Membranes
·
2025
·Vol. 15
·期 9
·264
·
IF 3.6
Shuhang Lu,Qianhui Xu,Mei-Ling Liu,Dong Zou,Guangze Nie
The efficient purification of Pb(II)-containing wastewater is essential for safeguarding public health and maintaining the aquatic environment. In this study, novel hydrous ferric oxide (HFO) nanoparticle-embedded poly(vinylidene fluoride) (PVDF) composite adsorption membranes were developed through a simple blending method for efficient Pb(II) removal. This composite membrane (denoted as HFO-PVDF) combines the excellent selectivity of HFO nanoparticles for Pb(II) with the membrane’s advantage of easy scalability. The optimized HFO-PVDF(1.5)membrane achieved adsorption equilibrium within 20 h and exhibited excellent adsorption capacity. Moreover, adsorption capacity markedly enhanced with increasing temperature, confirming the endothermic nature of the process. The developed HFO-PVDF membranes demonstrate significant potential for real-world wastewater treatment applications, exhibiting exceptional selectivity for Pb(II) in complex ionic matrices and could be effectively regenerated via a relatively straightforward process. Furthermore, filtration and dynamic regeneration tests demonstrated that at an initial Pb(II) concentration of 5 mg/L, the membrane operated continuously for 10–13 h before regeneration, treating up to 200 L/m2of wastewater before breakthrough, highlighting potential for cost-effective industrial wastewater treatment. This study not only demonstrates the high efficiency of the HFO-PVDF membrane for heavy metal ion removal but also provides a theoretical foundation and technical support for its practical application in water treatment.
研究领域:
环境科学
·
水处理
·
材料科学
·
化学工程
·
吸附技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 7
·4268-4277
·
IF 2.779
You Yan-bin,Wang Hai-yan,Li Lan,Bai Lin-rui,Dang Zhi-Min
In order to improve the dielectric properties and the thermal conductivity of the PVDF-based composites, the BaTiO 3 @super-short MWCNT (BT@SSCNT) particles were modulated by a SSCNT shell fabricated by MWCNT with the different types (S-MWCNT-1020, S-MWCNT-2040). The average size of these particles is about 300 nm. With the increase in the external diameter of MWCNT, the SSCNT content of the BT@SSCNT particles decreases. However, the sum proportions of which the diameter of the particles is not less than 295 nm have a distinct growth leading to that the distance between the neighboring particles shortens. The dielectric constants of the composites are more than 355 and 1500 (10 3 Hz) at 10 wt% and 60 wt% filler loading, respectively. Compared with the BT@SSCNT/PVDF-1020 composites, the dielectric constants of the BT@SSCNT/PVDF-2040 composites have a more stable frequency dependency in the range of 10 2 to 10 6 Hz. The value of the composite with 10 wt% BT@SSCNT loading maintains more than 250 at 10 6 Hz. The introduction of the shell of SSCNT with larger external diameter can offer the composites a more desirable combined action of dielectric mechanisms, including interfacial polarization and micro-capacitor effect. In addition, the varying SSCNT shells also have evident influence on dielectric loss, breakdown strength, and thermal conductivity. It is worth mentioning that the values of the BT@SSCNT/PVDF-2040 composites are 334 and 0.16 (10 4 Hz), 229 kV mm −1 , and 1.13 W (m K) −1 at 10 wt% filler loading, respectively. This work could extend the strategies for building the core–shell particles to develop dielectric nanocomposites.
研究领域:
材料科学
·
电气工程
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DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 9
·1680
·
IF 4.967
Qiuping He,Wei Chen,Pengfei Wang,Xiaoming Dou
Separation of dichlorobenzene (DCB) isomers with high purity by time− and energy−saving methods from their mixtures is still a great challenge in the fine chemical industry. Herein, silicalite-1 zeolites/polydimethylsiloxane (PDMS) hybrid membranes (silicalite-1/PDMS) have been successfully fabricated on the porous polyvinylidene fluoride (PVDF) supports to first investigate the pervaporation separation properties of DCB isomers. The morphology and structure of the silicalite-1 zeolites and the silicalite-1/PDMS/PVDF hybrid membranes were characterized by XRD, FTIR, SEM and BET. The results showed that the active silicalite-1/PDMS layers were dense and continuous without any longitudinal cracks and other defects with the silicalite-1 zeolites content no more than 10%. When the silicalite-1 zeolites content exceeded 10%, the surfaces of the active silicalite-1/PDMS layers became rougher, and silicalite-1 zeolites aggregated to form pile pores. The pervaporation experiments both in single-isomer and binary−isomer systems for the separation of DCB isomers was further carried out at 60 °C. The results showed that the silicalite-1/PDMS/PVDF hybrid membranes with 10% silicalite-1 zeolites content had better DCB selective separation performance than the silicalite-1/α−Al2O3membranes prepared by template method. The permeate fluxes of the DCB isomers increased in the order of m−DCB < o−DCB < p−DCB both in single-isomer and binary-isomers solutions for the silicalite-1/PDMS/PVDF hybrid membranes. The separation factor of the silicalite-1/PDMS/PVDF hybrid membranes for p/o−DCB was 2.9 and for p/m−DCB was 4.6 in binary system. The permeate fluxes of the silicalite-1/PDMS/PVDF hybrid membranes for p−DCB in p/o−DCB and p/m−DCB binary−isomers solutions were 126.2 g∙m−2∙h−1and 104.3 g∙m−2∙h−1, respectively. The thickness−normalized pervaporation separation index in p/o−DCB binary−isomers solutions was 4.20 μm∙kg∙m−2∙h−1and in p/m−DCB binary−isomers solutions was 6.57 μm∙kg∙m−2∙h−1. The results demonstrated that the silicalite-1/PDMS/PVDF hybrid membranes had great potential for pervaporation separation of DCB from their mixtures.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xingang Liu,Xi Li,Xingneng Wei,Junyu Chen,Yijun Li,Chuhong Zhang
Porous poly(vinylidene fluoride) (PVDF) attracts considerable attention for mechanical energy harvesting and self-powered systems owing to its exceptional electromechanical coupling capabilities. Supercritical carbon dioxide foaming (SCF) that features solvent-free and green nature is one of the most preferable approaches to construct controllably porous polymers. Nonetheless, the electroactive β-phase of PVDF remains elusive during SCF due to its instability under an elevated temperature. Herein, we pioneer the use of ionic liquid (IL)-assisted SCF for the fabrication of self-polarized β-PVDF piezoelectric foam with tailored cells. IL incorporation not only facilitates CO2 infusion but also catalyzes the formation and preservation of β-phase crystals throughout the SCF process, culminating in a PVDF foam with an exceptionally high β-phase content (98%). Furthermore, the constructed honeycomb-like pore can effectively absorb external forces and significantly amplify the compressive strain, substantially enhancing the piezoelectric output of the PVDF foam. Impressively, PVDF foam with circumferential pore delivers a maximum piezoelectric output of 19.1 V, setting a new benchmark for SCF fabricated PVDF-based foam PEH. This advanced piezoelectric PVDF foam demonstrates significant potential as a flexible sensor for real-time monitoring of human foot pressure, highlighting its utility in adaptive sensing applications.
研究领域:
材料科学
·
高分子科学
·
能量转换与存储
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纳米技术
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机械工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Lu Ye,Jun Wei,Bixuan Zhu,Chuanyezi Cai,Ruiqi He,Gengqi Tong,Jiacheng Guo,Xi Chen,Yu He,Xinrui Yan,Erhao Cheng,Jianjun Zhang,Sude Ma
PVDF is one of the most researched polymers for the development of high energy density film capacitors, and its crystalline structure and dipole motion are closely related to the energy density. In this work, the low-loss amorphous polymer PMMA was introduced as a reinforcing phase to blend with PVDF to form a matrix. PMMA/PVDF-BT nanocomposites were prepared by spin-coating method and subjected to quenching heat treatment in three media, namely, deionized water, ice water, and liquid nitrogen, respectively. The results showed that the quenching heat treatment achieved a synergistic increase in permittivity and breakdown strength without sacrificing the mechanical properties of the nanocomposites, while maintaining a low dielectric loss. The discharge energy density of the quenched heat-treated PMMA/PVDF-BT nanocomposite in ice water at 180 °C was 11.5 J/cm 3 (3100 kV/cm), which was about 958.33 % of the best commercial BOPP film (1.2 J/cm 3 ). This work has great potential as flexible dielectric substrates for advanced and sophisticated film capacitors.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
介电与电磁学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Peiqing Zhang,Sihang Li,Fan Xiao,Yongfang Xiao,Yi Zhang,Zhongguo Shan,Zhenyu Li,Haihua Wang
Membrane distillation (MD) represents a promising advance in wastewater purification, contributing to the mitigation of water scarcity. Hydrophobic poly(vinylidene fluoride) (PVDF) microporous membrane is susceptible to wetting by low surface tension substances, leading to fouling. To address this, PVDF membrane was superhydrophobically modified using modified ZIF-8 to obtain two composite membranes, AZ/PVDF and Z@C/PVDF. AZ/PVDF and Z@C/PVDF composite membranes were prepared by coating more dispersible APTES-ZIF-8 and ZIF-8@MWCNT, respectively, onto the surface of PVDF membrane. The hydrophobicity of the composite membranes was regulated by silane types, fluorination methods, and fluorination time, resulting in reduced surface roughness and increased surface energy. The contact angles of AZ/PVDF and Z@C/PVDF were 154.2 ± 3.4° and 156.8 ± 4.2°, respectively. Both AZ/PVDF and Z@C/PVDF membranes demonstrated outstanding mechanical, thermal, and chemical stability. AZ/PVDF and Z@C/PVDF membranes outperformed PVDF membrane, extending operation times by 2 h and 3 h, respectively, without obvious NaCl crystals. Furthermore, Z@C/PVDF membrane exhibited superior resistance to wetting by SDS than AZ/PVDF and PVDF membranes, treating pickle brine via the direct contact MD (DCMD) process with a recovery rate of 30.2 % within 10 h. Overall, this research offers a promising approach to fabricating superhydrophobic composite membranes for high-salt brine treatment via DCMD.
研究领域:
化学工程
·
材料科学
·
环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zhong Tian,He Guoxu,Wan Menghui,Xu Chenglong,Wang Zhiqiang,Wang Zhihua,Zhao Yanbao,Sun Lei
Inspired by the multi-scale wrinkled patterns observed on tree bark surfaces, a novel approach was developed to enhance oil–water selectivity in emulsion separation by constructing nanoscale rough structures on membrane surfaces, endowing them with superhydrophobic and superoleophilic properties. Specifically, PVDF electrospun nanofibrous membranes were coated with a composite layer composed of polydimethylsiloxane (PDMS) and TiO 2 nanoparticles through a simple one-step dip-coating method, resulting in the formation of PVDF@PDMS/TiO 2 membranes featuring heterogeneous interfaces. Through heat treatment at 120 °C, a durable three-dimensional textured surface was fabricated, exhibiting a water contact angle of 170.2°, which confirms its remarkable superhydrophobic properties. The membrane demonstrated outstanding performance in oil–water separation, achieving a separation efficiency greater than 99%, a high flux of 1100 L m⁻ 2 h⁻ 1 , and effective removal of organic dyes through the photocatalytic activity of TiO 2 . Antibacterial testing demonstrated over 99% inhibition effectiveness against both Staphylococcus aureus and Escherichia coli . Moreover, the membrane retained a contact angle above 160° when exposure to strong acidic or alkaline conditions, indicating excellent chemical stability. These characteristics suggest that the developed multifunctional nanofibrous membrane with a hierarchical wrinkled structure exhibits significant potential for the efficient treatment of complex industrial oily wastewater systems. Graphical abstract
研究领域:
材料科学
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环境工程
·
纳米技术
·
膜科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Dongzhen Chen,Yang Li,Jianzhao Gao,Meng Zhang,Junhao Liang,Tao Fu,Xiaoming Wu,Xinhai He,Liangjun Xia,Weilin Xu
Intelligent wearables with integrated biomechanics and biomolecule multimodal sensing systems are crucial for personalized healthcare. However, the modes of action of biomechanics and biomolecule sensing work in different ways. Hence, a method for manufacturing biomimetic fibers made of polyvinylidene fluoride (PVDF)@silver (Ag) is initially devised, and a textile carrier serves as a link for multimodal sensing of biomechanics and biomolecules. PVDF nanofiber membranes are created using a one-step electrospinning process . Next, by lowering the silver ion’s reduction potential, compact and homogenous Ag nanoparticles (NPs) are formed in-situ on the high-curvature PVDF fibers. Consequently, a PVDF@Ag fiber membrane with a piezoelectric response and a localized surface plasmon resonance (LSPR) effect is created, making it suitable for wearable sensors that can detect secreta molecules as well as muscle movements. PVDF@Ag fiber is twisted, taking inspiration from the spiral structure of butterfly antennae. Compared to untwisted, twisted PVDF@Ag fiber, this produces a surface-enhanced Raman scattering (SERS) output signal that is more stable and can resist for signal attenuation caused by tensile deformation during wearable sensing. The “fingerprint” spectra of SERS enable noninvasive extraction and detection of secretion signals at sweat and respiration. Additionally, a plausible correlation between the range of secretions produced and health-related data is examined. Additionally, the integrated PVDF@Ag by polyester fabric exhibits superior air permeability , moisture absorption , and antimicrobial properties. And, this multimodal sensing mechanism has an algorithm implanted with deep learning support. All things considered, the PVDF@Ag fiber functions as a bridge between biomolecules and biomechanics, which is essential for applications involving wearable healthcare management.
研究领域:
材料科学
·
生物医学工程
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Tianci Lv,Fubin Liu,Mengqian Xiao,Ying Liu,Litao Wang,Guihua Gao
In this study, a novel hierarchical pore MIL-101(Cr) foam (HPF-MIL-101) was designed and prepared using the sacrificial template method with NaCl as the sacrificial template. This method involved grinding, heating, and washing the NaCl template to produce HPF-MIL-101, with PVDF as the binder and MIL-101(Cr) as the adsorbent. This preparation process is both straightforward and cost-effective, avoiding the use or generation of any organic reagents, thereby offering an environmentally sustainable approach for producing metal-organic framework (MOF) composites. The prepared HPF-MIL-101 exhibited excellent adsorption capabilities for both anionic dye (methyl orange, MO) and cationic dye (methylene blue, MB). The adsorption process followed a pseudo-second-order kinetic model and Friedrich isotherm model, indicating a multilayer adsorption. This is further supported by the Weber-Morris intraparticle diffusion model, which divided the adsorption process into three stages. Furthermore, the adsorption process was consistent with the Freundlich isotherm model, with a correlation coefficient ( r ) greater than 0.96. HPF-MIL-101 can also be used as an adsorbent for solid phase extraction (SPE). Therefore, an SPE method combined with high-performance liquid chromatography (HPLC) was developed using HPF-MIL-101 as the adsorbent to analyze five fluoroquinolones (FQs) in water samples. This analytical method showed good linearity in the range of 30–2000 ng·mL −1 , with excellent linear correlation coefficient ( r = 0.9991–0.9999), reasonable extraction recoveries ranging from 80.39 to 112.7 % (RSD ≤ 7.9 %), and low limits of detection (8–30 ng·mL −1 ). Overall, the results indicated that HPF-MIL-101 not only had a simple, environment-friendly, and pollution-free preparation process but also can be reused for enrichment and detection of trace FQs in water. Thus, HPF-MIL-101 exhibits immense application potential in environmental pollutant removal and also provides a valuable reference for the preparation and application of other MOF composites.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Qian Wang,Juan Li,Qiuyueming Zhou,Ting He,Zhaoliang Cui,Young Moo Lee,Weihong Xing
Dissolved organic matter (DOM) is recognized as a crucial factor contributing to the irreversible fouling of ultrafiltration membranes. Quartz crystal microbalance with dissipation (QCM-D) offers insights into the kinetics of fouling layer formation and its structure in-situ on a model membrane. However, a clear correlation between the membrane fouling process and the adsorption-desorption results obtained from QCM-D has yet to be established. In this study, piezoelectric β-phase PVDF membranes were prepared, and their fouling behavior in response to three model compounds (humic acid (HA), dextran (DEX), bovine serum albumin (BSA), and their mixed solutions was examined. It was firstly proposed that the spin-coated model PVDF membrane surface exhibited a typical β-phase structure, characterized by regular undulations resulting from strong stretching effects. A novel double layer piezoelectric sensor, consisting of a β-phase layer over a piezoelectric quartz substrate, was designed for QCM-D analysis to assess the mass and stiffness variations of the absorbed DOM layer. The fouling tendency followed the order of BSA > Mixture > DEX > HA, with the foulant monomeric units having a similar molecular mass of around tens of kDa. Irreversible fouling resistance in series model as well as frequency drop in QCM-D were listed as indicators of irreversible fouling caused by foulant-membrane interaction, which realized a well-defined match for the first time.
研究领域:
膜科学
·
环境工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2022
·
IF 4.494
Rui Fang,Ruoxin Xu,Linting Zhang,Xuelei Sun,Yan Wang,Xiaoting Zhang,Jingru Zhang,Jiepu Zhang,Zhi’ang Zhang,Chunxue Zhai,Bin Cui,Lili Zhao
Flexible dielectric energy storage capacitors have important application potentials in pulsed power systems. However, low energy storage density has always been an obstacle to practical applications because it is difficult to increase the dielectric constant of flexible dielectrics while reducing dielectric loss. In this study, a strategy is proposed to solve this problem. As the filler of polyvinylidene fluoride (PVDF), a special inorganic core–shell structure is constructed. The core–shell filler structure includes a donor Y-doped BST core and acceptor Mn-doped BST shell, wrapping ZrO2 as the outermost layer (Y@M-BST@ZrO2). Through this design, the simultaneous optimization of dielectric constant and dielectric loss is finally realized in the BST/PVDF composites. When an electric field is applied, the separation of electrons and holes formed in the core–shell fillers Y@M-BST@ZrO2 enhances the composite polarization and dielectric constant of Y@M-BST@ZrO2/PVDF and meanwhile reduces its dielectric loss at 1 kHz; therefore, the composite energy storage properties are significantly improved in comparison with the sample BST@ZrO2/PVDF. In experiments, the Y@M3-BST@ZrO2/PVDF composite film has a dielectric constant of 20.9, a dielectric loss of 0.024, and an energy storage density of 7.555 J/cm3 at 600 kV/cm, which is 74.6% higher than that of BST/PVDF composite film. It reaches 2.1 times the energy storage density of pure PVDF film. This study shows that the formation of a polarization structure caused by a positioning doping in core–shell structural fillers may provide a path for functional dielectrics of high-energy-density capacitors.
研究领域:
材料科学
·
电气工程
·
复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
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.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）