CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Runjiang Guo,Hongdong Wang,Ran Tian,Dongliang Shi,Hua Li,Yao Li,Hezhou Liu
In this report, a novel hollow boxes shape ZnSnO 3 is synthesized via a one-pot surfactant-free method. We synthesize CNT@ZnSnO 3 hollow boxes via hydrothermal reaction by using the Zn-MOF(ZIF-8) as the Zn source at the first time. Several characterization techniques are used to investigate the structure, morphology, composition and specific surface area of CNT@ZnSnO 3 . CNT@ZnSnO 3 hollow boxes demonstrated large specific surface area (up to 45.73 m 2 /g), which is favorable for the strong gas sensor response. The ethanol sensor based on CNT@ZnSnO 3 hollow boxes exhibited high response of ethanol up to 166 at 240 °C at the concentration of 100 ppm, which is about 8 times higher than the sensing response of ZnSnO 3 nanocubes. Moreover, CNT@ZnSnO 3 hollow boxes based ethanol sensor also shows the excellent selectivity and stability. As a novel green gas sensor, CNT@ZnSnO 3 hollow boxes show the great potential in the gas sensing field.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Xin Xu,Danyang Nan,Huan Yang,Shuang Pan,Hui Liu,Xiaoli Hu
Quercetin is a nature polyphenolic flavonoid compound, which act as antioxidant and radical scavengers in cells. However, such activities strongly depend on the intracellular microenvironment, which has become an urgency to develop a more stable method for better use of quercetin. Herein, we report a facile approach to fabricate Quercetin@ZIF-90 (QZ) with a narrow size distribution about 100 nm, the synthesized QZ exhibits considerable antioxidant and radical scavenger ability comparing to bare quercetin. Moreover, the experiment results indicated that QZ was sensitive to adenosine 5′-triphosphate (ATP) and pH, thus QZ was applied as a novel antioxidant for the determination of ATP. In brief, though 3, 3′, 5, 5′-tetramethylbenzidine (TMB) could be oxidized to blue cation radical complex by oxidase-like BSA-MnO 2 nanosheets (MNs) at neutral pH, QZ could sufficiently protect against MNs-induced TMB cation radicals reaction, which means no obvious color change in MNs-TMB system after the addition of QZ. However, ATP could induced collapse of QZ due to the interaction between ATP and Zn 2+ allowing the release of quercetin from ZIF-90 shell, and the inhibition effect to the MNs was weakened, leading to the recovery of blue oxTMB. In this way, a novel “Off-On” colorimetric method for ATP sensing was established, and the method displayed a good linear relationship ranging from 2.0 μ mol L −1 to 80.0 μ mol L −1 . The reported strategy is also capable of ATP sensing in MCF-7 cell lysates, which illustrated our method exhibited high sensitivity and selectivity.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Shufang Cui,Yuanchun He,Xiangjie Bo
In this work, FeCo nanoparticles encapsulated in graphitic carbon layers are derived by direct pyrolysis of Prussian blue/ZIF-67. First, the Prussian blue nanocubes with size of 100–150 nm are selected as cores for growth of ZIF-67 metal organic frameworks . Subsequent direct pyrolysis of Prussian blue/ZIF-67 in nitrogen atmosphere enables the formation of carbon nanospheres with FeCo nanoparticles embedded into the nitrogen-doped graphitic carbon layers. The encapsulation of FeCo nanoparticles into the nitrogen-doped carbon layers favors the electron penetration from the underlying FeCo nanoparticles to the nitrogen-doped graphitic carbon layers, tuning the electron density and the electronic properties at the carbon overlayers and then promoting the both hydrogen and oxygen evolution reaction activity. By optimizing the ratio between the Prussian blue and ZIF-67, the active and inexpensive carbon layers-encapsulated FeCo nanoparticles achieve high activity towards the hydrogen evolution reaction, exhibiting a low overpotential of 106 mV at 10 mA cm −2 as well as a low Tafel slope of 90.0 mV dec −1 . As oxygen evolution reaction electrocatalysts , the carbon layers-encapsulated FeCo nanoparticles deliver an overpotential of 312 mV at 10 mA cm −2 and a low Tafel slope of 40.6 mV dec −1 . Severing as both anode and cathode, the carbon layers-encapsulated FeCo nanoparticles show a potential of 1.495 V at 10 mA cm −2 for water splitting, which is close to the noble metal benchmarks of Pt/C and RuO 2 counterparts. The carbon layers-encapsulated FeCo nanoparticles can be used as an attractive replacement for electrocatalytic water splitting.
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Polymers
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2019
·Vol. 11
·期 12
·1986
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IF 3.164
Shaoxiang Lee,Yunna Lei,Dong Wang,Chunxu Li,Jiaji Cheng,Jiaping Wang,Wenqiao Meng,Meng Liu
ZIF-8 nanoparticle-doped polyvinyl alcohol (PVA)-S-MC films were prepared via casting method. The effect of different concentrations of ZIF-8 on the physical properties and structural characterization of the films were investigated. The results indicated that ZIF-8 could increase the water resistance and mechanical property of the membrane. Through FTIR, scanning electron microscope (SEM), atomic force microscope (AFM), and TGA analysis, it was found that ZIF-8 changed the phenomenon of macromolecule agglomeration and improved the thermal stability of the membrane. The breathable behavior of the film was also studied through oxygen permeability and water vapor permeability analysis. The result illustrated that the breathability of the film improved significantly by adding ZIF-8. The maximum reached when the weight ratio of ZIF-8 was 0.01 wt %. The property expands the application of PVA/starch blend film in the postharvest technology of fruits and vegetables.Keywords:PVA/starch;composite membrane;metal-organic frameworks
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PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
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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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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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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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MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Juanjuan Cai,Leilei Jiang,Huaming Wei,Chongqing Wang,Liang Yu,Lixiong Zhang
In the present work, a carbon/cobalt composite was prepared and evaluated for adsorption of ecologically harmful tannic acid (TA). The composite was prepared by simply mixing phenolic resin with ZIF-67 and following by carbonization . TEM and SEM images showed that ZIF-67 was etched by phenolic resin and cobalt nanoparticles were formed and evenly distributed in carbon. Macroporous structure was generated between the carbonized phenolic resin and ZIF-67. N 2 adsorption-desorption isotherms results exhibited that the composite also had both micro- and meso-pores (average pore size of 5 nm) with a high surface area of 393 m 2 g −1 . Porous structure and evenly distributed cobalt nanoparticles facilitated the diffusion and adsorption of TA due to the formation of the complex between TA macromolecules and cobalt. The highest observed adsorption amount was as high as 2778 mg g −1 , significantly higher than that of the carbon prepared from carbonization of phenolic resin (205 mg g −1 ) and ZIF-67 (1375 mg g −1 ). The carbon composite material is easy to recover and reuse due to the magnetic property . The reuse experiment also showed high stability of the composite. All of the results indicated a great potential of the developed carbon composite material in wastewater treatment in the industry.
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高影响因子
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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ACS Catalysis
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2019
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IF 12.221
Chao Hu,Silin Bai,Lijun Gao,Sucen Liang,Juan Yang,Shao-Dong Cheng,Shao-Bo Mi,Jieshan Qiu
Metal-doped zeolitic imidazolate framework-8 (ZIF-8)-derived carbon materials are attractive for the electrocatalytic reduction of CO2 into CO. In such carbon materials, due to the fusion and aggregation of ZIF-8 precursors during the high-temperature pyrolysis process, it is desirable yet still challenging to create a high specific surface area with more active sites available for reacting with reactants. Using SiO2 as a protective coating on the ZIF-8 surface, we synthesize Fe, N-co-doped porous carbon nanoparticles (Fe-CNPs) which possess a hierarchical pore structure with a specific surface area as high as 1156.6 m2 g–1, much higher than the counterparts without a SiO2 coating (360.1 m2 g–1). Over these highly porous Fe-CNPs, the total current densities are more than 3 times higher than those of the lowly porous ones for the electrochemical CO2 reduction. More importantly, the maximum CO Faradaic efficiency for Fe-CNPs increases from ca. 75.0 to 98.8% in a concentrated KHCO3 solution (1 mol L–1). The porosity-induced high selectivity for CO production is also revealed on Ni-doped and Co-doped ZIF-derived CNPs, suggesting a new pathway for designing high-performance carbon catalysts through engineering the porosity for the electrochemical CO2 reduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Shihang Guo,Pengcheng Zhang,Yi Feng,Zhongguo Wang,Xiaodan Li,Jianfeng Yao
Cellulose nanofibers (CNFs) are used to string ZIF-67 particles and interlaced Co 9 S 8 /porous carbon composite (Co 9 S 8 /C-CNFs) is obtained via carbonization and sulphidation of ZIF-67/CNFs composites. The CNFs can effectively limit the growth of ZIF-67 particles and avoid the agglomeration and most importantly, serve as the conductive skeleton to “bridge” carbonized ZIF-67 particles after carbonization. Due to the unique structure and the improved conductivity, Co 9 S 8 /C-CNFs as anode of lithium-ion batteries exhibits enhanced electrochemical properties and the specific capacity is 700 mAh g −1 at current density of 500 mA g −1 after 150 cycles compared to that of 342 mAh g −1 for samples without CNFs incorporation. Such nanoscale design may boost to explore other nanocomposites for energy storage.
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Mingmin Jia,Xiong-Fei Zhang,Yi Feng,Yichen Zhou,Jianfeng Yao
ZIF-8@cellulose nanofiber (ZIF-8@CNF) composite membranes were prepared via in-situ growing ZIF-8 crystals on cellulose nanofibers (CNFs) and vacuum filtration. Owning to the electrostatic forces between –COO - of CNFs and Zn 2+ of ZIF-8, ZIF-8 crystals were anchored homogenously on CNFs. With ZIF-8 loading increased to sufficiently high, the intrinsic selectivity of ZIF-8 played an important role for gas separation. As a result, the optimum separation performance is achieved over ZIF-8@CNF-70 composite membrane with CO 2 permeability of 550 Barrer and CO 2 /N 2 and CO 2 /CH 4 ideal selectivity of 45.5 and 36.2, respectively.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
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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