JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Ziheng Song,Quan Zhao,Jianyu Wang,Yong-Jun Tian,Wen Wang,Hanze Ma,Qianfeng Pan,Sheng Yuan,Shilin Guo,Da Zhang,Yanxiong Ren,Jing Ma,Guangwei He,Zhongyi Jiang
Metal organic framework (MOF) membranes represent one of the most promising materials for helium (He) separation membranes. However, conventional fabrication methods using high-boiling-point solvents often generate defects during activation. This work employs a mixed-solvent-assisted electrodeposition method for ZIF-7 membranes wherein the DMF solvent lowers the ligand deprotonation energy barrier and the methanol solvent increases the solution supersaturation, synergistically enhancing the nucleation rate and nucleation density. Concurrently, the introduction of methanol leads to reduced precursor solubility, thereby reducing the ZIF-7 growth rate. Additionally, the use of methanol allows activation of the ZIF-7 via mild conditions, suppressing the formation of defects. As a result, ultrathin (160 nm) ZIF-7 membranes with low crystallinity and reduced intercrystalline defects are fabricated for the first time, achieving efficient He separation. The membrane on anodic aluminum oxide (AAO) demonstrates a He/N 2 selectivity of 261.2, which is nearly an order of magnitude higher than other reported He-selective MOF membranes. Continuous operation exceeding 144 h confirms exceptional stability. Successful fabrication on porous ceramic substrates with maintained separation performance underscores application potential of our strategy.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 47
·24975-24984
·
IF 14.511
Lili Gong,Zhili Cai,Qi Wu,Lu Liu,Can Wang,Linglong Shan,Xianghai Meng,Shuangjiang Luo,Zhichang Liu,Suojiang Zhang
Mixed matrix membranes (MMMs) are highly promising for natural gas sweetening due to their high microporosity and outstanding gas separation performance. However, MMMs are frequently challenged by the polymer/filler interfacial incompatibility, leading to the deterioration of gas separation performance. In this study, the mixed-linker ZIF-7-8 was employed as a filler by finely tuning the molecular sieving for CO2/CH4 separation. An amino-functionalized ionic liquid ([C3NH2Mim][Cl]) was introduced for constructing the interface connection between the ZIF-7-8 filler and polymer matrix through coordination and hydrogen bonding, which was verified by extended X-ray absorption fine structure (EXAFS) and electron paramagnetic resonance (EPR). The design of interface interaction through an IL is crucial to improve the interface compatibility and the CO2/CH4 separation performance. The newly developed 20% ZIF-7-8-IL (1%)/PI and 25% ZIF-7-8-IL (1%)/PI MMMs displayed a dramatic improvement of CO2 permeability by 244.2% and 291.6%, from 308 to 1060 and 1206 barrer, respectively, for pure-gas separation, compared to the pristine polyimide matrix. Moreover, the 25% ZIF-7-8-IL (1%)/PI MMM also demonstrated outstanding low-temperature mixed-gas CO2/CH4 separation performance in the temperature range of −45–35 °C, far beyond the 2018 mixed-gas CO2/CH4 upper bound.
研究领域:
材料科学
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环境工程
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Jun Gao,Danyang Fan,Qinghua Chu,Haixia Lyu,Zenghong Xie
In this study, a novel surface molecularly imprinted polymer (MIP) based on zeolitic imidazolate framework (MIP@ZIF-7) was prepared using dibutyl phthalate (DBP) as template via “one-pot” method, which was used for extraction and determination four phthalates (PAEs) in food samples coupled with high performance liquid chromatography (HPLC). The obtained MIP@ZIF-7 was characterized by fourier transform infrared spectrometer (FT-IR), energy dispersive spectrum (EDS), scanning electron microscopy (SEM), nitrogen adsorption–desorption and contact angle tester. The adsorption performance of the prepared ZIF-7, MIP and MIP@ZIF-7 was compared and the results showed that MIP@ZIF-7 exhibited higher adsorption capacity and selectivity for PAEs owing to combining the high specific surface area and excellent stability of ZIF and the specific recognition of MIP. Subsequently, several requisite synthesis and extraction parameters were investigated. Under the optimal conditions, the linear range of the method was 1–100 μg L −1 and the detection limits were in a range of 0.1–0.8 μg L −1 . The spiked recovery rate of PAEs from drinking water, carbonated beverages and fruit juices ranged from 77.1 ± 1.5% to 100.7 ± 3.4%, with relative standard deviation of 1.65–4.87% (n = 3). The results indicated that MIP@ZIF-7 could be effectively employed for extraction and determination trace PAEs in food.
研究领域:
食品科学
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分析化学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ziheng Li,Tiantian Li,Wenji Zheng,Xiangcun Li,Jiadong Zhu,Miao Yu,Xiaobin Jiang,Xuemei Wu,Gaohong He,Jianjun Zhang
The perfluorocarbons (PFCs), such as CF 4 , serving as crucial plasma etching gases, have caused a significant threat to the global greenhouse effect. Therefore, the enrichment and recycling of CF 4 is particularly important. However, since the CF 4 /N 2 mixture used for plasma etching with CF 4 content lower than 10 vol %, it is urgently necessary to develop N 2 -preferred transmissible membranes. Herein, cyclic crown ethers with hollow cavity were proposed to be encapsulated within ZIF-7 cages to sieving N 2 and CF 4 by “window-cage dual sieving”, while minimizing the sacrifice of N 2 permeance. Specifically, due to its larger size than the window size of ZIF-7, 15-crown-5 (15C5) was physically restricted into ZIF-7 cages, achieving permanent size sieving. As characterized by TEM and BET results, with the 15C5 modification ratio increasing, the ZIF-7 cage size was tuned from 0.46 nm to 0.43 nm, leading to improved N 2 /CF 4 selectivity. Meanwhile, the ether-oxygen bonding of 15C5 enhanced the interfacial compatibility between the 6FDA-DAM polymer matrix and ZIF-7, improving the filler loading as high as 50 wt%. The resultant 15C5 3 @ZIF-7/PI MMMs at filler loading of 40 wt% achieved N 2 permeability and N 2 /CF 4 ideal selectivity of up to 83.2 Barrer and 6.79, which were improved by 253.0 % and 223.3 %, compared to the pure PI membrane. Together with the good long-term stability and mechanical properties, 15C5@ZIF-7/PI MMMs provide a bright prospect in the membrane based recovery of PFCs for industrial applications.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Dudu Li,Zibo Yang,Lixia Yang,Chao Ma,Mao Ye,Yuxiu Sun,Zhihua Qiao,Aibing Chen
Metal-organic framework (MOF) glass is a promising candidate material for gas separation. However, MOF glasses have low porosity, which is not conducive to prepare high permeance membranes. Herein, we incorporated porous ZIF-7 into ZIF-62 glass membrane to prepare self-supported flux melted glass membranes for gas separation. The introduction of ZIF-7 not only improved pore continuity but also enhanced the porosity of the resulting glass membranes. In addition, the melting nature of ZIF-62 promotes the co-melting of ZIF-7 and thus effectively improves the interfacial compatibility. In such cases, the typical a g [(ZIF-62) 0.7 (ZIF-7) 0.3 ] membrane exhibits the ideal selectivity of 98.6 for H 2 /CH 4 and 35.3 for CO 2 /CH 4 , with H 2 permeance and CO 2 permeance of 120.3 and 43.1 GPU, respectively, exceeding the corresponding Robenson upper bounds. Besides, the a g [(ZIF-62) 0.7 (ZIF-7) 0.3 ] membrane displays good long-term test stability for 48 h under variable pressure conditions. This work may provide a new design concept and experimental support for the construction of new MOF membranes for gas separation.
研究领域:
材料科学
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化学工程
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高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 40
·4894-4901
·
IF 2.073
Ya-Ting Zhao,Li-Qing Yu,Xin Xia,Xin-Yu Yang,Wei Hu,Yun-Kai Lv
The adsorption mechanism and desorption properties of volatile organic compounds (VOCs) in a zeolitic imidazolate framework (ZIF-7) were studied by on-line thermal desorption-gas chromatography (TD-GC), and a high efficiency method for determination of harmful indoor gas levels has been developed. The loading volume, loading flow rate and desorption temperature were optimized. Additionally, ZIF-7 has been proved to be an effective adsorbent and its adsorption performance is superior to that of commercial Tenax TA and activated carbon. It has been proved that ZIF-7 is an ideal adsorbent for VOCs. It was suggested that there are hydrophobic interactions, π–π stacking effects, “gate-opening” effects and molecular size effects between adsorbates and ZIF-7. Therefore, the developed ZIF-7-based TD-GC method offered an excellent performance with a detection limit of 1.22–2.38 ng (S/N = 3), a quantification limit of 4.05–7.94 ng (S/N = 10), and a good linearity (R2 = 0.99), and relative standard deviation values (RSD, n = 5) were found to be in the range of 1.69–7.97%, and tube-to-tube reproducibility for three parallel tubes was 8.01%.
研究领域:
材料科学
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环境科学
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高影响因子
CARBON
·
2026
·
IF 12.7
Jiale Ma,Ying Huang,Hanjie Huang,Xiaoxiao Zhao,Huiyang Jiang,Qianqian Niu,Chenbo Liu,Meng Zong
The rapid development of modern communication technology has exacerbated electromagnetic pollution, creating a strong demand for high-performance electromagnetic wave (EMW) absorption materials. Metal-organic frameworks (MOFs) derivatives are promising candidates owing to their tunable structures and high specific surface areas. However, conventional MOFs-based absorbers still suffer from magnetic component aggregation or insufficient dielectric loss, leading to poor impedance matching and narrow effective absorption bandwidth (EAB). Herein, flexible flower-like non-magnetic ZIF-7-derived nitrogen-doped carbon films were fabricated via electrospinning and controlled carbonization. By regulating carbonization temperature and precursor concentration, the morphology and electromagnetic parameters were optimized. The synergistic effect of the unique flower-like structure and nitrogen doping enhances dielectric loss and optimizes impedance matching. Consequently, ZIF-7-NCF-2 achieves a minimum reflection loss (RL) of −75.50 dB at 2.57 mm and an ultra-broad EAB of 11.36 GHz at 3.35 mm, covering almost the entire X and Ku bands. This work provides a feasible strategy for designing high-performance and broadband non-magnetic MOFs-derived EMW absorption materials.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Xiao-Xue Jiang,Li-Qing Yu,Yue-Na Sun,Yuan Li,Hui-Min Li,Yun-Kai Lv
In this work, we reported the preparation of the hollow zeolitic imidazolate framework-7 (ZIF-7) via etching ZIF-7 with tannic acid , and further fabricated the hollow ZIF-7 coated fiber for the solid phase microextraction (SPME) of the five volatile biomarkers (acetone, isopropanol, hexanal , hexanol and decanal) generated from breast cancer cell lines. The hollow structure not only endowed higher extraction performance for the SPME of analytes, but also improved the diffusion rate of the analytes inside the hollow ZIF-7. Under the optimal conditions, the hollow ZIF-7 coated fiber offered high extraction capacity (25–153 mg g −1 ) and enhancement factors (EFs, 2023–11250) for the five biomarkers, good linearity (R 2 > 0.9918) of acetone and isopropanol (2.5–500 μg L −1 ) and hexanol, hexanal, and decanal (1.0–100 μg L −1 ), low limits of detection (S/N = 3) of 0.07–0.53 μg L −1 and the limit of quantifications (LOQs, S/N = 10) of 0.23–1.76 μg L −1 . The precisions (RSDs, %) for intra-day (n = 6), inter-day (n = 5) and fiber-to-fiber (n = 6) were 2.8–7.5%, 4.3–8.5%, and 4.2–14.6%, respectively. The high EFs of the hollow ZIF-7 coated fiber for the five biomarkers resulted from the integrated effects of the large surface area, the unique porous structure, hydrophobic interaction, gate-opening effect, and enhanced properties after etching including faster mass transport, multiple active components, and more exposed active sites. The fabricated hollow ZIF-7 coated fiber lasted at least 140 cycles of extraction/desorption/aging without obvious decrease of extraction ability and no change of crystal structure. Finally, the hollow ZIF-7 coated fiber combined with GC-FID had been successfully used to detect the five biomarkers in the headspace gas of human breast cancer cell lines (MDA-MB-231) and normal mammary cell lines (CCD-1095Sk) with the recoveries of 84–105%. These results revealed the prospect of hollow MOFs as efficient adsorbents for sample pretreatment .
研究领域:
分析化学
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癌症诊断
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Suling Zhang,Weixuan Yao,Jianbo Ying,Hongting Zhao
Zeolitic imidazolate frameworks (ZIFs) consist of metal nodes connected to imidazolate linkers, having both the properties of metal-organic frameworks (MOFs) and inorganic zeolites, such as controllable pore sizes, high porosity and surface areas, as well as exceptional thermal and chemical stability, thereby making them a class of attractive materials for diverse analytical applications. In this study, we reported a facile magnetization process of ZIF-7 (zinc benzimidazolate) for simultaneous magnetic extraction of polycyclic aromatic hydrocarbons (PAHs) by simply mixing ZIF-7 and polydopamine (PDA)-coated Fe 3 O 4 nanoparticles (PDA@Fe 3 O 4 ) in solutions. Functional groups (−OH and −NH 2 ), provided by PDA as a highly efficient molecular linker, could attract and anchor ZIF-7 through noncovalent adsorption and covalent cross-link interactions, thereby promoting the complete magnetization of ZIFs and enhancing their stability and reusability. The bridging ligand benzimidazolate, could be bonded with PAHs because of its high surface area, large pores, accessible coordinative unsaturated sites (π-complexation), and π-π stacking action. This ZIF-based magnetic solid-phase extraction (SPE), coupled with gas chromatography/tandem mass spectrometry (GC/MS), was further evaluated for analysis of PAHs from rainwater and air samples of particulate matter less than 2.5 μm in diameter (PM 2.5 ). The main effective parameters, including ionic strength, solution pH, extraction time, desorption solvent and desorption time, were investigated, respectively. Under optimized conditions, the developed method based on Fe 3 O 4 @PDA/ZIF-7 gave detection limits of 0.71–5.79 ng/L, and quantification limits of 2.50–19.2 ng/L for PAHs, respectively. The relative standard deviations for intra-day and inter-day analyses were in the range of 3.1–9.1% and 6.1–12.7%, respectively. The PAHs founded in PM 2.5 were in the range of 0.40–6.79 ng/m 3 . Good recoveries (>82%) with low relative standard deviations (≤9.2%) were achieved. This method was demonstrated to be an accurate, convenient and sensitive pretreatment procedure for trace analysis of environmental water and air samples.
研究领域:
环境科学
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分析化学
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材料科学
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空气与水污染
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纳米材料
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DOI
高影响因子
ChemPlusChem
·
2014
·Vol. 79
·期 7
·907-913
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IF 3.242
Xiang Wang,Pengcheng Huang,Ping Yu,Lifen Yang,Lanqun Mao
In this study, a new method was developed for the rapid and cost-effective synthesis of nanosized zeolitic imidazolate framework-7 (ZIF-7) nanocrystals with a high yield and a low molar ratio of benzimidazole ligand to metal salt (2:1) by using N , N′- dimethylformamide (DMF) as the solvent and zinc acetate dihydrate (Zn(OAc) 2 ⋅2 H 2 O) as the metal source. The synthesized ZIF-7 nanocrystals have a size of approximately 50–80 nm, and tend to aggregate or become intergrown to form irregular nanoparticles of about 200–300 nm in size. The morphology and yield of the ZIF-7 nanocrystals can be tuned easily by changing the synthetic parameters such as the composition of the solvent and concentrations of reagents. The synthesized ZIF-7 nanocrystals exhibit good thermal and chemical stability, CO 2 capture capability, and fluorescent properties. Remarkably, we find that the synthetic strategy developed here can be extended to the syntheses of other kinds of ZIFs including ZIF-69 and ZIF-90. This study offers a new, simple synthetic strategy for the high-yield preparation of ZIF materials. Graphical Zeolitic nanocrystal control : We have developed a new method for the rapid and cost-effective synthesis of nanosized zeolitic imidazolate framework (ZIF-7) nanocrystals with a high yield and a stoichiometric molar ratio of ligand to metal salt (2:1) by using N , N ′-dimethylformamide (DMF) as the solvent and zinc acetate as the metal source (see figure). This strategy can also be extended to the synthesis of ZIF-69 and ZIF-90.
研究领域:
材料化学
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纳米科技
·
配位聚合物
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多孔材料
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气体吸附
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功能材料
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DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-6
·
IF 5.479
Yu Li-Qing,Su Fei-Hong,Ma Meng-Yuan,Lv Yun-Kai
A method is described for non-invasive glucose monitoring of diabetics by means of breath analysis. The metal-organic frameworks (MOFs) ZIF-7, UiO-66 and MOF-5 were chosen as sorbents in packed tubes for sampling and preconcentration of acetone and isopropanol which are established diabetes biomarkers. The MOF UiO-66 was found to be the most appropriate sorbent. Following thermal desorption, acetone and isopropanol where quantified by GC. The method has low limits of detection (0.79–0.84 μg·L −1 ) and wide linear ranges (5–2000 μg·L −1 ). It is assumed that the good performance of UiO-66 as a sorbent results from its large surface area and unique porous structure, and from van der Waals interactions. The relative standard deviation for six replicate cycles of sampling and preconcentration using one 50 mg UiO-66 packed tube ranged between 2.3 and 6.7% for intra-day assays, and from 2.7 to 4.3% for inter-day assays. A tube packed with 50 mg of UiO-66 packed tube can be used in over 120 cycles of adsorption/desorption without significant loss of collection efficiency. The GC method has been applied for the analysis of diabetic breath samples, and the recoveries from spiked samples ranged from 89.1 to 107.6%.
Schematic presentation of metal-organic frameworks as sorbents combined with thermal desorption-gas chromatography for the determination of acetone and isopropanol in exhaled breath of diabetics.
研究领域:
分析化学
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材料科学
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医学诊断
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Xuecheng Zhang,Jun Gao,Qinghua Chu,Haixia Lyu,Zenghong Xie
A novel hybrid material (ZIF-7-NH 2 @MIP) combining high adsorption capacity of amino-functional zeolitic imidazolate framework and specific recognition ability of dual-template molecular imprinted polymer was synthesized. The prepared ZIF-7-NH 2 @MIP was characterized by a range of instrumental techniques and combined with high performance liquid chromatography for the detection of four phthalate esters. The limits of detection of the four PAEs were below the maximum residue limit of GB 3838-2002 in China, ranging from 0.04 to 0.08 μg L −1 . The recoveries of the three real samples of mineral water , carbonated drinks and pulpy juices spiked at 10 μg L −1 were 88.68–98.58% and the relative standard deviations was 1.19–3.40%. The above results showed that the obtained absorbent exhibited many advantages for extracting analytes in aqueous solution especially complex environment due to the combination of the superior hydrothermal and large specific surface area of the amino-functionalized ZIF-7-NH 2 and the specific identification of the dual-template molecular imprinted polymer.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）