Polymers
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2022
·Vol. 14
·期 3
·621
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IF 4.967
Han Wu,Jia Shi,Xin Ning,Yun-Ze Long,Jie Zheng
A simple and novel strategy of superhydrophilic-superhydrophobic Janus membrane was provided here to deal with the increasingly serious oil-water separation problem, which has a very bad impact on environmental pollution and resource recycling. The Janus membrane of cPVA-PVDF/PMMA/GO with opposite hydrophilic and hydrophobic properties was prepared by layer-by-layer electrospinning. The structure of the Janus membrane is as follows: firstly, the mixed solution of polyvinylidene fluoride (PVDF), polymethylmethacrylate (PMMA) and graphene oxide (GO) was electrospun to form a hydrophobic layer, then polyvinyl alcohol (PVA) nanofiber was coated onto the hydrophobic membrane by layer-by-layer electrospinning to form a composite membrane, and finally, the composite membrane was crosslinked to obtain a Janus membrane. The addition of GO can significantly improve the hydrophobicity, mechanical strength and stability of the Janus membrane. In addition, the prepared Janus membrane still maintained good oil-water separation performance and its separation efficiency almost did not decrease after many oil-water separation experiments. The flux in the process of oil-water separation can reach 1909.9 L m−2h−1, and the separation efficiency can reach 99.9%. This not only proves the separation effect of the nanocomposite membrane, but also shows its high stability and recyclability. The asymmetric Janus membrane shows good oil-water selectivity, which gives Janus membrane broad application prospects in many fields.Keywords:oil-water separation;Janus membrane;electrospun nanofiber;superhydrophobic
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Lijian Shi,Yaping Zhang,Yujia Tong,Wenlong Ding,Weixing Li
Membrane pollution caused by separating oily wastewater is a big challenge for membrane separation technology. Recently, plant-/mussel-inspired interface chemistry has received more and more attention. Herein, a high antifouling poly (vinylidene fluoride) (PVDF) membrane, coated with tea polyphenols (TP, extracted from green tea) and 3-amino-propyl-triethoxysilane (APTES), was developed to purify oil-in-water emulsions. ATR-FTIR, XPS and SEM were used to demonstrate the evolution of surface biomimetic hybrid coatings. The performances of the developed membranes were investigated by pure water permeability and oil rejection for various surfactant-stabilized oil-in-water emulsions. The experimental results revealed that the membrane deposited with a mass ratio of 0.1/0.2 exhibited ultrahigh pure water permeability (14570 L·m −2 ·h −1 ·bar −1 , 1 bar=0.1 MPa) and isooctane-in-water emulsion permeability (5391 L·m −2 ·h −1 ·bar −1 ) with high separation efficiency (>98.9%). Even treated in harsh environment (acidic, alkaline and saline) for seven days, the membrane still maintained considerable underwater oleophobic property (148°–153°). The fabricated plant-inspired biomimetic hybrid membranes with excellent performances light a broad application prospect in the field of oily wastewater treatment.
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DESALINATION
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2021
·
IF 9.501
Chuanfeng Wang,Yingbo Chen,Xiaoyu Hu,Xianshe Feng
A polyamide/poly(vinylidene fluoride) composite hollow fiber membrane (HFM) was designed by in situ interfacial polymerization (IP) during the fiber spinning process. Using a piperazine aqueous solution as the bore fluid and a dual-bath coagulation, the PA outer layer was formed via IP of the PIP in the bore fluid and TMC in the second reactive bath during phase inversion process. Chemical structure, membrane morphology and surface property were characterized by using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), and zeta potential . The effects of several parameters involved in the membrane fabrication (e.g., piperazine concentration, bore fluid flow rate , residence time and heat treatment temperature) on the morphology and performance of resultant composite HFMs were investigated. The composite HFM showed a performance that is comparable favorably with conventional nanofiltration membranes in terms of showed water permeability (10.2 L/m 2 ·h·bar), high rejection to dyes (i.e., 100% for CR and EBT, 99.99% for RhB and MB , 98.3% for MO) and low salt rejections (NaCl 6.2%). Moreover, the newly developed composite HFM showed good stability and flux recovery with simple water rinsing for treatment of simulated textile wastewater . This work is expected to provide a new approach to designing composite HFMs for the treatment and reuse of textile wastewater.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2020
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IF 7.094
Jianping Chen,Jingling Liu,Lixin Cai,Chunyan Wang,Liangliang Liu,Quanling Yang,Chuanxi Xiong
Due to the growing energy demands, it is highly desirable to concurrently improve the thermal conductivity and dielectric breakdown strength of dielectric film capacitors. Polyvinylidene fluoride (PVDF) is hitherto regarded as a most satisfactory alternative for dielectric capacitors but with relatively low thermal conductivity and dielectric breakdown strength. Herein, a major contribution is made to the concurrent enhancement of PVDF-based thermal conductivity and dielectric properties . It can be readily achieved through the incorporation of as-prepared high-quality few-layered boron nitride nanosheets (BNNSs) with a minimized loading (defined as PVDF-BNNSs). BNNSs dispersion with intact structure and a large aspect ratio is prepared by a unique mild mechanical stirring process assisted by dimethyformamide/1-butanol (DMF/1-butanol) solvent and a low power ultrasonic. Encouragingly, the characteristic breakdown strength with a maximum value of 334 MV/m reaches for PVDF-BNNSs composite only with 3 vol% BNNS loading, to be 1.6 times of pure PVDF. It also presents a high discharged energy density up to 9.9 J cm -3 , along with an efficiency of 68.3%. Synchronously, the thermal conductivity accomplishes a high value of 1.12 W/m·K with only 8 vol% BNNS loading. A further theoretical analysis reveals that high-quality appropriate BNNSs loading could be preferentially arranged in parallel with PVDF surface. It indicates that BNNSs have good interface compatibility with PVDF, thus to improve its associated performances concurrently.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2023
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IF 6.8
Qian Ye,Hanbin Wu,Jin Li,Yinyin Huang,Mingliang Zhang,Qianqian Yi,Bin Yan
Anthraquinone is a redox mediator that can effectively catalyze the degradation of azo dyes by promoting the electron transfer. In this study, a mediator membrane with poly (vinylidene fluoride) (PVDF) as the membrane support and 1,8-dichloroanthraquinone (1,8-AQ) and graphene oxide (GO) as the additives was prepared and characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), atomic force microscopy (AFM) and water contact angle. The introduction of GO increases the pure water flux of the membrane to 258.56 ±12.93 L/(m 2 ·h). Its catalytic performances for the biodegradation of azo dyes were evaluated. Under the optimized conditions, the 1,8-AQ/GO/PVDF composite membrane is able to improve the dye degradation efficiency 2.2 times for reactive red X-3B and 1.1 times for acid red B, as compared with PVDF membrane. In addition, the mediator membrane maintains stable and high catalytic efficiency in the cyclic test and over 90 % dye degradation efficiency is still obtained after 5 cycles of decolorization. These results suggest the great application potentials of the 1,8-AQ/GO/PVDF membrane in the dye wastewater treatment.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jingxuan Zhao,Hongxu Liu,Yuanhang Zhao,Yuchao Qi,Ruijia Wang,Ziwei Lv,Yang Yu,Shulin Sun,Yiming Wang,Aihua Xie
Currently, the most effective way to improve the anti-fouling performance of water treatment separation membrane is to enhance the hydrophilicity of the membrane surface, but it can still cause contamination, leading to the occurrence of flux reduction. The construction of a strong hydration layer to resist wastewater contamination is still a challenging task. In this study, a defect-free hydration layer barrier was achieved by grafting chitosan polysaccharide derivatives (CS-SDAEM) on the membrane, which achieved in effective fouling prevention and low flux decline rate. A layer of tannic acid-coated carbon nanotubes (TA@CNTs) has been uniformly deposited on the commercial PVDF membrane so that the surface was rich in -COOH groups, providing sufficient reaction sites. These reactive groups facilitate the grafting of amphiphilic polymers onto the membrane. This modification strategy achieved in enhancing the antifouling performance. The modified membrane achieved low contamination rate with DR of 16.9 % for wastewater filtration, and the flux recovery rate was above 95 % with PWF of 1100 (L·m −2 ·h −1 ). The membrane had excellent anti-fouling performance, which provided a new route for the future development of water treatment membrane.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Lunbo Xu,Yu Liu,Wei Wang,Shusu Shen,Ganwei Zhang,Renbi Bai
Metal-organic frameworks (MOFs) possess various beneficial potentials, including the ability to enhance the porosity and water flux of membranes, and assist in the catalysis of the photodegradation of organic compounds such as dyes, through the interactions of the metal ions within MOFs. In this study, a MOF-808/polyvinylidene fluoride (PVDF) mixed matrix membrane (MMM) was constructed using the non-solvent induced phase separation (NIPS) method, in which, an ionic liquid, 1-butyl-3-methylimidazolium chloride was introduced as the co-solvent in the casting solution solvent, to increase the dispersibility and blending ratio of MOF-808 particles in the mixture. The optimal membrane with 1.5 wt% MOF-808 exhibited ultra-high water permeability (58.08 L·m⁻²·h⁻¹·bar⁻¹) and excellent rejection for various dyes (>90 %). The ESR spectroscopy test has proved the existence of •O 2 - and •OH in MOF-808/PVDF membrane under light irradiation, and the membrane exhibited outstanding photocatalytic self-cleaning ability, achieving a Congo Red (CR) degradation efficiency of 96.57 % under light exposure. Moreover, even after five photocatalytic self-cleaning cycles, the membrane flux almost recovered to its initial state, and the membrane maintained good CR rejection (>90 %). These observations provide ideas for developing high flux membrane technologies with photocatalytic capabilities, which will be applied for efficient treatment of practical dye wastewater.
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JOURNAL OF POWER SOURCES
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2024
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IF 8.1
Wangbing Yao,Zhuoyuan Zheng,Xudong Zhang,Jie Zhou,Jinbao Song,Dongming Liu,Yusong Zhu
In the quest for high-energy-density lithium metal batteries (LMBs), the stabilization of lithium (Li) metal anodes during fast charging remains a formidable challenge. In this study, a novel copolymer , Poly(methyl methacrylate- co -styrene) (namely PMS) is synthesized and blended with Poly(vinylidene fluoride) to fabricate a porous gel polymer electrolyte (GPE, namely PMS-PVDF) through the nonsolvent-induced phase separation technique, which significantly enhances the electrochemical stability and fast-charging capabilities of LMBs. The developed GPE exhibits a high ionic conductivity of 5.62 mS cm −1 , thereby reducing the formation of detrimental Li dendrites and leading to over 400 h stripping/plating process at 0.5 mA cm −2 . Extensive electrochemical tests show that the LMBs with the obtained PMS-PVDF GPE achieve exceptional cycle stability over 600 and 1000 cycles at the C-rates of 0.5 and 3 C, respectively, outperforming traditional electrolytes. Furthermore, the ultra-stability of the quasi-solid-state electrolyte is demonstrated in a 375 mAh pouch cell setup, suggesting an essential trait for the practical application of high-power devices. This work marks a pivotal contribution to the field of energy storage, delivering insights and a clear methodology that pave the way for the development of next-generation LMBs poised for commercial viability.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2024
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IF 5.9
Ziqiang Yang,Yingdong Yang,Bin Yang,Mengning Luo,Yue Zhang,Jibin Miao,Shijun Kang,Zhengzhi Zheng,Jiasheng Qian,Ru Xia,Yuchao Ke,Yang Pan
In this work, a non-solvent induced phase separation (NIPS) technique was used to prepare polyvinylidene difluoride (PVDF) lithium battery (LIB) separators. Firstly, vermiculite nanosheets (VNs) coated by polydopamine (PDA), i.e., VNs@PDA, was ultrasonically dispersed in DMAc and PVDF was solution-blended with VNs@PDA with final porous composite films obtained after the extraction of DMAc. Effects of the presence of VNs@PDA on both structure and properties of PVDF films were intensively studied, and the SEM observations further suggested that the addition of VNs@PDA heavily affected the thermodynamic parameters between the polymer and solvent, causing a remarkable enhancement on the thermodynamic instability of the PVDF solution system. The polymer–solvent phase separation by the addition of less nonsolvent tended to induce the formation of long finger-like pores. An incorporation of 7.0 wt% VNs@PDA resulted in an increase in ionic conductivity of the composite membrane from 0.320 mS·cm −1 to 1.515 mS·cm −1 via AC impedance tests. The incorporation of VNs@PDA not only enhanced the hydrophilicity of the composite films (as judged by water contact angle dropping from 112.7° to 74.2°), but also significantly improved both battery performance and mechanical properties. The present study provides a facile way of fabricating LIB separators with sufficiently high safety and superior performance.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Xi Wu,Xiaohua Jie,Xinghua Liang,Qicheng Hu,Liuyan Zhang,Jin Wang,Shufang Wu
Solid state lithium-ion batteries (SSLIBs) with high safety and high energy density are promising novel energy storage devices. However, the performance of SSLIBs would descend under a wide work temperature range. A flexible ceramic-polymer composite solid electrolyte membrane was created by solution casting to obtain good stability of SSLIBs at different temperatures. The PVDF-HFP-PES-LiClO 4 -Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) composite solid electrolyte shows excellent electrochemical performances in the temperature range of 20 to 60 o C. The ionic conductivity of PVDF-HFP-PES-LiClO 4 -LLZTO (PPLL) is 4.26 × 10 -4 , 4.97 × 10 -4 , 5.26 × 10 -4 , 5.59 × 10 -4 and 5.97 × 10 -4 S cm -1 at 20, 30, 40, 50 and 60 o C, respectively. The PPLL was employed in LiFePO 4 (LFP)/PPLL/Li batteries, and their properties were tested at 0.2 C. The test results show that the LFP/PPLL/Li battery has a good charge-discharge, rate, and cyclic performance at 20 - 60 o C. After 150 cycles with 0.2C at 30 o C and 60 o C, the capacity retention rates of 75.6% and 86.4%, respectively. This work provides an effective strategy for designing and preparing SSLIBs.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Yifan Liu,Siyang Zhao,Chenggong Xu,Jinxia Huang,Zhiguang Guo
The complex wastewater contaminated with oil and organic dyes tremendously threatens ecological environment and human habitat. The single functional membrane separation technology is not qualified to deal with complex wastewater treatment. Therefore, it is necessary to develop multifunctional membrane materials possess the ability to both oil/water separation and organic dye adsorption. Hence, we develop a simple and environmental strategy to incorporate zeolitic imidazolate framework-8 (ZIF-8) as the nanomaterial adsorbents into superhydrophilic hydrogel coated PVDF membrane through in-situ growth and gained the anti-oil fouling and dye adsorption properties. The prepared tannic acid-poly(acrylamide- co -acrylic acid)-sodium alginate@ZIF-8 (TPS@ZIF-8) hydrogel coated PVDF membrane exhibited high oil-in-water emulsion separation efficiency of 99.77% after 10 cycles of separation and outstanding anti-oil fouling property that flux recover rate more than 96.86% in the continuous filtration experiment, owing to the strong hydration ability of TPS@ZIF-8 hydrogel coating. Moreover, the abundant adsorption active sites (including imidazole ring, –COO – , phenolic hydroxyl and benzene ring) consisted by ZIF-8 adsorbent and hydrophilic functional groups on the TPS@ZIF-8-PVDF improved the dye adsorption capacity and exhibited selective cationic dye adsorption with efficiency over 98.7% after multiple cycles of dye filtration adsorption test. The adsorption process of TPS@ZIF-8-PVDF membrane for methylene blue (MB) followed the pseudo-second-order kinetic model and Langmuir adsorption model. Incorporating the dye adsorption performance of ZIF-8 nanomaterials with underwater superoleophobic property of TPS hydrogel coated separation membrane, the prepared ZIF-8 composited hydrogel coated PVDF membrane could simultaneously separate the MB dyed oil-in-water emulsion mixtures and showed cycle performance stability (separation over 99.7%). Furthermore, TPS@ZIF-8-PVDF membrane could maintain the superwetting and dye adsorption properties in various chemical/mechanical environments and even friction test. This study offers new insights into the design of multifunctional superwetting hydrogel coated membrane for complex wastewater treatment and purification.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanbing Zhu,Hao Xiu,Gang Xue,Tianyong Lei,Yu Wang,Zhongfang Li,Shuren Cong,Tingting Wei
The piezoelectric properties are closely related to the properties of photocatalytic membrane in water environment. Here, a self-polarized g-C 3 N 4 /MoO 3 /PVDF-TrFE membrane with high piezoelectricity was synthesized using a facile spin-coating strategy. In the presence of a low-speed water flow, a stabilized photocatalytic hydrogen evolution rate (538.8 µmol g -1 h −1 ) was obtained for the g-C 3 N 4 /MoO 3 /PVDF-TrFE membrane. Experimental results revealed that the g-C 3 N 4 /MoO 3 induced a reorganization of PVDF-TrFE structure and thereby enlarged the polarization electric field to promote the directional migration of charge carriers and exciton dissociation. Additionally, pressure current test demonstrated that under the same pressure conditions, g-C 3 N 4 /MoO 3 /PVDF-TrFE exhibited a higher response than PVDF-TrFE. This work establishes a new method for the polarization electric field and provides a deeper understanding of the hydrogen evolution mechanism.
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