Nano-Micro Letters
·
2026
·Vol. 18
·期 1
·254
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IF 38.5
Gao Chenxiang,Zhou Yijie,Huang Yun,Wang Shuhui,Ma Xiaoyan
Bioinspired bundle-sheath structure improves electrochemical and thermal stability; nanocellulose composite membranes can be used as high-performance all-solid-state lithium batteries separators.
The FFP/ASSPE has a high ionic conductivity of 2.46 × 10 −4 S cm −1 at 30 °C.
Li|FFP/ASSPE|LFP cells can maintain 77.48% capacity after 1000 cycles at 1 C, and Li|FFP/ASSPE|NCM811 cells maintain 83.94% capacity after 300 cycles of 0.1 C.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Junjie Li,Liming Liu,Syed Jalil Shah,Ying Tang,Shanliang Jiang,Guangyuan Mu,Quanru Man,Zhongxing Zhao,Zhenxia Zhao
Metal-organic frameworks (MOFs) modification and composite to chase high adsorption capacity and desorption efficiency for volatile organic compounds (VOCs) capture are a great challenge work. Seeking a suitable strategy to simultaneously promote the adsorption capacity and regeneration efficiency of MOFs is a significant practical challenge in this context. Herein, novel heat-conducting MOFs (HKUST-1) composite films were prepared for efficient and synchronous improvement of adsorption affinity and desorption efficiency. In our case, bulk Boron nitride (BN) was exfoliated into BN nano-sheets (BNNS), which were then spread as flakes on PVDF nanofibers to form a conductive network (BNNS/PVDF film, which was abbreviated as B/P film). With the aid of citric acid (CA) modification, HKUST-1 crystals were dispersed-grown on modified B/P (mB/P) film, resulting in the formation of a hierarchical pore structure in HK-mB/P film with a relatively high MOFs loading amount (45.8 wt%) and surface area (448 m 2 /g). Performance evaluation experiments showed that the toluene adsorption and desorption rates of the HK-mB 0.4 /P 0.6 film were 5.5 and 5.3 times higher than those of the powder HKUST-1, respectively. The fast adsorption rate could be ascribed to the constructed heat-conducting network and porous stacked nanofibers. Furthermore, its adsorption capacity for toluene was significantly increased up to 4.69 mmol/g at low pressure ( P / P 0 = 0.01), which was approximately-two times higher than that of pure HKUST-1. This merit was mainly attributed to the newly formed interface between HKUST-1 and mBNNS, which could strengthen the adsorption affinity for toluene by the generated unsaturated metal sites of (BNNS-CA-O|Cu|O-ligand) and π-π attraction of B-N bonds. Besides, the HK-mB 0.4 /P 0.6 film also displayed good cycling performance, with only a 3–4 % decrease in activity observed after five consecutive cycles.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ningbo Cheng,Dongyang Miao,Chao Wang,Yanyan Lin,Aijaz Ahmed Babar,Xianfeng Wang,Zhaohui Wang,Jianyong Yu,Bin Ding
Growing demand for efficient and economical cooling for indoor as well as outdoor applications, especially personal cooling in outdoor environments, is a major global challenge today. Currently, tailored optical structures with spectral selectivity are being used as cooling strategies. However, developing these photonic structures generally requires sophisticated multi-step manufacturing processes and use of multiple solvents which limits their acceptability for large-scale production and cost-effectiveness. Therefore, for the first time, herein we report the fabrication of nanosphere-structured hierarchically porous poly (vinylidene fluoride- co -hexafluoropropylene) (PVDF-HFP) fibrous fabric via a facile one-step electrospinning process based on water vapor-induced phase separation (WVIPS) technique using single solvent. The fabricated fabric with interconnected nanospheres structure and hierarchically porous fibers possessed large roughness and high specific surface area. Cooling performance of the fabricated PVDF-HFP fabrics was evaluated using skin simulators to mimic human body. The as-prepared PVDF-HFP fabric exhibits a superior average solar reflectance (∼93.7 %) and infrared emittance (∼91.9 %), yielding a temperature drop of ∼19.8 °C and ∼13.2 °C compared to the bare skin simulator and the one covered with cotton fabric, respectively, under solar intensity of ∼950 W m −2 . Additionally, excellent hydrophobicity and adsorption make designed fabrics potentially suitable materials for not only radiative cooling but also for waterproof and filtration applications.
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Materials Today Communications
·
2022
·
IF 3.662
Shaocan Dong,Weiqiu Huang,Xufei Li,Xinya Wang,Baoyou Yan,Zhen Zhang,Jing Zhong
In response to global climate change, most countries have set carbon reduction targets. Mixed matrix membranes (MMMs), which combine the characteristics of inorganic nanofillers and organic matrices, have received wide attentions because of their good permeability and selective performance for the separation of CO 2 from industrial waste gases. However, the poor dispersion, compatibility and interfacial defects often lead to poor gas separation performance. In this paper, according to the dissolution-diffusion and Lewis acid-base theories, inorganic filler of amino-functionalized Bentonite (APTES-Bentonite) with -NH 2 was firstly synthesized to improve the affinity of CO 2 . Then, the dual-functionalized MMMs of APTES-Bentonite/PVDF (A-B/P MMMs) was prepared and adopted for the separation of CO 2 /CH 4 and CO 2 /N 2 , showing the increase of 87.76% and 75.31% compared to the pristine PVDF membrane, respectively. These excellent performances were attributed to the synergistic effect of APTES-Bentonite with -NH 2 groups and PVDF with -F groups, which provide a dual-functional transport pathway for CO 2 molecules due to the interactions of host-guest. Overall, the customized A-B/P MMMs offer superior CO 2 separation performance, which provides some valuable references for large-scale CO 2 capture studies.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Man Xu,Hao Zhang,Wenhai Peng,Xingmeng Ruan,Li Chen,Xiaohui Dai,Jiangdong Dai
The treatment of oily wastewater containing water-soluble dyes has drawn attention and become a thorny issue. Aiming at removing oil droplets and dyes from wastewater, it is reported in this work the design of polyelectrolyte deposited dual functional membrane with superior separation and degradation capabilities. The hyperbranched polyamide-amine (HPAMAM) was combined with tetra (4-carboxyphenyl) porphyrin (TCPP) and phytic acid (PA) through electrostatic interaction to form an eco-friendly polyelectrolyte complex by one-step self-assembly method. Relying on affluent amine group and unique cavity structure as well as wide range of delocalized π-electron systems, TCPP@HPAMAM@PA possesses robust water binding ability and intense absorption in the visible region, endowing PVDF membrane with superhydrophilicity/underwater superoleophobicity, oil resistance and superior photocatalytic degradation properties. The dual functional TCPP@HPAMAM@PA/PVDF membranes can realize superb removal of oil droplets (oil rejection > 99 %) at high flux recovery rate with several cycles. Furthermore, the degradation efficiency of rhodamine B (RhB) and Methyl blue (MB) reaches 93 % and 96 % respectively, showing standout photocatalytic degradation performance. A facile and low-energy strategy for the modification of commercial PVDF membranes is proposed, which is not only consistent with the concept of green chemistry but also has a broad application in the separation of complex oily wastewater systems.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Wenyi Ma,Jian Pan,Wanzheng Ren,Long Chen,Lilan Huang,Shanshan Xu,Zhaohui Jiang
Despite membrane separation technology has been extensively implemented in various field, the fouling caused by bacterial and organic dye seriously impair the performance and lifespan of the membrane, the anti-fouling modification of the membrane is still a challenging. In this work, the antibacterial and self-cleaning poly (vinylidene fluoride-chlorotrifluoroethylene) (PVDF-CTFE) mixed matrix membranes were prepared by non-solvent induced phase separation method using self-made graphite carbon nitride nanosheet wrapped copper phosphide (Cu x [email protected] 3 N 4 ) as modification additive. The sequel of the incorporated Cu x [email protected] 3 N 4 nanosheet content on the morphology, pore structure and physicochemical structure of membranes was investigated in terms of pure water flux, anti-fouling and antibacterial properties. The results showed that the addition of Cu x [email protected] 3 N 4 nanosheets not only improved the hydrophilicity and mechanical property of the membranes, but also enabled PVDF-CTFE membrane with the ability of inactivation bacteria and self-cleaning, which significantly enhanced the anti-fouling performance of PVDF-CTFE membrane in complex environment. When the amount of Cu x [email protected] 3 N 4 reached 2 wt%, the mixed matrix membrane possessed outstanding comprehensive performance with the pure water flux of 641.1 L m −2 h −1 , antibacterial rate over 99% and self-cleaning under simulated sunlight, making the mixed matrix membrane a potential choice for wastewater treatment . In conclusion, this study enlightened the fabrication strategy of multifunctional mixed matrix membranes.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Lu Jing,Weili Li,Chang Gao,Menglu Li,Weidong Fei
Polymer-based dielectric capacitors are well recognized for high energy density and efficiency. However, the energy density is restricted by the deterioration of breakdown strength with excessive addition of inorganic fillers. Herein, an innovative design of the lamellar-structured BiFeO 3 @TiO 2 (BFO@TO) fillers is proposed and a small amount of BFO@TO is added into P(VDF-HFP)/PMMA blended polymer to fabricate BFO@TO-P(VDF-HFP)/PMMA composites, which delivers an outstanding energy density of 19.3 J cm −3 at 549.2 kV mm −1 . The filler possesses a BFO/TO/BFO triple-layered structure. Due to the different Fermi level, electrons are injected from TO into BFO to form electron accumulation layer and construct the heterojunction electric fields between TO and BFO layers. Heterojunction electric fields at two interfaces produced by the triple-layered structure are opposite. The opposite double heterojunction can withstand larger external electric field and improve the breakdown strength. Besides, BFO, as a narrow bandgap semiconductor, is easier for electrons and holes to separate, which further widens the width of the built-in electric field and reduces the dielectric breakdown. Electric field distribution simulations intuitively confirm the enhancement of the breakdown strength. The results provide an effective strategy to address the critical issue of improving the breakdown strength for high energy storage capability.
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International Journal of Environmental Research and Public Health
·
2021
·Vol. 18
·期 23
·12339
·
IF 3.39
Chengzhi Zhou,Yanlong Sun,Fan Zhang,Yuandong Wu
The photocatalytic degradation of minocycline was studied by using polyvinylidene fluoride–polyvinylpyrrolidone–TiO2(PVDF–PVP–TiO2) fiber mats prepared by an electrospinning technology. The influences of the TiO2dosage, minocycline concentrations, inorganic anions, pH values, and dissolved organic matter (DOM) concentrations on the degradation kinetics were investigated. A mass of 97% minocycline was degraded in 45 min at 5% TiO2dosage. The corresponding decomposition rate constant was 0.069 min−1. The inorganic anions affected the minocycline decomposition in the order of HCO3−> Cl−> SO42−> NO3−, which was confirmed by the results of electron spin resonance (ESR) spectra. The lowest electrical energy per order (EEO) was 6.5 Wh/L. Over five cycles, there was no change in the photocatalytic performance of the degrading minocycline. Those investigations suggested that effective degradation of minocycline could be reached in the PVDF–PVP–TiO2fiber mats with a low energy consumption, good separation and, good recovery. Three photocatalytic decomposition pathways of minocycline were proposed: (i) hydroxyl substitution of the acylamino group; (ii) hydroxyl substitution of the amide group, and (iii) a cleavage of the methyl groups and further oxidation of the amino group by OH. Potential risks caused by TP159 and TP99 should not be ignored, while the TP90 are nontoxic. Tests indicated that the toxicity of the photocatalytic process may be persistent if minocycline and its products were not mineralized completely.Keywords:electrospinning;minocycline;photocatalytic oxidation;PVDF–PVP–TiO2fiber mats;degradation mechanism
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高影响因子
Materials Advances
·
2021
·Vol. 2
·期 10
·3300-3314
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IF 0
Xing-Xing Ni,Jian-Hua Li,Lu-Ping Yu
A novel and versatile active–passive integrated strategy to integrate both antifouling and antibacterial properties into PVDF membranes was developed. PDA microspheres on modified membranes served as primers, and we proposed that a “PDA guiding effect” existed during the modification process. Specifically speaking, it was a guiding reduction effect from the PDA microspheres toward Ag+ and a guiding generation effect toward L-cysteine that were separately in favor of the generation of AgNPs and cysteine flowers in cross-sections of the membranes. In addition, the active–passive integrated strategy presented in this research simultaneously includes both an anti-adhesion approach for reducing the initial adsorption of organisms and an anti-bacterial approach for suppressing the activities of attached organisms on the membranes. Conventional filtration experiments clearly demonstrated that the zwitterionic characteristics of L-cysteine made it possible to greatly reduce the initial adhesion of foulants and the deposition of dead bacteria on the membranes. Various bacteria-based experiments proved that AgNPs were effective at preventing the growth, proliferation, and colonization of microorganisms, as well as the accompanying membrane biofouling after long-term operation. Furthermore, self-driven filtration experiments, natural organic matter (NOM) solution filtration experiments, and protein adsorption tests were also carried out to evaluate the practical applications of the modified membranes. In this research, the PDA guiding effect was directed toward inorganic AgNPs and organic L-cysteine. This effect has great possibilities to be extended to other functional materials and to be broadly applied in the construction of diverse functionalized surfaces.
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Membranes
·
2021
·Vol. 11
·期 6
·420
·
IF 4.106
Tianshu Liu,Xiaoji Zhou,Yizhuo Sun,Renbi Bai
In this study, PVDF/PTFE composite membranes were prepared by adding a PTFE nanoemulsion to a PVDF solution and casting it through the conventional non-solvent-induced phase separation method. The objective was to explore the effectiveness of using a simple and economical method to modify PVDF membranes with PTFE to enhance their anticorrosion performance, especially under highly acidic or alkaline conditions. PTFE nanoparticles (of around 200 nm in size) in nanoemulsion form were blended with PVDF at a mass ratio of PTFE:PVDF in the range of 0–0.3:1. The obtained membranes were examined to determine the effect of the added PTFE nanoparticles on the structure of the modified PVDF membranes as well as on their mechanical strength and surface characteristics. The membranes were then immersed in various concentrations of acidic or alkaline solutions for varied durations ranging from a few days up to as long as 180 days (6 months). The impacts of by the corrosive solutions on the tensile strength, surface roughness, and water flux of the membranes with different exposure times were quantified. The results showed that although a certain extent of change may occur with extended immersion times, greatly enhanced anticorrosion performance was obtained with the prepared PVDF/PTFE membranes compared with the unmodified PVDF membrane. For example, after being immersed in 5 mol-H+··L−1H2SO4, HCl, and HNO3solutions for 6 months, the tensile strength at breaking point remained at up to 69.70, 74.07, and 71.38%, respectively, of the initial strength for the PVDF/PTFE (M30) membrane. This was in contrast to values of only 55.77, 70.43, and 61.78% for the unmodified PVDF membrane (M0). Although the water flux and surface roughness showed a change trends to the tensile strength, the PVDF/PTFE (M30) membrane had much higher stability than the PVDF (M0) membrane. In a continuous filtration experiment containing H2SO4at 0.01 mol-H+·L−1for 336 h (14 days), the PVDF/PTFE membrane showed a maximum flux change of less than 30%. This was in comparison with a change of up to 50% for the PVDF membrane. However, the PVDF/PTFE membranes did not seem to have a greatly enhanced anticorrosion performance in the alkaline solution environment tested.Keywords:PVDF/PTFE composite membrane;PTFE nanoparticle;polymer blending;non-solvent induced phase separation method;anticorrosive performance
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RSC Advances
·
2021
·Vol. 11
·期 31
·19128-19135
·
IF 3.361
Tong Ye,Hongye Li,Mingyue Du,Xiaowei Ma,Xiaolin Liu,Lixiong Wen
Polymer-based dielectric nanocomposites as raw materials of dielectric capacitors used in advanced electronics and electrical systems have a great application prospect but remain a huge challenge to energy storage performance in high electric fields. In this work, MgAl layered double hydroxide (MgAl LDH) nanosheets loaded with Ni nanoparticles were designed and synthesized, and incorporated into polyvinylidene fluoride (PVDF) to fabricate Ni–MgAl LDH/PVDF nanocomposites with high energy density. The effect of Ni–MgAl LDH nanosheet content (0.2 to 0.8 wt%) on the energy storage performance of MgAl LDH/PVDF nanocomposites was studied. As a result, after adding 0.6 wt% Ni–MgAl LDH nanosheets, the nanocomposites obtained the highest energy density 23.87 J cm−3 (at 640 kV mm−1) and the charge–discharge efficiency reached 65%, which was 76% and 18% higher than that of pure PVDF, respectively. This improvement could be attributed to the multiple functions of Ni–MgAl LDH nanosheets under an applied electric field. On the one hand, Ni nanoparticles on the surface of the MgAl LDH nanosheets could enhance the interfacial conductivity, form plenty of parallel micro-capacitors and produce Coulomb blockade effect, which resulted in high dielectric constant and high breakdown strength. On the other hand, two functions contributed by MgAl LDH nanosheets, homogenizing the electric field and inhibiting the growth of the electric tree coming from its medium dielectric constant and sheet structure, were beneficial to increase the breakdown strength. Furthermore, finite element simulations were employed to explain the mechanism of improved dielectric properties of the Ni–MgAl LDH/PVDF nanocomposites.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Junkai Gao,Miaomiao Cai,Zeguang Nie,Junwei Zhang,Yan Chen
Wettability and roughness modification of membrane surface are crucial for its utilization in the separation of oil/water mixture and emulsion. However, traditional modification method for membrane had the drawbacks of high cost, complex preparation and low flux. In this study, for the first time, based on tannic acid (TA), Cu 2+ and ethylenediaminetetraacetic acid disodium salt (EDTA-2Na), a novel, facile, and cost-effective interface engineering method for significantly enhancing the flux and separation efficiency of polyvinylidene fluoride (PVDF) microfiltration membrane for oil/water mixture and emulsion was developed via in situ extraction of metal ions. TA and Cu 2+ could form TA-Cu 2+ complex which could deposit on the surface of PVDF microfiltration membrane, and then Cu 2+ was extracted by EDTA-2Na, which not only enhanced the surface roughness and wettability of the membrane, but also reserved the porous structure of the matrix membrane. The resulted membrane possessed superhydrophilicity and underwater superoleophobicity, which showed high membrane fluxes of 8841.94 Lm −2 h −1 bar −1 and 1440 Lm −2 h −1 bar −1 for oil/water mixtures and emulsified oil respectively, and the separation efficiency of TA/EDTA-2Na/PVDF could reach 99.99%. Moreover, the membrane still exhibited excellent stability after long soaking treatment in NaCl solution for 48 h. Thus, in this study, a new strategy for membrane surface modification was developed, which had considerable promise for real application of oily wastewater treatment.
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