JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yi-Fang Mi,Wen Xia,Bing-Xin Gu,Rong Ma,Yan-Li Ji
To simultaneously improve the water permeability, selectivity, and antifouling properties of polyamide nanofiltration (NF) membranes in textile wastewater treatment , we fabricated a salt-responsive thin-film nanocomposite (TFN) membrane with the incorporation of zwitterionic polymeric nanoparticles (ZNPs) into polyamide selective layer. Herein, the ZNPs were synthesized via an inverse miniemulsion polymerization with zwitterionic monomer , amino monomer, and cross-linker reagent. The salt-responsive property of ZNPs rendered their resultant membranes TFN-ZNPs with adjustable microstructure and separation performance via varying the sodium chloride (NaCl) concentration in water. The water permeance of TFN-ZNPs was enhanced to be 1.7 times that of its pure water permeance with the 10 g L −1 NaCl solution, and the salt-responsive behavior was reversible. Moreover, this salt-responsive property endowed the membrane with outstanding separation performance for the salt/dye or dye/dye mixtures. The selectivity of TFN-ZNPs to NaCl/congo red and methyl orange/neutral blue was enhanced to ∼104 and ∼127, respectively. The TFN-ZNPs with salt-responsive property also exhibited an improved antifouling performance, i.e., the flux recovery ratio was enhanced from 85.6 % to 96.5 % by washing with NaCl solution instead of deionized water . Thus, this work provided a paradigm shift in the fabrication of salt-responsive TFN membranes for the highly efficient separation of organic molecules and inorganic salts and wastewater treatment .
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高影响因子
POLYMER DEGRADATION AND STABILITY
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2025
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IF 7.4
Shiya Wang,Miaojun Xu,Wei Huang,Yingke Zhu,Juan Li,Peng Chen
Polyamide 56 (PA56) is a polyamide based on bio-based chemical and has attracted widespread attentions. In this paper, a series of phosphomolybdates (POMs) with Keggin structure were incorporated into PA56 to modify its flame-retardant properties. Different POMs show different effects on the flame-retardant efficiency in PA56. A small amount of 3 wt% sodium phosphomolybdate (PMoNa) or nickel phosphomolybdate (PMoNi) enable PA56 to achieve the UL-94 V-0 rating, while the samples containing other POMs are not classified in the test. The POMs promote the degradation of PA56 at low temperature and char formation at high temperature, and improves the thermal stability in air. Especially, the PMoNa and PMoNi restrain the release of heat, flammable volatiles and toxic gas by forming more char and changing the pyrolysis pathway during combustion, thus modify the flame retardancy of PA56 effectively. The mechanical properties are deteriorated more or less which need to be modified further.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
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IF 8.4
Wanzheng Ren,Jian Pan,Zhuoqun Li,Min Huang,Lilan Huang,Liqiang Gu,Hailin Cong
The substrate membrane plays a crucial role in determining the performance of composite nanofiltration membranes prepared by interfacial polymerization (IP). In this study, persistent hydrophilic modification of polyvinylidene fluoride-co-chlorotrifluoroethylene (PVDF-CTFE) was achieved by incorporating N-methylglucamine (N-MG) without altering the membrane's morphology or pore size. Moreover, thin-film nanofibrous composite (TFNC) nanofiltration membranes were prepared using the surfactant assembly regulated interfacial polymerization (SARIP) method with the modified PVDF-CTFE@N-MG nanofibrous membrane as the substrate. The effect of N-MG addition on the substrate membrane's hydrophilicity and the structure and performance of the polyamide (PA) separation layer was investigated. The results showed that the addition of N-MG significantly improved the hydrophilicity of the PVDF-CTFE nanofibrous membrane. The TFNC-5 membrane, prepared with the modified PVDF-CTFE@N-MG nanofibrous membrane as the substrate, exhibited permeability exceeding 13.5 L m −2 h −1 ·bar −1 for various dye solutions at 3 bar pressure, with rejection rates above 98 %. It also demonstrated excellent selective separation performance (separation factor for NaCl/Orange G reaching 97.38) and long-term operational stability. This work provides a method for the preparation of low-pressure, high-flux nanofiltration membranes, which is applicable to seawater desalination and dye wastewater treatment .
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高影响因子
DESALINATION
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2025
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IF 9.8
Shiqiang Liang,Wenbin Wang,Tongyao Wu,Jinkai Zhang,Qindong Wang,Shu Bi,Fan Yang,Chi Wang,Zhi Geng,Zhongmin Su
Nanofiltration (NF) membrane technology, distinguished for high separation performance and energy efficiency, has been extensively employed in desalination and wastewater treatment. Herein, high-precision 3D printing is used to fabricate robust support layers featuring ideal straight-through micropores, effectively minimizing permeation resistance. To ensure the generation of a high-quality PA selective layer, electrospinning deposits a thin nanofiber layer that divides the support layer surface into fine grids. Finally, interfacial polymerization (IP) forms a PA selective layer on the membrane substrate, which is integrated by 3D-printed support layer and nanofiber layer, yielding a highly permeable composite NF membrane. With reduced permeation resistance and enhanced mechanical strength, the novel 3D-printed composite NF membrane maintains a long-term water permeance of above 22.5 L m −2 h −1 bar −1 , about double that of commercial NF270 membranes. Meanwhile, it achieves exceptional Na 2 SO 4 rejection of 97.8 % and superior anti-fouling performance. This study offers a promising approach to fabricating high-performance NF membranes using high-precision 3D printing, providing an innovative and scalable strategy for developing next-generation functional membranes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
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IF 13.2
Zeya Li,Xin Wu,Mingyu Zhai,Shaojun Ma,Tifeng Jiao,Xiuli Wang,Laizhou Song
Despite significant advancements in nanofiltration (NF) technology, achieving a balance between high salt rejection and sufficient water permeability remains a critical challenge, thereby triggering tremendous efforts to develop performance-enhanced NF membranes. In this study, an improved interfacial polymerization method was used to introduce ethylenediamine tetramethylphosphoric acid (EDTMPA) into the aqueous phase and tetrabutyl orthotitanate (TBOT) into the organic phase. Consequently, the hydrophilic and negatively charged phosphonic acid groups were incorporated into the ultrathin separation layer of the fabricated NF membrane (NF-E-T) via the chemical bonding reaction between TBOT and EDTMPA, for the aim of enhancing salt rejection and water permeability. The physicochemical properties of the prepared membrane were analyzed using various characterization techniques, and molecular dynamic simulations were executed to validate the mechanisms underlying structural and performance changes of the membrane. The fabricated NF-E-T membrane exhibits a reduced separation layer thickness, enhanced hydrophilicity and slightly larger pore sizes, contributing to the improvement of membrane permeability; the increased negative charge in membrane surface and uniform pore distribution maintain the high salt rejection. Molecular dynamics simulations confirm that the incorporation of EDTMPA significantly enhances the diffusion rate of PIP and facilitates the formation of a thinner polyamide layer. The EDTMPA-TBOT complex promotes the diffusion of water molecules within the membrane matrix, thereby providing a favorable condition for the improvement of water permeability. Moreover, this membrane shows significant improvements in anti-fouling performance, oxidation stability, and long-term operation stability, achieving the favorable treatments for two types of industrial wastewater. This work will provide a firm guideline for developing high-performance nanofiltration membranes.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Yusen Chen,Shuzhao Zhang,Xiongcheng Duan,Jia Liu,Hengye Li,Meijie Wei,Wei Wang
The rapid and efficient removal of radioiodine from water is a challenging and meaningful task to safeguard human health. Herein, two calix[4]pyrrole-based polymers were prepared through Mannich reaction between nitrogen-rich 2,4,6-tri(piperazin-1-yl)-1,3,5-triazine (TPT) and two configurational isomers of tetra- meso resorcinol-functionalized calix[4]pyrrole (2α2β-CP and 4α-CP), referred as 2α2β-CP-TPT and 4α-CP-TPT, respectively. The nitrogen contents of 2α,2β-CP-TPT and 4α-CP-TPT were as high as 15.11 % and 14.84 %, respectively. Accompanied by the bowl-shaped calix[4]pyrroles, the CP-TPTs showed high vapor iodine uptake, especially 4.82 g/g for 4α-CP-TPT. More importantly, the CP-TPTs exhibited rapid adsorption kinetics for capture iodine from aqueous phase, with the 2α,2β-CP-TPT at 1 mg/mL level showing a k 2 value as high as 7.374 × 10 −3 g/(mg min). In addition, high iodine adsorption capacity for 2α,2β-CP-TPT and 4α-CP-TPT were achieved to be 1989.6 and 2812.6 mg/g from water, respectively. Even more impressive was the removal efficiency above 98 % in flow-through applications even at flow rate as high as 10 mL/min and in simulated seawater conditions. The CP-TPTs could also exhibit high dynamic iodine adsorption capacity from water as well as excellent stability and outstanding reusability. Adsorption mechanism study discovered the foundational role of the charge transfer interaction on the excellent adsorption performance of the CP-TPTs. All these features demonstrated promising application prospects of the CP-TPTs for iodine removal from water.
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高影响因子
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