IONICS
·
2022
·Vol. 28
·期 10
·4843-4851
·
IF 2.961
Li Feifei,Liu Liqun,Liu Tingting,Zhang Mingxiao
In recent years, metal–organic framework (MOF) has become a hot electrode material for electrochemistry. However, it has rarely been studied in uric acid detection. In this paper, cubic Ni-based MOF has been synthesized by Ni(NO 3 ) 2 ·6H 2 O and H3BTC in room temperature; then, Au nanoparticles (Au NPs) were decorated on Ni-MOF by in situ synthesis method. This electrochemical sensor can response to uric acid (UA) in solution and enhance response signal of UA detection. Next, some experiment conditions including pH, scan rate, and proportion between Au NPS and Ni-MOF have been optimized with cyclic voltammetry (CV) and differential pulse voltammetry (DPV). And then, the Au/Ni-MOF has been charactered with scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy. Experiment finding, this electrochemical sensor has a wide linearity range from 15 to 500 μM with a low detection limit of 5.6 μM (S/N = 3). Besides, the sensor constructed also has excellent selectivity and stability. Finally, the Au/Ni-MOF sensor was successfully applied in uric acid detection in the body’s serum.
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NANOTECHNOLOGY
·
2023
·Vol. 34
·期 42
·425102
·
IF 3.5
Jie Zheng,Rui Ding,Lu Xing,Muhammad Sohail,Yifeng Wang,Xing Zhang,He Huang
NfsB (nitroreductase from Escherichia coli) can catalyze nitroaromatic compounds to aromatic amines under mild conditions. Compared with the purified enzyme NfsB, we found that the crude enzyme demonstrated better thermal stability and tolerance against a wide pH range, rendering it convenient to use and cost-effective as it did not require any downstream processing. In addition, we introduced metal-organic frameworks to immobilize the crude-NfsB. The resulting composite, crude-NfsB@ZIF-90, showed excellent catalytic performance and reusability, and it also demonstrated good catalytic activity in organic solvents, rendering it more efficient for the removal of nitroaromatic contaminants in complex environments. The nitroreductase-ZIF-90 biocatalyst can be used for fluorescent labeling of carbohydrates, which is favorable for the study of the function of carbohydrates.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Weicheng Cui,Hongye Bai,Jianpeng Shang,Fagen Wang,Dongbo Xu,Jinrui Ding,Weiqiang Fan,Weidong Shi
Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO 2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO 2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic , compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO 2 has reached about 3.35 times of bare TiO 2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection ( η injection ) of 92.8% and charge separation ( η separation ) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO 2 shows a long-term stability ( < 10% decay) after 4 h of continuous illumination. This work provided a novel and rational strategy about the integration of the inorganic semiconductor and organic MOF , which can provide a new insight into understanding MOF-based catalysts for PEC water splitting.
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IONICS
·
2022
·Vol. 28
·期 12
·5571-5580
·
IF 2.961
Wu Meijuan,Wang Liwei,Xu Fugang,Ma Guangran
A Ni-MOF superstructure composed of 2D nanosheet (2D Ni-MOFss) was prepared and further combined with reduce graphene oxide (rGO) for electrochemical detection of acetaminophen (AP). The structure and properties of the 2D Ni-MOFss were characterized by SEM, XRD, XPS, and electrochemical method. The loosened 2D lamella structure endowed the 2D Ni-MOFss with improved electrocatalysis and low charge transfer resistance than bulky Ni-MOF. After integration with rGO, the composite 2D Ni-MOFss/rGO shows significantly enhanced catalysis for redox reaction of AP with high current response and low over-potential. An electrochemical sensor for AP based on the 2D Ni-MOFss/rGO shows a wide linear range of 0.036 to 50 μM, and a low detection limit of 0.012 μM. The sensor with high sensitivity, good selectivity, and stability also show satisfied recovery for detecting AP in real sample. The facile preparation and enhanced catalysis make these 2D MOF composite attractive materials for electrochemical sensors.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Chen Wen,Ligang Chen,Yating Xie,Jingying Bai,Xin Liang
In order to explore the effect of Fe doped CoP nanosheets on both hydrogen evolution reaction (HER) and hydrodesulfurization (HDS), FeCoP/C nanosheets have been successfully synthesized by the solvothermal process with Fe doped ZIF-67/C for the growth of FeCo-hydroxides nanosheets , as well as a following low-temperature phosphorization process. The performance evaluation results show that the FeCoP/C nanosheet exhibits an excellent acidic HER performance and an ordinary HDS performance compared to CoP/C and FeP/C catalysts. Experimental characterization and density functional theory results show that the high HER activity of the FeCoP/C nanosheet can be attributed to the fact that the nanosheet structure facilitates the exposure of active sites and the doped Fe atoms make CoP have a suitable hydrogen adsorption energy , while the ordinary HDS activity of the FeCoP/C nanosheet can be attributed to the fact that the doped Fe atoms can inhibit the cleavage of C–S bonds by CoP.
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CATALYSIS LETTERS
·
2020
·Vol. 150
·期 12
·3394-3401
·
IF 2.482
Qiao Chenxia,Jia Wenlan,Zhong Qiming,Liu Bingyu,Zhang Yifu,Meng Changgong,Tian Fuping
Abstract Novel Cu-nanoparticles (NPs) embedded in porous carbon materials (Cu@C-x) were prepared by one-pot pyrolysis of metal–organic frameworks (MOF) HKUST-1 at different temperatures. The obtained material Cu@C-x was used as a cost-effective catalyst for the hydrogenation of nitrobenzene using NaBH 4 as the reducing agent under mild reaction conditions. By considering the catalyst preparation and the catalytic activity, a pyrolysis temperature of 400 °C was finally chosen to synthesize the optimal catalyst. When the aromatic nitro compounds with reducible groups, such as cyano, halogen, and alkyl groups, were tested in this catalytic hydrogenation, an excellent selectivity approaching 100% was achieved. In the recycling experiment, a significant decrease in nitrobenzene conversion was observed in the third cycle, mainly due to the very small amount of catalyst employed in the reaction. Hence, the easily prepared and cost-effective Cu@C-400 catalyst fabricated in this study demonstrates potential for the applications in selective reduction of aromatic nitro compounds. Graphic Abstract The catalyst Cu@C-400 exhibited 100 % conversion and high selectivity for the hydrogenation of industrially relevant nitroarenes.
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Biosensors-Basel
·
2022
·Vol. 12
·期 7
·544
·
IF 5.743
Jingyi Li,Ning Zhang,Xin Yang,Xinting Yang,Zengli Wang,Huan Liu
This study presents a novel composite thin film based on rhodamine B encapsulated into MOF-5 (Metal Organic Frameworks) as a fluorescence sensor for the real-time detection of the freshness of chilled pork. The composite film can adsorb and respond to the volatile amines produced by the quality deterioration of pork during storage at 4 °C, with the fluorescence intensity of RhB decreasing over time. The quantitative model used for predicting the freshness indicator (total volatile base nitrogen) of pork was built using the fluorescence spectra (excited at 340 nm) of the RhB@MOF-5 composite film combined with the partial least squares (PLS) algorithm, providing Rc2and Rp2values of 0.908 and 0.821 and RMSEC(root mean square error of calibration) and RMSEP (root mean square error of prediction) values of 3.435 mg/100 g and 3.647 mg/100 g, respectively. The qualitative model established by the partial least squares discriminant analysis (PLS-DA) algorithm was able to accurately classify pork samples as fresh, acceptable or spoiled, and the accuracy was 86.67%.
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RSC Advances
·
2022
·Vol. 12
·期 52
·33716-33724
·
IF 4.036
Jie Hu,Lei Li,Hao Li,Ying Zhai,Fushun Tang,Zhe Zhang,Banglin Chen
The mixed bimetal metal–organic framework Ni0.37Co0.63-MOF-74 has been constructed by the solvothermal method for NO adsorption. The results showed that bimetal Ni0.37Co0.63-MOF-74 takes up NO with a capacity of up to 174.3 cc g−1 under ambient conditions, which is 16.3% higher than that of the best single metal Co-MOF-74. The IAST adsorption selectivity for a NO/CO2 binary mixture can reach a maximum of 710 at low adsorption partial pressure, while the regeneration performance can be retained even after five cyclic adsorption–desorption experiments. Its separation performance was further confirmed by breakthrough experiments, indicating this new bimetal Ni0.37Co0.63-MOF-74 as one of the best materials for NO adsorption and separation in flue gas.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xia Gao,Guangming Sun,Xinke Wang,Xiaodong Lin,Shuo Wang,Yaqing Liu
As a vital signaling molecules, hydrogen sulfide (H 2 S) with abnormal concentrations is correlated with many diseases. Therefore, development of novel assays for quantitative and selective detection of H 2 S is important. Herein, we synthesized a host-guest metal-organic framework (MOF), i.e., RhB/UiO-66-N 3 (here, RhB means rhodamine B) by a mildly and simply way, as reaction-based ratiometric fluorescent nanosensor for selective detection and intracellular imaging of H 2 S. In the presence of H 2 S, the RhB/UiO-66-N 3 exhibits dual emissions at 425 nm and 575 nm under irradiation of single excitation wavelength. The blue fluorescence at 425 nm (F 425 ) is attributed to the H 2 S-mediated biorthogonal reduction of azide to amine, and the red fluorescence at 575 nm (F 575 ) originating from RhB is served as an internal reference. With increasing concentrations of H 2 S, the intensity of blue fluorescence increases while the intensity of red fluorescence has no obvious change. With F 425 /F 575 as readout, turn-on and ratiometric fluorescence detection of H 2 S was achieved with good selectivity and sensitivity. Interestingly, RhB/UiO-66-N 3 can be tuned from microscale to nanoscale sizes, and endows high stability under physiological conditions. The exogenous and endogenous H 2 S in live cells has been further targeted and imaged, demonstrating its considerable potential for extensive applications.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Rui Ding,Yan Dai,Wenji Zheng,Xiangcun Li,Xiaoming Yan,Yi Liu,Xuehua Ruan,Shaojie Li,Xiaochen Yang,Kai Yang,Gaohong He
The trade-off between gas permeability and selectivity represents a huge challenge for membrane separation. In this work, we design unique polystyrene-acrylate (PSA) modified hollow ZIF-8 (PHZ) nanospheres via a facile hard template-incomplete etching strategy as fillers for mixed matrix membranes (MMMs). In the vesicles shaped PHZ, the hollow core builds a low-resistance CO 2 transport freeway, leading to improved CO 2 permeability. Meanwhile, the outside PSA layer intensifies the interface affinity between ZIF-8 and Pebax through molecular chains entanglements and hydrogen bonding, enhancing membrane selectivity. Through controlling the PSA etching process, both the hollow core with tunable size and the outside PSA layer with adjustable thickness are achieved. The 10 wt% PHZ-2/Pebax MMMs present the best performance with a CO 2 permeability of 172.4 Barrer and CO 2 /N 2 selectivity of 87.9. The higher CO 2 /N 2 selectivity proves that the PSA layer on the PHZ has better compatibility with Pebax. The higher CO 2 permeability is attributed to the low-resistance hollow core. The gas separation performance of PHZ-based MMMs not only well exceeded the 2008 Robeson upper-bond line but also was superior to those of other published MOF-based MMMs. The concept of vesicle-shaped PHZ paves a way to concurrently enhance both the gas permeability and selectivity of MMMs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Mao Fu,Xuepeng Deng,Shi-Qiang Wang,Fenglin Yang,Li-Chiang Lin,Michael J. Zaworotko,Yingchao Dong
To find sustainable water solutions, the development of high capacity, scalable robust adsorbents and mechanistic insight about their performance offers the potential to effectively address the global challenges of water scarcity and water contamination. We herein rationally design Zr-cluster defective MOF-808 (MOF-808 def ) with exposed carboxyl groups, a robust zirconium metal–organic framework (Zr-MOF), exhibiting high adsorption capacity (q max ∼ 296 mg·g −1 ) coupled with high selectivitity for tetracycline (TC) antibiotics, outperforming other water-stable MOFs, commercial and inorganic nano-adsorbents. MOF-808 def functions well across a wide range of contaminant concentrations (from trace to high-concentration) and even in harsh conditions ( e.g. , high acidity and salinity). Both experimental and simulation results indicate that the mechanism of adsorption involves both physisorption and chemisorption via hydrogen bonding, electrostatic interactions (EIs) and C-O-C covalent bonding via esterification. Computational studies confirm that hydrogen bonding plays a key role in strong guest–host interactions between TCs and MOF-808 def . Further, defects resulting from missing-Zr-clusters in MOF-808 def are confirmed to enhance adsorption performance. Specifically, the defect sites present exposed carboxyl groups from MOF-808 def linker ligands that selectively react with –OH groups (phenol and tertiary alcohol moieties) in TC via esterification. These defects drive highly selective adsorption even at low concentrations of TCs ( e.g. , 500 ppb). Aiming for more than enhanced performance, economic estimation and scalable engineered reactor tests revealed that MOF-808 def and its nano-composites are free of environmental risks and offer promise for sustainable water treatment at pilot scale. The use of defect-engineering rationales is a molecule-level design concept that could be generally useful for the development of the next generation of MOF-based nano-adsorbents for sustainable water treatment applications.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Lu-Ye Yang,Jian-Hua Cao,Bo-Ran Cai,Tian Liang,Da-Yong Wu
A composite separator is prepared with polyacrylonitrile (PAN) and metal-organic framework (MOF) particles by electrospinning, and its physical properties, battery performances and the mechanism of how it improves the performance of high energy density lithium battery are studied. The MOF/PAN separator shows an outstanding thermal stability, an ultra-high electrolyte uptake (794±30%), a high ionic conductivity (2.83 mS cm −1 at 25 °C) and a wide electrochemical window (5.2 V vs. Li + /Li). The Li||separator||Li half-cell can operate stably for 1000 h at 5 mA cm −2 . A strong electrostatic interaction between MOF and PF 6 - in the electrolyte inhibits movement of the anions and enhances the Lithium-ion transference number ( t L i + ) up to 0.74, which is 64.4% higher than that of PAN separator. After 200 cycles at 0.2 C, the interfacial resistance between separator and electrode only increases from 22.00 to 30.58 Ω. The initial discharge capacity of the NCM811||10% MOF/PAN separator||Li battery system is 166.3 mAh g −1 with 81.3% capacity retention after 250 cycles at 5 C. This research offers an idea to design MOF-based composite separator that makes NCM811||Li battery outstanding in electrochemical stability and high rate performance.
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