EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2013
·Vol. 2014
·期 2
·345-351
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IF 3.12
Mei-Lin Wei,Jing-Jing Sun,Xian-Ying Duan
Graphical A 3D metal–Schiff-base–POM-MOF has been constructed by combining in situ two traditional building blocks, a metal–Schiff-base and POM-MOF, and its structure was determined by single-crystal X-ray diffraction. Due to the bonding of H 2 O to otherwise open coordination sites on Cu 2+ ions, it shows good proton conductivities of 10 –5 –10 –4 S cm –1 in the temperature range of 25–100 °C under 98 % RH. A metal–Schiff-base–POM-MOF, {[Cu 3 (L) 2 (H 2 O) 4 ] [Cu(dmf) 4 (SiW 12 O 40 )] · 9H 2 O} n {L = N , N′ -bis[(2-hydroxy-3-methoxyphenyl)methylidene]hydrazine hydrate}, has been synthesized in situ from [SiW 12 O 40 ] 4– , Cu 2+ and L in an H 2 O/dmf/CH 3 OH/CH 3 CN mixture at room temperature, and the product was characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction analysis. X-ray diffraction analysis revealed that the title complex presents a 3D network constructed from Cu II –Schiff-base cations, 1D POM-MOF chains and solvent water molecules. Its water vapour adsorption isotherm at room temperature and pressure shows that the water vapour adsorbed by the complex is 51.67 cm 3 g –1 at the maximum allowable humidity, which corresponds to 7.1 water molecules per unit formula. In addition, it exhibits good proton conductivity (>10 –4 S cm –1 ) at 100 °C in the relative humidity range 35–98 %. The corresponding activation energy ( E a ) of conductivity was estimated to be 0.32 eV.
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TALANTA
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2015
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IF 3.545
Xianying Wang,Chunhui Deng
In this work, a simple method for the extraction and analysis of bisphenols in environmental samples was presented. And the prepared zirconium-based magnetic MOFs (magG@PDA@Zr-MOF) were used as the sorbents for the magnetic solid-phase extraction. With the simple solvothermal reaction and sol–gel method, the prepared material showed great characteristics of large surface area, homogeneous pore size, good magnetic responsivity and super-hydrophilicity. The large surface area provided abundant sites to extract target compounds; the magnetic property could simplify the whole extraction procedure; and the hydrophilicity improved the dispersibility of the material in matrix. Here, various extraction parameters were optimized, including amounts of sorbents, adsorption time, species of elution solvents and desorption time. The whole extraction procedure could be accomplished in 30 min. And under the optimized conditions, method validations were also studied, such as linearity, the limit of detection and recovery. Finally, the prepared material was used in real water samples. The results showed this material had good potential as the sorbent for the extraction of targets in environmental water samples.
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APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Xuemin Sun,Ge Gao,Dongwei Yan,Chuanqi Feng
The Fe 3 O 4 @MOF composite with a microspheric core and a porous metal-organic framework (MOF HKUST-1) shell has been successfully synthesized utilizing a versatile Layer-by-Layer (LBL) assembly method. The structure was identified by X-ray diffraction (XRD), and the morphology was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The Fe 3 O 4 @MOF composite exhibited outstanding electrochemical properties when it was used as an anode material for lithium ion batteries (LIBs). After 100 discharge-charge cycles at a current density of 100 mA g −1 , the reversible capacity of Fe 3 O 4 @MOF could maintain ∼1002 mAh g −1 , which was much higher than that of the bare Fe 3 O 4 counterpart (696 mAh g −1 ). Moreover, load the current density as high as 2 A g −1 (after 70 cycles at the current density step increased from 0.1 to 2 A g −1 ), it still delivered a reversible capacity of ∼429 mAh g −1 . The results demonstrate that the cycling stability of Fe 3 O 4 as an anode could be significantly improved by coating Cu 3 (1,3,5-benzenetricarboxylate) 2 (HKUST-1). This strategy may offer new route to prepare other composite materials using different particles and suitable Metal-organic frameworks (MOFs) for LIBs application.
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INORGANIC CHEMISTRY
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2017
·
IF 4.857
Zhujun Zhang,Shiliang Zhang,Qilu Yao,Xiangshu Chen,Zhang-Hui Lu
The catalytic dehydrogenation of hydrazine borane (N2H4BH3) and hydrous hydrazine (N2H4·H2O) for H2 evolution is considered as two of the pivotal reactions for the implementation of the hydrogen-based economy. A reduction rate controlled strategy is successfully applied for the encapsulating of uniform tiny NiPt alloy nanoclusters within the opening porous channels of MOFs in this work. The resultant Ni0.9Pt0.1/MOF core–shell composite with a low Pt content exerted exceedingly high activity and durability for complete H2 evolution (100% hydrogen selectivity) from alkaline N2H4BH3 and N2H4·H2O solution. The features of small NiPt alloy NPs, strong synergistic effect between NiPt alloy NPs and the MOF, and open pore structure for freely mass transfer made NiPt/MIL-101 an excellent catalyst for highly efficient H2 evolution from N2H4BH3 or N2H4·H2O.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Fei Li,Zhuonan Huang,Yuqi Wang,Le Wu,Sinan Guan,Yue Wang,Ying Liu,Shuang Cheng,Jinlei Wu,Jun Hu,Xin Ding
Magnesium hydride (MgH 2 ) has garnered substantial consideration mainly due to its high gravimetric density and reliable resource, whereas its poor thermodynamics and kinetics for absorbing/releasing hydrogen restricts the largescale application. Certain catalysts have demonstrated remarkable activity in enhancing the hydrogen storage capabilities of MgH 2 . In this work, the nanoparticle-cumulated flower-like CoFe@C coated catalysts (denoted as CoFe@C) are controllably synthesized as expected by the MOF (Metal-Organic Farmwork) in-suit decomposition method at 800 °C, which exhibits an average pore size of 18.63 nm. Meanwhile, the particle size for the as-prepared CoFe alloy coated in carbon layer are approximately 10–20 nm, and the as-prepared samples are introduced to promote the de/rehydrogenation properties of MgH 2 at relatively lower temperatures. Due to the synergistic interaction of CoFe alloy nanoparticles serving as active sites and agglomeration resistance of carbon layers, the MgH 2 composites doped with CoFe@C-800 could initialize its decomposition process at 175.9 °C, and may desorb 6.0 wt% H 2 at 300 °C in 400 s. Additionally, the peak temperature and apparent activation energy during dehydrogenation decline significantly (with 35 % and 38 %, respectively). Furthermore, theoretical analysis results indicate a higher catalytic activity for the carbon-coated CoFe alloy owing to the synergetic effect between CoFe nanocomposite & carbon layer, which can facilitate the bond extension and strength decrease of Mg-H bonding. In brief, using MOF may derive transition metal and carbon layer, which could be a promising approach to stimulating the hydrogen storage properties of MgH 2 .
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FOOD CHEMISTRY
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2025
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IF 9.8
Huayue Sun,Huining Chai,Zhishuang Yuan,Kun Yu,Lijun Qu,Xueji Zhang,Guangyao Zhang
The detection of alkaline phosphatase (ALP) in milk is crucial for determining the safety of dairy products, but single mode detection may result in false positives or false negatives. This work presents a dual-mode visual fluorescent/colorimetric ratio sensor for highly sensitive detection of ALP. Zinc meso-tetra(4-carboxyphenyl) porphyrin (ZnTCPP) metal–organic frameworks (MOFs) were grown on polyacrylonitrile with Al 2 O 3 layers (Al-ZnTCPP@PAN). It exhibited enhanced photoresponsive oxidase-like activity, catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) to amplify the colorimetric signal. ALP hydrolyzes l -Ascorbic acid 2-phosphate sesquimagnesium salt hydrate (AA2P) to produce phosphate ions (PO 4 3− ), which attack the Al node of Al-ZnTCPP@PAN and cause ZnTCPP to detach from the material surface. It results in weakened colorimetric signals of Al-ZnTCPP@PAN and enhanced fluorescent signals of the reaction solution. A smartphone-integrated platform enabled dual-mode visual fluorescent/colorimetric ratio detection of ALP with the limit of detection as low as 0.039 mU/mL, successfully applied to milk, highlighting its potential in food safety.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Shihao Zhu,Zixian Wu,Xinhang Cong,Jing Cuan,You Zhou
In this work, dual-responsive luminescent Her@Zn-Bim hybrids are developed by herniarin (Her) dye encapsulation engineering within a layered host MOF (Zn-Bim). The pore confinement effect of the Zn-Bim host effectively isolates the guest dye molecules, therefore affording bright blue dye emission for Her@Zn-Bim hybrids. Upon exposure to tetracycline antibiotics (TCs), the hybrid undergoes a significant quenching of the blue emission, concurrent with the appearance of a distinct green emission. This dual-emission response is very fast and sensitive, facilitating real-time ratiometric detection of TCs with a low limit of detection of 7.81 nM. Notably, the ratiometric luminescence response manifests as a readily observable blue-to-green color switching, enabling straightforward and colorimetric visualization of TCs. Visual and semiquantitative monitoring of TCs is achieved using a readily available smartphone installed with a color-analysis app. Furthermore, in conjunction with principal component analysis, the Her@Zn-Bim hybrids demonstrate efficient discrimination of four TCs with high structural and chemical similarities, even in complex mixture systems. The mechanisms underlying the luminescent responses of the hybrids towards TCs are carefully elucidated. These hybrid sensors, featuring high sensitivity, fast response, colorimetric visualization, and precise discrimination capability, hold promising potential for practical applications in sensing TCs.
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TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2024
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IF 4.7
Yi ZHANG,Han-xiao LIAO,Lu YANG,Bin-hua ZHOU,Xuan-zhi LIU,Huan-huan ZHAI,Xiao-rong HE,Hong-jun HUANG,Peng-fei TAN,Jun PAN
In order to address the issue that the photocatalytic reduction of hexavalent chromium (Cr(VI)) is often limited by the inefficient utilization of electrons in photocatalysts, a quasi-MOF photocatalyst using thiocyanate (—SCN) was developed as a modulator to enhance the charge transfer properties of ZIF-L-based photocatalysts. The incorporation of —SCN introduced structural defects, which improved visible light absorption and the reduction ability of photogenerated electrons. —SCN significantly adjusted the electronic properties and established a stable electron release pathway, serving as active sites for reduction. The optimized quasi-MOF demonstrated a Cr(VI) reduction rate of 94.8% in neutral potassium thiocyanate solution under visible light without a hole scavenger. The reaction rate constant is 2.8 times that of the photocatalyst without defect modulation. This study offers a promising strategy for developing highly efficient photocatalysts for environmental remediation.
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ANALYTICA CHIMICA ACTA
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2024
·
IF 5.7
Kexi Sun,Chao Liu,Yi Cao,Jianxia Zhu,Jialin Li,Qing Huang
Background Rapid and accurate detection of glutathione content in human blood plays an important role in real-time tracking of related diseases. Currently, surface-enhanced Raman scattering/spectroscopy (SERS) combined with nanozyme material has been proven to have excellent properties in the detection applications compared to many other methods because of it combines the advantages of trace detection capability of SERS and efficient catalytic activity of nanozymes. However, there are still existing problems in real sample detection, and to achieve quantitative detection is still challenging. Results In this study, gold nanoparticles (AuNPs) were synthesized in situ on the surface of two-dimensional Cu-porphyrin metal-organic framework (MOF) nanosheets to produce the AuNPs@Cu-porphyrin MOF nanozyme, which exhibited both oxidase-like activity and SERS detection ability. On one hand, the intrinsic oxidase-like activity of the nanozyme could be inhibited due to the chelation of glutathione (GSH) and Cu, which thus led to the visual color change of the solution. On the other hand, the abundant Raman “hot spots” at the nanogap generated by Au NPs and the internal standard (IS) signal provided by Cu- meso -tetra (4-carboxyphenyl) porphine (Cu-TCPP) MOF improved the sensitivity and quantitative accuracy of detection. Significance and novelty A dual-mode signal output sensor based on the nanozyme was thus established, which could be used in the trace detection of GSH. Such a dual-mode sensor possesses excellent detection performance, with the advantage of both wide detection range from 1 to 300 μM in the colorimetric detection mode and high sensitivity with LOD of 5 nM in the SERS detection mode, and can be applied to GSH detection in actual serum samples with reliable results.
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TALANTA
·
2025
·
IF 6.1
Yingfei Hui,Hao Guo,Mingyue Wang,Liping Peng,Borong Ren,Yanyan Ma,Wu Yang
Glutathione (GSH) levels have been linked to aging and the pathogenesis of various diseases, highlighting the necessity for the development of sensitive analytical methods for GSH to facilitate disease diagnosis and treatment. In this study, we synthesized a novel core-shell material, UiO@TBTA, by in-situ growing TFPB-TAPA COF on UiO-66-NH 2 through a Schiff base reaction. The resulting composite capitalize on the advantages of both materials, demonstrating excellent stability, large specific surface area, and abundant active functional groups while preserving superior crystallinity. Notably, this strategy effectively reduces the occurrence of aggregation-caused quenching (ACQ) in COFs. Due to the inner filter effect and hydrogen bonding interactions between UiO@TBTA and GSH, a specific ratiometric fluorescence detection of GSH was achieved in the range of 0.1–7 μM, with a limit of detection (LOD) of 0.0685 μM. In addition, due to the sensitive color change of the sensing material from orange to black caused by GSH, a proportional colorimetric sensing strategy has also been proposed, enabling the detection of GSH within the range of 1–200 μM. What's more, two intelligent artificial neural networks models were constructed with the help of machine learning that can quickly, accurately, and sensitively determine the concentration of GSH based on fluorescence images and color photographs respectively. Our work represents the first study utilizing MOF@COF composite for the multimodal detection of GSH, thus providing a novel strategy for the multimodal detection of the target analyte. Prospectively, the construction of the fluorescence/colorimetric dual-mode intelligent ratiometric sensing platform using deep machine learning holds great promise for real-time monitoring.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Youwei Cheng,Lian Zhu,Yaqiong Gong
Metal-organic frameworks (MOFs) are widely recognized as precursors or sacrificial templates for the synthesis of target catalysts on account of their high porosity and high active surface area . Elemental doping strategy is considered as an effective method for the synthesis of efficient and stable catalysts for electrolytic water. Therefore, in this paper, Ce-doped Ni(OH) 2 nanoparticles and Ni-MOF nanosheets composites were synthesized by electrodeposition using Ni-MOF as precursor. Catalyst Ce–Ni(OH) 2 @Ni-MOF/NF displays excellent OER performance, requiring only 193 mV and 279 mV overpotentials to realize current densities of 10 mA cm −2 and 100 mA cm −2 , respectively, while the UOR performance was very remarkable, only a potential of 1.28 V was demanded to reach a current density of 10 mA cm −2 . In addition, no obvious change in the overpotential was noticed during the stability test of 16 h, indicating good stability of Ce–Ni(OH) 2 @Ni-MOF/NF. This study provides a meaningful reference for the design of an efficient and stable environmental friendly electrocatalyst .
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ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Ping-Yue Wang,Xin-Xin Chen,Xing Zhou,Xiao-Yi Xu,Zhi-Qiang Li,Mei-Rong Zhang,Xiao-Hui Yao,Jun Wang,Wei-Guo Zhao,Dong-Yang Zhang,Tao Chen
Enzyme catalysis applications are limited because of their poor stability under extreme conditions. Using metal–organic frameworks (MOFs) as enzyme immobilization carriers efficiently solves this problem. However, MOFs easily agglomerate, are difficult to recover as a crystalline powder, and can only be used under continuous stirring, resulting in low reaction efficiencies. The use of immobilized enzymes for continuous fluid catalysis to improve catalytic efficiency remains challenging. At the same time, the spatial division of most immobilized enzyme porous materials is disordered, which leads to poor mass transfer efficiency and consequently low reaction rates. In this context, we want to construct a new type of reactor that solves the problem of enzyme stability by encapsulating enzymes in MOFs and then using low-cost and easily available silk fabric materials as immobilized carriers to load MOF immobilized enzymes. The ordered structure of silk fabric enhances substrate mass transfer, thereby improving the catalytic efficiency of the reactor. By comparing the mass transfer of a continuous fluid catalytic reactor with ordered silk fiber immobilized enzyme (OSCR) with that of a continuous fluid catalytic reactor with disordered silk fiber immobilized enzyme (DSCR) using crystal violet adsorption and catalytic process simulations, we demonstrated that the reaction efficiency in ordered spaces can be improved through mass transfer within each partition space. Finally, the reactor was used in the biotransformation of polydatin and demonstrated a high conversion of 98%, which was much higher than that of DSCR. This study revealed the enormous potential of ordered structure enzyme reactors in continuous fluid catalysis.
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