CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Siyu Chen,Xinyu Zhou,Guiying Li,Fang Yang
Metal-organic frameworks (MOFs) have great potential for a wide range of applications given their flexible structures and pore networks. Morphology control directly affects the properties and applications of MOFs. Unfortunately, governing the desired dimension and shape of MOFs is often limited by macrosystems that require organic solvents and additives while including time-consuming treatments. Microfluidics as a practical alternative provides precise manipulation of microscale liquid, has the potential to be a superior platform for directed crystal generation. Here we reported an AC electrokinetic (EK) mixing-assisted micro-synthesis method, which allowed the actively controlled synthesis of MOFs in aqueous phase. The effects of flow rate, molar-ratio of precursors, electric field intensity, and frequency on the synthesis of zeolitic imidazolate framework-8 (ZIF-8) were investigated. Using this method, the particle size of ZIF-8 were varied, and the geometry were changed between flower-like polyhedra, cubes, spheres, and rhombic dodecahedra. Furthermore, the synthesized various ZIF-8 provide different levels of immobilization sites based on their morphological deviations. The flower-like cubic ZIF-8 had defect structures and exhibited a maximum horseradish peroxidase (HRP) loading of about 16%. The study provides a simple, green and reliable tuning strategy for breaking the single morphological form of MOFs to enhance their physicochemical properties.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Junyuan Zhang,Ziwei Deng,Shuli Bai,Changyu Liu,Mengchen Zhang,Chao Peng,Xiaolong Xu,Jianbo Jia,Tiangang Luan
In this work, potassium acetate (KAc) was added during the synthesis of a Zn-Fe based metal-organic framework (Fe-ZIF-8) to increase the fixed amount of Fe while simultaneously enhancing the number of pores. Electrospinning was utilized to embed KAc-modified Fe-ZIF-8 (Fe-ZIF-8-Ac) into the polyacrylonitrile nanofiber mesh, to obtain a network composite (Fe@NC-Ac) with hierarchical porous structure. Fe@NC-Ac was co-pyrolyzed with thiourea , resulting in Fe, N, S co-doped carbon electrocatalyst . The electrochemical tests indicated that the prepared catalyst displayed relatively remarkable oxygen reduction reaction (ORR) catalytic activity, with an onset potential (E onset ) of 1.08 V (vs. reversible hydrogen electrode, RHE) and a half-wave potential (E 1/2 ) of 0.94 V, both higher than those of the commercial Pt/C (E onset = 0.95 V and E 1/2 = 0.84 V), respectively. Assembled into Zn-air batteries, the optimized catalyst exhibited higher open circuit voltage (1.698 V) and peak power density (90 mW cm −2 ) than those of the commercial 20 wt% Pt/C (1.402 V and 80 mW cm −2 ), respectively. This work provided a straightforward manufacturing strategy for the design of hierarchical porous carbon-based ORR catalysts with desirable performance.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2023
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IF 4.3
Liang Zhang,Junhui Xu,Jing Qian,Yazhen Wang
Neohesperidin dihydrochalcone (NHDC), as a high-intensity sweetener, has been widely used to be a new food additive . In this study, zeolitic imidazolate framework (ZIF)− 8/electrochemical reduced graphene oxide (ErGO) composite materials were favorably constructed onto the glassy carbon electrode (GCE) by two simple steps without any dispersant , and an electrochemical sensing of NHDC was developed. The morphology and its structure of the composite materials were characterized by SEM and Raman. The two-electron two-step redox mechanism was investigated by cyclic voltammetry (CV). The first anodic peak current of NHDC at ZIF-8/ErGO electrode is about 3.8 times as much as that of ErGO GCE and 42 times of ZIF-8 GCE under the optimized conditions. The linear relationship between oxidation peak current of NHDC and its concentration is ranged from 0.08 to 80 μM by linear sweep voltammetry (LSV), with the detection limit of 31.5 nM (based on S/N = 3). Finally, the modified electrode was used to detect NHDC in milk samples with a recovery rate of 98.3∼106.3%, which implied its feasibility for the determination of NHDC in actual samples.
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JOURNAL OF CHROMATOGRAPHY A
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2023
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IF 4.1
Wen Li,Xinyue Cui,Zilin Chen
An online capillary electrophoresis method based-lipase immobilized enzyme microreactor was developed for lipase kinetic study and inhibitor screening from compounds from natural products. Zeolitic Imidazolate Framework-8 (ZIF-8) has the advantages of large pore size, mild synthesis conditions and good biocompatibility. Lipase was immobilized on the inner wall of capillary with the help of the metal-organic framework ZIF-8. The results of electron microscopy showed that lipase could be aggregated and fixed on the inner wall of capillary by ZIF-8. After the experimental conditions including electrophoretic separation and enzymatic reaction were optimized, the baseline separation of substrate p-nitrophenyl acetate (pNPA) and product p-nitrophenol (pNP) was achieved within 3 min. The immobilized enzyme microreactor showed good repeatability and stability, and the determined Michaelis-Menten constant ( K m ) of lipase was 2.75 mM, which was lower than the kinetic constant determined in off-line reaction, indicating that the immobilized enzyme had a high affinity with the substrate. In addition, the IC 50 value of the positive control compound orlistat on lipase inhibition was 7.26 nM, which was consistent with the literature. Then the inhibitory activity of 10 compounds from natural products on lipase was evaluated by the ZIF-8-IMER. Among them, 7 compounds including baicalein, luteolin, epicatechin gallic acid, and chlorogenic acid, had a certain inhibitory effect on lipase. The molecular docking technology proved the interaction between the enzyme and the screened inhibitor, which provides a new method for the screening of lipase inhibitors.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Sen Zeng,Qingqing He,Qianting Wang,Junhui Si,Zhixiang Cui
Metal-organic framework (MOF)-based membranes have been considered a promising candidate for the separation membrane due to their high porosity and controlled pore structure. However, the fabrication of a robust MOF-based membrane is commonly subject to the limitations of MOF particle agglomeration and interface defects. Herein, we propose a facile and effective approach for the preparation of a robust zeolite imidazole framework-8 (ZIF-8)/protein hybrid membrane by introducing a phase-transited lysozyme (PTL) layer to mediate the growth of ZIF-8. The PTL layer was self-assembly on the ultrafiltration membrane and then ZIF-8 was in-situ growth to form a uniform ZIF-8/PTL hybrid layer. The prepared ZIF-8/PTL membrane possessed water permeance up to 39.5 L m −2 h −1 bar −1 and high rejections (>99.0%) for heavy metal ions . Furthermore, the fabricated ZIF-8/PTL hybrid membrane was verified to have excellent antimicrobial activity and antifouling performance. These results indicate that as a simple and robust approach, PTL modification can be employed to construct new interfaces for mediating MOF growth, and the prepared MOF-based membranes have great potential for water treatment .
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JOURNAL OF MATERIALS SCIENCE
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2023
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IF 4.5
Wang Qing,Qiu Mingyu,Yu Shijuan,Yang Xiaomin,Lao Liqin,Wu Zhiwei,Deng Qianjun,Yu Mingguang
Recently, papers with superhydrophobic surfaces and unique antibacterial and self-cleaning capabilities have attracted great attention due to its potential applications in cold chain logistics packaging. Therefore, a facile and versatile route to fabricate superhydrophobic and anti-bacterial adhesion dual-functional paper was reported. The approach was based on pufferfish-like structured ZIF-8 incorporated cellulose fibers. Specifically, cellulose fibers without any chemical pretreatment were used as templates for the in situ aqueous construction of pufferfish-like structured ZIF-8 with zinc nitrate as zinc source and dimethylimidazole as organic ligand. After paper-making and hydrophobicity treatment, the obtained paper possessed excellent superhydrophobic and anti-bacterial adhesion properties. These surfaces retained their water resistance after 30 finger-wipe cycles and 10 sandpaper abrasions. Moreover, the hydrophobic surface prepared also showed excellent anti-adhesion performance toward bacteria. This strategy route proposed here can significantly reduce or eliminate potential risks associated with various contamination.
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AICHE JOURNAL
·
2023
·Vol. 69
·期 9
·e18120
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IF 3.7
Wei-Min Liu,Heng Mao,Yu-Jie Wang,Shen-Hui Li,Ying-Nan Feng,Li-Hao Xu,Sen Wang,Chan Pei,Zhi-Ping Zhao
The construction of high-performance MOF-based hollow fiber composite membrane (HFCM) modules is a significant, yet challenging task for the biofuel production industry. In this study, a novel approach was taken to fabricate PDMS@ZIF-8/PVDF HFCMs in modules through a facile ZIF-8 self-crystallization synthesis followed by pressure-assisted PDMS infusion for pervaporation ethanol-water separation. The as-prepared HFCMs exhibited an ultrathin separation layer (thickness, 370 ± 35 nm), which was achieved through precise regulation of the ZIF-8 membrane and defect repair by PDMS infusion. Moreover, the strategy utilized in this study resolved the defect issues arising from MOF agglomeration in conventional composite membranes. Impressively, at the optimal packing density, the prepared membrane demonstrated a remarkable ethanol flux (1.11 kg m −2 h −1 ) with an PSI value (26.59 kg m −2 h −1 ) and showed promising long-term stability for the pervaporation of 5 wt% ethanol aqueous solution at 40°C.
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DESALINATION
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2023
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IF 9.9
Yuchen Du,Biplob Kumar Pramanik,Yang Zhang,Veeriah Jegatheesan
β-cyclodextrin (β-CD) and tannic acid (TA) together as an organic phase and zeolitic imidazolate framework-8 (ZIF-8) as an additive can be used along with trimesoyl chloride (TMC) as a monomer to synthesize nanofiltration (NF) membranes. Those membranes have better separation performance and provide higher flux. In this study, a new NF membrane was synthesized using them to investigate the effects of monomer concentration, substrate morphology, and reaction temperature on membrane performance . The results showed that when the concentrations of both β-CD and TA were 1 wt%, the membranes had the highest selectivity (2.99) for monovalent and divalent salts. A 10-fold increase in TMC concentration (0.05 to 0.5 wt%) optimized membrane selectivity and flux. When both spongy and cavernous structures were present in the substrate, the membranes could achieve >85 % removal of monovalent and divalent salts. After the introduction of ZIF-8, the roughness of the membrane increased, and the removal rate of monovalent salts decreased significantly, resulting in a salt selectivity of 7.97 and a flux up to 27.81 ± 1.17 L/(m 2 h). The growth of ZIF-8 on the membrane surface was assisted by an increase in the reaction temperature.
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ACS Nano
·
2023
·
IF 17.1
Mingxuan Song,Juanxia Xing,Huan Cai,Xin Gao,Chunyang Li,Changjin Liu,Xinmin Li,Xuhuai Fu,Shijia Ding,Wei Cheng,Rui Chen
Nanoparticle-natural enzyme complexes are receiving increasing attention as the promising signal reporters for colorimetric lateral flow immunoassay (LFIA). Nonetheless, it remains a challenge to develop the nanocomplexes with high loading efficiency, catalytic efficiency, and colorimetric signal brightness. Herein, inspired by pomegranate structure, we reported the synthesis of a colorimetric catalytic nanocomplex ((HRP@ZIF-8)3@PDA@HRP), using dopamine flexible scaffold-coated multishell porous zeolitic imidazolate framework-8 (ZIF-8) as a hierarchical scaffold to encapsulate horseradish peroxidase (HRP), and described its potential to promote an ultrasensitive colorimetric LFIA of cardiac troponin I (cTnI). (HRP@ZIF-8)3@PDA@HRP exhibited ultrahigh HRP loading efficiency and catalytic activity due to the epitaxial shell-by-shell overgrowth of porous ZIF-8 scaffold, which provided more cavities for enzyme immobilization and a diffusion path for the catalytic substrate. Furthermore, the polydopamine (PDA) layer on the (HRP@ZIF-8)3 surface both enhanced the colorimetric signal brightness and acted as a flexible scaffold to immobilize HRP, further increasing the amount of enzyme. Following integration with LFIA, the developed platform achieved an ultrasensitive colorimetric test strip assay for cTnI with pre- and postcatalytic naked-eye detection sensitivities of 0.5 ng mL–1 and 0.01 ng mL–1, respectively, which were 4/2- and 200/100-fold higher than gold nanoparticles (AuNPs)/PDA-based LFIA and comparable to chemiluminescence immunoassay. Further, the quantitative testing results of the developed colorimetric LFIA on 57 clinical serum samples agreed well with the clinical data. This work provides ideas for the design of natural enzymes-based colorimetric catalytic nanocomplex to encourage applications for the development of ultrasensitive LFIA for early diseases diagnosis.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Zi-Wei Wang,Kai-Wei Chen,Ao-Tian Gu,Xin-Yu Zhou,Peng Wang,Chun-Hui Gong,Ping Mao,Yan Jiao,Kai Chen,Ji-Gen Lu,Yi Yang
Radioactive iodine generated from nuclear waste and nuclear accidents can cause serious hazards to the environment and human body. In this study, bismuth-doped ZIF-8 composites (Bi 2 O 3 @ZIF-8) were synthesized by in situ synthesis at room temperature to study their adsorption of iodine in gaseous state and in solution. The Bi 2 O 3 @ZIF-8 composites were characterized and analyzed by means of tests. Bi 2 O 3 @ZIF-8 exhibited high specific surface area and contained abundant microporous structures. However, when the bismuth doping amount reached 10%, 10%-Bi 2 O 3 @ZIF-8 appeared mesoporous . The specific surface area of 1%-Bi 2 O 3 @ZIF-8, 5%-Bi 2 O 3 @ZIF-8 and 10%-Bi 2 O 3 @ZIF-8 could reach 1110.6 m 2 /g, 973.21 m 2 /g and 927.82 m 2 /g, respectively. The adsorption of gaseous iodine by 5%-Bi 2 O 3 @ZIF-8 reached equilibrium after 3.5 h with the maximum adsorption capacity of 298 wt%. And the maximum adsorption capacity of iodine in solution was 751.4 mg/g. The effects of the initial concentration of the solution, reaction temperature and contact time on the adsorption process were investigated. The adsorption of Bi 2 O 3 @ZIF-8 on iodine was consistent with the pseudo-second-order kinetics and the Langmuir model. The results of thermodynamic studies indicated that the adsorption of iodine by Bi 2 O 3 @ZIF-8 was spontaneous and exothermic. This study provides a reference for the synthesis of metal organic framework-based materials and provides theoretical guidance for the removal of practical radioactive iodine.
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Biointerphases
·
2023
·Vol. 18
·期 2
·
IF 2.1
Chen Huaxiang,Zhou Hao,Chen Mingchao,Quan Yan,Wang Chenglong,Gao Yujie,Wu Jindan
Oily wastewater discharged by industrial development is an important factor causing water pollution. Membrane separation technology has the advantages of low cost, simple operation, and high efficiency in the treatment of oily wastewater. However, membrane materials are easily eroded by microorganisms during long-term storage or use, thereby resulting in reduced separation efficiency. Herein, a zeolite imidazole skeleton-8@silver nanocluster composite polyacrylonitrile (ZIF-8@AgNCs/PAN) nanofibrous membrane was fabricated by electrospinning and in situ growth technology. The surface chemistry, morphology, and wettability of the composite membranes were characterized. The carboxyl groups on the surface of hydrolyzed PAN nanofibers, which can be complexed with zinc ions (Zn2+), are utilized as growth sites for porous metal organic frameworks (ZIF-8). Meanwhile, AgNCs are loaded into ZIF-8 to achieve stable hybridization of ZIF-8@AgNCs and nanofibers. The loading quantity of ZIF-8@AgNCs, which can dominantly affect the surface roughness and the porosity of the membranes, is regulated by the feeding amount of AgNCs. The ZIF-8@AgNCs/PAN membrane achieves effective oil-water separation with high separation efficiency toward petroleum ether-in-water emulsion (98.6%) and permeability (62 456 ± 1343 Lm−2 h−1 bar−1). Furthermore, the ZIF-8@AgNCs/PAN membrane possesses high antibacterial activity against Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus), which is beneficial for the long-term storage and use of the membrane.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengge Shang,Xiaoqian Peng,Jing Zhang,Xiaochan Liu,Zhipeng Yuan,Xinfu Zhao,Sijia Liu,Shimo Yu,Xibin Yi,Serguei Filatov
Adsorption natural gas (ANG) is a technology in which natural gas is stored on the surface of porous materials at relatively low pressures, which are promising candidates for adsorption of natural gas. Adsorbent materials with a large surface area and porous structure plays a significant role in the ANG technology, which holds promise in increasing the storage density for natural gas while decreasing the operating pressure. Here, we demonstrate a facile synthetic method for rational construction of a sodium alginate (SA)/ZIF-8 composite carbon aerogel (AZSCA) by incorporating ZIF-8 particles into SA aerogel through a directional freeze-drying method followed by the carbonization process. The structure characterization shows that AZSCA has a hierarchical porous structure, in which the micropores originated from MOF while the mesopores are derived from the three-dimensional network of the aerogel. The experimental results show that AZSCA achieved high methane adsorption of 181 cm3·g–1 at 65 bar and 298 K, along with higher isosteric heat of adsorption (Qst) throughout the adsorption range. Thus, the combination of MOF powders with aerogel can find potential applications in other gas adsorption.
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