JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Junyang Zhang,Yacong Yang,Zechun Sun,Danyang Zhao,Yingxiu Gao,Tianhan Shen,Yan Li,Zongli Xie,Yuning Huo,Hexing Li
Membrane technologies offer great potential in desalination and wastewater treatment . However, the serious issue of membrane fouling results in the unsatisfactory sustainability and reusability for treating wastewater containing high level of organic foulants. In this work, a photocatalytic membrane reactor system combining Ag@BiOBr photocatalyst and polyvinylidene fluoride (PVDF) ultrafiltration with remarkable anti-fouling property was constructed. The integrated Ag@BiOBr/PVDF photocatalytic ultrafiltration membranes were prepared by blending Ag@BiOBr nanoparticles (NPs) into PVDF membrane via phase inversion method. The membrane separation performance and fouling resistance were studied in a cross-flow ultrafiltration system using bovine serum albumin (BSA) as the model foulants. Compared with the pristine PVDF membrane, the hydrophilicity and surface smoothness of composite membranes were promoted by photocatalyst-incorporation, the Ag@BiOBr/PVDF membrane with the optimal Ag@BiOBr blending content of 2.0 wt% achieved both enhanced water flux and higher BSA rejection efficiency. More importantly, the mechanism of anti-fouling and self-cleaning performances were further studied, the photocatalysis process based on Ag@BiOBr/PVDF membrane effectively decomposed the BSA foulant into broken protein with induced change of carbonyl, ionic bond and hydrogen bond contents in BSA foulants via the active radicals, weakened the intermolecular force of BSA foulants to prevent membrane pore blockage. Meanwhile, the broken protein peptide chains with more negative charges could result in the strength of electrostatic repulsive forces between BSA molecules and membrane. As a result, the BSA foulant could be stably removed in the Ag@BiOBr/PVDF photocatalytic ultrafiltration system under visible light irradiation, achieving the excellent anti-fouling performance by preventing the membrane pore blockage and foulant adhesion. We believe the Ag@BiOBr/PVDF photocatalytic membrane presented in this study will be one example among many photocatalyst-membrane combinations that can be further pursued for organic pollutants removal. In particular, we expect the theoretical support can present a great opportunity to design novel photocatalytic membranes with sustainable anti-fouling performance.
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高影响因子
Journal of Materials Chemistry C
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2023
·Vol. 11
·期 14
·4614-4622
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IF 6.4
Xingmin Liu,Jinling Tong,Jijie Wang,Shaowei Lu,Dongxu Yang,Hongmei Li,Chunzhong Liu,Yutong Song
Flexible piezoelectric pressure sensors have a great application prospect in wearable electronic products due to the advantages of low cost, fast response speed and a self-powered system. However, traditional films based on piezoelectric ceramic/polymer materials face problems such as poor dispersion and insufficient polarization, which hinder the piezoelectric performance of pressure sensors. In this work, MXene was introduced to modify the surface of barium titanate (BaTiO3), which was blended with poly(vinylidene fluoride-trifluoroethylene) (PVDF-TrFE) matrix. An electrospinning method was adapted to fabricate BaTiO3/MXene/PVDF-TrFE composite films. This work proposed a new microscopic sensing mechanism. In addition, this MXene-modification strategy could improve the dispersion of BaTiO3 into the PVDF-TrFE matrix, increase the polarization efficiency and enhance the piezoelectric performance of the sensors. The results showed that the composite film with 0.15 wt% MXene could achieve a remarkable output voltage of 7.6 V. In addition, the tensile strength of the composite film with 0.15 wt% MXene (20.8 MPa) was 77.8% higher than that without MXene (11.7 MPa). Meanwhile, the β phase content of the composite film could reach 81.04%, and the crystallinity increased from 39.49% to 50.31%. The fabricated piezoelectric pressure sensor had a wide detection range (0.2–400 kPa) and a short response time (56 ms). Besides, even after undergoing over 5000 compression cycles, it maintained a stable piezoelectric response. This pressure sensor could quickly respond to joint movements and strenuous exercises in humans. Therefore, this pressure sensor showed great advantages and potential in the application of human motion monitoring.
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高影响因子
ENERGY
·
2023
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IF 9
Xirong Yue,Xu Ji,Haiyang Xu,Bianfeng Yang,Mengqi Wang,Yuan Yang
In this paper, GO-TiO 2 /PVDF composite ultrafiltration membranes were prepared for slightly polluted ground water treatment with high efficiency and low energy consumption. The TiO 2 nanoparticles solidly loaded on GO reduced the agglomeration between GO sheets, and the grafting of GO-TiO 2 nanocomposites by polyethylene glycol (PEG), partially grafted onto the surface of TiO 2 nanoparticles, prevented the agglomeration between TiO 2 nanoparticles. GO-TiO 2 was used as an additive to prepare GO-TiO 2 /PVDF composite ultrafiltration membrane by non-solvent induced precipitation phase separation method, and the fouling resistance and hydrophilicity of the membrane were improved. The structure and morphology of the composite ultrafiltration membranes were characterized using FTIR, SEM and contact angle testers, and the water flux and fouling resistance of the composite ultrafiltration membranes were evaluated using the ultrafiltration method, and investigate the effectiveness of the composite ultrafiltration membranes in treating slightly polluted ground water. The 0.05% GO-TiO 2 /PVDF composite ultrafiltration membrane has better hydrophilicity and fouling resistance, with a pure water flux of 280.3 L/(m 2 ·h), 2.1 times higher than that of the PVDF membrane. In an experiment using GO-TiO 2 /PVDF composite ultrafiltration membrane to filter campus lake water, the removal rates of COD , DOC and aromatic compounds (UV 254 ) were increased by 15.8%, 54.2% and 55.4% respectively compared to using PVDF membrane, and the GO-TiO 2 /PVDF composite ultrafiltration membrane has excellent filtration effect for slightly polluted ground water.
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高影响因子
Materials Today Communications
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2023
·
IF 3.8
Jinmin Zhao,Juanli Chen,Liting He,Youhua Cao,Chengqiang Peng,Jing Fang,Zhongyu Duan,Hao Li
Polyvinylidene fluoride membranes (PVDFMs) are frequently used in oil-water separation due to their stable properties, high porosity, and modification easily. However, the pollution, low separation efficiency, and low recovery rate of PVDFMs have limited the oil sewage treatment. This work is based on dopamine-modified PVDFMs, which prepared hydrophilic separation membranes by attaching hydroxymethylated lignin (HAL) to PVDFMs. Lignin was hydroxymethylated to improve its hydrophilicity. Additionally, HAL was assembled on the surface of PVDFMs with the effect of dopamine (DA) and 3-aminopropyltriethoxysilane (KH550). The effect of the ratio of DA and KH550 (D: K) and HAL concentration on the hydrophilic effect was explored. The modified membranes exhibited considerable separation efficiency (>99 %) for several kinds of oil-water emulsions and could be recycled multiple times. This green modification method using lignin provides an environmentally friendly solution for modifying PVDFMs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
·
IF 4.2
Danni Ye,Fengfeng Gao,Guoliang Zeng,Xingfang Zhang,Xiaogang Hao,Jun Li,Zhong Liu,Zhiyong Ji
An electroactive bismuth oxybromide/polyvinylidene difluoride/carbon black(BiOBr/PVDF/CB) composite film electrode was fabricated that had a bromide ion trap (Br–-trap) effect obtained by prereleasing of Br– under reduction potential. The Br–-trap BiOBr/PVDF/CB film electrode was used for the selective extraction of Br– from salt lake brine by electrochemically switched ion exchange (ESIX) technology. Moreover, an industrially scalable ESIX pilot system was designed and the effects of different process parameters were investigated. In the ESIX system, the obtained film electrode exhibited efficient adsorption quantity, and remarkable selectivity owing to its special ion trap effect. The extraction capacity of Br– reached 67.10 mg g–1 with the separation factors of 2.06 and 7.13 for Br–/Cl– and Br–/NO3–, respectively, and the desorption efficiency of the film electrode remained at 95.4% after seven repeated cycles. It manifested that the pilot system with the Br–-trap BiOBr/PVDF/CB film electrode is expected to provide a novel direction for practical industrial Br– extraction.
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高影响因子
ACS Applied Energy Materials
·
2022
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IF 6.959
XiaoYa Hao,Qiong Fu,YaFei Hou,YuanJie Yan,TingYu Fu,Jing Cuan,Peng Du,LaiHui Luo,WeiPing Li
Both high discharge energy density (Ud) and charge–discharge efficiency (η) for nanocomposites are crucial to the development and application of modern electronic devices. However, the large dielectric contrast and ferroelectric phase greatly limit the improvement of Ud and η of poly(vinylidene fluoride) (PVDF)-based nanocomposites. Herein, Bi2O2CO3 (simplified as BOC) nanosheets with low dielectric constant and wide bandgaps and linear poly(methyl methacrylate) (PMMA) were filled into PVDF by solution casting to fabricate x vol % BOC/PAPF (PAPF is short for PMMA/PVDF) nanocomposites. The contributions of BOC nanosheets and linear PMMA, especially for the BOC nanosheet, have been systematically studied. Both experimental and simulation results show that BOC nanosheet and PMMA could improve the breakdown strength and reduce the dielectric loss and leakage current of nanocomposites simultaneously, realizing Ud and η improvement at the same time. As a result, the 1.0 vol % BOC/PAPF nanocomposite shows the highest energy storage performance with Ud = 13.68 J/cm3 and η = 85.72%, which is much superior to PVDF. Therefore, this study might provide a proof-of-concept for constructing nanocomposites with excellent Ud and η concurrently.
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CHEMICAL ENGINEERING RESEARCH & DESIGN
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2023
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IF 3.9
Hongyu Liu,Jiafeng Zhao,Xin Wen,Jun Zhang,Huan Zhang,Huicai Wang,Junfu Wei
In this work, CoFe 2 O 4 (CFO)−PVDF catalytic membrane was fabricated by coupling CFO into PVDF membrane. It can activate peroxomonosulfate (PMS) to oxidize contaminants. Therefore, the catalytic membrane can realize filtration and catalytic oxidation of dyes simultaneously. The single rejection rate of the CFO 2 −PVDF membrane is about 70% and catalysis alone can remove 62.37% AR18 within 110 min. In comparison with filtration and catalytic oxidation separately, the removal rate of the catalytic membrane has a visible increase which can reach 100% within 70 min. The mechanism reveals that hydroxyl radical (·OH), sulfate radical (SO 4 · − ) and 1 O 2 nonradical played about 13% parts, 27% parts and 60% parts in catalytic oxidation of dyes, respectively. The mechanism includes both radical and nonradical oxidation. The catalytic membrane has a good application for different type of dyes. The removal rate can still maintain at 86% after reused for five times since the catalyst CFO can renew from Co 3+ to Co 2+ through self recovery. Furthermore, the results confirm that the catalytic membrane has a good anti-fouling ability and low metal ions leaching risk.
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CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Linlin Zhou,Tao Yang,Kang Wang,Enhui Wang,Laipan Zhu,Kuo-Chih Chou,Hailong Wang,Xinmei Hou
The flexible polyvinylidene difluoride (PVDF)/6H–SiC composite films are fabricated to overcome the natural brittleness of hexagonal SiC. Yet the electrical output of the piezoelectric nanogenerator (PENG) based on the composite film needs to be further improved. Here, PENG and hybrid nanogenerator exploiting both triboelectric and piezoelectric effects (T-PENG) based on PVDF/6H–SiC composite films are assembled. The PENG based on the PVDF/15 wt% 6H–SiC composite film shows the open circuit voltage ( V oc ) of 16.81 V. The T-PENG achieves the bridge rectified voltage of 65.70 and 136.58 V when subjected to the external force of 1.1 and 4.9 N, indicating 3.91 and 7.39 times the output of the PENG under the same force, which is the highest value compared with the reported nanogenerators based on SiC and SiC composites. This work breaks through the limitation of low mechanical energy utilization efficiency of film-based PENG and provides a feasible way to enhance the electrical output of nano power sources.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2022
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IF 9.879
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Incorporating inorganic ceramic fillers in organic polymer matrix has been demonstrated as the major and effective strategy for excellent energy storage performance. Nevertheless, the excessive addition leads to the deterioration of breakdown strength and energy density , thus impedes the practical application. Herein, a completely new idea of preparing high-entropy oxide (Eu 0.2 Bi 0·2 Y 0·2 La 0·2 Cr 0.2 ) 2 O 3 (EBYLCO) nanofiber fillers is proposed and the EBYLCO-P(VDF-HFP)/PMMA nanocomposites are fabricated with an ultralow filling content. The enhanced entropy in the lattices results in the local polymorphic distortion and effectively increases the degree of the structural disorder. The random stress field and random electric field are remarkably enhanced. The pinning effect produced by the local polymorphic distortion restricts the movements of long polymer chains, which builds a stronger cross-linked network structure, reduces the loss under the strong electric field and further promotes the breakdown strength of the nanocomposites. Besides, the charge-shielding layers between polymer and nanofillers block the injection and transmission of space charges, which also contributes to high breakdown strength. Combining the enhanced breakdown strength of 509.4 kV mm −1 with the significantly increased polarization, the nanocomposite releases a maximum energy density of 15.13 J cm −3 and energy efficiency of 71%. This work is expected to provide a novel design paradigm for the nanofillers and further improves the energy storage capability for the dielectric capacitors.
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CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Cheng Han,Huan Zhang,Quan Chen,Tao Li,Lingjian Kong,Hui Zhao,Lirong He
Directional sensors endowed by inherent anisotropic structure have drawn great attention in intelligent sensing systems. Unidirectional lyophilization is the mainstream technique to architect anisotropic structure particularly for water dispersible systems as the ice template can be readily removed at the melting point of water (0 °C). However, it is impractical for water insoluble polymers such as piezoelectric polymer systems as it features extremely low lyophilization temperature (for instance, −61 °C). So far, no piezoelectric polymer derived anisotropic devices has been realized. In this work, for the first time, we succeeded the constructing of anisotropic PVDF/Mxene device with directionally oriented micropores through delicate formulation design which enables the maintaining of oriented template even at temperature above 0 °C. As a result, the as-fabricated PVDF/Mxene composite foam exhibits distinct anisotropic behavior, featuring compressive modulus along the direction of penetrating microchannels being approximately 1.7 times of that in the orthogonal direction. The anisotropic foam is applied as directional sensor with piezo-current as the output signal, which displays a 3.93-fold higher sensitivity difference in the direction perpendicular to the microchannel than in its orthogonal direction. Moreover, the foam exhibits the highest sensitivity of 41.3nA/kPa over pressure range of 2.5–20 kPa, which outperforms state-of-the-art polymer piezoelectric sensors. This novel strategy provides a practical avenue for architecting water-insoluble polymer-derived devices with anisotropic structure in a green and energy-saving manner, which could spur innovations from the fields of electromagnetic interference shielding, energy storage, piezoresistive, thermal insulation and so on wherever anisotropic characteristic is desired.
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高影响因子
Nano Energy
·
2022
·
IF 19.069
Yanhua Cui,Zengkai Wang,Binrong Li,Yan Yan,Ruibo Xu,Minjia Meng,Yongsheng Yan
Piezoelectric materials have been widely used in photocatalytic systems as it forms a built-in electric field to facilitate the migration of photo-induced charge-carriers. Herein, we report a three-dimensional (3D) porous g-C 3 N 4 /LiNbO 3 /PVDF membrane with an enhanced fluid-induced piezoelectric field for photocatalytic hydrogen evolution reaction (HER). The freezing phase inversion strategy is critical to the formation of piezoelectric sensitive β phase PVDF. The unique 3D porous membrane structure and the fluid-induced piezoelectric potential synergistically contribute to the HER efficiency under white light illumination. The as-prepared g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric photocatalytic membrane (19.6875 cm 2 in size) exhibited HER rate of 136.02 µmol h −1 , which was even higher than that of the g-C 3 N 4 /LiNbO 3 powder sample (111.8 µmol h −1 ) with the identical mass of catalyst particles . In-situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS) demonstrates a better water affinity of the porous g-C 3 N 4 /LiNbO 3 /PVDF piezoelectric membrane prepared by the freezing phase inversion than other PVDF membranes prepared by traditional phase inversion and vacuum drying methods. Piezoelectric force microscopy (PFM), in-situ piezoelectric and piezoelectric current measurements further visualized the fluid-induced piezoelectric field on 3D g-C 3 N 4 /LiNbO 3 /PVDF membrane, by which boosting the HER efficiency.
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高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
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IF 4.291
Jing Li,Guoyun Zhou,Yan Hong,Wei He,Shouxu Wang,Yuanming Chen,Chong Wang,Yao Tang,Yukai Sun,Yongkang Zhu
Wearable electronic devices with biocompatibility and stability to monitor the practical human physiological states are urgently expected for some intensive disease recovery or healthy fitness improvement. In this work, a highly sensitive piezoelectric sensor with the aid of polythiophene (PT) promoting polyvinylidene Fluoride (PVDF) from α-phase to β-phase was designed. Electric-sensitivity of 4.961 V/N is obtained at the low-pressure and 0.09 N periodic pressure positively produces considerable output open circuit voltage. It is proved that PT facilitates PVDF to accumulate charge carriers at their interfaces, resulting in interface polarization and thus extremely piezoelectric sensitivity. Reliability test suggested the sensor stays stable performance after a long-term (~2.6% decline after 5000 cycles) repetitive deformation. Through the practices of our assembled wearable sensor demonstrating its powerful ability in recording human joint movement and breathing, which also shows that it is very promising in online movement monitoring of personal health.
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高影响因子
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