JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Qing Yang,Ailin Gao,Lixin Xue
Polyvinylidene fluoride (PVDF) porous membranes with superwetting amphophilic surfaces were prepared by in situ cross-linking polymerization of varied triethoxyvinylsilane (VTES) and N-vinyl-2-pyrrolidone (VP) composition ratios during none-solvent induced phase separation (NIPS) processes, utilizing template stripping method. The extreme powers of surface roughness , in amplifying the finite differences in chemical composition of initial dope solution to the properties of the resulted membranes, were revealed by comparing the structures and surface properties of these membranes with super rough surfaces, to their analogues with medium-rough surfaces and films with smooth surfaces. “Butterfly Effect” was observed on the water/oil separation capability of the formed PVDF membranes from the finite variation on the initial chemical composition caused by the change of VTES/VP molar ratio in the dope solution from 0 to 0.33, 0.38, 0.43, 0.48 and 0.53. Huge variations in the oil and water fluxes and removal efficiencies in separating water-in-oil and oil-in-water emulsions of the formed membranes from the “Butterfly Effect” were studied relating to their differences in water-in-air contact angles, oil-in-air contact angles, oil-in-water contact angles and water-in-oil contact angles as well as pore sizes and surface roughness.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 17
·
IF 1.86
Chunhui Du,Xumin Ma,Jing Li,Chunjin Wu
This study describes the fabrication and properties of poly(vinylidene fluoride) (PVDF) filtration membranes modified by blending with ionic liquid block copolymer P(MMA- b -MEBIm-Br), which is synthesized via reversible addition-fragmentation chain transfer polymerization method. The attenuated total reflectance-Fourier transform infrared spectroscopy and X-ray photoelectron analyses reveal that the ionic liquid block copolymers are immobilized on PVDF membrane surface. The modified PVDF membrane exhibits excellent charged and antifouling properties because of the charged and hydrophilic properties of the copolymer. Scanning electron microscopy and atomic force microscopy also indicate the morphological characteristics of the membrane and demonstrate that the surface porous structure becomes denser after adding the copolymer. The data of filtration and the zeta potential of the membranes suggest that the charged properties of the ionic liquid block copolymers are mainly responsible for the improvement of the reversible fouling ratio and the decrease in the total fouling ratio of the membranes. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44751.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Junjie Yang,Wen Sun,Boyu Zhu,Hong Wang,Feng Yan,Jianxin Li,Zhenyu Cui
In this study, polyvinylidene fluoride (PVDF)/styryl maleic anhydride (SMA) hollow fiber membrane was fabricated using the Thermally Induced Phase Separation (TIPS) technique. Subsequently, zwitterion-sulfobetaine methacrylate (SBMA) was introduced to the membrane surface through a Michael addition reaction to create a nearly electrically neutral membrane surface. This modification effectively mitigated the high adsorption of differently charged protein pollutants on the membrane surface, thereby enhancing its anti-fouling performance. Simultaneously, the membrane surfaces with positive and negative charges were separately constructed, and the impact of membrane surface charge properties on the anti-fouling performance against positively and negatively charged foulants was investigated. Furthermore, detailed studies were conducted on the chemical structure, surface morphology, performance, and anti-fouling mechanism of the modified membranes. The results indicate that the electrically neutral membrane modified by zwitterionic SBMA exhibited excellent anti-fouling properties against both bovine serum albumin (BSA) and lysozyme (LYZ), with a flux recovery rate (FRR) reaching 96.5 % and 94.6 %, respectively. The static adsorption capacities of BSA and LYZ on the membrane surface decreased to 5.89 μg cm −2 and 9.53 μg cm −2 , respectively. Furthermore, the study investigated the structure of the hydration layer formed by zwitterionic SBMA on the membrane surface, as well as its hydration capacity and anti-fouling mechanism. Subsequently, through an assessment of the long-term stability of the modified membrane and its flux recovery rate (FRR), in conjunction with theories related to hydration layers and thermodynamics, it elucidated the anti-fouling mechanism involving “autonomy-response” synergistic enhancement of zwitterions. These findings will offer new strategies for researching hollow fiber membranes with superior anti-fouling properties and for applying zwitterions in membrane technology.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xiao Yu,Qing-Yun Wu,Lin Gu
Cellulose is a widely used hydrophilic material due to its rich hydrophilic hydroxyl groups. However, the presence of its lipophilic segment will affect the antifouling performance. Finding strategies to improve this problem has attracted considerable attention. In this work, a layer of silica was applied to a cellulose-deposited polyvinylidene fluoride membrane through a straightforward in-situ bionic silicification process of tetraethyl orthosilicate. The contact angle and oil droplet contact test proved that the high-hydrophilicity and underwater superoleophobicity of the silicified membranes were significantly enhanced. The surface structure and composition were analyzed by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The results of show that this improvement was mainly attributed to the presence of silicon hydroxyl groups, buried cellulose chains, and micro-nanostructures composed of cellulose and silica. The stable silica coating also provided protection for the polymeric membrane against degradation after water washing for 24 h, ultrasonic treatment (40 KHZ) for 10 min or exposure to different pH levels (pH=1, 4, 9 and 12) and saturated sodium chloride solution for 24 h. Furthermore, the silicified membrane showed outstanding oil adhesion resistance and permeation flux, enabling effective purification of different oil-in-water emulsions that were stabilized by emulsifiers. Notably, the membrane achieved a high oil removal rate (> 99.4 %) of various emulsions (toluene-in-water, cyclohexane-in-water, tetrachloroethane-in-water, soybean oil-in-water, toluene-in-salt solution, toluene-in-acid solution and toluene-in-alkaline solution emulsions). In particular, for toluene-in-water emulsions (oil droplets in the emulsion ranged from 58.77 nm to 615.1 nm), a significantly enhanced permeation flux (4777 L·m −2 ·h −1 ·bar −1 ) was obtained at 0.8 bar pressure. Even after multiple cycles of separation, the flux was higher than that of the unsilicified membrane. Overall, this approach is mild, simple, efficient, and easily scalable, making it an ideal method for producing superhydrophilic coatings with substantial application potential.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Libo Ba,Chen Chen,Rui Meng,Yuliang Chen,Yuliang Wu,Yijiang Liu,Weiwei Huang,Fei Yang,Jun Cheng,Xuesong Yi
High-efficiency polyamide nanofiltration membranes were recognized as crucial for alleviating freshwater scarcity. However, the rapid reaction rate between piperazine (PIP) and trimesoyl chloride (TMC) resulted in low membrane flux and suboptimal separation efficiency, which limited the application and development of membrane technology. Herein, a novel MOF-303@GO nanomaterials were prepared by in-situ growth method, which were anchored in the framework of the substrate membrane through a phase separation method to regulate the speed of interfacial polymerization reaction to improve the performance of composite nanofiltration membranes. The MOF-303@GO was found to exhibit an adsorption effect on PIP monomers for the accumulation of the PIP molecules around the MOF-303@GO in the membrane pore, which effectively slowed transfer rate of PIP. This process resulted in a thin PA layer and rough surface, which alleviated the resistance to water molecule transport during the membrane separation process. The adsorption mechanism between MOF-303@GO and PIP was profoundly demonstrated by density-functional theory calculations. Besides, the fabricated membrane demonstrated a good water permeability of 14.53 L·m −2 ·h −1 ·bar −1 , along as well as a high Na 2 SO 4 rejection of 96.56 %. This research provided a novel material to regulate the diffusion state of PIP molecules and introduced a key strategy for uniformly blending to modify the substrate membrane, offering a potential solution to the issue of excessively rapid IP reaction rates.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Pengtao Lei,Xiangyang Xu,Chenyu Huang,Dongsheng Chen,Zhenkun Jiang
To optimize the proton transport performance of polyvinylidene fluoride (PVdF), a proton exchange membrane (PEM) material, carbon nanotube (CNT), and zirconium hydrogen phosphate (ZrP) have been blended into the PVdF matrix. Adopting a hydrothermal synthesis route, the acidic ZrP can be better conjugated with the positively charged CNT functionalized by cetyltrimethylammonium bromide (CTAB). As visualized using electroscopes, ZrP nanocrystallines are intimately dotted and homogeneously distributed on CNT. The ZrP–PVdF interaction can be attributed to hydrogen bonding between hydroxyl and F-terminal groups. By incorporating well CNT/ZrP into PVdF via solution casting, the pore architecture can be regulated; namely, the macro-voids in PVdF are greatly reduced. The composite membranes exhibit tensile stress of 48–52 MPa while sustaining the thermal stability of PVdF. The incorporated CNT/ZrP can suppress void porosity and enhance film hydrophilicity. With improved wettability, the methanol permeability can be reduced to less than 2 × 10 −9 cm 2 ∙s −1 , ca. one-sixth that of pure PVdF. The proton conductivity for PVdF-CNT 0.03 -ZrP 0.06 , with CNT and ZrP mass content respectively 3 and 6 wt% that of PVdF, attains 0.089 S·cm −1 at 100°C, showing upgraded conducting capability. The membrane selectivity can be remarkably enhanced, verifying that CNT/ZrP blending is a facile and profitable approach for PEM optimization.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Xinying Zhang,Yuan Liu,Bingbing Zhang,Qiaoying Wang,Yongjing Wang,Yonghao Wang,Guozheng Shen,Zhencheng Hu
Membrane modification and the development of advanced materials represent promising strategies to mitigate membrane fouling and improve separation performance. In this study, a novel calcium borate nanoparticle (CaB NPs) with a tetrahedral structure was employed to modify polyvinylidene fluoride (PVDF) membranes through a synergistic surface engineering approach. The modified membranes were systematically evaluated in terms of permeability, fouling resistance, and antifouling mechanisms. At the optimal CaB NPs dosage of 15 mg (corresponding to a membrane area of 78.5 cm 2 ), the pure water flux increased by 3.59-fold, and the water contact angle was reduced from 74.9° (pristine) to 39.4°, while the zeta potential decreased from 38.4 mV to 29.8 mV. Additionally, the rejection of protein foulants improved by 20–30 % compared to that of the pristine membrane. The structural rearrangement of CaB NPs under alkaline conditions enhanced surface hydrophilicity and charge properties. Dual-mechanism fouling model analysis revealed that membrane fouling shifted from predominantly irreversible to reversible after modification, enabling effective foulant removal through physical cleaning. Furthermore, extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory indicated that the CaB-modified membrane exhibited a markedly higher energy barrier toward bovine serum albumin (BSA) adsorption. This study offers the mechanistic insights into protein fouling mitigation, and highlights its potential in sustainable wastewater treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 9
·1-12
·
IF 2.6
Asghar Muhammad Rehman,Yu Weibin,Zhang Weiqi,Su Huaneng,Liu Huiyuan,Xing Lei,Yan Xiaohui,Xu Qian
In this work, a poly (vinylidene fluoride) (PVDF) and cellulose acetate (CA) blend membrane is developed using the solution casting method for a direct methanol fuel cell (DMFC). The CA addition in PVDF polymer reduces the dense structure of the polymer and creates a porous surface by increasing the amorphous region that is confirmed by surface morphology and crystallinity examination tests. The high glass transition temperature of CA boosts the protection from the melting of PVDF membrane and increases the thermal shrinkage that reduces the probability of a short circuit. PVDF and CA with abundant hydroxyl groups and carboxylic groups enhance the water uptake, also the hydrogen bonding in between them promotes the mechanical strength and develops a tortuous structure that allows protons to pass through them and block the methanol crossover. The 60% PVDF and 40% CA blend membrane shows an ion exchange capacity value of 0.91 and a methanol permeability value of 4.21 × 10 –7 cm 2 s −1 , which is lower than that of the conventional Nafion 117 membrane (19.5 × 10 –7 cm 2 s −1 ). A direct methanol fuel cell with this membrane represents a power density value of 16.5 mW cm −2 with a voltage and current density values of 0.178 V and 165 mA cm −2 at 1 M methanol concentration and room temperature. Moreover, it shows a 70% voltage retention after 20 h of testing of the cell at room temperature that is superior to that of the commercial Nafion 117 membrane (48% voltage retention).
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120795
·
IF 7.2
Xiaolin Shi,Bo Xing,Guo Yang,Yi Wang,Pan Huang,Fuping Zhang,Qing Yang,Hangdao Qin,Ping Yang,Caiyi Jiang,Xingyong Liu
Polyvinylidene fluoride (PVDF) membrane filtration is extensively employed in the treatment of fluoride-containing wastewater due to low cost and operational simplicity. However, it still faces the challenges of unsatisfactory permeability and anti-pollution performance. In the present work, a novel PVDF ultrafiltration membrane modified with FeCo/BC (FeCo/BC@PVDF) that exhibits outstanding catalytic activity was fabricated via the non-solvent-induced phase separation (NIPS) method, which further enables the in-situ coupling between the as-fabricated membrane and peroxymonosulfate (PMS). The performance evaluation exhibits that the pure water flux and rejection rate of FeCo/BC@PVDF ultrafiltration membrane increased from 235.91 L⋅m −2 ⋅h −1 and 51.63 % to 445.61 L⋅m −2 ⋅h −1 and 90.71 %, and the irreversible pollution rate has decreased from 37.69 % to 17.67 % in in-situ coupling PMS systems. Meanwhile, the characterization results of XRD, FTIR, SEM, XPS and water contact angle (WCA) confirmed that the outstanding permeability and anti-pollution performance were attributed to good pore distribution, hydrophilicity and catalytic performance. In addition, the pollution model fitting, extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory and heterogeneous experiments were used to further understand the anti-pollution mechanism of FeCo/BC@PVDF, and the results reveal that pollution mode of ultrafiltration membrane has changed from multiple contamination behaviors to easily rinsed cake layer contamination because of the in-situ degradation effect of SO₄⁻•, O₂⁻• and •OH on sodium p-perfluorous nonenoxybenzenesulfonate (OBS). This research provides a new idea for simultaneously improving the permeability and anti-pollution performance of PVDF ultrafiltration membranes in the field of fluorine-containing wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Hao Zhang,Man Xu,Muning Chen,Yanhua Cui,Li Chen,Xiaohui Dai,Jiangdong Dai
The effective separation of oil-water emulsion and the degradation of organic dyes are significant for solving the problem of environmental pollution . In this view, porphrin-cored with siloxane-poly(amido amine) dendrimer(PP-Si-PAMAM) blending PVDF composite membrane (PP-Si-PAMAM/PVDF) was successfully prepared by using simple non-solvent-induced phase inversion method. After introducing PP-Si-PAMAM into PVDF membrane matrix, the porosity, hydrophilicity and mechanical properties of the composite membrane were significantly improved. The resultant membrane exhibits admirable separation performance (above 99.1%) and high permeation flux (830–1471 L∙m −2 ∙h −1 ∙bar −1 ) for a series of oil-water emulsions. After 10 cycles of separation, the separation efficiency of the PP-Si-PAMAM/PVDF membrane is still more than 99%, and it still maintains excellent separation efficiency and permeability after extreme chemical environment treatment. Moreover, PP-Si-PAMAM/PVDF membrane has excellent degradation effect on organic dyes RhB and MB under visible light, and the degradation efficiency reaches 88% and 90% respectively in a short time. This work has huge potential applications in wastewater treatment with its combined advantages of oil-water emulsion separation and catalytic degradation of organic dye contaminants.
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Ming Cai,Ding Yuan,Xiao Zhang,Yi Pu,Xiaofang Liu,Hongwei He,Lixue Zhang,Xin Ning
Here, a novel PVDF-HFP/PI side-by-side bicomponent electrospun separator with cross-linked structure is successfully fabricated for lithium-ion batteries (LIBs). The bicomponent composite fiber not only integrates the excellent characteristics of PVDF-HFP and PI , but also improves the mechanical strength of the electrospun nonwoven and maintains a high level of porosity, up to 85.9 %. Moreover, the PVDF-HFP/PI(T) fibrous separator emerges outstanding performance, including the thermal dimensional stability (up to 200 °C), self-extinguishment, high electrolyte uptake (483.5 %), good ionic conductivity (1.78 × 10 −3 S/cm), wide electrochemical stability window (up to 4.94 V vs. Li + /Li) and favorable interface structure . It is further confirmed by the 3D simulation that the PVDF-HFP/PI(T) nonwoven using as the LIBs separator is beneficial to the homogeneous transmission of lithium ions . As a result, the coin cells with PVDF-HFP/PI(T) separator possess the best first discharge capacity (120.41 mAh g −1 ) and coulombic efficiency (99.36 %) with respect to that of Celgard2320 separator and cross-electrospun PVDF-HFP + PI(T) separator. After 50 cycles, the discharge capacity of Li/PVDF-HFP/PI(T)/LiFePO 4 is found to be retained around 98.13 %, which is higher than 94.91 % of Celgard2320 separator and 96.09 % of cross-electrospun PVDF-HFP + PI(T) separator. Moreover, the coin cell using the PVDF-HFP/PI (T) separator exhibited good discharge capacity under different discharge C-rate at 45 °C, indicating its potential for the high-temperature safety of LIBs. In sum, the PVDF-HFP/PI(T) nonwoven with excellent property has an application prospect in the field of LIBs separator, which also provides a reliable strategy for designing the electrospun separator with improved performance.
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2023
·Vol. 17
·期 3
·1-13
·
IF 2.7
Bo Ruitian,Wang Chunfeng,Wang Yongliang,He Peigang,Han Zhidong
The layer-structured composites were built by the dielectric and insulating layers composed of polyvinylidene fluoride (PVDF) and low-density polyethylene (LDPE) composites containing barium titanate (BT) to modulate the dielectric and energy storage properties of the composites. The simulations on the interface models for molecular dynamics and the geometric models for finite element analysis were performed together with the experimental characterization of the morphology, dielectric, and energy storage properties of the composites. The results revealed that polyethylene as an insulating layer played a successful role in modulating dielectric permittivity and breakdown strength while BT particles exerted positive effects in improving the miscibility between the composed layers and redistributing the electric field. The strong interface binding energy and the similar dielectric permittivity between the PVDF layer and the BT20/LDPE layer made for the layer-structured composites with a characteristic breakdown strength ( E b ) of 188.9 kV·mm −1 , a discharge energy density ( U d ) of 1.42 J·cm −3 , and a dielectric loss factor (tan δ ) of 0.017, which were increased by 94%, 141%, and decreased by 54% in comparison with those of the BT20/PVDF composite, respectively.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）