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.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Wenting Li,Mengdi Chen,Ganwei Zhang,Weicai Chen,Lei Zhang,Shusu Shen,Dapeng Liu,Xiaoji Zhou,Yaoliang Hong
The DCMD technology for wastewater treatment is very promising. However, it is easily suffered by membrane fouling and wetting. In this study, a Janus membrane was fabricated by coating polyvinylamine (PVAM) and gallic acid (GA) onto one side of a PVDF composite membrane, which another side is covered with POTS-SiO 2 . The PVAM and GA side could bind water to form a hydration layer, thus repel the contaminants. The POTS-SiO 2 side was superhydrophobicity and prevented the membrane wetting. Finally, The Janus membrane presented exceptional performance in separating salt containing emulsified oil by DCMD. It kept a stable flux of 17.0 ± 0.2 Kg·m −2 ·h −1 and a low level conductivity of 0.60 ± 0.02 μS/cm in the cold side during the 36 h DCMD procedure, compared with the pristine PVDF membrane and the PVDF/POTS-SiO 2 membrane. The results presented simultaneously antifouling and antiwetting properties of the Janus membrane. While the Janus membrane can be well used in desalination of emulsified oil containing salt, it has a great potential for application to treat other complex wastewater.
研究领域:
环境工程
·
膜科学
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水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Liusha Cen,Fan Yu,Chengcai Li,Guojin Liu,Wangyong Jin,Hailin Zhu,Yuhai Guo
Recently, heterogeneous catalysts prepared by two phase metals were commonly used to activate PMS degradation. However, the synergistic effects of Zn and other metals on the activation of PMS were infrequently studied. In this work, novel PVDF@TA-ZIF-67/8 nanofibers were prepared successfully by first mineralization and then in-situ growth. The prepared PTZ70 exhibited an evidently higher photocatalytic activity than PVDF, PTC, PTZ0, PTZ10 and PTZ100 to degradation OFX (96.5 %). The effects of the mass ratio of Co and Zn, PMS dosage, coexisting ions and organic solvents on the degradation of OFX were concretely investigated. The radical trapping experiment and mechanism analysis showed that the synergistic effect of Co and Zn played a key role in PMS activation, accelerating the generation of 1 O 2 and •O 2 – . Combining the discussion of influencing factors and LC-MS analysis, four OFX degradation pathways were illustrated. In particular, we observed that the degradation OFX of PTZ70 was only slightly reduced by 5.6 % after five cycling, indicating the reusability, good stability and high environmental suitability of PTZ70 performance . This study offers a novel path for the design of catalytic membranes with controllable heterogeneous metal doping.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yuxuan Zhou,Keer Ouyang,Yongqi Da,Lingyan Shen,Zhengwu Dong,Zhuotao Song,Jingjie Wang,Xiaoxue Tan,Xiaohong Jiang,Xuran Xu,A.V. Rogachev,D.G. Piliptsou,A.A. Rogachev,M.A. Yarmolenko,Jianbing Xu,Yinghua Ye,Ruiqi Shen
Energetic interfacial films represent a promising encapsulation material for micro- thruster arrays in near-Earth orbit, where their combustion performance under low- pressure or vacuum conditions is critical for practical application. Herein, a uniformly dispersed layered energetic composite film suitable for scalable array encapsulation has been designed via electrospinning technology. The ternary composite energetic film consists of interwoven polyvinylidene fluoride/aluminum/copper oxide (PVDF/Al/CuO) nanofibers. Morphological analysis confirms the effective loading of nanoparticles (Al and CuO) onto the fibers. Energetic films fabricated by this method significantly suppress particle agglomeration. Thermal analysis reveals atmosphere-dependent exothermic pathways. Constant-volume combustion experiments demonstrate that energy release is modulated by film thickness. The evolution of the film ablation flow field has been investigated. Crucially, transient resistance thermometry has for the first time reported the phenomenon of increasing ignition temperature of energetic materials with decreasing pressure under low-pressure conditions. At 1 kPa, the ignition temperature is significantly elevated compared to that at atmospheric pressure. Propagation velocity characterization uncovered a counterintuitive phenomenon: below 10 kPa, 610 μm-thick films exhibit a 42% lower propagation velocity than 270 μm-thick films, a phenomenon termed the thickness-compensation failure effect. An asymmetric heat transfer-dissipation theory is proposed to explain this inversion through geometric thermal management. This work provides crucial experimental evidence and a theoretical foundation for guiding the design of energetic films for vacuum-operating micro-thruster array encapsulation.
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 6
·期 2
·440-448
·
IF 6.367
Xin Liang,Lulu Wang,Yang Wang,Yongchao Liu,Yi Sun,Hongfa Xiang
The functional design of separators has been proved to be one of the most efficient methods to improve the electrochemical performance of lithium–sulfur batteries. In this work, a multifunctional separator with gradual changes to four aspects was constructed by integrating a PVDF-HFP/h-BN membrane with a Co-doped carbon nanofiber. The architecture has four gradations, which offers multifold advantages. First, in terms of density, there is a transition from loose to dense, which results in a higher electrolyte uptake rate, reduces the amount of free electrolyte and further suppresses the shuttle effect. Additionally, in terms of composition, a transition from inorganic to organic is designed, which allows the inorganic and organic components to bind closely and reduces the interfacial resistance. Meanwhile, there is a transition from high electronic conductivity to insulation. The change in electronic conductivity leads to effective conversion of the polysulfide. Finally, in terms of ionic conductivity, there is a transition from low to high, which gives the separator better ability to conduct lithium ions. As a consequence, a battery with the as-constructed multifunctional separator performs with good capacity stability, which demonstrates a new concept for high-performance lithium–sulfur battery design.
研究领域:
材料科学
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储能技术
·
电池技术
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DOI
高影响因子
FUEL
·
2019
·
IF 5.128
Chen Li,Yuefei Song,Xudong Wang,Quan Zhang
Sulfonated titanium dioxide (S-TiO 2 ) was prepared by the grafting of sulfonic groups onto TiO 2 , and doped into the PVDF-g-PSSA as a highly efficient inorganic additive, thus achieving simultaneous improvement of the proton conductivity and anti-fouling property of the synthesized S-TiO 2 /PPSSA proton exchange membrane (PEM). The S-TiO 2 /PPSSA membrane was implemented in microbial fuel cell (MFC) for the first time, and its physicochemical properties and performance in MFC were studied. A new technique of combining Quartz crystal microbalance with dissipation with membrane spin-coated sensors made by a spin coating method was utilized to provide an insight into the anti-fouling property of the prepared membranes. The implementation of Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy demonstrated TiO 2 was successfully introduced into the sulphonic groups. The S-TiO 2 /PPSSA-5.0 membrane has a significant increase in the water uptake (40.9%) and proton conductivity (0.067 S/cm) compared with the PVDF-g-PSSA membrane. QCM-D results indicated that it has better anti-fouling property than pristine membrane and Nafion 117. Moreover, the MFC with the S-TiO 2 /PPSSA-5.0 membrane exhibited a maximum power density of 130.54 mW/m 2 , very close to that of Nafion 117 (132.02 mW/m 2 ), but had the highest COD removal of 91% and least bio-fouling adsorption. These results demonstrate that the blending of sulfonated organic polymers and sulfonated inorganic additives can improve the electrochemical and anti-fouling properties of the composite membranes, which is a new concept for the preparation of PEM suitable for MFC. The S-TiO 2 /PPSSA-5.0 composite PEM is an appropriate candidate separator for the large-scale application of MFCs.
研究领域:
材料科学
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电化学
·
环境工程
·
生物技术
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Xin Zhong,Qinhan Shi,Zhiguang Guo
Solving the problem of oil and water pollution is an important topic in environmental protection. The separation of oil-water emulsion with high efficiency and low consumption has been the direction of social efforts. Membrane separation technology combined with surface wettability and pore size screening is considered to be one of the most promising ways to separate oil-water emulsions. In this paper, the polyvinylidene difluoride (PVDF) membrane is prepared by combining the two methods of blending and coating modification as a double barrier. The prepared PVDF membrane can completely wet water, achieve superhydrophilic in air, and superoleophobic underwater. The separation efficiency and flux are 99.57% and 678 L h −1 m −2 bar −1 , respectively, for toluene emulsions containing surfactants with an average particle size of 1.7 µm. At the same time, it can also effectively separate different kinds of light/heavy oils. After three cycles of testing still maintain high efficiency of separation. The results show that the prepared PVDF membrane can effectively separate the emulsion containing surfactant with smaller particle size distribution of oil droplets. This method provides a new strategy for the separation of oil-water emulsions and has broad application prospects.
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
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 29
·e02906
·
IF 2
Haojun Zhang,Gengrui Zhao,Shaoting Ma,Bin Zhang
Graphical A novel method enhances triboelectric nanogenerator (TENG) output by using La-doped bismuth ferrite nanoparticles as the triboelectric layer filler. Under the filler concentration threshold, the output performance of the TENG with 1.5 wt% La-doped BFO fillers is significantly enhanced compared to that with undoped BFO fillers. Additionally, a self-powered anticorrosion system is developed using this TENG as the energy source. Incorporating high-permittivity nanoparticles as fillers into triboelectric layers is an effective strategy to enhance the output performance of triboelectric nanogenerators (TENG). However, exceeding the critical filler concentration threshold causes nanoparticle aggregation, limiting further output performance enhancement of TENG. Here, a novel approach is proposed to enhance TENG output performance by doping lanthanum (La) into bismuth ferrite (BFO), forming La-doped BFO nanoparticle fillers (BLFO) to further improve the output performance of polyvinylidene fluoride (PVDF)-based TENG without increasing filler concentration. This approach overcomes the limitation of nanoparticle aggregation at high filler loadings while significantly enhancing the output performance of TENG. Below the critical concentration threshold, the dielectric constant of BLFO/PVDF composites increases by 32% compared to undoped BFO/PVDF composites. Consequently, the BLFO/PVDF-based TENG achieves a high output voltage of 329 V and short circuit current of 44 µA, representing 43% and 69% increases over the BFO/PVDF-based TENG, respectively. Notably, these values represent 219% and 193% increases compared to the pure PVDF-based TENG. Furthermore, a self-powered anticorrosion system powered by the BLFO/PVDF TENG demonstrates effective metal protection, as evidenced by open-circuit potential measurements and reduced average corrosion rates.
研究领域:
能量收集
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材料科学
·
纳米技术
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电化学
·
防腐保护
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Jian-Hua Li,Xing-Xing Ni,De-Bin Zhang,Hui Zheng,Jia-Bin Wang,Qi-Qing Zhang
A facile and versatile approach for the preparation of super-hydrophilic, excellent antifouling and hemocompatibility membranes had been developed through the generation in situ of bio-inspired polydopamine (PDA) microspheres on PVDF membranes. SEM images showed that the PDA microspheres were uniformly dispersed on the upper surface and the lower surface of the modified membranes. And there were a great number of PDA microspheres immobilized on the cross-section, but the interconnected pores structure was not destroyed. These facts indicated the existence of membrane micro-reactor effect for the whole membrane structure. Considering the remarkable improvement of hydrophilicity, antifouling properties, and permeation fluxes, we also proposed the cluster phenolic hydroxyl effect for the PVDF/PDA hybrid membranes. And the cluster phenolic hydroxyl effect can be ascribed to the all directions distributed phenolic hydroxyl groups on the whole membrane structure. Besides, the self-driven filtration experiments showed the great wetting ability and permeability of the PVDF/PDA hybrid membranes in filtration process without any external pressure. This implied the existence of accelerating self-driven force after the water flow flowed into the internal of membranes, which contributed to the increase of water flow velocity. All the three aspects were in favor of the enhancement of hydrophilicity, antifouling properties and permeability of the modified membranes. Moreover, the conventional filtration tests, oil/water emulsion filtration tests and protein adsorption tests were also carried out to discuss the practical applications of PVDF/PDA hybrid membranes. And the hemocompatibility of the modified membranes was also proved to enhance greatly through the hemolysis tests and platelet adhesion tests, indicating that the membranes were greatly promising in biomedical applications. The strategy of material modification reported here is substrate-independent and can be extended to other substrate materials, and allows the development of novel functional membranes through secondary treatments.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Weiwei He,Dan Xu,Hailin Zhu
Nowadays, the discharge of wastewater causes serious environmental pollution, affecting the living environment and the health of human beings. So the problem of wastewater treatment is imminent. In this context, the PVDF/SMA/CdS membranes had oil-water separation and dye degradation effects were prepared by using non-solvent phase transition and in-situ deposition methods. Its separation efficiency reached more than 98%, and the oil-water removal rate was at more than 90% after 5 times of recycling. Under visible light irradiation, it could completely degrade methylene blue solution (MB, 10 mg·L -1 , pH=3) within 20 min, cochineal solution (Ponceau 4R) within 12 min, and chromium blue-black R (EBR) solution within 6 min, and the degradation rate was at more than 95% after 5 cycles. Therefore, the PVDF/SMA/CdS membrane can effectively treat wastewater. This study opens up a promising avenue for wastewater treatment technology with high potential for application.
研究领域:
环境科学
·
材料科学
·
水处理技术
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ting Sun,Chuanyezi Cai,Jiacheng Guo,Gengqi Tong,Yu He,Xi Chen,Lu Ye,Jianjun Zhang,Sude Ma
As dielectric film as the core device of capacitors, how to enhance its dielectric and energy storage performance is crucial for the application of film capacitors. To this end, we propose a solvothermal synthesis of metal-organic framework (MOF) material UiO-66-NH 2 to explore the potential application of MOF materials in the field of dielectric energy storage. BaTiO 3 nanoparticles and MOF fillers were selected to be introduced into the PVDF/PI matrix, and nanocomposite films were prepared by the spin-coating process, which showed a strong bonding at the micro-interface of the film and a uniform macroscopic thickness without obvious aggregation. The high porosity of UiO-66-NH 2 and the high dielectric constant of BaTiO 3 , as well as the high breakdown strength E b of the polymer matrix are utilised to synergistically promote the energy density and maintain good charge/discharge stability. Notably, the BU-X/PVDF/PI nanocomposite films demonstrated good energy storage performance and stable charge/discharge efficiency η. The results show that the BU-0.5/PVDF/PI nanocomposite film has an E b of 2190 kV/cm, an energy storage density of 3.73 J/cm 3 , and stable η ranging from 60 % to 94 %, which are superior to the pure BaTiO 3 /PVDF/PI nanocomposite film in terms of overall performance. In addition, the dielectric loss of the BU-0.5/PVDF/PI nanocomposite film is as low as 0.022. These findings indicate the good prospects for the development of MOF materials in the field of energy storage.
研究领域:
材料科学
·
介电材料
·
能源存储
·
高分子纳米复合材料
·
功能材料
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Hui Wang,Haijiao Lin,Shuhong Huang,Ling Li,Youwei Zhao,Wenming Zhang
In spite of the high level of attention paid to multifunctional sensors, the flexible and multifunctionality are still intractable challenges to be tackled. Herein, we design a flexible, hydrophobic and stable multifunctional sensing material by electrostatic spinning of PVDF/ZnWO 4 @PDA (PZP). The incorporation of ZnWO 4 @PDA into PVDF nanofibers can act as an effective nucleating agent and photosensitizer, which increases the polar crystalline phase and photovoltaic properties of PVDF. With the synergy of PVDF and ZnWO 4 @PDA, PZP based piezoelectric sensors offer significantly superior electrical output (28.4 V, 600 nA) and high sensitivity (1.04 V/kPa). Moreover, it is particularly surprising that photoelectric sensor based on PZP textiles has excellent optical properties, as confirmed by the response / recovery time (0.6 s / 0.66 s) of simulated sunlight detection. Piezoelectric photoelectric effect exists in PZP textiles, as evidenced by the significant increase in the strain output current of photoelectric sensor when irradiated with sunlight. Furthermore, based on the coupling of piezoelectric effect and triboelectric effect of PZP composite, the contact out nano-triboelectric generator has enhanced the electrical output and electromechanical conversion efficiency. Therefore, this work has successfully prepared multifunctional sensing materials that integrate pressure sensing, audio recognition, underwater communication, optoelectronic detection and triboelectric energy collection, paving a new way for the flexible multifunctional sensors.
研究领域:
材料科学
·
传感器技术
·
能源转换与存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）