CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jun-Heng Fu,Qigong Zhang,Minglei Yan,Wei Tang,Yun Zeng,Yuntao Cui,Mingkuan Zhang,Hongwei Deng,Hao Kang,Xinlong Sun,Liang Qiao,Hongzhang Wang,Yang Zhao
Passive radiative cooling which dissipates heat from surfaces by reflecting sunlight and emitting radiation towards outer space, has garnered growing attention as an eco-friendly cooling strategy with zero-energy consumption. However, few studies focus on low-cost and multifunctional composite film fabricated by a straightforward and environmentally friendly method that is crucial for their large-scale applications. Herein, we introduce a facile, efficient, and scalable approach to fabricate a hydrophobic and polymer-dielectric poly (vinylidene fluoride)-hexafluoropropylene (P(VDF-HFP)@PVA hydrogel Janus film (DPP), exhibiting exceptional radiative cooling and thermal management capabilities for diverse practical applications. With the introduction of ZnO, DPP showcases the optical capability with a solar reflectance of ≈93 % and an infrared emittance of ≈96 %, endowing it with remarkable radiative cooling performance. The synergistic integration of hydrogel phase change and radiation cooling capabilities offered by the P(VDF-HFP) layer enables the DPP to achieve a subambient cooling of 8.62 °C under direct sunlight. Moreover, when applied to the thermal management of electronic devices and fruit preservation due to the phase change property, the DPP effectively reduced surface temperatures by 10 °C and 15.5 °C respectively. Its simplicity and versatility suggest that it could be widely adopted for daytime passive radiation cooling, thereby expanding its practical applications across various fields.
研究领域:
材料科学
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能源与环境科学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Hongxu Liu,Junhao Xie,Ziyi Hu,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
This work obtained separation membranes with UV-cleaning performance by adding TiO 2 -g-CS/CNTs photocatalyst to the PVDF . The positively charged chitosan (CS) and negatively charged carboxylic carbon nanotube (CNTs-COOH) can be self-assembled into the bilayer structure on the surface of TiO 2 particles through electrostatic attraction. The presence of many hydrophilic groups in CS and CNTs-COOH significantly improves the hydrophilicity of TiO 2 -g-CS/CNTs-PVDF membrane, and helps TiO 2 to be uniformly dispersed on the upper surface. TiO 2 -g-CS/CNTs promote the change of pore structure and expand the flux of the modified membrane to 4.5 times that of pure PVDF . Zeta potential demonstrates that the TiO 2 -g-CS particles successfully attracted CNTs in the PVDF matrix, and the membrane surface was still positively charged. Thus, the combined effect of the positively charged TiO 2 -g-CS and the highly adsorbed CNTs enhanced the retention of the contaminants. More importantly, there is a charge transfer between the grafted CS and TiO 2 interface to obtain a broader light absorption band. The excitation carriers provided by CNTs significantly contribute to the photocatalytic performance after transfer between TiO 2 and CS; thus, TiO 2 -g-CS/CNTs-PVDF produces higher photocatalytic activity for dye molecules (degradation rate > 97 %).
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Keduo Yan,Lan Xu,Adnan Ahmed
Due to the rapid development of information technology and the trend toward miniaturization of electronic equipment, the research on electromagnetic interference (EMI) shielding materials is rapidly moving toward low-dimensional, core–shell, and lightweight directions, with a wide range of application prospects in various fields. In this study, using pDA as a binder, poly(vinylidene difluoride) (PVDF)/Fe3O4@pDA@Ag nanofiber membranes (NFMs) with a multicore–shell structure were prepared by in situ growth of Ag nanoparticle (NP) layers on the fiber surface of electrospun PVDF/Fe3O4 NFMs fabricated in batch. Compared to PVDF@pDA@Ag NFM, the average EMI shielding efficiency (SE) of PVDF/Fe3O4@pDA@Ag NFM reached 82.31 dB because of the increased hysteresis and multireflection losses inside the NFM caused by the moderate addition of Fe3O4 NPs. In addition, the synergistic effect of Fe3O4 and Ag NPs increased the microwave attenuation and impedance matching of composite NFM, further enhancing its EMI SE.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
DESALINATION
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2022
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IF 11.211
Rui Wu,Yanyan Tan,Fangang Meng,Yuanyuan Zhang,Yu-Xi Huang
Membrane distillation (MD) is promising desalination technology for hypersaline wastewater treatment. However, traditional MD membranes are subject to low vapor flux and mineral scaling. In this study, we report the fabrication of a composite membrane composed of polyvinylidene fluoride (PVDF) and metal azolate framework-4 (MAF-4) via electrospinning. The highly porous MAF-4 provides additional vapor transfer channels and better heat insulation , thereby significantly increasing the membrane flux compared to a bare electrospun PVDF membrane. The surface chemistry of the MAF-4 surface is further tailored with fluorinated functional groups through the coordination between the fluorinated molecule and the surface Zn atom. This surface modification changes the surface wettability of the MAF-4 and thus improves the membrane scaling resistance. This study demonstrates a universal approach for preparing high flux and scaling-resistant MD membranes. In addition, the tunable surface property of MAF-4 can also be utilized to design and fabricate other types of membrane surfaces by coordinating different functional molecules.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Mingliang Zhang,Qian Ye,Qianqian Yi,Hanbin Wu,Chao Liu,Bingjie Zhang,Xinyi Li,Bin Yan
Extensive studies have been conducted on advanced oxidation processes (AOPs) for the removal of antibiotics in water environments. However, the separation and recovery of powdered catalysts from water at the end of the reaction remains a great challenge, which hinders the large-scale application of powder photocatalysts. Inspired by the high sustainability, energy efficiency, and cleanliness of photocatalytic technique in antibiotic degradation, we have developed a stable and efficient ultra-thin porous g-C 3 N 4 /β-phase polyvinylidene fluoride (CA-CNS/β-PVDF) membrane for antibiotics removal. Under the optimal reaction conditions, the tetracycline (TC) removal rate of the membrane reached 93.12 % within 2 h due to the synergistic effect of the embedded ultra-thin porous g-C 3 N 4 and β-phase polyvinylidene fluoride (PVDF). The CA-CNS/β-PVDF membrane still maintained excellent photocatalytic performance after five cycles, showing good stability and reusability. The electron paramagnetic resonance (EPR) and free radical quenching analyses suggest that the TC degradation efficiency is enhanced by the synergistic effect of free radical-non-free radical mixed pathways (•O 2 , •OH, h + , 1 O 2 ) and 1 O 2 plays an important role in the degradation process. The excellent photocatalytic antibiotics degradation performances of CA-CNS/β-PVDF membrane were still obtained in actual water samples under natural sunlight, suggesting its great application potentials. The photocatalytic mechanism, possible degradation intermediates, and degradation pathways are elucidated based on the theoretical calculations and experiments. The toxicity analysis by QSAR shows that the CA-CNS/β-PVDF membrane successfully reduces the biological toxicity of three antibiotics (TC, OTC, CIP) during the photocatalysis. In all, our work provides a universal immobilization technique of powdered photocatalysts to improve their wastewater purification efficiencies.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Bing Yang,Tingting Yu,Chenyu Yang,Weiwei Wu,Jizhou Jiang
In this work, composite films of molybdenum disulfide (MoS 2 ) with poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) were fabricated using aqueous phase transformation and hydrothermal methods, aiming at efficiently degrading tetracycline hydrochloride (TC). The findings revealed that the degradation efficiency of TC by MoS 2 @PVDF-HFP, when subjected to a combined photocatalysis process involving a simulated pressure electric field and aeration, reached a remarkable 96.11 % within 1 h-surpassing the performance observed under individual conditions. The changes in the electron density cloud on the films surface induced by the pressure electric field and the acceleration of electron transfer rate between contact interfaces were evident. Notably, the composite films exhibited a stable performance with a TC removal rate of 90.23 % after five cycles, including a relatively stable degree of mineralization. We employed Density Functional Theory (DFT) to investigate the changes in the state density of MoS 2 @PVDF-HFP under different conditions, such as compressive stress, tension, and no force. This further clarified the mechanism of piezoelectric coupling photocatalysis promoting induced charge transfer on the films surface. The research findings presented in this paper provide a promising avenue for the application of piezoelectric field-assisted photocatalysis in enhancing material performance.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2024
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IF 5.1
Lili Cao,Yuxiang Chen,Shane Feng,Yanli Su
To reduce the dielectric loss of MXene/PVDF composites near the percolation threshold, a MnO 2 /MXene hybrid structure was successfully synthesized via an ultrasonic-assisted solution process, and MnO 2 /MXene/PVDF composite films were prepared by a solution casting method. The effects of different amounts of MnO 2 nanorods on the microstructure, thermal stability, dielectric properties and mechanical properties of the composite films were investigated. At 1 kHz, the dielectric constant of 7 wt% MnO 2 /MXene/PVDF is 37.3, and the dielectric loss is as low as 0.05. The electric modulus curve, Nyquist curve and equivalent analog circuit of the composites revealed strong interface polarization and microcapacitance effects in the composites. In addition, the composite films exhibit excellent mechanical properties, and the storage modulus of the composite film loaded with 10 wt% MnO 2 is 1990.5 MPa, which is 3.44 times that of pure PVDF. This study confirms that incorporating MnO 2 nanorods into MXene/PVDF composites is an effective approach for fabricating high-performance dielectric composites.
研究领域:
材料科学
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电介质材料
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 6
·48345
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IF 2.188
Libo Wang,Yuchang Su,Jing Zhang,Hongzhi Zhang,Qiaoqiao Dong
PVDF-CoFe 2 O 4 (CFO) thick membranes were synthesized by solvent casting method. The mixed organic solvents consist of N-methyl-2-pyrrolidone (NMP) and Ethyl acetate (EA), in which the mass ratios of NMP and EA (NMP:EA = 1:0, 1:1, and 1:2) and the temperature of solvent evaporation (range from 50 to 80 °C) has been considered. The phase structure, β-PVDF phase content, and electrical and magnetic properties of these membranes were investigated to reveal the effect of EA addition and temperature on these properties. Results manifest that all samples showed coexistence of ferroelectric and ferromagnetic properties at room temperature. EA addition makes film more compact, which may be responsible for the differences in ferromagnetic properties. Adding EA and enhancing temperature resulted in phase transition of PVDF from α and γ to β, which contributed to membranes’ ferroelectric performances. In all samples, NMP:EA = 1:2 treated at 80 °C exhibits the maximum β-phase fraction and polarization (Pmax) of 87.2% and 2.398 μC cm −2 , respectively. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48345.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
Arabian Journal of Chemistry
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2023
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IF 6
Yingjian Zhai,Jing Yang
There is an urgent need for an antifouling membrane to treat the large volume of dye-containing wastewater generated annually by the dyeing and printing industry. PDA@ZnO/PVDF membranes were synthesized by doping polydopamine (PDA) and zinc oxide (ZnO) nanoparticles into the polyvinylidene fluoride (PVDF) membranes via non-solvent induced phase separation (NIPS) method in which polyvinylpyrrolidone (PVP) and lithium chloride (LiCl) were chosen as the porogens respectively. Their microstructures were characterized, and the membranes were examined for antifouling properties and membrane separation performance. The presence of PDA@ZnO nanoparticles on the PVDF membrane was evidenced by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) measurements. The addition of PDA@ZnO enhanced the mechanical strength and hydrophilicity of the nanocomposite membranes. The PVDF membranes' water permeability and antifouling properties improved following mixing modification, according to the dye filtration test. The pure water flux of PDA@ZnO/PVDF hybrid membranes changed from 260.0 L·m −2 ·h −1 ·bar −1 to 1339.2 L·m −2 ·h −1 ·bar −1 by varying the concentration of PDA@ZnO nanoparticles from 0 wt% to 1.6 wt%. The retention performance of the modified membranes was shown to be significantly superior to the pure PVDF membrane. The modified membranes with the addition of 2.0 wt% PVP and 1.6 wt% PDA@ZnO nanoparticles had highly disperse blue 79 (DB 79) retentions (88.5%), indicating that the modified membrane possessed the characteristics of a promising membrane for the purification of dye. Tests found that PDA@ZnO significantly improved the membrane's antifouling performance.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 38
·24670-24680
·
IF 4.036
Wei Qin,Along Yu,Xue Han,Junwei Wang,Jiayin Sun,Jianli Zhang,Yaqing Weng
With the increasing demand for rare earth elements (REEs) due to their wide application in high technology, their recovery and separation from waste sources has gradually come onto the agenda. Herein, a new kind of MIL-101-NH2 (M1N) MOF functionalized with diethanol anhydride (DGA) incorporated into a polyvinylidene fluoride (PVDF) membrane (DGA-M1N@PVDF) has been fabricated for the sorption of REEs from a simulated acid leaching solution of waste phosphor, which contains a large amount of REEs. FTIR, TGA, XRD, fluorescence spectra and XPS analysis were used to characterize the synthesized composite membrane. Batch tests were employed to determine the optimal sorption conditions for Y and Eu adsorbed on DGA-M1N@PVDF adsorbent, such as pH (1–5), content of M1N MOFs (0–40 wt%), contact time (10–180 min) and ion concentration (0–20 mg L−1). Maximum adsorption capacities for Y and Eu on DGA-M1N@PVDF reached 991.7 μg g−1 and 98.76 μg g−1 for trace REE solution, respectively. Moreover, a pseudo-second-order kinetic model accurately described the sorption process, and the plotted isothermal data indicated that the Langmuir model was more suitable than the Freundlich model for Y and Eu sorption with monolayer and chemical adsorption. Meanwhile, FTIR and XPS analyses revealed that the Y and Eu adsorption on the DGA-M1N@PVDF composite membrane was mainly caused by the N and O atoms of the –CONH or –COOH groups coordinated with metal ions. Furthermore, after five cycles, the recovery efficiency by DGA-M1N@PVDF for REEs remains above 82% and the XRD patterns were consistent with the original sample, which implied that the DGA-M1N@PVDF membrane has preferable stability, recyclability and good efficiency in REE separation from waste phosphor solutions.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
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2024
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IF 4.4
Jingyu Du,Yu Xue,Yuhuan Xu,Xiao Zhan,Daohai Zhang
We have successfully developed a PVDF/EAA [poly(vinylidene fluoride)/poly(ethylene acrylic acid)]-piperazine (PIP) composite nanofiltration membrane for dye isolation. In this paper, we conduct interfacial polymerization (IP) on PVDF/EAA composite membranes to generate a separation layer that aims at enhancement of the permeation flux of nanofiltration membranes. Subsequently, Fourier transform infrared spectroscopy (FTIR), contact angle, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were used to characterize the performance of the prepared samples. In addition, under the different concentrations of the PIP aqueous layer, an intensive study was resorted to gauge the effects of homotrimethylene tricarbonyl chloride (TMC) concentration and reaction time on the characteristics of nanofiltration membranes. Under the optimized situation, the pure water flux could reach 76.84 L/(m2 h) and the retention of bovine serum albumin (BSA), Congo red, and methylene blue could reach 96.34%, 97.93%, and 96.83%, respectively. Substantially, the nanofiltration membrane has good potential to be applied in dye wastewater treatment.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
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IF 9.4
Hongying Hou,Baoxiang Huang,Xiaohua Yu,Jian Lan,Sen Ming,Ju Rong,Xianxi Liu,Fangshu Chen
Organic/inorganic composite solid electrolyte has been a hot topic due to combining the merits of both components. Herein, a series of organic/inorganic composite solid electrolytes were prepared by casting method, in which polyvinylidene fluoride (PVDF) was modified with amphoteric sulfonate betaine (SB) and combined with the different contents (0 %, 10 %, 20 % and 30 %) of Li 7 La 3 Zr 2 O 12 (LLZO) and 20 % bis(trifluoromethane) sulphonyl (LiTFSI). The resultant samples were marked as 0%LLZO/SB-PVDF/LiTFSI, 10%LLZO/SB-PVDF/LiTFSI, 20%LLZO/SB-PVDF/LiTFSI and 30%LLZO/SB-PVDF/LiTFSI, respectively. As expected, composite solid electrolyte exhibited the desirable overall performances. Especially, 20%LLZO/SB-PVDF/LiTFSI membrane exhibited high ionic conductivity (1.73 × 10 −4 S/cm), wide electrochemical window (5.22 V), high Li + transference number (t Li + = 0.67) and high mechanical property, probably due to the synergistic effect of LLZO and amphoteric SB modification. Specifically, the amphoteric SB promoted the dissociation of LiTFSI and endowed PVDF matrix with the ionic conductivity, while LLZO facilitated high ionic conductivity, t Li + and mechanical property. Resultantly, Li//LiFePO 4 cell with 20%LLZO/SB-PVDF/LiTFSI membrane delivered 129.5 mAh/g at 1.0C for 200 cycles and 94.0 % capacity retention, demonstrating high application feasibility in the solid-state lithium ion battery . Furthermore, density functional theory (DFT) calculations showed that the binding energy of the amphoteric SB-Li + (C 11 H 21 NO 5 S-Li + ) system was 80.93 kcal/mol, higher than 75.55 kcal/mol of the LiTFSI system, indicating that the amphoteric SB could indeed promote the dissociation of LiTFSI.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）