INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Zexuan Liu,Mengting Chen,Yiqiao Lin,Weipeng Liu,Yiming Peng,Yingju Liu
In the electrolysis of water , the efficiency is heavily constrained by the slow kinetic process of the oxygen evolution reaction (OER) at the anode. Herein, by a simple hydrothermal method for the in-situ growth of Fe 3 (HHTP) 2 on the open three-dimensional nanostructured substrate, Co-anchored carbon nanotubes/carbon cloth (Co/CNT/CC), Fe 3 (HHTP) 2 @Co/CNT/CC was prepared and acted as an OER electrocatalyst . The combination of carbon nanotubes (CNTs) and carbon cloth not only enhanced the substrate conductivity, but also facilitated the uniform loading of Fe 3 (HHTP) 2 . The in-situ growth, on the other hand, allowed the Fe 3 (HHTP) 2 to connect with the conductive substrate tightly, thus enhancing the stability of the interfacial contact, improving the electron transfer efficiency and providing enough catalytically active sites. In addition, the construction of self-supported electrodes could effectively avoid the use of binders and improve the stability of the composites during electrolysis. The Fe 3 (HHTP) 2 @Co/CNT/CC displayed excellent properties in alkaline electrolytes as an efficient OER catalyst, achieving a current density of 50 mA cm −2 at an overpotential of only 1.60 V and perfect stability in long-term tests. Herein, the present work provides a rational tactics for developing self-supporting electrodes with plentiful active sites and high stability to enhance the electrochemical efficiency of water splitting.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jingjing Tang,Hongchao Li,Xuan Zhang,Jieshu Qian,Bingcai Pan
Fe-based metal–organic frameworks (MOFs) have garnered significant attention as catalysts for heterogeneous Fenton reactions, while the limited efficiency of the Fe(III)/Fe(II) redox cycle hinders their widespread use in wastewater treatment. Herein, we successfully incorporated carbon nanotubes (CNTs) into MIL-101(Fe) to modulate the coordination environment of Fe for achieving better catalytic activity. The MIL-101(Fe)/CNTs/H 2 O 2 system shows outstanding performance in degrading various pollutants, with the catalytic activity of the MIL-101(Fe)/CNTs composites (98.8%) significantly surpassing that of MIL-101(Fe) alone (26.4%) or CNTs alone (3.5%). Multiple experimental findings suggest that this synergistic effect is primarily attributed to the C-O-Fe bridge bonds resulting from the interaction of surface carboxyl groups on CNTs with Fe in MIL-101(Fe). This unique coordination structure accelerates the redox cycle of Fe(III)/Fe(II), thereby promoting the generation of hydroxyl radicals (HO • ). Furthermore, the MIL-101(Fe)/CNTs composites demonstrate excellent reusability and stability, maintaining effectiveness over a wide pH range from 3.0 to 6.5. This study provides new insights into regulating the microstructure of Fe-based MOFs to enhance their Fenton catalytic activity.
研究领域:
环境科学
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材料科学
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
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IF 7.46
Dongyan Hou,Yi You,Xiaohong Wu,Chen Li,Shan Wu,Cuiling Zhang,Yuezhong Xian
Fluoride ion (F − ) is an essential micronutrient in the human body, however, an abnormal large intake of F − can result in adverse effects, such as skeletal fluorosis or DNA damage. Therefore, it is of great significance to develop convenient assays for the visual detection of F − with high sensitivity. We rationally developed the nanosized iron-based metal organic frameworks (Fe-MOFs) by using 3,5-dicarboxybenzeneboronic acid as organic linkers and Fe 3+ as metal ions through the solvothermal method, which can be applied for detecting F − with high sensitivity and selectivity owing to the specific recognition of boronic acid groups towards F − and the strong binding affinity between F − and Fe 3+ . The Fe-MOFs possess excellent peroxidase-like activity, which can be effectively inhibited by F − . Moreover, a portable test kit for the determination of F − was developed by embedding Fe-MOFs into hydrogel, and the visual measurement of F − was realized based on smartphone by identifying the color signal of the oxidation of 3,3',5,5'-tetramethylbenzidine dihydrochloride. The output signal (R/G) was linear with F − concentration in the range of 10.0–200.0 μM. The Fe-MOFs-based colorimetric strategy is easy-operation, low-cost and equipment-free, which has been further applied to detect F − in the real water samples.
研究领域:
分析化学
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材料科学
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环境科学
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JOURNAL OF THE INDIAN CHEMICAL SOCIETY
·
2026
·Vol. 103
·期 5
·102557
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IF 3.4
Lei Liu,Fang Liu,Xinqian Ma,Jingyue Qian,Qiangshun Wu,Lina Wang,Liqiang Cui
Iron-based metal organic frameworks (Fe-MOFs) have been regarded as the ideal precursors for synthesis of iron-carbon micro-electrolysis (IC-ME) materials. However, their conventional autoclave-based fabrication limits large-scale application, and the potential of the resulting Fe@C composites derived from Fe-MOFs for Cr(VI) reduction remains underexplored. Herein, a facile stirring method conducted under ambient conditions was successfully developed. The evolution from Fe-MOFs to Fe@C was comprehensively characterized, and its reductive capacity for Cr(VI) was systematically evaluated. The effect of key experimental parameters including reaction time, initial pH value, electrolyte concentration, catalyst dosage, and environmental matrices on Cr(Ⅵ) removal were investigated in detail on the basis of the concentration variation of Fe ions released into water. The obtained results indicated that the rate of Cr(VI) removal-efficiency change (Δη/Δt) was positively corelated with that of Fe(II) concentration change (Δ C Fe(II) /Δ t) and 98.2% of Cr(VI) was removed within 60 min under the optimized conditions. According to the results of XPS with ion sputtering, Cr(VI) was removed via multiple pathways including adsorption, reduction and co-precipitation. This work not only offers a scalable route for MOFs-derived IC-ME materials, but also provides mechanistic insights into Cr(VI) removal from the perspective of Fe(II) dynamics.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Menghan Guo,Wenqing Wang,Jing Zhang,Pengfei Qi,Yifan Yan,Rui Wang
As a substitute for petroleum-based polymers, polylactic acid (PLA) always attracts great interest due to its unique eco-friendly properties and versatile applications. However, the inherent high flammability and slow natural degradation are still challenging for its wide usage. In this study, a multi-level sushi roll structured flame retardant (B@(D + E)@P-Fe) composed of boron nitride nanosheets (BNNS), iron metal-organic frameworks (Fe-MOFs), and phytic acid (PA) was synthesized through self-assembly technology and create a flame retardant PLA system. Loading of 6 wt % B@(D + E)@P-Fe enabled the PLA composites reached UL-94 V-0 rating and increased the LOI value up to 30 %. Cone calorimetry tests revealed that, compared with pure PLA, PLA composite exhibited a 32.6 % reduction in peak heat release rate and a 17.5 % reduction in total heat release. In addition, the composite material increased its crystallinity up to 51.2 % and maintained excellent mechanical properties with the modulus increasing from 2704.16 to 3448.52 MPa. Meanwhile, the as-synthesized flame retardant could be recycled with yield up to 81 %, and the purity of recovered lactic acid was 85.2 %, realizing a full life cycle of biodegradable PLA materials. This work presents a facile and eco-friendly strategy to fabricate renewable plastic with both good flame retardancy and high degradation efficiency.
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MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Fengjun Lv,Jinyi Chen,Shengxi Wu,Ran Sun,Lu Zhang,Yawen Luo,Hao Zhang,Doudou Xu
This study developed a stable, label-free AuNPs/Fe-MOFs/COOH-GO electrochemical immunosensor for the detection of Cytokeratin 19 fragment (CYFRA21-1), a critical biomarker for the early screening and diagnosis of non-small cell lung cancer (NSCLC). The nanocomposites of AuNPs/Fe-MOFs/COOH-GO was synthesized using a combination of hydrothermal synthesis, chemical reduction, and ultrasonic dispersion. AuNPs and COOH-GO components contributed high conductivity and a large specific surface area, which significantly enhanced the sensitivity of the sensor. The three-dimensional mesoporous structure of the Fe-MOFs further improved the stability of the immunosensor. Firstly, our novel nanocomposites was modified by using a glassy carbon electrode (GCE). CYFRA21-1 antibodies were then immobilized on the modified surface via interactions with thiol and carboxyl groups present on the nanomaterial. Bovine serum albumin (BSA) was employed to block non-specific binding sites. The constructed immunosensor exhibited a wide detection range for CYFRA21-1 from 1 pg mL −1 to 100,000 pg mL −1 , with a correlation coefficient (R 2 ) of 0.9989 in differential pulse voltammetry, and the limit of detection was defined as 0.35 pg mL −1 . The sensor also demonstrated high sensitivity, excellent specificity, good reproducibility, and remarkable stability, indicating its potent application potential for the early screening and diagnosis of NSCLC.
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BIOSENSORS & BIOELECTRONICS
·
2017
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IF 7.78
Zhiyong Tang,Junlin He,Jun Chen,Yazhen Niu,Yilin Zhao,Yuchan Zhang,Chao Yu
We are presenting an electrochemical immunosensor for the determination of Galectin-3 (Gal-3), a biomarker of heart failure. A glassy carbon electrode (GCE) was modified with a film of a composite made from the N-doped graphene nanoribbons immobilized Fe-based-Metal-organic frameworks deposited with Au nanoparticles (N-GNRs-Fe-MOFs@AuNPs). Primary antibody against Gal-3 (Gal-3-Ab 1 ) was immobilized on the Au nanoparticles on the surface of the modified GCE which then was blocked with bovine serum albumin . Signal amplification is crucial for obtaining low detection limits in biosensors. Here, a relatively simple and ultrasensitive sandwich-type electrochemical immunosensor based on novel signal generation and amplification was developed for the determination of Gal-3. A kind of novel redox-active species, AuPt-Methylene blue (MB) (AuPt-MB) nanocomposites , was synthesized by a one-pot method for the first time. Wherein, MB as a kind of the electron transfer mediators in an amperometric biosensor is responsible for electron production and signal amplification. The rod-like AuPt-MB nanohybrids displayed uniform morphology and good electrochemical activity and can combine with the second antibodies against Gal-3 (Gal-3-Ab 2 ). And the AuPt-MB-Ab 2 coupled with the N-GNRs-Fe-MOFs@AuNPs-Ab 1 to form the sandwich type format that can greatly enhance the biosensor's sensitivity. Under optimal conditions, the designed immunosensor exhibited a linear concentration range from 100 fg mL −1 to 50 ng mL −1 , with a low detection limit of 33.33 fg mL −1 (S/N = 3) for Gal-3 in spiked serum. Additionally, the designed immunosensor showed acceptable selectivity, reproducibility and stability. The satisfactory results in analyzing human serum samples indicated potential application promising in monitoring biomarkers.
研究领域:
生物医学工程
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分析化学
·
纳米技术
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Ying Huang,Xiangrong Liu,Tiantian Shen,Wang Li,Jiali Ren,Haiyan Zhong
The detection techniques for glyphosate residues have garnered attention due to the potential toxicity associated. Herein, we introduced a fluorescent “turn-on” strategy, leveraging competitive coordination with iron, for glyphosate detection. We synthesized iron-based metal-organic frameworks (Fe-MOFs) at room temperature. Among them, 2,5-dihydroxyterephthalic acid (DOBDC) acted as a ligand to produce strong fluorescence, and iron ions acted as a quencher to quench the fluorescence of DOBDC. Another ligand, 2-nitroterephthalic acid, contained nitro quenching of the fluorescence, giving it a lower background. Glyphosate competed with the ligands for ions, weakening the interaction between ions and the ligands. This disruption restored the fluorescence emission at 535 nm, enabling glyphosate detection. To facilitate field application, Fe-MOFs were encapsulated within agarose to create a functional hydrogel. Glyphosate penetrated the hydrogel and resulting in fluorescence “turn-on”. Remarkably, this method facilitated visual detection through smartphone photography coupled with RGB (red/green/blue) analysis, offering a user-friendly and portable solution.
研究领域:
环境科学
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分析化学
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材料科学
·
传感器和检测技术
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FOOD CHEMISTRY
·
2026
·
IF 9.8
Qianyi Li,Zuopeng Li,Zhangmin Li,Chang-qing Miao,Bowen Zhu,Sanbing Zhang
This study presents a novel method using a gold-inlaid iron-based nanoenzyme (Au@MIL-53(Fe)) to rapidly detect phoxim, a neurotoxic organophosphate pesticide, in animal feed. The porous structure of MIL-53(Fe) acts as small-molecular ionic isolation lattices (SMILES), creating a solid-matrix surface confinement induced fluorescence enhancement (SSCIFE) environment for gold nanoclusters (AuNCs), enabling stable fluorescence at 642 nm and 435 nm. Additionally, it catalyzes TMB oxidation by hydrogen peroxide for colorimetric detection. Ascorbic acid 2-phosphate (AAP) is hydrolyzed by acid phosphatase (ACP) to ascorbic acid (AA), altering fluorescence and color signals. Phoxim inhibits ACP, modulating these signals and restoring the TMB color shift. The detection limits are 1.10 ng/mL (fluorescence), 1.02 ng/mL (colorimetry), and 1.04 ng/mL (smartphone colorimetric platform), respectively. The recovery rate of this method in feed is 84% ~ 116%. It offers a rapid, sensitive, and reliable solution for pesticide monitoring and food safety assurance.
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CHEMOSPHERE
·
2024
·
IF 8.1
Jie Zhang,Xufei Wang,Yiwei Liu,Tao Jin,Liang Liu,Xiaodong Ma,Gengbo Ren
The efficiency and stability of the electrical activation of persulfate (PS) by transition metal-based cathode are controlled by the cycling of Fe(III)/Fe(II) and the mass transfer of PS. In this study, the mixed-valence MOFs catalyst (Fe II -MIL-53(Fe)) modified flow-through cathode was prepared for the first time. Fe II -MIL-53(Fe) was prepared by replacing part of the iron-oxygen network structure in MIL-53(Fe) with Fe(II), resulting in the formation of coordinated unsaturated iron centers (CUICs). The increase of the Fe(III) CUICs facilitated the conversion of Fe(III) to Fe(II). Furthermore, the cycling of Fe(III)/Fe(II) was further promoted by the electric field. Meanwhile, the hydrodynamic behavior of flow-through cathode was indicated by the computational fluid dynamics (CFD) simulation. The quenching experiments and electron paramagnetic resonance (EPR) results showed that several reactive specie (SO 4 ·- , ·OH, O 2 ·- and 1 O 2 ) were produce. In summary, this work provided an effective strategy for the efficient and stable electrical activation of PDS.
研究领域:
环境科学
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化学工程
·
材料科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yukai Huang,Haoyang Zhong,Tong Zou,Bin Zhang,Linlin Yu,Wenyu Wang,Shijie Zhang,Ruoyu Chen,Qian Jia
In this work, a superhydrophobic magnetic photothermal flame-retardant polyurethane sponge (AH/Fe-MOF-P@Fe 3 O 4 @PA@PU) with efficient oil–water separation performance was prepared. After coating the polyurethane sponge with a phytic acid (PA) film, the new honeycomb-like “three-in-one” flame-retardant AH/Fe-MOF-P and magnetic nanoparticle Fe 3 O 4 were firmly bound to the sponge by polydimethylsiloxane (PDMS). AH/Fe-MOF-P@Fe 3 O 4 @PA@PU exhibited excellent superhydrophobicity (with a water contact angle of 155.3°), an oil–water separation efficiency of up to 99%, outstanding recyclability, and environmental stability. Utilizing its magnetic properties, it can be applied to special and complex oil spill treatments. The AH/Fe-MOF-P@Fe 3 O 4 @PA@PU composite exhibited exceptional photothermal properties and demonstrated highly efficient adsorption capabilities for high-viscosity crude oil. Furthermore, the modified sponge possessed remarkable flame-retardant properties, exhibiting the ability to self-extinguish within 2 s following ignition. The superhydrophobic magnetic flame-retardant polyurethane sponge has great potential as an effective oil spill remediation material.
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