CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2019
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IF 1.911
Ruyi Cao,Juanjuan Zhou,Weiwei Chen
Membrane fouling is a major problem in membrane bioreactors (MBRs). In this study, membrane fouling caused by membrane rejection and adsorption was study. Filtration tests indicated that membrane rejected SMP, causing membrane pore blockage and then forming a gel layer. Batch adsorption experiments showed that adsorption of SMP onto PVDF membrane was a spontaneous physical adsorption process. Meanwhile, the absolute value Δ G of adsorption of SMP onto D3520 was higher than that of adsorption of SMP onto PVDF membrane, so SMP preferentially adsorbed onto D3520 rather than PVDF membrane. Thus, the effect of ARs on reducing the SMP concentration was investigated. It was found that, 6 g of D3520 was suitable for adsorption of SMP. This physical adsorption involved external film diffusion, intra-particle diffusion, and surface adsorption. The Redlich–Peterson isotherm model performed best in terms of describing this equilibrium data. The mechanism of membrane fouling mitigation was verified by MBR simulation system. A case study of AR–MBR system was conducted. The results showed that addition of D3520 can effectively alleviate the development of membrane fouling.
研究领域:
环境工程
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水处理
·
膜技术
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DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Xinwen Zhou,Haoran Pei,Zhicheng Li,Haihao He,Yinghong Chen
The piezoelectric pressure sensors, which have emerged as core components of intelligent sensing systems, exhibit significant application values in flexible electronics and human-machine interaction. In this study, we innovatively developed a micro-pyramid array sensor (MPAS) based on PVDF/WS 2 nanosheets (NSs) nanocomposites. The PVDF/WS 2 NSs nanocomposites were prepared by using the solid-state shear milling (S 3 M) technology and then elaborately integrated into a precisely designed micro-pyramidal architecture through microinjection molding (μIM) strategy. Under the very strong shear stress fields of μIM process, the spontaneous alignment of PVDF molecular chains and WS 2 NSs along the flow direction has been achieved. The fabricated sensing microdevices exhibit high sensitivity (128 mV/kPa) within a 10 N pressure range, along with 1 mm spatial resolution comparable to the level of human tactile perception. Furthermore, based on fabrication of the above microdevice, we also established an intelligent recognition system through combining multi-stage signal processing algorithms with a convolutional neural network (CNN). The resulting MPAS could achieve 100 % classification accuracy for three English letters. By setting an intensity threshold for the sensor arrays, the constructed recognition system could achieve 2 37 (≈1.37 × 10 11 ) password combinations, which is equivalent to the security level of an 11-digit decimal password lock system. Such an interesting and smart approach has demonstrated a unique security authentication methodology for intelligent electronic devices, and exhibits the promising application prospects in artificial intelligence-based precision recognition systems and advanced human-machine interaction interfaces.
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2018
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IF 2.21
Chuanhui Xu,Jianfeng Fan,Daosheng Yuan,Yanpeng Wang,Yukun Chen
Peroxide-induced dynamic vulcanization of poly (vinylidene fluoride)/silicone rubber (PVDF/SR) blends was studied in this paper. We controlled the size of rubber particles by changing the rotor speed , and discussed the influence of shearing on the particle diameter and the particle diameter polydispersity ( d p ). The size of SR particle was confirmed to be decreased with increasing the rotor speed. However, a good matching degree of shearing and crosslinking rate helped the SR phase to achieve a uniform crosslinking, as well as a narrow d p . In this particular PVDF/SR system, the suitable rotor speed was found to be 90 rpm, at which the d p reached a minimum of 1.1981 and 1.1614 for the P9S1 and the P7S3, respectively. At last, we discussed the influences of the macroscopic breaking energy ( E dk ) and the coalescence ( P ) on the number-average particle diameter ( D n ) of the SR. This work is thus devoted to construct a model for predicting the particle size in dynamic vulcanization of PVDF/SR blends.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
Journal of Materials Chemistry C
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2026
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IF 5.1
Han Qiu,Yang Xiao,Mohong Xu,Yiming Zhang,Hezhi He,Zhiwen Zhu
The development of high-performance flexible piezoelectric materials is essential for next-generation wearable and self-powered electronic devices. Poly(vinylidene fluoride) (PVDF), a representative piezoelectric polymer, suffers from an intrinsically limited piezoelectric response, which is primarily governed by the content and orientation of the electroactive β-phase. Conventional strategies for β-phase enhancement often involve complex processing with limited efficiency and scalability. Here, we report a facile and scalable electrospinning strategy for fabricating PVDF nanofiber mats with uniform and tunable diameters ranging from 100 to 1000 nm, achieved by regulating polymer molecular weight and solution parameters. A systematic investigation reveals a pronounced diameter-dependent enhancement of the β-phase content, with finer nanofibers exhibiting significantly higher electroactive phase fractions. To further improve the piezoelectric performance, a synergistic post-treatment combining multi-temperature thermal annealing and bias-controlled grid-corona poling was employed, leading to enhanced crystallinity and more efficient dipole alignment. As a result, ultrafine PVDF nanofibers with diameters of approximately 100 nm achieved a β-phase content of 95.1%, a crystallinity of 0.541, and an effective piezoelectric coefficient of 136.0 pC N−1, which is approximately 4–5 times higher than that of commercial PVDF films, together with a high sensitivity of 362.0 mV N−1. This work elucidates the coupled effects of nanoscale confinement and post-treatment on the structure–property relationships of PVDF nanofibers, providing practical insights for the scalable development of high-performance piezoelectric polymer materials.
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DOI
高影响因子
Nanoscale
·
2026
·
IF 5.1
Pingping Wu,Lin Li,Qilin Guo,Sijing Zhang,Yuanzhen Zhou
Flexible nanostructured sensors that combine electrical conductivity, mechanical robustness, and multimodal recognition capability are crucial for next-generation wearable electronics and intelligent human-machine interfaces. This study reports a dual-mode flexible sensor based on a bilayer PEDOT(MXene)-PVDF(HFP) composite membrane (denoted as PMPH), rationally designed via electrochemical polymerization and solvent-driven interface regulation. Through dual-dopant optimization and dimethyl sulfoxide-induced structural rearrangement, the PEDOT chains exhibit a transition from benzenoid to quinoid configurations, while MXene nanosheets provide a highly conductive and mechanically resilient framework. The resulting PMPH membrane displays superior conductivity, large stretchability (up to 1200%), and stable pressure and strain responses. The dual-mode flexible sensor not only distinguishes stretching and pressing behaviors but also achieves an intelligent classification accuracy of 92.13% through a machine-learning-assisted data recognition model.This study demonstrates a simple yet efficient strategy to couple conductive polymer-MXene hybrids with flexible fluoropolymers, bridging materials design and intelligent sensing toward advanced wearable devices.
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2026
·
IF 13.2
Chao Xie,Weikai. Kong,Zijian Wu,Dandan Yang,Yahui Li,Yulian Li,Jiandong Lu,Junyong He,Peidong Hong,Lingtao Kong
The filtration-assembled catalytic composite membrane enable high-density catalyst loading with improved exposure of active sites. Given the cost efficiency of iron-based catalysts, inhere, a high-density Fe 3 O 4 /Ti 3 C 2 T x @PVDF catalytic composite membrane was successfully fabricated via filtration-assembled anchoring Fe 3 O 4 nanoparticles to the superior surface of Ti 3 C 2 T x . The structural and functional properties of the composite membrane were systematically elucidated through comprehensive characterization. Leveraging the outstanding catalytic performance of Fe 3 O 4 /Ti 3 C 2 T x , efficient degradation of acetaminophen (ACT) was achieved. In the ∙OH dominated M-5 + PMS system, 93.2% ACT removal was attained within 60 min. The degradation pathways and underlying mechanisms were thoroughly investigated. Furthermore, a novel MBR + CMR system was developed for advanced treatment of pharmaceutical wastewater, significantly enhancing the removal of pollutants from secondary effluent. The hybrid system exhibited remarkable treatment efficiencies, with 91.7% TOC removal and 99.7% NH 4 + -N removal. Finally, future perspectives on scalable membrane fabrication, potential application domains, and technology integration are discussed.
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2021
·
IF 2.168
Xiaoxin Zhang,Shuai He,Weiqiang Lian,Guirong Peng,Shuohai Liu,Zaiji Zhan
In the article, PVDF-based composites reinforced by MWCNT and phenolic epoxy resin were prepared by solution casting method to get a material with excellent mechanical properties and high dielectric properties and breakdown strength when conductor is as filler. The experimental results demonstrate that dielectric constant of m-MWCNT/EP/PVDF composites (εr
= 32 at 100 Hz) is twice times higher than that of the EP/PVDF composites, and is about three times higher than that of the pure PVDF. The dielectric loss is not higher than that of the others (Tan δ = 0.3 at 100 Hz). The breakdown strength of the composites is higher than 100 MV/m, which is superior to most of composites modified with conductors. The breakdown strength for most of composites modified with conductors is under 100 MV/m. The elongation at break of m-MWCNT/EP/PVDF composites keeps 500% and the tensile yield strength increases continuously.
研究领域:
高分子材料科学
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介电材料
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功能复合材料
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材料物理
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纳米复合材料
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DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Wei Chen,Zheng Xing,Ying Wei,Xinyuan Zhang,Qingguo Zhang
Gel-polymer electrolytes (GPEs) are of great interest to build high-performing rechargeable electrical double-layer capacitors (EDLCs) owing to the combination of good electrochemical properties and improved safety. Herein, we report a quasi-solid-state GPE for EDLCs from a mixture of the poly (vinylidene fluoride- co -hexafluoro propylene) (PVDF-HFP) and ionic liquid 1-ethyl-3-methylimidazole tetrafluoroborate ([EMIM][BF 4 ]), which avoids the leakage of liquid electrolyte and the low conductivity of common solid electrolyte . The intermolecular forces of GPE was characterized by in-situ infrared (IR) spectroscopy, and the interactions between ionic liquid and polymer were also analyzed. The prepared GPE was observed to be easily procurable, excellent transparency, high thermal safety (thermal stability up to 320 °C) and outstanding electrochemical properties at room temperature (wide electrochemical stability window of 3.91 V versus SS (SS being stainless steel foils) and high ionic conductivity of 6.9 × 10 −3 S cm −1 ). The specific capacitance, the maximum specific energy, and the maximum specific power of the fabricated symmetrical supercapacitor had been determined to be 161.8 F g −1 , 89.89 Wh kg −1 , and 8 kW kg −1 , respectively. Moreover, the EDLC shows extraordinary electrochemical behaviors and cyclic stability over up to 10 000 cycles at 25 °C with 86% capacitance retention under a current load of 2 A g −1 . The experimental results indicate the excellent potential of the [EMIM][BF 4 ] ionic-liquid-based gel polymer electrolyte for EDLCs.
研究领域:
电化学
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储能
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材料科学
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高分子科学
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超级电容器
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Yunfeng Wang,Yingang Gui,Shasha He,Jiacheng Yang
In this study, through structural design, thin film doping modification, and electrode preparation, a high-performance triboelectric nanogenerator (TENG) has been achieved, and an electromagnetic generator is incorporated as an energy supplement to construct a self-powered sensing system for gas alarm and environmental monitoring. The high porosity of NiO derived from MOFs, high charge accumulation, and the high charge carrier mobility of N-MWCNTs promote charge capture and transfer, greatly enhancing the output performance of the triboelectric nanogenerator. Under the optimal doping ratio, the open-circuit voltage can reach 860 V, and the maximum short-circuit current up to 47 μA, sufficient to power 600 LEDs lights, achieving a power density of 10.45 W/m 2 . Meanwhile, MXene/Carbon/Ecoflex electrodes were fabricated to enhance the contact efficiency between the thin film and electrodes, further obtaining an open circuit voltage of 1020 V. This work provides a viable solution for the design of high-performance hybrid nanogenerators.
研究领域:
纳米技术
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能量收集
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材料科学
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环境监测
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传感器与执行器
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 59
·期 2
·715-727
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IF 4.5
Li Bin,Zhou Mengjing,Wu Aolin,Liu Haiying,Du Li,Su Lihua
Preparation of composite hydrogels by in situ polymerization (SP) using choline chloride (ChCl), acrylamide (AM), and urea (U) as raw materials for deep eutectic solvent (DES), with the introduction of PVA and PVDF as fillers into DES. Characterization of the composite hydrogels was conducted using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). This study analyzed the pressure sensitivity, piezoelectricity, swelling behavior, and mechanical properties of the composite hydrogels. The results indicate that due to the dipole–dipole interactions between PVA and PVDF, the composite hydrogels exhibit excellent pressure sensitivity and piezoelectric performance. When the ratio of PVA to PVDF is 1:1, the composite hydrogels exhibit optimal performance, with a 3.37-fold increase in pressure sensitivity and a 6.49-fold increase in piezoelectricity compared to other ratios. This research provides a method for preparing composite hydrogels with excellent piezoelectric performance and pressure sensitivity.
研究领域:
材料科学
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高分子科学
·
化学工程
·
纳米技术
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DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xuyang Li,Zongxue Yu,Liangyan Shao,Xiaofang Feng,Haojie Zeng,Yuchuan Liu,Runxuan Long,Ximei Zhu
In order to effectively solve the two major problems of photocatalyst recovery and membrane fouling , this research combines photocatalyst and membrane separation technology . In this study, the NH 2 -MIL-88B(Fe)/CDs@GO material with good photocatalytic properties was synthesized by hydrothermal method and mechanical stirring, and the photocatalytic membrane was obtained by vacuum filtration. The results show that the NH 2 -MIL-88B(Fe)/CDs@GO membrane can effectively intercept and degrade methylene blue (MB). After 10 cycles, the rejection rate of MB can still reach 99.5%, which is about 2.5 times of pure GO membrane (40%). After 15 min of visible light irradiation, the Flux recovery rate (FRR) of NH 2 -MIL-88B(Fe)/CDs@GO membrane can reach 95%, and the antifouling performance is excellent. In this study, the composite photocatalytic membrane shows excellent stability, photocatalytic performance and self-cleaning property, which is conducive to widening the application prospect of wastewater treatment .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
DESALINATION
·
2026
·
IF 9.9
Chen Wu,Hongai Zheng,Xiqian Zheng,Daquan Zhang,Lizhi Zhang,Feiyu Chen,Lifeng Yang,Junliang Wang
FeOCl/MIL-88A composites were used to modify the surface of polyvinylidene fluoride (PVDF) membranes. • Simultaneous high pollutant degradation (94% RhB, 91% MB) and remarkable antifouling with FRR increased from 61% to 93%. • Low Fe leaching (0.102 mg/L) and sustained performance over 5 cycles confirm excellent reusability and safety. • The heterojunction between FeOCl and MIL-88A facilitates charge separation and generates ·OH and·O 2 − . Catalytic membranes fabricated by surface loading of active materials have shown great potential for antifouling improvement. This study investigated a photo-Fenton synergistic membrane separation process by fabricating a FeOCl/MIL-88A composite on the surface of PVDF membranes, which markedly enhanced the membrane performance. The modified membrane (FM-3) maintained high pure water flux (518.2 L/m 2 ·h·bar) and porosity (80%) while exhibiting hydrophilicity (contact angle of 8°). Compared with the pristine membrane, FM-3 achieved a substantially higher HA rejection (78%) with only a minor loss of permeability, alleviating the conventional permeability–rejection trade-off. Under visible-light-driven photo-Fenton conditions, FM-3 demonstrated high degradation efficiencies of 94% for RhB and 91% for MB, with stable performance over 5 cycles. Moreover, the membrane demonstrated remarkable antifouling performance, with a flux recovery ratio (FRR) of 93% and an irreversible fouling rate (R ir ) of only 7%. Finally, a possible membrane antifouling mechanism is proposed:·OH and·O 2 − are the primary active species in the catalytic process. The formed heterojunction facilitates efficient charge separation and promotes the Fe 3+ /Fe 2+ cycle. DFT calculations further confirmed the electron transfer direction from FeOCl to MIL-88A, providing theoretical support for the proposed heterojunction mechanism. This work provides a novel and effective approach for designing high-performance catalytic membranes with synergistic separation and anti-fouling functions for sustainable wastewater treatment. Download: Download high-res image (145KB) Download: Download full-size image
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高影响因子
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