Journal of Materials Chemistry A
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2025
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IF 9.5
Chen Li,Chuncai Zhou,David French,Ian T. Graham,Zixuan Wang,Yunfei Li,Feng Wang,Guijian Liu
As strategic emerging industries represented by clean energy technologies develop rapidly, gallium (Ga), one of the critical elements due to its use in these technologies and limited supply, has attracted worldwide attention. The discovery of appropriate materials to adsorb Ga is crucial for improving the utilization of Ga resources. With the goal to recover Ga ions more efficiently and selectively, carbon nanotubes (CNTs) and amino-functionalized MIL-53 series metal–organic skeletons were hydrothermally synthesized into CNT/NH2-MIL-53(Fe) composite adsorbents. The composite's morphology, structure, chemistry and other physicochemical features were characterized, and the adsorption conditions including pH, initial Ga concentration, along with adsorbent dosage were optimized. The outcomes suggest that 2-CNT/NH2-MIL-53(Fe) performs better than the unmodified material in adsorption, and the theoretical maximum adsorption amount of Ga is 1483.8 mg g−1. The adsorption exhibited a single layer chemisorption with an endothermic spontaneous reaction. The adsorption mechanism for Ga onto 2-CNT/NH2-MIL-53(Fe) was mainly via ion exchange and chelation, accompanied by hydrogen bond interaction. The outstanding adsorption capacity and reproducibility using CNT/NH2-MIL-53(Fe) composites provide a novel method for adsorbing Ga from aqueous solutions.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xiaodong Chen,Wanting Dai,Chengli Luo,Runqing Guo,Guilong Peng,Shiqiang Wei,Zhenmao Jiang
s Single-atom Fe catalysts are attractive for antibiotic removal via peroxymonosulfate (PMS) activation, with support design being crucial. The metal triazolate framework (hereafter MET) serves as an ideal template due to extremely high theoretical nitrogen content; however, the changes in physicochemical properties and reaction mechanisms during its thermal activation remain unclear. In this work, Fe@C-X catalysts were synthesized by pyrolyzing Fe@MET-6. Characterization revealed that the material features Fe N 4 coordination structure and “bubble-like” hierarchical pores formed during pyrolysis play a key role in enhancing catalytic performance. These structures not only increase specific surface area and pore volume, but also anchor dense Fe N 4 sites and facilitate efficient electron transfer. Consequently, Fe@C-700/800 exhibited rate constants of 0.1152 and 0.2766 min −1 for LEV degradation, respectively, an order of magnitude higher than Fe@C-600 (0.0105 min −1 ). Mechanistic studies indicated that the “bubble”, induced structural optimization governs the PMS activation pathway: the Fe@C-600/PMS system relies on a singlet oxygen ( 1 O 2 ) mechanism, while Fe@C-700/800 with developed conductive networks follow an electron-transfer-dominated route. Additionally, the Fe@C-700 with high LEV degradation and energy-efficiency demonstrated excellent recyclability, strong potential for practical applications and reduced toxicity of degradation intermediates. This study provides new insights into designing efficient single-atom catalysts by regulating MOF-derived architectures.
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ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Mingzhi Zhang,Shujuan Wang,Hongwei Guo,Fan Lv,Tianjiao Ling,Yi Cao,Hongwei Li,Huihua Wang,Jinxin Chen,Ruiqi Guo
Self-supported electrodes featuring transition metals encapsulated within carbon nanotubes (CNTs) are promising bifunctional catalytic electrodes for overall water splitting due to their binder-free fabrication (eliminating costly Nafion), high electrical conductivity, mechanical strength, and low cost. However, challenges remain, including insufficient catalytic activity and stability, as well as underutilization of the CNTs’ functionality. Herein, we strategically modified a Fe-based self-supported electrode with ultrafine IrOx nanoclusters (IrOx NCs), creating Fe@CNTs/IrOx NCs/CC, which exhibits enhanced bifunctional performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH. The optimized Fe10@CNTs/IrOx NCs/CC requires low HER and OER overpotentials of 36.7 mV and 203.5 mV at the current density of ± 10 mA cm–2. It also shows a high mass activity of 214.8 A gIr–1 at 100 mV. Moreover, water splitting cells employing Fe10@CNTs/IrOx NCs/CC as both the anode and cathode require only 1.50 V to reach 10 mA cm–2 and demonstrate stable operation exceeding 100 h. Detailed theoretical calculations prove that the IrOx NCs synergistically enhance HER kinetics by promoting both the H2O adsorption-dissociation efficiency and optimized *H desorption. For the OER process, they significantly lower the energy barrier of the rate-determining step (*O → *OOH), thereby accelerating the overall water splitting process of Fe10@CNTs/IrOx NCs/CC. This work highlights an innovative research route for boosting the water splitting performance through targeted modification of the self-supported electrode.
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APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Xiao-ru Meng,Pei-dong Wu,Shuai Gao,Zhen Fang
Oxygen reduction catalyst (Fe/Fe 3 N/C) with Fe/Fe 3 N encapsulated carbon active sites were synthesized by coated Fe , N layer onto cellulose-derived carbon through the coordination of iron (Fe 3+ ) and formamide solution with cellulose and subsequent carbonization to enhance electrical conductivity of biochar surfaces as cathode in fuel cells. Fe/Fe 3 N/C catalyst exhibited a half-wave potential of 0.74 V vs . reversible hydrogen electrode in 0.5 M H 2 SO 4 with excellent stability over 100 h. Electrochemical impedance spectroscopy tests showed that the charge transfer resistance was only 1.671 Ω using this novel method, indicating that the cellulose-derived carbon in the core significantly enhanced the electron transport efficiency. Quantum mechanical calculations confirmed strong coordination interaction between the carbonyl groups in formamide and the hydroxyl groups in cellulose with Fe to form Fe/Fe 3 N structure by carbonization. This study provides an effective renewable material solution for Proton exchange membrane fuel cells.
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Materials Today Chemistry
·
2025
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IF 6.7
Shasha He,Huirou Zhou,Hongjian Chen,Xinglin Qin,Rahim Rahimi,Hongjie Jiang
Nitrite is a common harmful ion found in water and food, and its excessive intake poses significant risks to human health. Accordingly, devising a detection strategy for nitrite that is fast, highly responsive, durable, and ecologically sustainable holds significant importance. In this study, a surface-modified Fe/Cu bimetal-doped Co 3 O 4 catalyst was successfully synthesized, and its 1 wt% aqueous dispersion was drop-cast onto carbon cloth (CC) to fabricate a binder-free flexible electrode (KH792@(C)Fe/Cu–Co 3 O 4 CC) for electrochemical sensing of nitrite. This electrode demonstrated remarkable electrocatalytic activity toward NO 2 − in phosphate buffer solution (0.1 M PBS, pH 7.4), offering a broad linear detection range (6.65 μM–5.0 mM), an exceptionally rapid response time (0.1 s), as well as a low detection limit of 6.65 μM, demonstrating both its high sensitivity and practical applicability. This enhanced performance is largely credited to the cooperative effect between KH792 functional organic units and the Fe/Cu–Co 3 O 4 composite oxide framework. On one hand, the introduction of organic molecules enhances the electrode's electron transfer capability and surface hydrophilicity. On the other hand, the dual-metal doping induces a high density of surface defects and oxygen vacancies, enhancing the density of active sites and facilitating both the adsorption and electron transport processes of nitrite. Moreover, the catalyst was successfully applied to commercial disposable screen-printed electrodes, which were compatible with portable electrochemical workstations, underscoring its potential for low-cost and on-site nitrite detection.
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ENVIRONMENTAL RESEARCH
·
2025
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IF 7.7
Han Zheng,Haotian Guo,Peng Dai,Jiaquan Zhang,Dongliang Wang,Muhammad Faheem,Ziguo Liu,Min Tao,Ping Song,Ying Huang
Valorizing waste vinasse into Fe-doped multifunctional biochar offers an efficient route to boost peroxymonosulfate (PMS) activation and improve wastewater purification. In this study, a magnetic porous Fe-doped vinasse biochar (FVB 700 ) was synthesized via co-pyrolysis of vinasse and ferrous oxalate. The obtained material exhibited a synergistic effect between adsorption and PMS catalytic activation for efficient bisphenol A (BPA) removal. Specifically, FVB 700 , with primary iron species (Fe 0 , Fe 3 C, and Fe 3 O 4 ), rapidly adsorbed BPA through monolayer chemisorption, and the adsorbed BPA was subsequently degraded via PMS activation. Quenching experiments and EPR analysis identified singlet oxygen ( 1 O 2 ) as the dominant nonradical species responsible for BPA degradation in the FVB 700 /PMS system. Density functional theory analysis revealed Fe 3 C as the main catalytic center, anchoring PMS via its terminal -SO 4 oxygen and reacting with another adsorbed HSO 5 − to generate 1 O 2 . The FVB 700 /PMS system retained high performance across a wide pH range (4-11), resisted common water matrix interferents (Cl − , NO 3 − , HCO 3 − , H 2 PO 4 − , and humic acid), and achieved 78.9 %-90.2 % BPA removal in actual water bodies (tap water, groundwater, and pharmaceutical wastewater). Moreover, in a continuous-flow fixed-bed reactor, it maintained over 90 % BPA removal for 8 days, underscoring its long-term stability and practical applicability. Degradation pathway analysis and ECOSAR prediction showed detoxification of BPA into low-hazard intermediates. This study presents an eco-friendly, “waste-to-resource” strategy that integrates Fe-doping with an adsorption-oxidation synergy for the sustainable and efficient remediation of organic contaminants in water.
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Nanoscale
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2025
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IF 5.1
Junhao Hu,Mengzhu Liu,Yuqi Zhai,Yongpeng Wang
C nanofibers dotted with square Fe@C crystals derived from metal–organic frameworks (MOFs) with a novel 3D hierarchical architecture were successfully prepared through electrospinning, hydrothermal processing, and high-temperature pyrolysis. The introduction of carbon nanofibers endowed the particles with directional action and mechanical support, inhibiting local agglomeration and the collapse of the Fe@C crystals. The unique overall 3D porous structure with micro-concavities on its surface provided sufficient paths for electromagnetic wave transmission, abundant heterostructured interfaces for interfacial polarization and a connected network for conductive loss. The appropriate combination of the magnetic Fe@C crystals with dielectric carbon nanofibers optimized the impedance matching. Benefitting from the ingenious design, the composites exhibited excellent electromagnetic wave absorption (EWA) performances. FC1–30 was found to exhibit a minimum reflection loss (RLmin) of −28.09 dB at a thickness of 5.5 mm and a widest effective absorption bandwidth (EAB) of 1.1 GHz at a thickness of 2.5 mm. FC1–10 showed a RLmin of −20.82 dB at a thickness of 3.0 mm and a broadest EAB of 3.8 GHz at a thickness of only 1.5 mm. The preparation process was optimized, and the influence of the filler loading ratio on EWA performance was investigated. The EWA mechanism has been discussed in detail. The study provides an opportunity for the development of advanced electromagnetic devices with integrated structure and function.
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ACS Applied Nano Materials
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2025
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IF 5.5
Yue Cao,Xin Zhang,Bo Ren,Xiaodong Yang
Due to the complex physiological and pathological barriers in tumor tissues, the penetration depth of light is limited and the accumulation and distribution of photosensitizers in the tumor are insufficient, which seriously affects the therapeutic effect of photothermal therapy (PTT) on solid tumors. The preparation process of traditional photothermal agents is complicated, and their biosafety needs further improvement. Moreover, photothermal agents are difficult to rapidly excrete from the body after realizing the therapeutic function, which may cause long-term potential harm to the body. In this study, multifunctional nanoparticles (FeCNPs) consisting of iron(III), curcumin, and poly(ethylene glycol) grafted polyglutamate (PLG-g-mPEG) were obtained through a simple one-pot method. The synthesized FeCNPs exhibited an average hydrodynamic size of 125 nm and a polydispersion index (PDI) of 0.462. Furthermore, the nanoparticle has excellent biocompatibility and a photothermal effect. After the PPT, the FeCNPs break down into harmless elements via a dynamic disassembly mechanism triggered by deferoxamine mesylate (DFO), facilitating swift elimination and preventing possible long-term toxicity to major organs. The therapeutic synergies enable efficient tumor removal. In summary, this study demonstrates an approach for the dynamic disassembly of metal-polyphenol nanoparticles, effectively addressing the challenge of balancing the EPR effect and renal clearance.
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FOOD CHEMISTRY
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2025
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IF 9.8
An-qi Tang,Xuechao Xu,Cao-wei Chen,Mengyuan Tan,Lu Gao,Zhen-quan Yang
Enterobacter hormaechei , A zoonotic pathogen with escalating prevalence in global food sources, severely jeopardizes food safety, necessitating the development of high-performance detection methods. Herein, a novel colorimetric detection strategy integrating phages and nanozymes was proposed for foodborne E. hormaechei . Initially, four homologous phages (EhpYZU05, EhpYZU08, EhpYZU9–1 and EhpYZU10), which were isolated using E. hormaechei YZU05 as the host bacterium, were modified on the surface of NH 2 -MIL-88B(Fe) to fabricate four phage@NH 2 -MIL-88B(Fe) nanozymes. These nanozymes exhibit peroxidase-like activity, catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) chromogenic reaction in presence of H 2 O 2 . With introduction of multiple host or non-host E. hormaechei strains, TMB chromogenic reaction catalyzed by phage@NH 2 -MIL-88B(Fe) nanozymes can be specifically inhibited. This inhibition occurs due to the specific phage adsorption of phage@NH 2 -MIL-88B(Fe) nanozymes towards these host or non-host E. hormaechei strains, indirectly blocking their catalytic sites. Leveraging this principle, colorimetric broad-spectrum detection of E. hormaechei was achieved. Additionally, this method demonstrated reliable recoveries (96.7 % ~ 103.3 %) when applied to detect real food matrices, highlighting its high reliability in practical scenarios. This approach not only clarifies the intrinsic mechanism of phage-modified nanozymes for target bacteria detection but also provides a robust and reliable method for early pathogen detection, thereby significantly contributing to food safety enhancement
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 12
·1-9
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IF 6.232
Zhao Yunfei,Chen Jun,Zhong Hangtian,Zhang Chengli,Zhou Yuan,Mao Weiran,Yu Chao
The development of a novel signal amplification system is described for sensitive determination of α2,6-sialylated glycans (α2,6-sial-Gs), an important prognostic tumor biomarker. First, Fe-based metal-organic frameworks (Fe-MOFs) with silver nanoparticles (AgNPs) decorated onto the outer surface were designed and synthesized with controlled octahedron structures. The new Ag/Fe-MOFs nanocomposite possessed strong conductivity and a large surface area to carry more nanoprobes. To connect the Ag/Fe-MOFs nanocomposite with more groups, the nanocomposite was functionalized by -COOH with SH-PEG-COOH to bind with an α2,6-sial-Gs catcher, M-APBA, via -CONH- bonds. More importantly, the Ag/Fe-MOFs also exhibited an excellent endogenous redox mediator property to produce electrons, which is the fundamental mechanism underlying amplification of an electronic signal. A gold electrode was used to accelerate electron transfer and immobilize the α2,6-sial-Gs lectin (SNA). After the sandwich-type catcher recognition (SNA/α2,6-sial-Gs/M-APBA), the current peak response was provoked in the process of oxidizing AgNPs to Ag + in the forward anodic potential sweep, while Cl − in a PBS solution was transferred into Ag + to maintain charge neutrality. Optimized particles were employed for direct fabrication of the sandwich-type affinity biosensor, which was found to show a linear detection range from 1 fg mL −1 to 1 ng mL −1 with a detection limit of 0.09 fg mL −1 . Furthermore, the biosensor exhibited excellent specificity and stability, indicating that such a novel nanobiotechnology platform can be used to initiate potential utility for monitoring biomarkers in serum. Graphical abstract
(A)Schematic presentation of synthesis and surface modification of Ag/Fe-MOFs. The new Ag/Fe-MOFs nanocomposite possessed commendable conductivity and large surface area to carry more nanoprobe; after functionalizing the Ag/MOFs with SH-PEG-COOH, the functionalized endogenous redox mediator (c-Ag/MOFs) realized the possibility that can connect with the biological catcher. (B) Schematic diagram of electrode construction for detecting α2,6-sialylated glycans (α2,6-sial-Gs). By using the c-Ag/Fe-MOFs functional endogenous redox mediator, we successfully implemented the electrochemical detection of α2,6-sial-Gs.
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GREEN CHEMISTRY
·
2025
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IF 9.2
Shuling Liu,Tongjun Li,Guozheng Dong,Xinao Wei,Keke Zhao,Bangan Lu,Yu Chen,Yanyan Liu,Jianchun Jiang,Baojun Li
To develop low-cost and efficient oxygen reduction reaction (ORR) electrocatalysts, single-atom catalysts (SACs) have attracted great attention to become vital to the applications of zinc-air batteries (ZABs) because of their high catalytic activity. The development of integrated SACs as self-supporting electrodes is crucial for ZABs to overcome the drawback of powder catalysts requiring binder. Herein, an integrated atomically dispersed FeSA/NC catalyst was obtained by pyrolysis of Fe-containing ZIF-8 on fir wood-derived carbon. The atomically dispersed Fe-N4 is an efficient catalytic active site for ORR. The self-supported ordered porous structure and continuous conductive network of the catalyst provide favorable conditions for the rapid mass/electron transfer. FeSA/NC catalyst demonstrates a positive half-wave potential of 0.90 V in 0.1 M KOH electrolyte and 0.80 V in acidic solution. The outstanding ORR activity outperforms those of commercial Pt/C and most reported M-N-C (M=Fe, Co, Ni, etc.) catalysts. A quasi-solid-state ZAB using the FeSA/NC in cathode shows an excellent peak power density of 77 mW cm–2 at 121 mA cm–2. The performance in quasi-solid-state batteries exceeds that of most other catalysts. This work provides a new path to the catalytically active carbon via design of self-supporting SACs, and a clear demonstration of prospects in quasi-solid-state energy devices.
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Journal of Energy Chemistry
·
2025
·
IF 14.9
Zhixiao Zhu,Meilian Tu,Yu-wen Hu,Weijiang Gan,Jianqiu Deng,Zhongmin Wang,M.-Sadeeq Balogun
Seawater splitting provides a sustainable approach for large-scale hydrogen production without straining freshwater resources. However, the challenge lies in achieving high catalytic activity and stability due to electrocatalyst deactivation from structural degradation, poor corrosion resistance, and surface instability in both alkaline and seawater electrolysis. To address this, we propose a novel strategy combining Fe-doping with dual-phase lattice strain engineering in nickel-molybdenum transition metal nitrides (TMNs). The Fe-doped Ni 3 Mo 3 N/Mo 2 N electrocatalyst exhibits compressive lattice strains of −4.52% and −2.91% in the Ni 3 Mo 3 N and Mo 2 N phases, respectively, enhancing its structural integrity and electronic properties. Consequently, Fe-Ni 3 Mo 3 N/Mo 2 N achieves low overpotentials of 167 and 371 mV at current densities of 10 and 500 mA cm −2 , respectively, in 1 M alkaline seawater, with exceptional stability over 100 h at 100 and 500 mA cm −2 . Theoretical calculations reveal that these compressive strains optimize the adsorption of OER intermediates and improve catalytic kinetics. This work demonstrates the promise of dual-phase lattice strain engineering in TMNs for efficient, durable, and scalable electrocatalysts in seawater electrolysis, a strategy that has yet to be fully explored for OER.
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