JOURNAL OF MEMBRANE SCIENCE
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2021
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IF 8.742
Jian Zhao,Qinglin Huang,Shangpeng Gao,Hongwei Piao,Quan Quan,Changfa Xiao
Solar thermal membrane distillation is a promising technology for low-cost desalination and water purification . A novel photo-thermal conversion membrane composited by polyacrylonitrile (PAN) nanofiber layer and polyvinylidene fluoride (PVDF) with antimony tin oxide (ATO) as solar-thermal nanoparticles (PVDF-ATO/PAN nanofiber membrane) was fabricated by sequent electrospinning techniques. The dual-layer membrane with hydrophilic PAN and hydrophobic PVDF-ATO was examined by microscopic evaluation and contact angle measurement. In situ temperature increase on membrane superficial layer (PVDF-ATO) driven by solar light illumination was confirmed by thermal imaging system. PAN layer provides water transport channels for facilitating water flow of highly efficient membrane distillation and avoids the salting assembly during the vigorous evaporation. With the help of hydrophilic PAN layer, our PVDF-ATO/PAN nanofiber membrane can fulfill highly effective localized heating transfer with an evaporate rate of 0.93 kg m −2 h −1 , showing great potential for low-cost water desalination and scalable water purification.
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高影响因子
EUROPEAN POLYMER JOURNAL
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2020
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IF 3.862
Qinting Chen,Bin Yang,Mengya Ding,Yang Pan,Jiasheng Qian,Zhengzhi Zheng,Bin Wu,Jibin Miao,Ru Xia,Youlei Tu,You Shi
In this work, SiO 2 @PDA nanoparticles obtained by in - situ coating polydopamine (PDA) on the surface of spherical SiO 2 nanoparticles were adopted to prepare the polyvinylidene fluoride (PVDF) composite films via thermally-induced phase separation (TIPS) method with diphenyl carbonate (DPC) as the diluent. PDA was proved to cover evenly on the surface of SiO 2 nanoparticles, which was favorable to the dispersion of hydrophilic nanoparticles in the matrix. Effect of the presence of SiO 2 @PDA nanoparticles on crystallization behavior, thermal stability, mechanical properties and hydrophilicity of the composite films was intensively investigated. Heterogeneous nucleating effect on the crystallization of PVDF coupled with elevated crystallinity was found upon the incorporation of SiO 2 @PDA without altering the crystal form of PVDF. The rigidity, tensile strength as well as thermal stability of the composite films containing SiO 2 @PDA were significantly improved in comparison to both neat film and those containing unmodified nanoparticles. In addition, the hydrophilicity of PVDF composite films’ surface was remarkably enhanced with an increasing SiO 2 @PDA content, which helped to reduce the protein adsorption of the composite films considerably. The present study would supply an insight into the fabrication of PVDF composite films with desirable performance and capabilities.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2019
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IF 6.282
Zhong Yang,Jing Wang,Yiliang Hu,Chaoyong Deng,Kongjun Zhu,Jinhao Qiu
Flexible dielectric capacitors with large energy storage density play key role in modern electronic devices. Ceramic fibers with large dielectric constants are benign candidates to be introduced into the polymer matrix to enhance the energy storage density while guaranteeing the flexibility. In present work, Nd doped BaTiO 3 (NBT) fibers with and without dopamine (PDA) coating were successfully fabricated and introduced into the Poly(vinylidene fluoride) (PVDF) matrix. The dielectric constants and breakdown strength were simultaneously enhanced with a small loading of NBT filler. The subtle modulation was then performed around the filler loading at which the large energy density was obtained. With the NBT loading of 2.5 wt% and 4.2 wt%, the maximum energy density of 9.3 and 10.4 J/cm 3 were obtained in PVDF/NBT and PVDF/NBT@PDA composites, respectively. Both of experimental results and simulation indicate the effectiveness of dopamine coating on the uniform distribution of electric field and good comparability between the matrix and fillers.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Caixia Chen,Shumei Wang,Fang Han,Xiaoying Zhou,Benxia Li
The reasonable construction of composite membranes with dual functions of rapid adsorption and photo-Fenton-like oxidation degradation holds great significance in the field of wastewater purification. Herein, a poly(vinylidene fluoride)-based composite membrane (denoted as CFT/PVDF) was meticulously prepared through a nonsolvent induced phase separation (NIPS) process with the introduction of cobalt-iron metal–organic framework (CoFe-MOF) and TiO 2 (Degussa P25). The composite membrane exhibited an excellent adsorption ability for removing a variety of organic pollutants from water. With the integration of adsorptive filtration and in situ photo-Fenton-like degradation, the removal efficiency of tetracycline hydrochloride reached up to 92.9% through the CFT/PVDF membrane in one filtration process, and the remarkable performance could be maintained after ten consecutive cycles. Moreover, a group of CFT/PVDF membranes was connected in series to realize the fast and continuous wastewater treatment. The photo-Fenton-like oxidation mechanism and possible degradation pathways were proposed on the basis of active-species detections and degradation intermediates analysis. The toxicological analysis indicated that tetracycline was in situ degraded into less toxic intermediates and even nontoxic substances by the CFT/PVDF composite membrane. This work provides some valuable guidance on the construction of self-cleaning membranes for sustainable wastewater remediation and potential applications.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2023
·Vol. 98
·期 12
·2992-3003
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IF 3.4
Mohammed Karama Alsebaeai,Abdul Latif Ahmad,Boon Seng Ooi
BACKGROUND Membrane distillation (MD) is considered a viable technology to overcome the issue of water scarcity by desalination of seawater. However, the application of MD has been severely restricted by membrane-wetting phenomena. This study aims to optimize the desired mixed-matrix hollow-fiber (HF) membrane conditions that have anti-wetting characteristics for efficient desalination. Response surface methodology based on central composite design was used to predict and optimize the permeate flux and salt rejection (SR). The combined effects of polymer (polyvinylidene fluoride, PVDF) concentration, nano-fumed silica (NFS) particle loading, coagulation bath temperature (CBT) and air gap distance (AG), as well as their interactions in terms of desalination performance, have been investigated. RESULTS The linear factors (NFS, CBT), the quadratic effects of all variables, as well as the interacting terms between (PVDF, NFS), (PVDF, CBT) and (NFS, CBT) had significant effects for both pure water and permeate fluxes. For SR, only PVDF presented a linear effect, while a quadratic effect was obtained in (NFS, AG) and an interaction effect was obtained between PVDF and NFS. Under optimal conditions of PVDF (15.03 wt%), NFS (1.21 wt%), CBT (54.85 °C) and AG (9.9 cm), the optimal mixed-matrix HF membrane demonstrated higher experimental average values for pure water and permeate fluxes, which reached up to 11.95 and 11.61 kg m −2 h −1 respectively, and an SR of 99.96% as compared to the pristine membrane. CONCLUSION Our research provides an efficient anti-wetting NFS/PVDF mixed-matrix HF membrane, indicating that the optimal membrane possesses high potential for the direct contact membrane distillation (DCMD) process. © 2023 Society of Chemical Industry (SCI).
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jingxuan Zhao,Hongxu Liu,Peng Xue,Yuchao Qi,Ziwei Lv,Ruijia Wang,Yucheng Wang,Shulin Sun
In the process of removing dye wastewater, the membrane surface is susceptible to contamination, resulting in reduced performance and limited dye separation efficiency. A single hydrophilic modification layer is not enough to achieve effective separation of different types of dyes. The present research designed a "double layer protection" method in order to overcome the above deficiencies. A solution of dopamine (DA) coated carbon nanotubes (CNTs-COOH) was covered on the surface of the polyvinylidene fluoride (PVDF) membrane by deposition, followed by grafting a layer of chitosan (CS) polymer brushes on its surface. The spatial double layer structure provides an excellent barrier effect and effectively reduces the contamination of dyes. When filtering different types of dyes, effective filtration of anionic and cationic dyes through the electrostatic effect of the first layer, the adsorption of CNTs in the second layer and the hydration layer of both layers. All membranes have excellent rejection properties. More importantly, the membranes also had good chemical and mechanical stability and their serviceability was not degraded. Therefore, the prepared PVDF-based multi-layer composite membranes behave a potential application prospect in the wastewater purification field.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Jie Liu,Ruilong Zhang,Lulu Wang,Yue Liu,Xiaohua Tian,Xiaohui Dai,Jianming Pan,Jiangdong Dai
It is a great challenge to fabricate superwetting catalytic membranes with intrinsic self-cleaning capacity for highly stable and effective water purification by simple, mild and energy-efficient manufacturing technologies. Herein, diffusion-induced interfacial self-assembly and polyphenol-mediated strengthening strategies were employed to fabricate tannic acid -mediated layered double hydroxide hybridizing PVDF superwetting catalytic membranes (named as TA@CoFe-LDH@PVDF). The simultaneous phase transformation/in-situ synthesis of CoFe-LDH nanosheets and subsequent coordination assembly with tannic acid (TA) was implemented. Superhydrophilic and underwater-superoleophobic properties were achieved through the cooperation effect of the rough microstructures of CoFe-LDH nanosheets and the strong hydration ability of TA molecules. This enabled efficient separation of various oil-in-water emulsions with more than 99 % separation efficiency and permeation flux up to 593.9 L m -2 h −1 bar −1 in cross-flow filtration. Furthermore, due to the reducibility of TA molecules that promoted the M n +1 /M n + cycle, TA@CoFe-LDH@PVDF membrane exhibited high static degradation efficiency and kinetics (nearly 100 % in 5.0 min) toward methylene blue by PMS activation. The degradation rate constant (1.04 min −1 ) was 2.67 times compared to that of CoFe-LDH@PVDF. Surprisingly, it was found that the dynamic mass transfer process in the membrane significantly accelerated the catalytic kinetics, resulting in a degradation rate in dead-end filtration was 23.89 times higher than that under static conditions. Additionally, it was proved that assembled TA could inhibit and reduce metal ion leaching during the catalytic and separation process. This simple manufacturing process of multifunctional membranes with superior performances offers a high application potential in wastewater treatment.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Li Chen,Rui Cui,Weiguo Pan,Jiangdong Dai,Minjia Meng,Xiaohui Dai,Jianming Pan
Efficient separation of single rare earth element such as neodymium (Nd) has become an important research topic due to the supply crisis which seriously restricts the application and promotion of rare earth permanent magnets. PVDF-based separation membranes prepared by non-solvent induced phase separation (NIPS) method usually exhibited hydrophobic surface properties resulting in performance attenuation and operation cost increase. This article applied an easily available NADES from betaine and lactic acid to regulate and control the coagulation bath of a polymer inclusion membrane (PIM) for the separation of Nd, Sm and Dy ions. Evidences for the formation of DES were characterized via 1 H NMR and FT-IR, and betaine showed more obvious changes than lactic acid during the formation of DES via hydrogen bonds . With the help of DES, pores on the surface were much larger and richer, and the migration of P O and P–O groups to the lower epidermal layer of the membrane made the surface layer become more hydrophilic. DES accelerated the liquid-liquid demixing process and led to faster membrane-forming speed and typical finger-like macrovoids and short vertical penetration channels, which could be observed at high DES contents, and a DES content of 5 wt% was found the most optimal considering the overall permeability and separation performances. As an effective means to improve membrane's performances, adding hydrophilic NADESs at a proper ratio in the coagulation bath would be conducive to form more porous structures, higher surface hydrophilicity, optimized permeability and separation performances.
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高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yang Wang,Zhen Chen,Yixin Wu,Yu Li,Ziyu Yue,Minghua Chen
Lithium-ion batteries (LIBs) have achieved a triumph in the market of portable electronic devices since their commercialization in the 1990s due to their high energy density. However, safety issue originating from the flammable, volatile, and toxic organic liquid electrolytes remains a long-standing problem to be solved. Alternatively, composite solid electrolytes (CSEs) have gradually become one of the most promising candidates due to their higher safety and stable electrochemical performance. However, the uniform dispersity of ceramic filler within the polymer matrix remains to be addressed. Generally, all-solid-state lithium metal batteries without any liquid components suffer from poor interfacial contact and low ionic conductivity, which seriously affect the electrochemical performance. Here we report a CSE consisting of lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), polydopamine (PDA) coated Li6.4La3Zr1.4Ta0.6O12 (LLZTO) (denoted as PDA@LLZTO) microfiller, polyacrylonitrile (PAN), and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP). Introducing only 4 μL of liquid electrolyte at the electrode|electrolyte interface, the CSE-based cells exhibit high ionic conductivity (0.4 × 10–3 S cm–1 at 25 °C), superior cycle stability, and excellent thermal stability. Even under low temperatures, the impressive electrochemical performance (78.8% of capacity retention after 400 cycles at 1 C, 0 °C, and decent capacities delivered even at low temperature of −20 °C) highlights the potential of such quasi-solid-state lithium metal batteries as a viable solution for the next-generation high-performance lithium metal batteries.
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高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yingdong Yang,Bin Yang,Mengning Luo,Yuqing Yang,Yang Wang,Jibin Miao,Shun Wang,Zhengzhi Zheng,Jiasheng Qian,Ru Xia,Yuchao Ke,Youlei Tu
In this study, polyvinylidene difluoride (PVDF) lithium battery (LIB) separators were prepared by nonsolvent- induced phase separation (NIPS) technique, and effect of vermiculite nano-sheets (VNs) on the performance of PVDF separator was studied by altering the proportions of VNs added. The microscopic morphologies of PVDF films were observed by scanning electron microscope (SEM), and it was found that the incorporation of two-dimensional VNs greatly improved the thermodynamic instability of PVDF/N, N-dimethylacetamide (DMAc) solution, which further induced the formation of long finger-like pore structure , leading to improved porosity and electrolyte uptake rate of the prepared separators. Meanwhile, differential scanning calorimeter (DSC) analysis showed that the presence of VNs decreased PVDF's crystallinity and greatly improved the thermal stability of the separators primarily owing to VNs’ two-dimensional structure as well as excellent thermal stability. When the VNs content reached 7.0 wt%, the ionic conductivity of the separator increased from 0.300 mS⋅cm −1 to 1.679 mS⋅cm −1 , coupled with significant improvement in both mechanical properties and battery performance. The present study provides a facile method for preparing LIB separators with high safety and superior performance.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuanming Tan,Zhongqiao Sun,Hao Meng,Yide Han,Junbiao Wu,Junli Xu,Yan Xu,Xia Zhang
MOFs/polymer hybrid membranes combine the special surface activity of MOFs and the excellent carries nature of porous polymer and thus exhibit unexpected adsorption/separation performances in the solid-phase extraction. In this paper, a new kind of MOFs/polymer composite membrane , MIL-68(Al)/PVDF have been fabricated for the first time through blending the MIL-68(Al) nanoparticles and polyvinylidene fluoride (PVDF) casting solution and following the lyotropic phase transition. Some means such as SEM, XRD and FT-IR are used to character the structure of these hybrid membranes. The membrane performances including the hydrophilic/hydrophobic properties, membrane porosity and membrane water flux are also measured. The effects of doping amount of MIL-68(Al) on the structure and performances of MIL-68(Al)/PVDF hybrid membranes are discussed. Two persistent organic pollutants : p -nitrophenol (PNP) and methylene blue (MB) are chosen as main adsorption objects to evaluate the adsorption activity of MIL-68(Al)/PVDF hybrid membranes. The influences of various conditions on the adsorption activities are investigated in detail and the optimum adsorption conditions are determined. All the MIL-68(Al)/PVDF hybrid membranes exhibit enhanced adsorption capacity compared to pristine PVDF, and the adsorption activities of hybrid membranes are promoted continually with the increasing doping contents of MIL-68(Al). The adsorption thermodynamics analysis indicates that the adsorption process is mainly characterized by Langmuir monolayer adsorption and chemical adsorption . The coordination bonding formed between NO 2 of PNP and Al(III) of MIL-68(Al), and the acid-base interaction between the sulfur of MB and Al(III) of MIL-68(Al) may be responsible to the highest removal efficiency of PNP and MB. The good dynamics adsorption and regeneration performances indicate the prospect applications of these MOFs/PVDF hybrid membranes in the separation of organic contaminants from industrial waste water.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Hailong Liu,Xiangjun Liao
The effects of additive, fluorocarbon special surfactant (FS-30), on the mechanism of phase inversion, morphology and separation performance of the PVDF membranes formed by non-solvent induced phase inversion (NIPS) method from the PVDF/LiCl/FS-30/DMAc system were investigated. The addition of FS-30 significantly improved membrane performance and achieved a simultaneous increase in the pure water flux and BSA rejection of the membrane, which was of great value for membrane application. With the addition of FS-30, the pure water flux increased from 114.68 LMH of the original membrane M0 to 393.76 LMH of the blend membrane M7. At the same time, the BSA rejection rate of the membrane was also increased continuously when the FS-30 content was less than 5 wt% and reached 99.48% at M5. The change in membrane properties can be attributed to the phase inversion process as well as the morphological structural features of the membrane. The addition of FS-30 increased the porosity and improved the hydrophilicity of the membrane by 28.06%. However, the average pore diameter of the membrane was reduced from 0.339 μm to 0.241 μm and a special “stage pore” structure was produced due to the unique properties of FS-30. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) imaging showed that FS-30 was lost during the coagulation bath and did not remain on the membrane, but affected the crystal composition of the α-phase and β-phase in PVDF membrane as well as promoted the phase inversion process to instantaneous phase separation. Meanwhile, the effect of FS-30 on the morphology of the membrane was characterized by scanning electron microscopy (SEM), and the morphological changes of the membrane was analyzed from the aspects of thermodynamics and kinetics of the casting solution in combination with the phase inversion process of the membrane. It was found that the influence of FS-30 on the kinetics of the casting solution did not balance the effect on the thermodynamic instability, and the thermodynamic effect still dominated, making the FS-30 blend membrane have a more obvious asymmetric structure. Moreover, the effect of the blend membrane on the rejection of algae in surface water and bacteria in sewage was also characterized with the help of chlorophyll fluorescence technique and bacterial inoculation culture experiments respectively, and the result confirmed that the FS-30/PVDF membranes had excellent properties.
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高影响因子
危险品化学品经营许可证（带存储）