Journal of Water Process Engineering
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2023
·
IF 7
Hao Jiang,Longfei Zhang,Chuntao Zhang,Xiaoming Xiao,Zhizhang Tian,Yongli Sun
Integrating the heterogeneous catalysts with the membrane matrix is a promising approach for wastewater decontamination . In this study, a ZIF-67 derived cobalt‑manganese spinel catalyst MnCo 2 O 4.5 @Carbon (MCOC) was prepared using a one-pot pyrolysis process and was then blended with a polyvinylidene fluoride (PVDF) membrane through the phase inversion method. The introduction of the MCOC catalyst not only improved the permeance of the membrane but also constructed active reaction sites within the membrane matrix. As a result, the PVDF/MCOC membranes exhibited both satisfactory degradation capabilities by activating peroxymonosulfate and favorable permeation performance. Remarkably, about 99 % of phenol (20 mg/L) can be removed within 30 min, with a water flux of 649.0 L/m 2 ∙h. Besides, the PVDF/MCOC catalytic membrane possessed favorable anti-fouling properties and stability. The flux recovery rate of the PVDF/MCOC membrane reached 85 % after three fouling/washing cycles, while the phenol removal efficiency remained consistent at 95 % after 5 consecutive cycles. Radical quenching tests and electron paramagnetic resonance analysis further indicated that sulfate radicals and singlet oxygen were the primary reactive oxygen species in the phenol degradation processes. Consequently, this work highlights an effective method to fabricate a catalytic membrane with high permeance and catalytic efficiency, potentially expanding the application of heterogeneous catalysts in wastewater decontamination.
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Membranes
·
2023
·Vol. 13
·期 9
·773
·
IF 4.2
Jun Xiang,Sitong Wang,Nailin Chen,Xintao Wen,Guiying Tian,Lei Zhang,Penggao Cheng,Jianping Zhang,Na Tang
In order to enhance the separation performance and reduce the heat loss of transmembrane for membrane distillation, the thermal efficiency and hydrophobicity of the membrane distillation need to be simultaneously enhanced. In this work, a polyvinylidene difluoride/polyethylene glycol terephthalate (PVDF/PET) hydrophobic/hydrophilic membrane has been prepared by non-solvent phase induction method. Nanosized silica aerogel (SiAG) with high porosity has been added to the composite membranes. The modifying effects and operating conditions on permeate flux and thermal efficiency in direct contact membrane distillation (DCMD) are investigated. Furthermore, the latent heat of vaporization and the heat transfer across the membranes have been compared for SiAG addition, which indicates that the composite PVDF@SiAG/PET membranes demonstrate a great potential for distillation-separation application due to their high heat efficiency.Keywords:non-solvent induce phase separation;hydrophobic/hydrophilic membrane;silica aerogel;low thermal-conductivity;membranes distillation
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高影响因子
DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 33
·11441-11450
·
IF 4
Defeng Hu,Zhongqiao Sun,Yide Han,Hao Meng,Xia Zhang
Considering the surface affinity of MOFs and separation advantages of polymer membranes, herein, a one-step interface synthesis strategy is used in the construction of Cu-BTC/PVDF hybrid membranes, in which Cu2+ ions and 1,3,5-benzenetricarboxylic acid (H3BTC) were dissolved in ionized water and n-octanol separately, and polyvinylidene fluoride (PVDF) films were laid at the interface of two immiscible solvents. As a result, Cu-BTC was generated and readily self-assembled inside the PVDF films. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and the Brunauer–Emmett–Teller (BET) method were used to characterize Cu-BTC/PVDF hybrid membranes, and Congo red (CR) was selected as the target dye to evaluate the surface adsorption activity of the hybrid membranes. Batch adsorption tests under various conditions were conducted to optimize the adsorption capacity, adsorption kinetics, isotherms and thermodynamics, which were analyzed to further explore the adsorption behavior. Based on this, the adsorption mechanism was discussed. It is worth noting that because of the π–π stacking interaction and hydrogen bonding, an extraordinary adsorption capacity of CR was achieved, and the good separation advantage and the cyclic adsorption performances endow the resulting Cu-BTC/PVDF hybrid membranes with promising applications in the removal of organic dyes from practical wastewater.
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高影响因子
Materials
·
2023
·Vol. 17
·期 1
·9
·
IF 3.4
Runkai Zhou,Hong Yang,Lianzhong Zhao,Chun Wang,Chaoqun Peng,Richu Wang,Dou Zhang,Xiaofeng Wang
In this study, polyvinylidene fluoride (PVDF) composite films were prepared by fused deposition modeling, and the effects of ionic liquid (IL) content on the printability, crystallization behavior, and electrical properties of melted PVDF were systematically investigated. The results show that the addition of IL increased the temperature sensitivity of melted PVDF and decreased its viscosity, while IL acted as a plasticizer to lower the melting point of PVDF and improve its FDM printability. The imidazole cations in IL had electrostatic interactions with the -CF2- groups in PVDF, which promoted the transformation of the nonpolar phase to the polar phase in PVDF; thus, the addition of IL was beneficial to the increase in the polar β phase. The PVDF with 20 wt.% IL contained the highest proportion of β phase content (32.59%). Moreover, the increase in polar β-phase content also increased the polarization strength of PVDF and improved its ferroelectric properties. PVDF with 10 wt.% IL had the highest residual polarization strength (16.87 μC/m2).Keywords:PVDF;3D printing;ionic liquids;piezoelectric materials;fused deposition modeling
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Journal of Water Process Engineering
·
2023
·
IF 7
Mengmeng Liu,Jianqiang Wang,Yajie Ding,Yong Zhou,Fu Liu
Viscous oil separation and its highly efficient recovery is a great challenge in oil/water separation applications. Membrane separation was considered as a prospective strategy for oil/water separation, but membrane contamination caused by the oil droplets restricted its applications significantly. We here propose a nondispersive solvent extraction strategy to efficiently recover viscous lubricant oil from emulsions via a polydopamine modified PVDF Janus membrane . The incorporated thin polydopamine layer facilitates the adsorption and diffusion of surfactant stabilized oil droplets through the membrane. We studied the influence of polydopamine coating time, the flow rate on both feed and extraction sides, the weight content of lubricant oil on the recovery of oil. The optimized membrane exhibited a 10 h accumulative flux (1595 g·m −2 ) for viscous lubricant oil in water emulsion, which was 70 % higher than the contrast PVDF membrane. The current study might significantly advance application of this novel method for highly efficient separation and recovery of viscous oils from oil/water mixtures.
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RSC Advances
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2023
·Vol. 13
·期 28
·19002-19010
·
IF 3.9
Han Runlin,Wang Chaoyue,Bi Congcong,Wang Hanli
Polyvinylidene fluoride (PVDF) has been widely studied and applied in separation membranes due to its high thermal and chemical stability and mechanical strength. However, PVDF has strong hydrophobicity, resulting in easy contamination of the membrane surface and fast flux attenuation, so it is necessary to modify the membrane surface to improve its separation selectivity and service life. In this paper, PVDF microporous membrane was used as the matrix material and graphene oxide (GO) as the separation layer material. The GO/Mn3O4/PVDF composite membrane was prepared by layer self-assembly of GO nanosheets, and the functional layer spacing was adjusted by nanometer Mn3O4 intercalation. The prepared composite membrane showed high flux and separation selectivity in the filtration of organic compounds. The results showed that the rejection of methylene blue increased from 34% to 99.5%, and the flux decreased from 3000 L m−2 h−1 to 95 L m−2 h−1 when GO nanosheets covered the PVDF supporting membrane. After the introduction of Mn3O4 nanowires in the GO interlayer, the dye rejection reached 99.9% and the flux reached 612 L m−2 h−1. Compared with the unintercalated composite membranes, the flux of the prepared composite membranes showed good stability in the treatment of methylene blue, and the rejection remained unchanged.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Linlin Zhou,Tao Yang,Chunyu Guo,Kang Wang,Enhui Wang,Laipan Zhu,Hailong Wang,Sheng Cao,Kuo-Chih Chou,Xinmei Hou
Piezoelectric silicon carbide (SiC) has been quite attractive due to its superior chemical and physical properties as well as wide potential applications. However, the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified applications. Here, flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators (PENGs) and stress/temperature/light sensors. The open circuit voltage ( V oc ) and the density of short circuit current ( I sc ) of the PENG based on the PVDF/5 wt% 6H-SiC composite fiber films reach 28.94 V and 0.24 µA cm –2 , showing a significant improvement of 240% and 300% compared with that based on the pure PVDF films. The effect of 6H-SiC nanoparticles (NPs) on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element analysis. The stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding stimuli. This study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Large depletion of fossil fuels promotes the sustainable development of renewable energy. Polymer-based dielectric nanocomposites are widely utilized owing to their ultrafast charging–discharging rate and high power density in pulse power systems, smart grids, and other electrical devices. In this paper, completely new high-entropy oxide (Eu0.2Bi0.2Y0.2La0.2Cr0.2)2O3 (in short, E) nanofibers are fabricated, and the multilayered nanocomposites are prepared with electrospinning and layer-by-layer hot-pressing processes. A high energy density of 20.11 J cm–3 and an efficiency of 64% are achieved at 598.9 kV mm–1 in the trilayered nanocomposites. First, the enhanced entropy of the lattices leads to local polymorphic distortion, which, to a certain extent, limits the movements of long polymer chains, reduces the dielectric loss, and improves the breakdown strength of the nanocomposites. Moreover, for multilayered nanocomposites, the Schottky barrier forms with the direct contact between the electrodes and ferroelectric polymer. The difference in permittivity of the materials in contact with the electrodes leads to the difference in the barrier height around the interfaces, which results in a larger local electric field and a higher breakdown strength. Besides, the multilayered nanocomposites improve the rough interfaces between inorganics and organics and reduce the probability of dielectric breakdown. This work provides a new filling strategy and structural-layer design for the application of flexible dielectric materials.
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高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Jiuyun Cui,Yibo Zhang,Yusong Pan,Jianjun Li,Atian Xie,Changguo Xue,Jianming Pan
Molecularly imprinted composite membranes are considered to be a promising technology for the selective separation of antibiotics in wastewater. However, membrane pollution still greatly limits the practical applications of these membranes, especially in oily wastewater. In this study, an anti-fouling zwitterion PVDF-imprinted composite membrane (SPICM) was synthesized using dopamine as the functional monomer and crosslinking agent in the imprinting process. First, sulfobetaine 8 was blended with a porous PVDF membrane via a surface segregation strategy. Next, dopamine self-polymerization provided effective recognition sites and endowed the membrane surface with high hydrophilicity . The SPICM used for emulsion separation and selective tetracycline hydrochloride (TC) in wastewater. The as-prepared SPICM was able to separate various emulsions under gravity with a high flux (626 L m −2 h −1 ) and separation efficiencies of up to 99%. This membrane achieved a TC separation efficiency of 88.3% in oily wastewater. Therefore, the design of SPICMs with good antifouling performance provides a new strategy for the highly selective separation of active components from oily wastewater.
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Frontiers in Chemistry
·
2023
·
IF 5.5
Li Shaofeng,Zhang Meilin,Sun Jian,Sun Jianping,Wang Ying
Polyvinylidene fluoride (PVDF) membranes are favored for their excellent properties. However, the inherent strong hydrophobicity of PVDF membranes limits their development in the field of water treatment. The objective of this study was to improve the performance of PVDF membranes using the self-polymerization, strong adhesion properties, and biocompatible effects of dopamine (DA). The PVDF/DA membrane modification conditions were simulated and optimized using response surface methodology (RSM), and the experimental design was used to investigate three main parameters. The results showed that the DA solution concentration of 1.65 g/L, the coating time of 4.5 h, the post-treatment temperature of 25°C, the contact angle decreased from 69° to 33.9°, and the pure water flux on the PVDF/DA membrane was higher than that on the original membrane. The absolute value of the relative error between the actual and predicted values is only 3.36 %. In the MBR parallel comparison test, compared with the PVDF/DA membrane, the total amount of extracellular polymers (EPS) of the PVDF membrane increased by 1.46 times and the polysaccharide increased by 1.56 times, which further showed that the PVDF/DA modified membrane had the excellent anti-pollution ability. Through Alpha diversity analysis, the biodiversity detected on PVDF/DA membranes was higher than that of PVDF membranes, which further proved its good bio-adhesion ability. These findings could offer a reference for the hydrophilicity, antifouling, and stability of PVDF/DA membranes, which would establish the foundation for the comprehensive applications in MBR.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 1
·211
·
IF 5.3
Juanjuan Zhou,Wenying Zhou,Mengxue Yuan,Xinbo Dong,Jiebing Zhang,Xuejiao Zhang,Yanqing Zhang,Xiaolong Chen,Yanrong Chen,Xiangrong Liu
An insulating shell on the surface of conductive particles is vital for restraining the dielectric loss and leakage current of polymer composites. So as to inhibit the enormous loss and conductivity of pristine nickel (Ni)/poly(vinylidene fluoride)(PVDF) composites but still harvest a high dielectric permittivity (εr) when filler loading approaches or exceeds the percolation threshold (fc), pristine Ni particles were covered by a layer of titanium dioxide (TiO2) shell via a sol–gel approach, and then they were composited with PVDF. The impacts of the TiO2coating on the dielectric performances of the Ni/PVDF composites were explored as a function of the filler concentration, the shell thickness and frequency. In addition, the dielectric performances were fitted using the Havriliak–Negami (H–N) equation in order to further understand the TiO2shell’s effect on polarization mechanism in the composites. The Ni@TiO2/PVDF composites exhibit highεrand enhanced breakdown strength (Eb) but remarkably suppressed loss and conductivity when compared with pristine Ni/PVDF because the TiO2shell can efficiently stop the direct contact between Ni particles thereby suppressing the long–range electron transportation. Further, the dielectric performances can be effectively tuned through finely adjusting the TiO2shell’ thickness. The resulting Ni@TiO2/PVDF composites with highεrandEbbut low loss show appealing applications in microelectronics and electrical fields.Keywords:dielectric properties;metal;core–shell structure;polymer composites
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JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Caini Liu,Wenyi Wang,Yanling Li,Fangyan Cui,Chengcheng Xie,Liuyong Zhu,Bojin Shan
Hybrid ultrafiltration membranes of poly(vinylidene fluoride) (PVDF) and poly(ethylene glycol)-multi-walled carbon nanotubes (PMWCNTs) have been prepared via phase inversion method. Compared with pristine PVDF membranes, PMWCNT/PVDF hybrid membranes showed a significant higher water flux (384 L m −2 h −1 ), more stable rejection rate of bovine serum albumin (BSA) and better antifouling properties because of better hydrophilicity. Besides, the antifouling properties of PMWCNT/PVDF hybrid membranes can be further reduced applying a weak electric field (direct current, about 2 V cm −1 ). More important, PMWCNTs/PVDF membrane exhibited the lowest hemolysis ratio of 0.4% ever reported, which has improved the hemocompatibility and safety of blood. Moreover, after the introduction of weak electric field, the adhesion of red blood cells is minimized. This study shows that the novel PMWCNT/PVDF hybrid membranes have excellent antifouling ability and hemocompatibility which opens up a new field for the application of PVDF membranes.
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