APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Siyuan Jin,Zhou Jie,Ruizhi Wu,Xiaochun Ma,Zhe Yu,Wang Guixiang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Neshchimenko Vitalii,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
An in-situ grown LDH/ZIF-8 hybrid film on the surface of MAO film based on the LA93 alloy was successfully fabricated by the one-step method. The composite film, called as MLZ, demonstrates exceptional corrosion resistance. The corrosion current density is reduced by two orders of magnitude compared to the MAO film. Furthermore, it possesses significant long-term protective capabilities. Experimental measurement and density functional theory (DFT) calculations were conducted to investigate the formation mechanism of MLZ composite film. During the hydrothermal, Zn ions from the in-situ generated LDH on the MAO surface serves as active nucleation sites, facilitating the nucleation and growth of ZIF-8 crystals. The formation of ZIF-8 effectively compensates for the intergranular defects in LDH, enhancing the integrity of the film. LDH/ZIF-8 film effectively seals defects in the MAO film and constructs a robust physical barrier, significantly enhancing the protective capacity of the film.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 16
·7384-7393
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IF 2.7
Wanyu Lu,Qijin Tang,Huajing Cheng,Shudi Li,Cailong Zhou,Hao Yang
The potential of bionic-inspired superhydrophobic membranes in the field of oil–water separation is significant. In this study, tannic acid induced the rhombohedral crystal form of ZIF-8 to grow in situ on a nylon membrane, resulting in the formation of a layered micro-nano structure. As a result, we successfully prepared a multifunctional composite membrane with exceptional underwater superoleophobicity and oil anti-adhesion. The composite membrane demonstrated an impressive separation flux for layered oil–water mixtures, reaching up to 4851.2 L m−2 h−1. Furthermore, when dealing with surfactant-free oil-in-water emulsions, the separation efficiency exceeded 99.0%. Because ZIF-8 is positively charged, the composite membrane exhibits different separation fluxes in the presence of different surfactants. For SDS stabilized toluene emulsion in water, the maximum separation flux of the composite membrane is 1307.4 L m−2 h−1. The membrane also has good tolerance to alkali and salt substances and is easy to recycle and reuse. Consequently, the ZIF-8 composite membrane has significant potential in effectively separating oil–water emulsions.
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 SOLID STATE CHEMISTRY
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2022
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IF 3.656
Chenyang Qi,Jiang Li,Yayun Shi,Bowen Zhang,Tongdan Chen,Chen Wang,Qihang Liu,Xiaowei Yang
Ion sieving is essential for biological systems and membrane-based applications. At present, metal-organic framework (MOF) membranes are of great interest for use in ion separation, but it remains a great challenge to design high quality MOF membranes with a simple preparation process and desirable ion selectivity. Herein we fabricate a MOF composite membrane , containing highly penetrated ZIF-8 channels. The ZIF-8 channels are the dominant pathways for ion transport and display a good Li + /Mg 2+ sieving performance (Li + /Mg 2+ = 6.1). The simulation reveals that the Li + /Mg 2+ selectivity is associated with the significant disparity of transport energy barrier between them, which is caused by the different extent of ion dehydration in angstrom-scale ZIF-8 channels. This work provides an effective strategy to develop ionic sieving membranes based on penetrating MOF channels for lithium extraction.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Jiali Tang,Viatcheslav Freger,Lu Shao,Xuezhong He
Metal-organic frameworks (MOFs)-based hybrid composite membranes are promising candidates for achieving highly efficient water purification. In this study, a facile, novel pressure-induced filtration method involving in-situ polymerization of butyl methacrylate (BMA) was proposed for sealing ZIF-8 nanoparticles on top of polyethersulfone (PES) ultrafiltration membrane support. The developed (ZIF-8+polyBMA)/PES composite membranes with thin toplayers of <1 μm present attractive water permeance (up to 31 LMH/bar) and good rejection of Congo red (99.2 %) and Methylene blue (99.1 %). The ZIF-8 particles served as direct-through channels with superior separation performance due to their high porosity and tunable pore structure, while the interstices were successfully sealed with polyBMA by in-situ polymerization, as demonstrated by SEM and dye removal experiments. It was found that the morphology of ZIF-8 transformed from a rhombic dodecahedron to two-dimensional hexagonal nanosheets during the fabrication process. We hypothesize that this surprising phenomenon is caused by the reaction of the initiators (Na 2 S 2 O 5 and K 2 S 2 O 8 ) that generate the hydroxyl and sulfate radicals attacking and transforming the Zn-MIM bond network of ZIF-8. However, insights into the structural changes need to be further investigated to understand the mechanism involved.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Wei-Min Liu,Xin-Ru Chen,Heng Mao,Shen-Hui Li,Yan-Mei Zhang,Li-Hao Xu,Zhi-Ping Zhao
Construction of ultra-thin and defect-free separation membrane on inner surface of hollow fiber supports is significant but challenging for molecular separation. In this study, the highly permeable PDMS@ZIF-8/PVDF composite membranes were successfully fabricated upon the inner-surface of polyvinylidene fluoride (PVDF) hollow fiber membrane for pervaporation (PV) ethanol/water separation. The efficient preparation of hierarchical PDMS@ZIF-8/PVDF composite membranes benefited from the precise regulation of ZIF-8 layer through interfacial synthesis and sequential coating of PDMS matrix. The thickness of the PDMS layer was only 16 ± 2 nm, which admirably eliminated the non-selective defects in ZIF-8 layer. Owning to the optimal combination of MOF layer and ultra-thin polymer layer, the as-prepared membrane exhibited the excellent ethanol flux of 1.34 kg m −2 h −1 with an ethanol concentration in permeate of 31.3 wt% for separating 5 wt% ethanol aqueous solution at 40 °C. The separation performance of the resultant membrane was superior to that of the other ethanol selective PV membranes . These findings herein provided a new way for preparing high-performance hollow fiber composite membranes for PV separation.
研究领域:
材料科学
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分离技术
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产品关联
DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 28
·e00259
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IF 2
Bo Yang,Hai Xing,Yang Xia,Xin Wang,Ningning Liu
Graphical ZIF-8 was synthesized through an in-situ growth method within a PVDF membrane matrix. The PVDF/ZIF-8 composite membrane was subsequently prepared via the phase inversion method using immersion precipitation. The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The widespread use of organic dyes in industrial processes has led to increasing environmental pollution due to the discharge of dye-contaminated wastewater, necessitating more efficient dye removal methods. In this study, a poly(vinylidene fluoride) (PVDF)/ZIF-8 composite membrane was fabricated via a phase inversion method using immersion precipitation, with ZIF-8 synthesized via in-situ growth within the membrane matrix. The composite membranes were thoroughly characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and thermogravimetric analysis (TGA). The ZIF-8 particles were uniformly distributed in the PVDF/ZIF-8 composite membrane. The adsorption performance of the PVDF/ZIF-8 composite membrane was evaluated for methyl green (MG) removal. At 313 K with an adsorbent dose of 10 mg, the membrane exhibited an adsorption capacity of 172.30 mg g⁻¹ and a removal ratio of 87.21%, demonstrating that the incorporation of ZIF-8 significantly enhanced adsorption performance. Adsorption isotherm studies revealed that the process followed the Freundlich model, while kinetic analysis indicated a pseudo-second-order mechanism. Additionally, thermodynamic investigations suggested that the adsorption was endothermic and spontaneous. The major driving force for adsorption was identified as electrostatic interactions between the dye and the membrane. These findings highlight the potential of PVDF/ZIF-8 composite membranes for effective dye removal from wastewater.
研究领域:
环境科学
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材料工程
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化学工程
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纳米技术
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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
Xiaoya Xu,Chengli Jiao,Xinxin Li,Xiaoqian Zhang,Lun Shu,Ge Su,Minghua Huang,Heqing Jiang
Metal-organic framework (MOF) membranes have emerged as promising candidates for hydrogen separation, but the fabrication of defect-free and flexible MOF membranes is still challenging. Here, we propose a thermally induced in-situ growth strategy to develop flexible membranes consisting of amorphous Zn-2-methylimidazole complex (a-Zn-MeIM) and crystalline zeolitic imidazolate framework-8 (c-ZIF-8) on polysulfone substrate, denoted as amorphous Zn-MeIM/crystalline ZIF-8 (a-Zn-MeIM/c-ZIF-8) membranes. During the thermal treatment of pre-sprayed mixture containing a-Zn-MeIM on the top surface of polysulfone substrate, a-Zn-MeIM is converted to c-ZIF-8. Similar coordination environments featured with Zn 2+ -2-methylimidazolate coordination configurations between flexible a-Zn-MeIM and rigid c-ZIF-8 provides enhanced interfacial compatibility, effectively eliminating cracks and grain boundary defects. Benefitting from both the flexibility of amorphous phase and well-defined pore structure of crystalline phase, the resulting a-Zn-MeIM/c-ZIF-8 membranes show flexibility and preferential diffusion of H 2 molecules. The membrane structure can be modulated by adjusting c-ZIF-8 concentration of sprayed colloid and thermal treatment temperature. The optimized a-Zn-MeIM/c-ZIF-8 3.75 membrane with flexibility exhibits a H 2 /CH 4 mixed separation selectivity up to 96.9 at 90°C. Additionally, a-Zn-MeIM/c-ZIF-8 3.75 membrane with an area of 644 cm 2 has been prepared, promoting the practical applications of MOF membranes with good processability.
研究领域:
材料科学
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化学工程
·
膜技术
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DOI
高影响因子
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