping is a promising method for ammonia removal/recovery from industrial wastewater, whereas, its application in treating coking wastewater is restricted by severe membrane fouling and wetting problems. Aiming at the challenges on applying interfacial polymerization on batch modification of hollow fiber membrane, this study come up with a novel in-membrane-module interfacial polymerization method. By flowing the aqueous and oil phases into the shell and lumen sides respectively, a hydrophilic nanoporous layer was constructed on the outer surface of hollow fiber membranes, obtaining a fouling- and wetting-resistant Janus membrane. The optimized Janus membrane demonstrated strong anti-wetting performance against surfactants for 14 days. 3600 hollow fibers in a 2-inch commercial membrane contactor were successfully modified in batch, and showed excellent anti-fouling properties when treating actual coking wastewater for over 80 days. In summary, this Janus membrane is highly beneficial for promoting the practical application of membrane stripping of ammonia from industrial wastewater across various fields.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Juan Chai,Haoxue Lu,Yan Xia,Juan Li,Zhenghong Guo,Zhengping Fang
Polypropylene (PP) is now widely used in various parts of automotive manufacturing, but pure polypropylene cannot meet the performance requirements and safe use requirements. The aim of this work is to design a flame-retardant system of halogen-free flame retardant for polypropylene that meets the requirements of flame retardant safety. The flame-retardant system with Piperazine pyrophosphate (PAPP), Melamine polyphosphate (MPP) and Ce based metallo-organic compound (Ce-CP) was selected by controlling different content ratios, and its flame retardancy and mechanical properties were studied. The results show that Ce-CP, as an anti-dripping agent, can be applied at a low addition for suppressing the melt dripping of PP. When the mass fractions of PAPP, MPP, and Ce-CP are 14.6%, 4.9%, and 2.5%, respectively, the limiting oxygen index of PP can be increased to 27%, and the vertical combustion grade UL-94 can reach V-0 level.
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CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Jie Zhang,Jiahui Shi,Qiubo Yang,Haogang Guo,Lingfeng Guo,Guoliang Zhou,Yinyi Liu,Xiaolei Wang,Xian Hao,Yifei Yang
Parkinson's disease (PD), a neurodegenerative disorder characterized by the depletion of dopaminergic neurons, has conventionally been managed through pharmacological intervention and deep brain stimulation (DBS) surgery. However, drug resistance and the risks of surgical implantation have hindered the effective of current treatment. Herein, we endeavor to engineer a wireless, non-invasive nanoplatform for electrostimulation-enhanced drug therapy, termed BCFO@LCM. This innovative platform integrates magnetoelectric nanomaterials (BaTiO 3 -CoFe 2 O 4 ) encapsulated within BV2 cell membranes (CM), enabling traversal of the blood-brain barrier (BBB) and dual-targeting of the PD microenvironment through magnetic and membrane fusion mechanisms. When exposed to an external magnetic field, this system facilitates the controlled release of the therapeutic agent L-DOPA for pharmacotherapy, concurrently generating electrical signals via the magnetoelectric nanomaterials to effectuate neuromodulation. Our findings reveal that BCFO@LCM markedly ameliorates dyskinesia in PD model mice, diminishes the attrition of dopaminergic neurons in the substantia nigra and striatum, augments tyrosine hydroxylase levels, and ultimately reverses the damage to dopaminergic neurons. Furthermore, the non-invasive electrical stimulation enhances neuronal activity within deep brain tissues and fosters the regeneration and differentiation of neurons.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Rui Zhang,Qiang Ma,Xugang Song,Hailong Wang,Xiaoxiao Duan,Yongsheng Ren
In recent years, Janus membranes have gained increasing attention for their application in membrane distillation (MD) technology. In this study, PVDF composite membranes doped with varying concentrations of MnO 2 nanoparticles were fabricated as support layers using the non-solvent induced phase separation (NIPS) method. Subsequently, a polyamide (PA) layer was deposited on the membrane surface via reverse interfacial polymerization (RIP), resulting in the formation of Janus membranes with catalytic self-cleaning capabilities. As the MnO 2 content increased, the permeation flux of the pristine PVDF composite membranes gradually decreased from 31.3 ± 1.2 LMH to 28.3 ± 1.9 LMH and further to 22.7 ± 0.6 LMH. Nevertheless, the incorporation of the hydrophilic PA layer significantly enhanced the permeation performance, with the flux increasing to 34.9 ± 1.2 LMH, 30.9 ± 0.5 LMH, and 26.2 ± 0.5 LMH, respectively. Additionally, the Janus membrane exhibited excellent wetting and fouling resistance in environments with sodium dodecyl sulfate (SDS) and calcium sulfate scale. The catalytic self-cleaning functionality enables the membrane to be repeatedly utilized in cyclic operations. These findings suggest that the Janus membrane holds significant promise for practical applications in membrane distillation processes.
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DESALINATION
·
2025
·
IF 9.8
Xue-Ting Zhai,Xiao-Wei Wu,Fangang Meng,Yuanyuan Zhang,Yu-Xi Huang
The nanofiltration (NF) is a promising dye/salt separation technology for dye-containing wastewater reclamation. However, the membrane permeability and selectivity trade-off is still a critical issue for the conventional thin-film composite (TFC) membranes. This study investigates the fabrication and application of MAF-6-based NF membranes for efficient dye/salt separation. MAF-6 nanoparticles were synthesized using a rapid solution mixing method and incorporated into the polyamide (PA) layer of TFC membranes. The resulting thin-film nanocomposite (TFN) membranes were analyzed for their surface morphology, physicochemical properties, and separation performance. The introduction of MAF-6 nanoparticles significantly enhanced the permeability of the membranes while maintaining high selective rejection rates for dyes over salts. Specifically, membranes with 0.1 and 0.2 wt% MAF-6 loading exhibited superior permeability and separation efficiency. The enhanced performance was attributed to reduced cross-linking degree, improved hydrophilicity, and increased surface roughness of the PA layer. Long-term stability tests over 100 h demonstrated the robustness of the MAF-6 incorporated membranes. Additionally, the study elucidated the role of MAF-6 in the interfacial polymerization process, showing that it impedes monomer diffusion and influences the surface morphology of the PA layer. These findings highlight the potential of MAF-6 in tailoring membrane properties for advanced separation applications, particularly in the treatment of complex dye wastewater.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Dai Ziwen,Jin Pengrui,Yuan Shushan,Yang Jiakuan,Agrawal Kumar Varoon,Wang Huanting
Atomically thin graphene membranes with sub-1-nm pores show promise for ion/molecular separation, osmotic energy generation, and energy storage. Narrowing the pore size distribution and controlling the surface charge are essential to achieve these applications. However, nanoporous graphene membranes fabricated via conventional methods possess a broad pore size distribution and inadequately regulated surface charge, limiting their applications. Herein, we present a molecular anchoring approach for scalable synthesis of nanoporous graphene membranes via a bottom-up technique, aiming to narrow the pore size distribution without reducing the pore density while simultaneously adjusting the charge properties of nanopores. By selecting suitable anchoring molecules, the custom-tailored pore size distribution and chemical functionality of nanoporous graphene membranes can be achieved. Leveraging the steric restriction effect, anchoring monomers selectively traverse larger nanopores to form ion-selective plugs, effectively repairing these nanopores. The centimeter-scale nanoporous graphene membrane with an ion-selective plug achieves high separation selectivity (K + /Na + =20, K + /Mg 2+ =330). Theoretical simulations indicate that a smaller pore size, narrow pore size distribution, and positive charge result in a larger energy barrier difference, leading to ultrahigh metal ion selectivity. Furthermore, in treating lithium battery leaching solutions, Li + /divalent ions selectivity exceeds 900. These findings provide a way for designing graphene-based membranes.
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Membranes
·
2025
·Vol. 15
·期 4
·118
·
IF 3.6
Xu-Dong Cao,Yu-Xuan Shao,Qian Wang,Tian-Dan Lu,Jing Zhong
This study aims to optimize the application of electrospun nanofibrous substrates in thin-film composite (TFC) nanofiltration (NF) membranes for enhanced liquid separation efficiency by employing a method of effective welding between fibers using latent solvents. Polyacrylonitrile (PAN) nanofiber substrates were fabricated via electrospinning, and a dense polyamide selective layer was formed on their surface through interfacial polymerization (IP). The investigation focused on the effects of different solvent systems, particularly the role of dimethyl sulfoxide (DMSO) as a latent solvent, on the nanostructure and final membrane performance. The results indicate that increasing the DMSO content can enhance the greenness of the fabrication process, the substrate hydrophilicity, and the mechanical strength, while also influencing the thickness and morphology of the polyamide layer. At a DMSO rate of 30%, the composite membrane achieves optimal pure water permeability and high rejection rates; when the DMSO content exceeds 40%, structural inhomogeneity in the substrate membrane leads to an increase in defects, significantly deteriorating membrane performance. These findings provide theoretical insights and technical guidance for the application of electrospinning technology in designing efficient and stable NF membranes.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Riji Qiu,Junjian Zheng,Xingran Zhang,Fang Li
Combined scaling–biofouling is commonly encountered in practical wastewater treatment and desalination due to the coexistence of inorganic scalants and microorganisms, which is a major obstacle limiting the applications of membrane-based technologies. In this study, we developed a simple and effective modification method for the preparation of an anticombined scaling–biofouling thin-film composite (TFC) nanofiltration membrane via a synergetic strategy based on defensive (i.e., sequestering carboxyl groups) and offensive (i.e., immobilizing antimicrobial peptides (AMPs)) functions. According to the Extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) analysis, the sequestration of carboxyl groups by AMPs diminishes the acid–base polarity interaction between the biofoulants and membranes, playing a critical role in dismantling the bridge of carboxyl–Ca2+–carboxyl and subsequently rendering both scaling ions and carboxyl groups unavailable to fouling. Meanwhile, the immobilization of AMPs on the membranes prevents microbial metabolism and growth by contact-killing mechanisms, endowing the membrane resistance to severe biofouling in the presence of scaling ions. Furthermore, the synergetic effects overcome the permeability–rejection–antifouling trade-off by enhanced water permeance without sacrificing salt rejection. This research provides a novel dimension for developing high-performance TFC membranes for the mitigation of combined scaling–biofouling in the practical application of wastewater treatment and desalination.
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