International Journal of Electrochemical Science
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2023
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IF 1.5
Cang Wang,Min Pan,Hang Chen,Dajing Chen,Yuquan Chen
In this study, we present a novel zeolitic imidazolate framework-8 metal-organic framework /polysulfone (PSF) stereostructure with glucose oxidase (GOx) and horseradish peroxidase (HRP) encapsulated in ZIF-8 as nanoreactors. This work links the high biocatalytic activity and great stability of the enzymes encapsulated in ZIF-8 with the large surface area and mass transport of the threedimensional microporous PSF and highlights the pore structure of PSF, which blocks cells during whole blood testing. The prepared ZIF-8 capsule/PSF structure exhibits a 1.2-fold and 2.4-fold increase in sensitivity compared with the ZIF-8 capsule powder and bulk mixture of GOx and HRP, respectively. The modified ZIF-8 capsule/PSF glucose biosensor exhibited a 0-18 mM linear range and good selectivity. Furthermore, the prepared sensor attenuated less than 10% after 50 replicate whole blood tests. These advanced properties give the novel biocatalytic cascade ZIF-8 capsule/polysulfone stereostructure promising applications in whole blood monitoring.
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ACS Biomaterials Science & Engineering
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2023
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IF 5.8
Zhengjiang Xu,Yuan Zhang,Danping Lu,Guofang Zhang,Yang Li,Zufu Lu,Fei Wang,Guocheng Wang
Accumulation of senescent cells in the elderly impairs bone homeostasis. It is important to alleviate cell senescence and scavenge excessive oxidative stress for enhanced bone fracture healing in elderly patients. In this study, resveratrol (RSV), an antioxidant drug, was encapsulated in a biocompatible zeolitic imidazolate framework-8 (ZIF-8) nanoparticle to protect it from oxidation and improve its bioavailability. Cells responsible for bone healing, including osteoblasts, bone marrow-derived mesenchymal stem cells (BMSCs), macrophages, and endothelial cells, were used to evaluate the regulatory role of the nanoformulation in the alleviation of cellular senescence and promotion of cell functions. It was proved that the nanoformulation sustainably released RSV with well-preserved bioactivity and improved bioavailability. Cell experiments confirmed that ZIF-8/RSV was capable of alleviating the senescence of cells [human osteoblasts (HOBs), BMSCs, H2O2-induced senescent vascular endothelial cells (HUVECs)] and scavenging excessive intracellular reactive oxygen species (ROS). Excitingly, the ZIF-8/RSV improved the osteogenic ability of senescent osteoblasts and promoted macrophage M2 polarization. In addition, the ZIF-8/RSV also enhanced the angiogenic function of senescent HUVECs. More importantly, the ZIF-8/RSV nanoformulation outperformed the REV alone, indicating the critical role of encapsulation using ZIF-8. These findings suggest that the ZIF-8/RSV nanoformulation exhibits potential for bone fracture treatment in elderly patients.
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ENVIRONMENTAL TECHNOLOGY
·
2023
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IF 2.8
Qian Yang,Wensong Lin,Zhichang Duan,Sen Xu,Junnan Chen,Xin Mai
In this work, g-C3N4/ZIF-8 heterojunction photocatalysts were synthesised by the process by which the metal-organic framework ZIF-8 nanoparticles were grown onto the g-C3N4 layer in situ. Bismuth element was doped into the as-prepared g-C3N4/ZIF-8 material and a new type of Bi@g-C3N4/ZIF-8 composite photocatalysts was manufactured, in which the doping element acts in adjusting the bandgap in the photocatalysts. The prepared photocatalysts were characterised by XRD, FESEM, TEM, FTIR, XPS, UV–VIS DRS, photoluminescence and photo-electrochemical experiments. The results show that the ZIF-8 nanoparticles grown in situ were well-formed onto the g-C3N4 layer, and bismuth was evenly doped into the gaps of the g-C3N4/ZIF-8 framework. The degradation rate of methylene blue by CNZ-1.5(Bi)-12, which was a photocatalyst composed of 12% Bi-doped with g-C3N4/ZIF-8 material (the mass ratio of g-C3N4: ZIF-8 = 1:1.5), reached 86.6% under visible light irradiation within 60 min. The free radical scavenging experiment and electron spin resonance spectroscopy showed that ∙OH was the main active substance. Bismuth doping into the photocatalytic system promotes the excitation of electrons from the valence band to the conduction band and provides a good channel for the transmission of photogenerated carriers as well. It is achieved that intensive visible light absorption, the enhanced separation efficiency of photogenerated carriers, and excellent thermal stability and high recyclability in the novel composite photocatalyst, owing to the synergistic effect of the introduced bismuth with the heterostructure of g-C3N4/ZIF-8. Therefore, the synthesised Bi@g-C3N4/ZIF-8 heterojunction photocatalysts may be used as a good photocatalyst for purifying and degrading organic matter in sewage.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60704-60716
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IF 5.8
Zhang Nizi,Tang Chenliu,Bi Weixia,Sun Zhirong,Hu Xiang
Efficient removal of antibiotics from the aquatic environment is urgently needed due to their obstinate accumulation and non-biodegradability. In this study, a mesoporous carbon material (ZC-0.5) was successfully synthesized for the adsorption of sulfamethoxazole (SMX), one of the major antibiotics for the treatment of human and animal infections. ZIF-8 as the precursor of ZC-0.5, specifically, using cetyl trimethyl ammonium bromide (CTAB) and sodium laurate (SL) as dual templates and carbonizing at 800 ℃. This novel adsorbent exhibited a high proportion of mesopore (75.64%) and a large specific surface area (1459.73 m 2 ·g −1 ). The adsorption experiment examined the reusability of ZC-0.5 and that it could retain superior maximum adsorption capacities (167.45 mg∙L −1 ) after five cycles of adsorption and desorption. The adsorption process satisfied the pseudo-second-order kinetic (PSO) and mixed first- and second-order kinetic (MOE). It also satisfied the Freundlich and Sips isotherm models. Moreover, thermodynamic calculation indicated the adsorption process was spontaneous, endothermal, and entropy-increasing. Furthermore, plausible adsorption mechanisms were explained through van der Waals force, electrostatic interaction, hydrophobic force, π-π interaction, and hydrogen bond. This work offers a new efficient adsorbent for antibiotic elimination.
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LANGMUIR
·
2023
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IF 3.9
Yuyi Zhang,Yuting Du,Qinghong Yuan,Chao Hang,Xiaolei Zhang,Bingwen Hu,Qingyuan Jin,Mengdi Chen
Enhancing the fluorescence of organic dye by colloidal particles is one of the most promising routes to optimize fluorescence detection. However, in addition to metallic particles, which serve as the most frequently used particles and have been found to employ the plasmonic resonance to provide strong fluorescence enhancement, neither new types of colloidal particles nor new fluorescence mechanisms have been intensively explored in recent years. In this work, strongly enhanced fluorescence was observed when 2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI) molecules were simply mixed with zeolitic imidazolate framework-8 (ZIF-8) colloidal suspensions. Moreover, the enhancement factor ΔI = IHPBI+ZIF-8/IHPBI does not increase accordingly with the increasing amount of HPBI. To find out how the strong fluorescence was triggered and affected by the amount of HPBI, multiple techniques were applied to analyze the adsorption behavior. By combining analytical ultracentrifugation with first-principles calculations, we proposed that HPBI molecules were adsorbed onto the surface of ZIF-8 particles coordinatively and electrostatically, depending on the concentration of HPBI molecules. The coordinative adsorption would result in a new kind of fluorescence emitter. The new fluorescence emitters tend to distribute on the outer surface of ZIF-8 particles periodically. The distance between each fluorescence emitter is fixed and much smaller than the wavelength of the excitation light. Thus, it can be concluded that collective spontaneous emission might be triggered.
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Journal of Experimental Nanoscience
·
2022
·
IF 2.024
Zhen-Hong He,Yuan-Yuan Wei,Na Li,Yong-Chang Sun,Shao-Yan Yang,Kuan Wang,Weitao Wang,Xiaoxue Ma,Zhao-Tie Liu
Chemical utilization of CO2 is one of the fundamental strategies to synthesize value-added chemicals and reduce the CO2 emission. N-formyl-1,2,3,4-tetrahydroisoquinoline derivatives (FTHIQs) are important chemicals for the synthesis of medical intermediates and alkaloids. N-formylation of isoquinoline derivatives (IQs) with CO2 is an ideal protocol to synthesize the FTHIQs and utilize the CO2 source. In the present work, we prepared a heterogeneous Ru/ZIF-8 catalyst with a Ru loading of 2 wt% by a simple impregnation method and assessed its performances in the N-formylation of IQs and CO2 with H2. The Ru/ZIF-8 catalyst offered high IQ conversion of 98% and FTHIQ selectivity of 93% in the reaction under relatively mild conditions (150 °C, 2 MPa CO2, and 6 MPa H2). The catalyst possessed good universality and reusability, showing a potential in wide application of N-formylation of highly unsaturated nitrogen-containing isoquinolines.
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NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 14
·5603-5610
·
IF 3.069
Ning Wei,Xudong Zheng,Hongxiang Ou,Peilin Yu,Qiao Li,Shanshan Feng
Metal–organic framework (MOF) materials are a class of hybrid organic–inorganic supramolecular materials. Owing to their highest specific surface area, lowest crystal density and adjustable pore size and functional structure, MOF materials have the potential for some special applications in the field of adsorption of heavy metal contaminants. However, it is difficult to collect and reuse them in adsorption separation because of their nanometer size. Therefore, graphene oxide (GO) with good film-forming properties is used. In this paper, an f-ZIF-8@GO composite membrane material was developed by using GO and a zeolitic imidazolate framework (ZIF-8) material and was modified with 3-aminopropyl-triethoxysilane (APTES) by amine functionalization. After a series of structural characterizations, it was applied to the adsorption of copper ions in water and its adsorption properties were tested. The results showed that the adsorption capacity at pH = 6.0 was the largest, and an increase in temperature was not conducive to the adsorption reaction. The adsorption data were fitted to the Freundlich equation and the quasi-second order kinetic equation. The adsorption of Cu2+ on water was multilayer, and the equilibrium adsorption capacity was up to 1872.24 mg g−1. The prepared materials exhibited high selectivity to copper ions; they could be reused as adsorbents for many times and maintained high adsorption capacity. This kind of material is of great significance for the adsorption and separation of heavy metal ions in water.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2018
·Vol. 165
·期 14
·H1004
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IF 3.662
Ankita Sinha,Yujin Huang,Dhanjai,Kaixin Ma,Huimin Zhao
The present paper reports synthesis and development of nitrogen doped porous carbon nanoframeworks (N-CNFs) based electrochemical sensor for sensitive detection of tannic acid (TA) which is one of the potentially harmful organic pollutants. N-CNFs were prepared using zeolitic imidazolate frameworks (ZIF-8) as precursor and silica protected calcination strategy. The as prepared N-CNFs were characterized by different microscopic (scanning electron microscopy; SEM, transmission electron microscopy; TEM), spectroscopic (raman, X-ray diffraction; XRD, X-ray photoelectron spectroscopy; XPS, fourier transform infrared; FTIR), adsorption (Brunauer–Emmett–Teller; BET) and electrochemical impedance spectroscopic (EIS) methods. N-CNFs showed large surface area, nitrogen rich content, high conductivity and interconnecting porous channels which helped in achieving high electrochemical performances toward sensing applications. The present work discusses a simple methodology for detection of TA at N-CNFs modified glassy carbon electrode (GCE) using voltammetric techniques. The fabricated N-CNFs electrode showed high sensitivity, selectivity and reproducibility for TA detection with detection limit (LOD) and quantification limit as low as 0.86 μg mL−1 and 2.85 μg mL−1 respectively. The electrode exhibited a satisfied recovery between 90.31%–106.2% for detection of TA in polluted water.
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JOURNAL OF HAZARDOUS MATERIALS
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2018
·
IF 6.434
Na Li,Long Zhou,Xiaoying Jin,Gary Owens,Zuliang Chen
In this paper, a Zeolite Imidazole Framework-8 (ZIF-8), was investigated for the removal of a mixture of two common antibiotics, tetracycline (TC) and oxytetracycline hydrochloride (OTC). Batch experiments showed that 90.7% of TC and 82.5% of OTC were simultaneously removed using ZIF-8. The maximum adsorption capacities for TC and OTC were 303.0 and 312.5 mg g −1 , respectively. For both antibiotics’ adsorption followed pseudo-second-order kinetics and best fit the Langmuir adsorption model with R 2 of 0.963 and 0.981, for TC and OTC at 303 K, respectively. The relatively large specific surface area of ZIF-8 (1158.2 m 2 g -1 ) combined with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) indicated that both antibiotics were adsorbed on to the surface of ZIF-8. X-ray powder diffraction (XRD) and Fourier Transform Infrared (FTIR) spectroscopy both indicated the presence of benzene ring structures, associated with both pollutants, on ZIF-8 after reaction; which confirmed adsorption was occurring. XPS also showed the presence of C O double bonds on the surface of ZIF-8 indicating the presence of antibiotics. The adsorption mechanism most likely involved π-π interactions between the conjugated groups in TC/OTC and the imidazole rings of ZIF-8.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Jianxin Chen,Kaili Liu,Minghuang Jiang,Jian Han,Mengling Liu,Chongbin Wang,Chunli Li
A novel core–shell nanophere based on porous hollow carbon spheres (PHCS) and ZIF-8 was successfully prepared by a simple hydrothermal method . The PHCS as a supporter could effectively inhibit the aggregation of ZIF-8 nanoparticles and increased its dispersibility. Results indicated that the obtained PHCS-15@ZIF-8 nanophere with porous structure, high specific surface area (1140 m 2 g −1 ) and numerous oxygen-containing functional groups exhibited an excellent sorption capability for Pb 2+ . The maximum adsorption capacity of PHCS-15@ZIF-8 for Pb 2+ reached up to 462.9 mg g −1 , higher than the pure ZIF-8 (310.5 mg g −1 ). The adsorption data better followed with Freundlich isotherm and pseudo-second-order model. The effects of PHCS content, initial concentration, solution pH and competing ions on the sorption performance were discussed in detail. The possible sorption mechanism was also systematically analyzed by zeta potential , FT-IR, AAS and XPS studies. In addition, desorption and regeneration studies showed that PHCS-15@ZIF-8 still remained over 90% removal efficiency after five cycles.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
·
IF 3.571
Sizhu Ren,Conghai Li,Zhilei Tan,Ying Hou,Shiru Jia,Jiandong Cui
In this study, carbonic anhydrase (CA, EC 4.2.1.1) molecules were embedded into metal–organic frameworks (MOFs) via co-precipitation (CA@ZIF-8), and then these CA@ZIF-8 nanocomposites were encapsulated in the poly(vinyl alcohol) (PVA)–chitosan (CS) hydrogel networks to prepare CA@ZIF-8–PVA–CS composite hydrogels (PVA/CS/CA@ZIF-8) with high activity, stability, and reusability. The immobilization efficiency of CA was greater than 70%, suggesting the high immobilization efficiency. The prepared PVA/CS/CA@ZIF-8 composite membranes displayed excellent higher stability against a high temperature, denaturants, and acid than free CA and CA@ZIF-8. Furthermore, these membranes exhibited an excellent performance for CO2 capture. The amount of calcium carbonate obtained by PVA/CS/CA@ZIF-8 hydrogel membranes was 20- and 1.63-fold than free CA and CA@ZIF-8 composites, respectively. Furthermore, the hydrogel membranes exhibited superior reusability and mechanical strength. The hydrogel membrane maitained 50% of its original activity after 11 cycles. However, CA@ZIF-8 completely lost activity. These results indicated that the PVA/CS/CA@ZIF-8 membranes can be efficiently applied to capture CO2 sequestration.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2018
·
IF 2.631
Xue Wang,Dawei Shang,Shaojuan Zeng,Yuanming Wang,Xiaochun Zhang,Xiangping Zhang,Jindun Liu
Absorption and adsorption technology as widely used methods have been reported for carbon dioxide (CO 2 ) separation. In order to combine the advantages of absorption and adsorption methods, ionic liquids (ILs) as absorption function and zeolitic imidazolate framework-8 (ZIF-8) as adsorption function were integrated into a slurry to efficiently capture CO 2 by the absorption-adsorption method. In this study, two pyridinium-based ILs, [C 4 Py][NTf 2 ] and [C 4 Py][N(CN) 2 ] were synthesized, and mixed with different concentration of ZIF-8 to form hybrid slurries. CO 2 solubility in the different hybrid slurries at temperatures from 303.15 to 333.15 K was measured. The results indicated that CO 2 solubility increases significantly with increasing pressure and decreases with increasing temperature. Moreover, CO 2 solubility increases with the increase of ZIF-8 content, indicating that the addition of ZIF-8 into ILs can obviously enhance CO 2 solubility. CO 2 solubility in the ZIF-8/[C 4 Py][NTf 2 ] slurry increases by 24% compared with the corresponding pure IL at 303.15 K and 1.80 MPa. The absorption-adsorption mechanism was studied using FT-IR and NMR spectroscopy. It was demonstrated that CO 2 absorption and adsorption in the ZIF-8/ILs hybrid slurries is a physical process. Furthermore, the ZIF-8/[C 4 Py][NTf 2 ] slurry can also keep the stable absorption performance after five consecutive absorption and desorption cycles. Considering the excellent capacity, thermal stability and recyclability, the porous materials/ILs slurry will provide new insight to CO 2 capture compared with the conventional absorbents.
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