SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chen Zhao,ShanShan Wang,Nianping Wang
Dip coating technology is often used for hydrophilic modification of PVDF membrane surfaces due to its significant modification effect, simple process and low cost. Nevertheless, the relatively feeble binding forces between coating molecules and between the coating and the substrate membrane often raise concerns about the stability of modified membranes. This study utilized PAA and Sac-100 to develop a hydrophilic and negatively charged coating to improve the anti-fouling characteristics of PVDF membranes in the process of oil/water separation. Two modification reagents underwent ring opening crosslinking reaction and ultimately deposited on the surface of PVDF membranes in the form of a network polymer, thereby solving the stability problem of the modification coating. After the modification, the surface microstructure of the membranes remained unchanged, while the average pore size fell from 0.37 μm to 0.32 μm. The water contact angle of the modified membrane decreased to 39° suggesting an excellent hydrophilic property. The modified PVDF membrane exhibited exceptional resistance to fouling in the oil/water separation experiment, demonstrating a consistent permeance value of 212 L m −2 h −1 bar −1 that was four times higher than that of the original membrane. Following the cleaning process, the permeance of the modified membrane could be restored to a level of 74.5 %.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujia Tong,Chenxuan Shao,Jinbo Chen,Fiona Hammond Quarcoo,Changqing Miao,Xiaohui Ju,Weixing Li
High hydrophobicity of polyvinylidene fluoride (PVDF) membrane surface results in adsorption of oil droplets and membrane fouling . A hydrogel coating with crosslinking network of polyvinyl alcohol (PVA), pyrogallol (PG) and Fe(III) based on PVDF membrane was proposed. Hydrogen bonds between PVA and PG in water were regulated by ethanol to form a uniform hydrophilic hydrogel coating on PVDF membrane. Chelation between PG and Fe 3+ significantly enhanced hydrogel adhesion. The surface energy of the developed PVDF-PVA/PG-Fe 3+ membrane was 39.96 mJ·m −2 , 2.71 times that of the pristine PVDF membrane, while its adhesion to oil is close to 0 μN. The permeate flux reached 1341 L·m −2 · h −1 at 0.1 bar for separating isooctane-in-water emulsions with good separation efficiency (>99 %) and cycling stability. The developed membrane could also effectively separate petroleum ether-in-water and dodecane-in-water emulsions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yang Tao,Gongduan Fan,Xin Lin,Chenjian Cai,Xingfeng Cao,Zhimin He,Jing Luo,Kai-Qin Xu
To mitigate the profound impact of Microcystis aeruginosa algal bloom outbreaks on aquatic ecosystems and human health, a piezoelectric T-BaTiO 3 /Ag 3 PO 4 -PVDF composite photocatalyst (T-BTO/AP-PVDF) was successfully synthesized in this study. The catalyst inactivated 97.12% of Microcystis aeruginosa within 4 h by the combined effect of ultrasound and sunlight, and the inactivation rate remained above 88% after five cycles of reuse, which exhibits excellent inactivation effectiveness and stability. Under the conditions of piezo-photocatalytic, the analysis of the physiological properties of algal cells showed that T-BTO/AP-PVDF produced a large amount of •OH, which were active species that could effectively inactivate the algal cells and promote the degradation of organic matter, thus preventing the occurrence of secondary pollution. The composite photocatalysts were characterized using XRD, SEM, XPS, FTIR, PFM, and WCA. Combined with the results of quenching experiments, possible mechanisms for the inactivation of Microcystis aeruginosa by T-BTO/AP-PVDF were proposed. The application results in actual water bodies further proved that T-BTO/AP-PVDF is a new method for effectively inhibiting cyanobacterial bloom outbreaks and shows promising potential for application.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Weiwei Li,Wenying Zhou,Na Lin,Mengting Liu,Jing Liu,Ying Wang,Bo Wang,Dengfeng Liu,Mengxue Yuan
High dielectric permittivity ( ε ) but low loss polymeric composites have presented wide applications. To elevate the overall dielectric performances in raw zinc oxide (ZnO)/polyvinylidene fluoride (PVDF), the prepared aluminum oxide (Al 2 O 3 ) encapsulated ZnO core-shell particles were incorporated into the polypropylene (PP) modified PVDF blend to generate high ε and breakdown strength ( E b ) but low loss nanocomposites. The Al 2 O 3 shell’ impacts on the dielectric performances of the ZnO/PVDF-PP were investigated. The results indicate that the insulating Al 2 O 3 shell induces concurrent interparticle polarization and intraparticle polarization leading to evidently enhanced ε , and effectively restrains the leakage current resulting in simultaneously suppressed loss and elevated E b in the nanocomposites. Further, the introduced alumina shell can induce traps and capture charge carrier thus resulting in enhanced E b . Through facilitating the intra-particle polarization and repressing the charge migration, the 50 wt% ZnO@Al 2 O 3 /PP-PVDF present a much higher ε (16) and E b (11 kV/mm) but lower dielectric loss (0.08), respectively, far exceeding 9.6, 9 kV/mm and 0.18 at 100 Hz for the unmodified ZnO nanocomposites. Further, the dielectric parameters of the nanocomposites can be effectively tuned via tailoring the Al 2 O 3 shell thickness. The fitting via the Havriliak-Negami equation theoretically interpret the experimental results and uncover the underlying multiple polarization mechanisms. This work provides deep insight into the design and development of flexible polymeric nanodielectrics with eminent integrated dielectric properties for appealing applications in electronic device and power system.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiangcong He,Wenna Liu,Hui Fu,Chris R. Bowen,Jizhong Liu,Xie Li,Abdul Rehman Akbar,Jinju Zheng,Weiyou Yang
Incorporating perovskite nanocrystals (PNCs) into poly(vinylidene fluoride) (PVDF) is an effective method to improve the performance of PVDF-based piezoelectric nanogenerators (PENGs). The conventional techniques are typically performed via a two-step process, namely, the synthesis of PNCs and then introducing them into the PVDF matrix. Here, we report the exploration of flexible PENG with boosted performance by in situ growth of Zr-doped Cs2Ag0.3Na0.7InCl6 double perovskites (ZCDP) within the PVDF matrix (PENGin). The as-constructed PENGin delivers an open-circuit voltage of 44.4 V and a short-circuit current density of 10 μA cm–2, both of which are more than 2 times those of PENGs built by a conventional two-step process and ∼6 and ∼9 times the best ones of in situ grown Cs2InI6@PVDF-based PENGs ever reported, respectively. The enhanced performance could be ascribed to the optimized spontaneous polarization, thanks to the uniform dispersion of PNCs with a solid ZCDP/PVDF interface within the matrix, which collectively facilitates the electron migration and aggregation, thereby establishing a strong built-in electric field to amplify the dipole spontaneous polarizability. Additionally, the PENGin exhibits excellent performance with robust stability in pressure sensing, wearable energy harvesting, and DC power applications, representing its promise toward practical use.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wen Li,Yongrun Dong,Ting Xie,Tongzhou Li,Chuang Ning,Tao Huang,Zequan Li,Wei Gao,Bingsuo Zou
Lead-free double perovskites (DPs) have superior phase stability and optical properties, which make them competitive for future applications in illumination and displays. However, the preparation of DPs was mainly based on high-temperature heating and hydrochloric acid as a solvent to form powders, which increased the risk and cost of the preparation process and limited its further application. In this study, the growth of Cs2NaInCl6: Sb3+ DPs in polyvinylidene difluoride (PVDF) films was achieved using an in situ fabrication strategy with DMSO as the solvent. The prepared Cs2NaInCl6: Sb3+@PVDF composite films (CFs) can achieve a bright blue emission under 302 nm irradiation. To achieve the optimal luminescent performance of CFs, the photoluminescence (PL) intensity of Cs2NaInCl6: Sb3+@PVDF CFs under various in situ preparation conditions was compared. In addition, the photoluminescence quantum yield (PLQY) of CFs was increased from 0.72% to 83.77% by adjusting the doping amount of Sb3+, and the fluorescence lifetimes t1 and t2 were 131.08 and 1048.52 ns, respectively. Temperature-dependent PL spectroscopy and density functional theory (DFT) calculations indicate that these excellent optical properties are derived from the self-trapped excitons (STEs) at the [SbCl6]3– octahedron and [InCl6]3– octahedron connected via Cl–Na–Cl. The CFs also demonstrated excellent environmental stability, maintaining a relatively stable PL intensity even under conditions of water immersion, high temperatures, and ultraviolet (UV) radiation. Finally, we used the CFs to assemble a blue light-emitting device (LED), which showed good and stable blue emission performance at different currents. This work can provide a new idea for preparing DPs, which is conducive to promoting their commercial application in high-performance optoelectronic devices.
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Small Methods
·
2024
·
IF 10.7
Lirong He,Xingang Liu,Cheng Han,Dehui Wang,Qi Wang,Xu Deng,Chuhong Zhang
For polyvinylidene fluoride (PVDF) based piezoelectric composites, epitaxial growth of ZnO nanorods (ZnO-nr) piezoceramic layer on PVDF is an effective way to improve their piezoelectric performance. However, the crystal nucleus of ZnO featuring polar surfaces that cannot be directly attached to hydrophobic PVDF with low surface energy. Herein, direct ink writing (DIW) 3D printing is employed for the first time to create β-PVDF reservoirs with significantly enhanced surface energy, facilitating the attachment and epitaxial growth of ZnO-nr. The printed β -PVDF reservoirs designed with programmed macro-pores and abundant inner micropores, enable a higher loading of ZnO-nr by more than one magnitude, thereby boosting the electro-mechanical response. The resulting PVDF/ZnO core–shell piezoelectric energy harvester (PEH) delivers an output voltage of 33.2 V, as well as an unprecedentedly high relative output voltage of 2.76 V/wt.%, which is 2.63 times that of the state-of-the-art 3D-printed PVDF/piezoceramics PEHs. Furthermore, it can differentiate subtle human motions whereas hybrid PEHs cannot distinct. This work demonstrates that the DIW 3D printing approach offers a simple and convenient design idea for creating high performance PEHs.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Shusu Shen,Qifeng Fan,Honglin Li,Lunbo Xu,Ganwei Zhang,Renbi Bai
Developing a stable MOF-modified membrane for efficient treatment of oily wastewater remains a challenge. In this study, NH 2 -MIL-88B(Fe) (NM88B) was deposited on the commercial polyvinylidene fluoride (PVDF) membranes, and grafted with perfluorohexane-1-sulfonic acid potassium salt (PFHx) to achieve quaternization modification. This reaction proceeds in an environmentally friendly manner due to the absence of any catalyst. The introduction of fluorine atoms through grafting PFHx resulted in the modified PVDF membrane (NPF) demonstrating remarkable underwater superoleophobic property with an underwater oil contact angle at ∼180°. In separation of various oil-water emulsions, the NPF membrane afforded a high permeation flux (up to 2043 L·m −2 ·h −1 ) and rejection rate (∼99 %). The oil rejection of NPF membrane was >99 % after 10 filtration cycles of n -hexadecane-water emulsion, and the pure water flux of the recovered membrane was kept at 82.65 % of the original flux, indicating a very good reusability and stability. Filtration of mixed dye/oil-water emulsions showed that the NPF membrane remove 99 % of both oil and dye from the mixture. This work provides a simple and stable modification of PVDF membrane, exhibiting remarkable underwater superoleophobicity and hydrophilicity , thereby harboring substantial prospects in the treatment of oily wastewater.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Chen Zhao,Yiheng Wang,Nianping Wang,Ruilin Chen,Rui Yin,Xiangxi Li
The in-situ growth of ZnO is often used to modify membrane surface for enhanced hydrophilic and antibacterial properties due to significant modification effect, simple process and low cost. Nonetheless, some polymer membranes (such as PVDF membrane) lack active sites for ZnO growth on their surfaces, resulting in a small number of particles and unstable binding. This study utilized PDA/PEI to modify PVDF membranes for adequate active sites to capture Zn 2+ ions via the chelation action. Thereafter, nano ZnO can be synthesized easily via the alkalization reaction and thermal breakdown of Zn 2+ . Upon improving the modification conditions, ZnO particles were evenly distributed on the PVDF membrane's surface, leading to a reduction in membrane pore size from 0.38 nm to 0.29 nm. The water contact angle of the ZnO/PDA-PEI modified membrane dropped from 130° to 19°, indicating a significant enhancement in hydrophilicity. The modified membrane demonstrated enhanced anti-fouling performance in the oil/water separation experiment, achieving a steady permeance of 298 L·m −2 ·h −1 ·bar −1 , which was sixfold that of the original membrane. In the antibacterial experiment, the modified membrane exhibited significant antibacterial efficacy against both E. coli and S. aureus .
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Polymers
·
2024
·Vol. 16
·期 24
·3540
·
IF 4.7
Siyang Wu,Luyu Zhang,Xiaochun Qiu,Yuntai Guo,Liangliang Dong,Mingzhuo Guo,Jiale Zhao
This study reports the development of highly conductive and stretchable fibrous membranes based on PVDF/PAN conjugate electrospinning with embedded silver nanoparticles (AgNPs) for wearable sensing applications. The fabrication process integrated conjugate electrospinning of PVDF/PAN, selective dissolution of polyvinylpyrrolidone (PVP) to create porous networks, and uniform AgNP incorporation via adsorption-reduction. Systematic optimization revealed that 10 wt.% PVP content and 1.2 mol/L AgNO3concentration yielded membranes with superior electrical conductivity (874.93 S/m) and mechanical strength (2.34 MPa). The membranes demonstrated excellent strain sensing performance with a gauge factor of 12.64 within 0–30% strain and location-specific sensing capabilities: moderate movements at wrist (ΔR/R0: 98.90–287.25%), elbow (124.65–300.24%), and fingers (177.01–483.20%) generated stable signals, while knee articulation exhibited higher sensitivity (459.60–1316.48%) but significant signal fluctuations. These results demonstrate the potential of the developed conductive porous PVDF/PAN composite fibrous membranes for applications in wearable sensors, flexible electronics, and human-machine interfaces, particularly in scenarios requiring moderate-range motion detection with high reliability and stability. The findings suggest promising opportunities for developing next-generation wearable sensing devices through the optimization of conjugate electrospun fibrous membranes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Pei Yang,Shuang Wang,Huihui Liu,Linghui Meng,Yongping Bai,Jinmei He
The development of multifunctional Metastable intermixed composites (MICs) is a highly coveted objective in this field. Inspired by trees, its excellent ability to grasp soil plays an important role in energy conversion. Here, leaf-like PVDF/Al@CNTs (PDC) colloids with an energy conduction network of CNTs were prepared by strong shearing and precipitation in poor solvent. This trinity system achieved synchronous super-hydrophobicity, high safety, and excellent combustion performance. The synergistic effect of CNTs, micro-clusters of PDC and β-PVDF greatly increased the water contact angle (WAC) of the samples, achieving a WAC of 140° when CNTs were added at 3 wt%. The high conductivity and unique CNTs network enable PDC's security and electromagnetic shielding of PDC. Importantly, the sensitivity of the laser ignition and the ignition delay time were tuned. The reaction process of PDC was characterized by DSC-TG-MS, and the main reaction temperature decreases with the addition of CNTs. Moreover, PDC-1 exhibits the highest ignition pressure, energy release, and combustion rate. The combustion process is characterized by simplified simulations, which verify the important role of the unique network of CNTs in PDC for energy conduction during combustion. This work presents a distinctive approach for multifunctional MICs, demonstrating encouraging potential for various applications in energetic materials.
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Nanoscale
·
2025
·
IF 5.1
Li Zeng,Yuan Li,Qichao Li,Yiping Guo
Polyvinylidene fluoride (PVDF) has attracted extensive attention for flexible piezoelectric strain sensors due to its piezoelectric activity and mechanical robustness. However, practical application in small-strain monitoring occasions remains restricted by limitations such as low intrinsic piezoelectricity. Inspired by the mechanical structure of Venus flytrap's trigger hairs, this study synergistically combines modulus differentiation mechanisms with a coaxial architecture to develop core–shell nanofibers. The fiber structure comprises a rigid Polyamide 66 (PA66) core, a flexible PVDF sensing layer as the outer shell, and polydopamine-modified BaTiO3 nanoparticles (PBTO) distributed within the outer sheath. These bioinspired fibers feature a radial stiffness-flexibility combination to achieve directional stress transmission. The modified nanofiber membrane achieves an 840% enhancement in voltage output compared to pure PVDF, demonstrating bending sensitivity of Gauge Factor (GF) 221.4 and only 0.67% signal attenuation over 12 000 cyclic tests. Leveraging this amplification mechanism, the core–shell nanofibers have been engineered into bending vector sensors capable of discerning wind velocity magnitude and directional parameters. This approach shows potential for optimizing unmanned aerial vehicle flight trajectories to enhance operational efficiency.
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