COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
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IF 5.8
Wanling Cai,Wei Zhang,Zuliang Chen
Metal-organic frameworks (MOFs) have a high specific surface area and inherent biodegradability due to their unique structure and composition . As well, owing to the properties of nanomaterials and especially their magnetic features, Fe 3 O 4 nanoparticles and MOFs composite materials have great potential in the design and application of drug release. The present work: firstly, investigated norfloxacin loading in magnetic metal organic framework (Fe 3 O 4 @ZIF-8); and secondly, studied the release of norfloxacin and its antibacterial activity . Results showed the release efficiencies reached 97 % at 310 K after 84 h (pH 7.4). Drug release behavior was tested at various pH levels and it was found that Fe 3 O 4 @ZIF-8 has pH-sensitive properties. Furthermore, the release model calculation illustrated that the release process fitted well to the Bhaskar model. The magnetic properties of Fe 3 O 4 @ZIF-8 confirmed that the composite has potential application for a targeted drug delivery system. The mechanism of pH-responsive norfloxacin release was combined with diffusion , ion exchange and electrostatic repulsion. Furthermore, the antibacterial activities of Fe 3 O 4 @ZIF-8 and NOR-Fe 3 O 4 @ZIF-8 were tested against Escherichia coli . Results showed that Fe 3 O 4 @ZIF-8 had good biocompatibility while NOR-Fe 3 O 4 @ZIF-8 can deter or inhibit the actions of microorganisms .
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PubMed
高影响因子
Journal of Energy Storage
·
2023
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IF 9.4
Jiongfan Wang,Xin Chen,Lingling Chen,Xinyu Li,Jianrong Xiao
The shuttle effect of polysulfide and slow reaction kinetics has hindered the commercialization of lithium–sulfur batteries. Here, metal organic framework (MOF)-derived nitrogen-doped carbon was used as templates, and the continuous interspersed filamentary network structure of multi-walled carbon nanotubes (MWCNT) was used as a modifier to synthesize Co-NC@MWCNT. The exposure of Co-MOF with a high density of catalytic sites in the pores effectively improves the sulfur stability capacity of the composite and inhibits the shuttle effect. The outermost layer of coated MWCNTs and the intermediate layer of N-doped porous carbon effectively protected the Co 2+ active site of the dodecahedral configuration from easy deactivation and agglomeration. The prepared Co-NC@MWCNT composite had an initial discharge capacity of 1240 mA h g −1 (0.1C), it maintained a low decay rate of 0.054 % after 1000 cycles (0.5C). The graphite-like layer gap and multilayer tube structure of the networked MWCNT can effectively mitigate volume expansion during charging and discharging and provide Li + transport channels to improve electrical conductivity . Moreover, the energy storage devices developed as part of this work have excellent electrochemical properties and have a noteworthy industrial potential.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Yongfa Cheng,Lingzhi Cheong,Yongyong Li,Yongjiang Lou,Shiqian Fu
The high toxicity and bioaccumulation effects of nitroaromatic pesticides and their serious environmental risks have led to a sharp increase in public concern about pesticide residues. Present work developed a direct, rapid, sensitive and reliable Candida rugosa lipase (CRL)@ the ordered macro-microporous ZIF-8 (MAC-ZIF-8) nanofibers biosensor (CRL@MAC-ZIF-8 nanofibers) for methyl parathion and chlornitrofen residues detection in lake water. The biosensors fabricated by the CRL@MAC-ZIF-8 nanofibers demonstrated wide linear range for both methyl parathion (0.5–114 µM) and chlornitrofen (1–40 µM) detection. The biosensors also demonstrated good reusability for methyl parathion detection with retainment of more than 97% of its initial response after scanning continuously for 100 times. During 1 month storage stability test at 4 °C, the fabricated biosensor demonstrated excellent stability for methyl parathion detection with retainment of 86%-100% of its initial response. Meanwhile, the biosensors also demonstrated good recovery rates when the biosensors were used to detect methyl parathion and chlornitrofen residues in lake water sample.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Mingzhi Chen,Sifan Zhang,Chenyu Zhu,Huan Zhang,Lihua Zhu,Yingliang Feng,Jiexiang Wang,Qian Yang,Bingqian Liu,Wentao Xu
MOFs (metal-organic frameworks) materials have been widely applied in sensing and catalysis, with the advantages of large surface area, numerous active sites, controllable size and morphology. Herein, we report the preparation of the caged PdZn/NC catalysts with the PdZn alloy nanoparticles on carbon doping with nitrogen owing high electrocatalytic performance by using a hydrothermal synthesis and pyrolysis strategy. The caged structure and PdZn alloy are demonstrated by a series of advanced characterization techniques. The material combines the advantages of bimetallic alloy and MOFs cage structure to realize highly efficient electrocatalytic oxidation of ethanol oxidation reactions (EOR) and methanol oxidation reactions (MOR) simultaneously. Electrochemical test results show that PdZn/NC-2 has a mass activity of 2.41 A mg −1 pd and 2.64 A mg −1 pd for methanol and ethanol oxidation, respectively, which is 12.68 times (MOR) and 14.67 times (EOR) higher than that of commercial Pd/C. This is probably attributed to the cage-like structure of PdZn/NC separating the Pd nanoclusters , resulting in high Pd dispersion. Simultaneously, the electronic property of Pd is adjusted after the formation of the complete PdZn alloy, improving the desorption of the carbon-based intermediates from the Pd active sites. This increases the CO poisoning resistance, resulting in good alcohol electrocatalytic oxidation activity and stability.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Wenxin Wang,Zhichao Hou,Hanxiao Zhang,Xinyu Ma,Gang Wang,Jinlei Miao,Tingting Fan
Whereas harsh environmental wastewater purification and polluted air filtration is eagerly desired, traditional membranes cannot meet such demands due to its poor chemical/thermal resistance which remains a great challenge. Herein, a harsh environmental-tolerant zeolitic imidazolate frameworks (ZIF-8) @polyphenylene sulfide (PPS) membrane with tunable hierarchical structure for efficient oil/water separation and air filtration under extreme conditions was proposed. Highly robust and flexible biomimetic ZIF-8@PPS membrane with lotus-leaf papillary structure was successfully developed via large-scale melt-blown PPS nonwovens followed by in-situ growth porous ZIF-8. The biomimetic ZIF-8@PPS membrane truly combining the advantages of special polymeric PPS and inorganic zeolite for harsh environmental wastewater and air treatment, which exhibits smart switchable super-oleophobic/hydrophobic characteristic and PM 2.5 purification performance under harsh water/oil mixture (strong acid/alkali) and high temperature (exceed 200 °C) conditions. The biomimetic ZIF-8@PPS membrane exhibits extremely high flux (28569.4 L m -2 h -1 ) and separation efficiency (99.932%) for oil/water separation, and excellent filtration efficiency (99.5%) for PM 2.5 removal. Impressively, the robust and flexible ZIF-8@PPS membrane with strong chemical/thermal resistance could still maintain excellent separation/filtration performance even after numerous cyclic tests under harsh environments. The harsh environmental tolerant ZIF-8@PPS membrane with large-scale roll-to-roll production ability holds great promise for environmental protection under extreme conditions.
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CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Rujing Xue,Yina Zhuge,Guoliang Liu,Fujuan Liu
ZIF-L, a metal-organic framework (MOF) material, has a two-dimensional (2D) foliation, a large specific surface area, excellent thermal stability and CO 2 adsorption performance, respectively. In this work, in order to further improve the thermal insulation performance of SiO 2 aerogel composite fabrics , ZIF-L powder was first prepared as a reinforcing particle, and then added to silica aerogel. Finally, SiO 2 /AF/ZIF-L composites were obtained by solution impregnation method. The influence of different ZIF-L concentrations on the insulation performance of composites and their influencing factors were studied. Furthermore, these composites were fully characterized using BET measurement, Instron 5967, precision transient thermal performance tester, infrared thermal imager, insulation performance test, thermogravimetric analyzer, and dynamic thermomechanical analyzer. The results showed that 0.12% SiO 2 /AF/ZIF-L composites had excellent thermal insulation performance, with a thermal conductivity as low as 0.029 W/(m·K). In addition, SiO 2 /AF/ZIF-L composites fabricated by atmospheric drying method had the best thermal insulation performance under the conditions of gel time of 24 h, hydrolysis time of 5 h, and polycondensation pH value of 5–6.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yan Shang,Jing Xu,Yue Ma,Zezhong Li,Qian Li
Photocatalytic hydrogen production was a potential strategy to solve energy shortage and environmental pollution. One of the valuable research directions for improving photocatalytic efficiency was to prepare catalysts in an efficient and low-cost way. Lamellar Sm 2 WO 6 and dodecahedron Zeolitic Imidazolate Framework-67 (ZIF-67) have been prepared successfully based on morphology control. Sm 2 WO 6 /ZIF-67 was prepared by a novel in situ growth scheme, which was confirmed by crystal structure, morphology and elemental composition analysis . The close interaction between Sm 2 WO 6 and ZIF-67 was confirmed by photoelectrochemical measurements. Based on the design of band structure , the S-type heterojunction was constructed. The research results of this paper provided a reference for exploring non-noble metal composite materials and demonstrated great potential in photocatalytic.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Baojie Dou,Shaojian Lin,Yafang Wang,Lin Yang,Anrong Yao,Hongjiang Liao,Siyao Tian,Jiaojiao Shang,Jianwu Lan
The complex wastewater containing water-soluble dyes and water-insoluble oils has given rise to significant environmental concerns that demand urgent remediation. Herein, a novel “smart” multifunctional sponge (ZIF-8@PMS) stepwise decorated with ZIF-8 nanoparticles and CO2-responsive copolymer (poly(2-(diethylamino) ethyl methacrylate-co-3-(trimethoxysilyl)propyl acrylate-co-stearyl methacrylate) was successfully prepared for CO2 controllable oil/water separation and dyes removal. The results revealed that the sponge coated with CO2-responsive copolymer for three cycles (ZIF-8@PMS-3) exhibited optimal comprehensive properties. The ZIF-8@PMS-3 had excellent compressive-resilient characteristics and chemical stability. As expected, it displayed tunable wettability and charged state under the regulation of CO2. Based on these features, ZIF-8@PMS-3 presented highly efficient removal of oil and dyes, even for the dye-containing oil/water emulsions, via a synergistic combination of adsorption and separation methods. The adsorption capacity for oil and various organic solvents ranged from 21.3 to 50 g g–1. The maximum adsorption capacities toward anionic dyes: methyl orange with 1205.89 mg g–1 and methyl blue with 880.00 mg g–1 in the presence of CO2 through electrostatic interaction. In the absence of CO2, it achieved maximum adsorption capacities for cationic dyes, including malachite green with 1246.15 mg g–1 and rhodamine B with 203 mg g–1, primarily driven by π–π interactions. According to distinct adsorption mechanisms, ZIF-8@PMS-3 could selectively adsorb either anionic or cationic dyes by exploiting CO2 as a trigger. Furthermore, the separation efficiencies for both types of oil/water emulsions surpassed 99.9%, with respective fluxes of 1566.99 L m–2 h–1 (water-in-oil emulsion) and 310.37 L m–2 h–1 (oil-in-water emulsion). Additionally, the as-prepared sponges exhibited remarkable antibacterial properties and exceptional recyclability. Therefore, the ZIF-8@PMS-3 holds substantial promise for potential applications in practical industrial wastewater treatment.
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高影响因子
WOOD SCIENCE AND TECHNOLOGY
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2022
·Vol. 56
·期 6
·1657-1673
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IF 2.898
Zhu Gang,Li Hui,Deng Shuduan,Zhang Chaoling,Kang Kunyong,Zhang Xupeng,Li Kaiqian
Metal–organic frameworks (MOFs)/wood are attractive hybrid materials that offer a range of multifunctional properties by integrating MOFs into wood substrates. Although a good foundation has been laid in studies, it is clear that studies are limited to the conjugation of wood with monometallic MOFs. Research on the utility of novel hybrid materials designed incorporating bimetallic MOFs into wood has not yet been encountered. Herein, a novel bimetallic cobalt/zinc-based zeolite imidazolate frameworks (Co/Zn-ZIF)@wood hybrid material was successfully fabricated through in situ growth of Co-ZIF-67 and Zn-ZIF-8 within balsa wood channel arrays. SEM images indicated that Co/Zn-ZIF exhibited smaller particle sizes compared with Co and Zn monometallic MOFs. The resulting composite displays high removal efficiency up to 97.2% for methylene blue and the adsorption capacity can reach 223.6 mg·g −1 at 298 K. Moreover, the incorporation of Co/Zn-ZIF has better effect on thermal stability at the early stage and char layer formatting of wood substrate than monometallic MOFs. Compared with the monometallic MOF additives, the peak of heat release rate of the Co/Zn-ZIF@wood hybrid materials exhibited a drastic decline by 67.5% from 94.5 to 30.7 W·g −1 and the total heat release from 7.7 to 3.5 kJ·g −1 . In addition, the introduction of Co/Zn-ZIF increases the limiting oxygen index (LOI) values of the prepared composites, and the treated wood had a strong self-extinguishing ability, which manifested that Co/Zn-ZIF@wood had excellent flame retardancy. This work offers a new avenue for designing and constructing functionalized MOFs@wood composites that may boost their environmental- and green building-related applications.
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Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 47
·24975-24984
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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.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Dong Wang,Yumeng Wang,Xuefen Wang
In this work, a thorn ball-like three-dimensional (3D) heterostructured ZIF-67@α-MnO 2 catalyst consisting of ZIF-67 nanocages impaled by α-MnO 2 nanorods were robustly embedded in polyacrylonitrile nanofibers by electrospinning technique for highly efficient removal of low-molecular-weight pollutants (LMWPs, like dyes and antibiotics) from wastewater. Benefiting from abundant active sites and enhanced charge transfer abilities provided by ZIF-67@α-MnO 2 nanoparticles, the optimal ZIF-67@α-MnO 2 nanofibrous membranes (NFMs) showed a significant response towards acid fuchsin (AF) in terms of comparable adsorption capacity (2495 mg/g) and impressive catalytic activity (degradation degree of 99 % AF within 20 min). In addition, the resultant membranes possessed satisfactory versatile catalytic activity toward tetracycline (95.3 %), norfloxacin (98.4 %) and doxycycline hyclate (89.2 %). Besides, the resultant membranes had high permeability of 1302 L·m − 2 ·h − 1 driven by gravity and could efficiently treat 370.5 L·m − 2 AF (20 ppm), which was significantly higher than that of pure ZIF-67 NFMs (141.8 L·m − 2 ). The successful fabricating of such membrane with extraordinary adsorption and catalytic performance provided a promising approach for high-performance catalytic membranes.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
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IF 9.224
Hao Zhou,Zhiqiang Zou,Lingmei Dai,Dehua Liu,Wei Du
Enzyme immobilization in hierarchical macro–microporous metal–organic frameworks (MOFs) is greatly desirable but challenging due to the poor stability of MOFs in a practical biocatalysis process. Herein, we prepared a series of single-crystalline ordered macro–microporous zeolitic imidazolate framework-8 (SOM-ZIF-8) with different macropore sizes of 180, 270, and 360 nm for lipase immobilization and investigated their performance in a practical biodiesel production process. Under an ethanol-assisted infiltration strategy, the potential of SOM-ZIF-8 for enzyme immobilization was unleashed from the nonwettability arising from its exceptional surface hydrophobicity, with a significant increase by 123.8% in the loading capacity. However, a fatty acid-induced complete decomposition of ZIF-8 in a nonaqueous system of biodiesel production was observed. To address this challenge, a degradation mechanism coupling the intermolecular autoionization of carboxylic acid was proposed, and a template-assisted pyrolysis approach was adopted to prepare the SOM-ZIF-8-derived carbon material that not only well preserved the 3D-ordered structure of the precursor but also exhibited enhanced chemical stability. Moreover, the carbon derivative exhibited great potential for enzyme immobilization, with a 22.9% increase in loading capacity, a 35.9% increase in specific activity, and a 12.7% increase in activity recovery, compared with SOM-ZIF-8. It is anticipated that this study will shed new light on the realistic design and modification of MOFs for the immobilization of enzymes in biocatalysis and extensive applications.
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