ANALYST
·
2023
·
IF 4.2
Jing Liu,Bing Yin,Xiaobo Liu,Cheng Yang,Shiyu Zang,Shuo Wu
The zeolitic imidazole framework with leaf-shaped morphology (ZIF-L) has a wide range of promising applications in gas storage, battery materials, catalytic reactions, and optoelectronic devices due to its planar leaf-like structure and large surface area. However, the low conductivity, weak catalytic activity, and poor stability in the water dielectric of ZIF-L limited its further practical application. To solve the problems, we added the conductive polymer heterocyclic poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) in ZIF-L for the sensitive detection of dopamine (DA). The synthesized composite ZIF-L/PEDOT: PSS (ZIF-L/PEDOT) not only retained the surface morphology of ZIF-L but also exhibited excellent electrochemical properties. The higher electrical conductivity of ZIF-L/PEDOT compared to ZIF-L was due to the enhanced electron transfer at the interface between ZIF-L and PEDOT: PSS. As a result, we developed an electrochemical biosensor based on the ZIF-L/PEDOT composite, which had a limit of detection of 7 nM for DA and a wide linear range from 25 nM to 500 μM. Furthermore, the current dropped was negligible after 28 days, proving the biosensor had excellent stability. Based on the above outstanding performance, the ZIF-L/PEDOT-based biosensor was successfully used to detect DA in human serum samples. These results demonstrated that ZIF-L/PEDOT was expected to play an essential role in disease detection.
研究领域:
材料科学
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电化学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Junzhou Men,Yi Zheng,Chen Luo,Hui Xian,Yuxia Zhang,Yating Wang,Tao Jiang
Defect engineering is crucial for optimizing the band structures and charge separation of photocatalysts. Herein, the quantity and distribution (core/shell) of organic ligand defects in leaf-shaped zeolite imidazole framework (ZIF-L) composites were modulated via a multi-step method. VZ-12@ZIF-L (with 12 % 1-vinylimidazole in the core) exhibited the highest carrier separation efficiency and the strongest driving force for the hydrogen evolution reaction (HER), achieving a hydrogen evolution rate of 443.19 μmol·h⁻¹ ·g⁻¹ . This rate is 1.81 times that of VZ-25@ZIF-L (with a high defect quantity) and 1.40 times that of ZIF-L@VZ-12 (with defects in the shell). Mechanistically, core defects facilitated the transport of photogenerated carriers, while shell defects narrowed the band gap. Notably, the impact of carrier transport capacity on photocatalytic activity was more significant than that of light absorption. This study provides new insights for the design of efficient defect-engineered metal-organic frameworks (MOFs).
研究领域:
材料科学
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光催化
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金属有机框架
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能源化学
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纳米材料
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半导体物理
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表面科学
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 12
·1340
·
IF 2.935
Fang Zhang,Jing Dou,Hui Zhang
Two-dimensional metal–organic framework (MOF) nanosheets with molecular sieving properties and unique dimensional advantages are highly desired as polymer fillers for gas separation applications. Regarding polymer-supported MOF membranes, it is crucial to enhance the adhesion between the polymeric substrate and the MOF component and avoid MOF particle agglomeration. In this study, hydrophobic, embedded nanoporous nanosheets of a 2D zeolitic imidazolate framework synthesized using zinc salt and 2-methylimidazole (Hmim) aqueous solution (ZIF-L) were incorporated into a carboxymethyl cellulose (CMC) solution to form a steady mixed aqueous suspension through one-step solution blending. This prepared the composite membranes with a fine dispersion of ZIF-L nanosheets (up to loadings of 52.88 vol %) and good adhesion within the highly dense structural CMC matrix due to the strong interactions between ZIF-L and CMC, as confirmed by FTIR, Zeta potential, XPS, and SEM analysis. The potential advantages of CMC over classic polymer matrices used for gas separation mainly include: (a) Good interaction, (b) high dispersion of ZIF-L nanosheets, (c) the gas barrier nature of the CMC membrane, and (d) a facile water-based synthetic process. Based on the molecular sieving effect of ZIF-L and the gas barrier nature of the CMC matrix, gas permeation tests (H2, CO2, N2, CH4) of the mixed membrane showed a great improvement in gas selectivities compared with the CMC membrane and the reported pure ZIF membranes.Keywords:carboxymethyl cellulose;metal–organic framework nanosheets;interactions;gas permeability;gas selectivity
研究领域:
材料科学
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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
PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2021
·Vol. 38
·期 5
·1032-1042
·
IF 3.309
Xu Li,Qin Yu,Liu Liying,Xiao Juntian,Ding Zhongwei
The membrane contactor has been considered an effective device to capture CO 2 , but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO 2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8°. And after a ten-day immersion test in CO 2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO 2 permeability of the composite membrane was 61.8×10 −8 ·mol·m −2 ·s −1 ·Pa −1 with an ideal CO 2 /N 2 separation factor of ∺20, which was effectively improved in comparison with the control membrane. In the CO 2 absorption experiment, the prepared membrane achieved the competitive CO 2 flux of 3.02×10 −3 ·mol·m −2 ·s −1 when the liquid velocity was 0.25 m·s −1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.
研究领域:
材料科学
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环境工程
·
化学工程
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yue Lai,Wei Xia,Jingjing Li,Junjie Pan,Cheng Jiang,Zexing Cai,Chao Wu,Xianli Huang,Tao Wang,Jianping He
Two-dimensional carbon/CoP hybrids catalysts usually exhibit extraordinary performance especially in hydrogen evolution reaction (HER) application because of their unique morphology which bring unique physical and chemical properties. Although Co-doped zeolitic imidazolate framework nanoleaf (Co-ZIF-L) is quite attractive as carbon-based catalyst precursor, carbonization and phosphorization processes would normally induce Co-ZIF-L derived CoP/N-doped carbon (CoP-NC) catalyst to occur structural collapse due to the shrinkage stress and strong reducibility of PH 3 , seriously restricting the structural advantage of these catalysts. To this end, a carbon-shell confinement strategy by polydopamine (PDA) is developed to improve the structural stability of these catalysts. The precursor that Co-ZIF-L coated with PDA (Co-ZIF-L@PDA) has a more stable structure, which makes the electrocatalyst CoP-NC possess componential advantage and the merits of two-dimensional structure. The resultant CoP-NC exhibits enhanced activity and good stability for pH-universal HER. The overpotentials of CoP-NC at the current density of 10 mA cm −2 are 145 mV in 0.5 M H 2 SO 4 solution and 167 mV in 1 M KOH solution. Additionally, the electrocatalyst CoP-NC displays comparable activity and stability for HER in neutral media as well.
研究领域:
材料科学
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电化学
·
催化
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DOI
高影响因子
DESALINATION
·
2026
·
IF 9.8
Mengyao Chen,Yangxiang Huang,Yeqiang Lu,Congjie Gao,Lixin Xue
Polyamide/polyethylene (PA/PE) nanofiltration (NF) membranes based on polyethyleneimine (PEI) had demonstrated excellent Li + /Mg 2+ selectivity, but showing trade-off between their permeance and Li + /Mg 2+ selectivity. In this work, a novel cross-substrate counter diffusion (CSCD) method was introduced to grow and secure ZIF-L particles in the PA layers. Specifically, rather than directly contacting the PA layers containing Zn(II) cation (PA/Zn) with an aqueous solution of 2-methylimidazole (2-MIM) ligand from the top sides, 2-MIM ligand molecules were diffused across the PE substrate from the bottom sides to react with Zn(II) secured on the top sides of PA layers. Compared with the top-down method, the bottom-up approach had yield PA/ZIF-B NF membranes with higher surface roughness, larger average pore size and narrower pore size distribution. Notably, the pure water permeance of PA/ZIF-B membrane was increased by 2.6-folds to 15.1 L·m −2 ·h −1 ·bar −1 at a high Li + /Mg 2+ separation factor (S Li/Mg ) of 16.5, breaking the trade-off performance upper bound between water permeance and Li + /Mg 2+ separating selectivity and outperforming most of the reported TFN NF membranes.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jingqiu Li,Yuming Xie,Mengjue Cao,Yi Feng,Jianfeng Yao
The metal ion etching induced transformation of zeolitic imidazolate frameworks (ZIFs) to layered double hydroxides (LDHs) is closely related to the etching conditions. Here, by tuning the Ni 2+ etching conditions (e.g., initial Ni 2+ concentration and etching time), Co-ZIF-L templated CoNi-LDH with diverse morphologies and tailorable compositions are obtained and their resultant electrochemical properties are optimized. Mechanism study reveals that the etching conditions significantly affect the disassembling rate of Co-ZIF-L as well as the formation rate of CoNi-LDH, leading to the morphological and compositional variance of etched samples, which further results in their distinct electrochemical activities. The resultant asymmetric supercapacitor assembled with Co-ZIF-L derived CoNi-LDH and activated carbon can achieve a maximum energy density of 77.3 Wh/kg at a power density of 700 W/kg with the capacity retention of 85.7 % after 2000 cycles, superior or comparable to other advanced CoNi-LDH based supercapacitors .
研究领域:
材料科学
·
电化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shiyang Li,Longdou Tu,Yeqiang Lu,Mingjie Lin,Junmei Ma,Chaojie Bai,Congjie Gao,Lixin Xue
A novel strategy was developed to build high-performance thin film composite (TFC) total heat exchange membranes (THEMs) by in situ growing ZIF-8 crystalline micro-leaves (ZIF-L) from Polyethyleneimine (PEI) coated on polysulfone (PSF) ultra-filtration substrates. It was found that flexible PEI polymeric chains could tightly cross-link and seal large masses of ZIF-L micro-leaves (ZIF/PEI wt. ratio up to 18.5) to thwart CO 2 permeation, on top of PSF substrate. Such PEI cross-linking could also effectively open up the internal channels of ZIF-L micro-leaves to enhance moisture permeance and latent heat recovery without trading off CO 2 gas barring property. ZIF-L in varied shapes protruded into the air stream could provide ultra-rough surfaces with increased surface area for improved total energy recovery efficiency. Optimized PEI/ZIF-L TFC THEMs showed ultra-low CO 2 permeance of 0.5–8 GPU and ultra-high total heat recovery rates of 68–74%.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yong Liu,Chao Wu,Zhongming Zhou,Wei Liu,Hongyu Guo,Baoquan Zhang
The development of high-performance mixed matrix membranes (MMMs) with satisfactory structure stability has attracted much attention for the past few years. The rational design and synthesis of fillers to well coordinate themselves in the polymeric matrix is still challenging. The core-shell structured fillers were synthesized via the heteroepitaxial growth of ZIF-8 on ZIF-L(Co) surface (ZIF-L(Co)@ZIF-8), which were then embedded into Pebax to fabricate MMMs for enhanced CO 2 /CH 4 separation. The synthesized fillers and MMMs were characterized via SEM with EDS mapping, TEM, XRD , FIIR and nanoindentation measurements. The effects of ZIF-L(Co)@ZIF-8 loading and filler components on gas separation performance were studied with the evaluation of membrane stability. The experimental results indicated that the filled ZIF-L(Co)@ZIF-8 could be evenly distributed within the bulky Pebax. The synergistic effect of the core-shell structured fillers in adsorption and molecular sieving endowed the synthesized MMMs with superior gas separation performances. The optimal separation performance is achieved for the MMM containing 3 wt% of ZIF-L(Co)@ZIF-8 with a CO 2 permeability of 145.7 Barrer and a CO 2 /CH 4 selectivity of 40.9, corresponding to 79.1% and 110.1% increases over pure Pebax membrane.
研究领域:
材料科学
·
膜技术
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气体分离
·
聚合物纳米复合材料
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金属有机框架材料（MOFs）
✓ 已验证
DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 5
·279
·
IF 4.432
Hang Yang,Xianyu Lan,Yuzhu Xiong
Although many advances have been made in medicine, traumatic bleeding and wound infection are two of the most serious threats to human health. To achieve rapid hemostasis and prevent infection by pathogenic microbes, the development of new hemostatic and antibacterial materials has recently gained significant attention. In this paper, safe, non-toxic, and biocompatible polyvinyl alcohol (PVA); carboxymethyl cellulose (CMC), which contains several carboxyl and hydroxyl groups; and polyethylene glycol (PEG), which functions as a pore-forming agent, were used to prepare a novel PVA/CMC/PEG-based composite hydrogel with a macroporous structure by the freeze-thaw method and the phase separation technique. In addition, a PVA/CMC/PEG@ZIF-L composite hydrogel was prepared by the in situ growth of zeolitic imidazolate framework-L (ZIF-L). ZIF-L grown in situ on hydrogels released Zn2+and imidazolyl groups. They elicited a synergistic antibacterial effect in hemostasis with PVA and CMC, rendering the PVA/CMC/PEG@ZIF-L hydrogel with a good antibacterial effect againstStaphylococcus aureus. At the same time, the macroporous structure enabled the rapid release of Zn2+and imidazolyl groups in ZIF-L and promoted cell proliferation at an early stage, enhancing the coagulation efficiency. A rat liver injury model was used to confirm its rapid hemostasis capacity.Keywords:in situ growth;macroporous structure;synergistic antibacterial;rapid hemostatic;carboxymethyl cellulose;wound dressing;hydrogel;ZIF-L;polyvinyl alcohol;phase separation technique
研究领域:
生物医学工程
·
材料科学
·
创伤修复
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Haojie Sun,Bo Yu,Xue Pan,Zhicheng Liu
Metal-organic frameworks (MOFs) such as zeolitic imidazolate framework (ZIF) have shown potential in removing various contaminants from water. However, the MOF materials, usually in powder form, suffer from easy aggregation and poor recyclability, limiting their practical applications in water treatments. Here, we have designed leaf-like MOF-decorated electrospun nanofiber membrane as adsorbent to address the problems. More specifically, two dimensional ZIF-L materials were decorated on electrospun polyacrylonitrile nanofibers (NF) using an in-situ growth method. The obtained ZIF-L/NF nanocomposite can efficiently adsorb toxic malachite green and reach a high adsorption capacity of 5103 mg g −1 , attributed to the π-π stacking interactions between the ZIF-L and the dyes. The adsorption process conforms to pseudo-second-order kinetics and Langmuir isotherm model. From thermodynamic analysis, it was found that the adsorption was spontaneous and endothermic. Moreover, the ZIF-L/NF nanocomposite also exhibits excellent recyclability in the adsorption–desorption test.
研究领域:
环境科学
·
材料科学
·
水处理
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chenhan Xiong,Wei Cao,Jiaqi Chen,Yanqiu Yu,Xinming Lian,Rui Xue,Nan Chen,Zhaoyang Fan,Guoping Du
Designing rational heterostructures of high-performance electroactive materials on conductive substrates with hierarchical structures is critical for advancing electrochemical energy storage technologies. In this study, a unique spatial structure is fabricated by vertically aligning two-dimensional (2D) structures of Co-ZIF-L on conductive nickel foam (NF) substrate through interruption of ZIF-67 formation. This is followed by an innovative electrochemical synthesis method that disrupts unstable surface coordination bonds in Co-ZIF-L, enabling the in-situ generation of Co(OH) 2 . The resulting Co(OH) 2 @ZIF-L/NF binder-free electrodes feature a hierarchical spatial structure and are synthesized in approximately 30 s. These electrodes showcase exceptional area capacity of 3.1 C cm −2 at 1 mA cm −2 , attributed to their high specific surface area and layered architecture that promotes electrolyte penetration. Density Functional Theory (DFT) calculations reveal that the Co(OH) 2 @ZIF-L nanostructures have superior electrical conductivity compared to the individual components. Furthermore, a hybrid supercapacitor (HSC) based on Co(OH) 2 @ZIF-L/NF//AC exhibits an impressive energy density of 42 Wh kg −1 at a power density of 184.7 W kg −1 . This research provides new insights into the efficient synthesis of high-performance electroactive materials with unique spatial structures and expands the potential applications of ZIF materials.
研究领域:
材料科学
·
电化学
·
能源存储技术
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）