SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xingyao Zeng,Zhanghao Xu,Hangyu Mo,Jian Zhuang,Zengchao Xing,Yage Xie,Jiawei Qiu,Ji Yu,Guojun Jiang,Xiangyu Ye
Developing efficient absorbents for the cleanup of highly viscous crude oil spills is of critical importance. The current light-to-heat/electric-to-heat methods to reduce the viscosity of crude oil were limited by the complicated preparation processes, weather conditions and potential risk of electrical leakage. Here, a robust superhydrophobic composite Fe 3 O 4 /PAN/PBA nanofibrous aerogel (NFA) with excellent photo/magneto-thermal performance for efficient all-weather viscous crude oil spill remediation was fabricated by integrating facile blend electrospinning and freeze-drying techniques. Due to its superhydrophobicity/superoleophilicity (water contact angle of 151.3° and oil contact angle of 0°) and anisotropic microchannel structure, the composite NFA exhibited rapid adsorption kinetics and ultra-high absorption capacity (54.4 − 97.1 g/g) toward various low-viscosity oils and organic solvents. Meanwhile, it displayed outstanding mechanical recyclability (84.07 % recovery after 200 cycles at 80 % strain) and reusability (86.74 % of the initial capacity after 10 absorption-squeezing cycles). Notably, the composite NFA also showed excellent photo/magneto-thermal conversion efficiency, allowing it to achieve continuous and efficient cleanup of crude oil (recovery rate of 6.67 x10 3 kg m −3 h −1 ) via peristaltic pumping. Therefore, this material holds great potential for all-weather cleanup of crude oil spills.
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高影响因子
VACUUM
·
2024
·
IF 3.8
Mingyi Ma,Xiajun Zhang,Haoda Zhang,Zhihao Xu,Shasha Li,Ruijiang Liu
Early-stage colorectal cancer (CRC) is often asymptomatic, leading to late diagnoses and impacting treatment outcomes. Timely detection and diagnosis are crucial, with serum carcinoembryonic antigen (CEA) levels playing a key role in CRC diagnosis and prognosis. To enhance precision, a label-free electrochemical nano-biosensor utilizing magnetic self-assembly (MSA) technology was developed for sensitive CEA detection. The biosensor's core was the α-Fe 2 O 3 /Fe 3 O 4 nanorods prepared by the hydrolysis-calcination reduction process. Its unique magnetism was the cornerstone of MSA technology. The biosensor exhibited excellent mechanical strength, ensuring stability during storage at 4 °C for at least one month. The aptamer probe (CEAA) self-assembled on the nanorods' surface via an Au–S bond, creating the magnetic probe (CEAA/α-Fe 2 O 3 /Fe 3 O 4 @Au). Upon capturing CEA, the current response decreased, indicating a “turn-off" nano-biosensor type as observed through differential pulse voltammetry (DPV) monitoring. In this research, the biosensor not only exhibited robust specificity and superior anti-interference ability but also demonstrated successful regeneration. The limit of detection (LOD) was 0.197 pg/mL, the recovery rate for real serum samples was between 94.15 % and 105.08 %, and the relative standard deviation (RSD) ranged from 1.40 % to 2.09 %. This biosensor showed promise in enhancing the accuracy and effectiveness of CRC diagnostic and prognostic protocols, offering a new direction for point-of-care testing.
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ACS Applied Electronic Materials
·
2025
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IF 4.7
Renxin Xu,Hongyi Luo,Zhengyi Li,Yahan Gao,Wei Zhao,Xiao Li,Wei Jin,Dan Liu
Poor microwave-absorbing performance of a carbonaceous–magnetic hybrid at low frequency is one of the great challenges that needs to be solved urgently. Constructing a three-dimensional structure of a graphene-based absorber with high-loading ferrite nanoparticles onto graphene surfaces is an effective strategy to boost the low-frequency absorbability. Therefore, we constructed substrates of crumpled monolayer graphene oxide spheres by first spray-drying and synthesized high-loading iron hydroxide nanograins onto the substrates by a simple oil-bath heating. Followed by an annealing treatment under Ar gas, an ultrahigh Fe3O4 magnetic crystals loading onto crumpled spherical reduced graphene oxide hybrid (Fe3O4@crGO) was obtained. The wrinkled architecture provides a large number of interface angles for ultrahigh Fe3O4 nanocrystals to avoid the massive agglomeration, which lowers the complex permittivity and improves the complex permeability to perfect absorber’s impedance matching at low frequency. Meanwhile, the impressive conducting loss of rGO, magnetic loss of Fe3O4 nanograins, polarization loss of heterogeneous interfaces, and multiple reflection and scattering of microwaves within the three-dimensional architecture boost the attenuation capability of the absorber. As a result, the as-prepared Fe3O4@crGO-30 hybrid exhibits a superb reflection loss of −52.3 dB at 5.4 GHz. In addition, by tailoring the thickness ranging from 2.5 to 5.0 mm, full coverage absorption in C and X bands can be achieved. This work provides a simple, efficient, and promising way to prepare a graphene-based absorber with perfect low- and middle-frequency absorption capacity.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-11
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IF 5.3
Mei Lin,Wei Bingjie,Liu Chunyan,Zhao Mengting,Cui Tian,Wei Xiangyang
A highly efficient colorimetric sensor was developed for detecting glutathione using polyvinylpyrrolidone-stabilized ultra-small Fe 3 O 4 nanoparticles integrated with graphene oxide (GO-Fe 3 O 4 ). These nanoparticles are highly water-dispersible and uniformly distributed, enabling extensive interaction with the analyte and enhancing detection sensitivity. The integration of Fe 3 O 4 nanoparticles on the graphene oxide surface prevents aggregation and exposes more active sites, thereby enhancing their catalytic activity significantly. The GO-Fe 3 O 4 nanocomposites exhibit a dramatically enhanced Fenton reaction, showing a fourfold increase in catalytic effect compared to bare Fe 3 O 4 nanoparticles. This is attributed to the synergistic peroxidase-like activity within the 3,3′,5,5′-tetramethylbenzidine (TMB)-hydrogen peroxide colorimetric system. Moreover, the GO-Fe 3 O 4 nanozyme has an excellent binding affinity to TMB, which is up to tenfold higher than that of horseradish peroxidase. The TMB is catalyzed by the GO-Fe 3 O 4 nanozyme to produce a blue oxidized form, and the presence of glutathione selectively inhibits this color change. This inhibition forms the basis for the quantitative determination of glutathione. Under optimal conditions, the colorimetric sensor demonstrated a linear response to glutathione concentrations ranging from 0.1 to 10 μmol/L, with a detection limit as low as 9.17 nmol/L ( S/N = 3). The developed method showcased excellent selectivity, reproducibility, and accuracy. It was effectively used to determine glutathione in rat serum samples and monitor its pharmacokinetics in vivo. Graphical
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Mengxin Liu,Haoran Zhang,Xinmeng Huang,Ziyi Zhang,Kunlai Zhang,Zhenwu Chen,Jintang Zhou,Lei Pan
It is crucial to develop electromagnetic interference (EMI) shielding materials with high shielding efficiency (SE) and reduced reflection to mitigate the secondary pollution caused by electromagnetic waves (EMWs). Herein, a novel multilayer assembly strategy inspired by the structure of “Turkish dessert—Baklava” is proposed to introduce magnetic hollow Fe 3 O 4 nanospheres (HFO) and conductive MXene nanosheets into a bacterial cellulose (BC) network. Through a layer-by-layer vacuum filtration approach, a composite BC/MXene/HFO film with a controllable electric-magnetic dual-gradient structure is achieved. The construction of electric-magnetic dual gradients alleviates the impedance mismatch at the air-film interface, resulting in reduced reflectivity toward EMWs, while the unique hollow structure of HFO facilitates the “absorption–reflection–reabsorption” process of EMWs. Consequently, the as-prepared composite film (0.35 mm thickness) exhibits an extraordinary EMI SE of 67.6 dB and a reflection SE as low as 5.1 dB. Furthermore, it also demonstrates exceptional mechanical properties, efficient thermal management, and Joule heating capabilities, as well as remarkable passive and active infrared camouflage performances. This study offers an innovative approach to achieve less reflection and more absorption of EMWs, and expands the application scope of EMI shielding materials in precision electronics, aerospace, and military equipment fields.
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Journal of Water Process Engineering
·
2024
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IF 6.3
Weimin Chen,Renjian Deng,Yilin Chen,Chuang Wang,Baolin Hou,Saijun Zhou,Andrew Hursthouse
Arsenic and antimony removal technology have received significant attention due to their considerable danger to aquatic ecosystems. In this study, we designed HCO–(Fe 3 O 4 ) x adsorbents with substantial functional groups, ample pore spaces, and considerable surface area , specially tailored for the simultaneous adsorption of pentavalent arsenic (As( V )) and pentavalent antimony (Sb(V)). The adsorption performance of HCO–(Fe 3 O 4 ) x was subjected variably to the Ce/Fe molar ratio (CFMR), solution pH, and co-existing anions (SO 4 2− , PO 4 3− , SiO 3 2− ). The affinity order of As(V) and Sb(V) onto HCO–(Fe 3 O 4 ) x in binary systems was pH-dependent. At a pH of 2.0, Sb( V ) exhibited stronger adsorption than As(V), whereas the opposite trend occurred at pH levels above 4.0. Analysis of the kinetic data revealed the pseudo-second-order kinetic model was the most appropriate, indicating that chemical adsorption was the predominant mechanism. Notably, the formation of inner-sphere complexes led to a higher adsorption rate for As( V ) compared to Sb(V), attributed to a lower energy barrier of 0.863 eV, facilitating the breakdown of the Fe O bond in As(V)'s asymmetric tetrahedral structure. Various analyses (FTIR, XRD, and XPS) demonstrated that adsorption mechanisms involved multiple processes like hydrogen bonding , ligand exchange, electrostatic attraction, and complexation. The primary contributions for the adsorption of As( V ) and Sb(V) were the inner-sphere complex of cerium , oxygen and arsenic atoms (Ce O As) and the outer-sphere complex of iron, oxygen and antimony atoms (Fe O Sb), respectively, indicating significant differences in the mechanisms. These findings underscored the potential of HCO–(Fe 3 O 4 ) x in mitigating As( V ) and Sb(V) water pollution, emphasizing its considerable promise as an effective remediation agent.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Luyao Shi,Qinyuan Yu,Ziqi Guo,Xuedong Wei
The composite electrocatalyst of Ni(OH)₂@Fe-BDC@ Fe 3 O 4 /NF was successfully prepared. • The Ni(OH)₂@Fe-BDC heterostructure and dispersed Fe 3 O 4 nanoparticles optimize electron transfer pathways. • It is outstanding catalyst with the overpotential of 149 mV at 10 mA·cm⁻². • It has durable OER life with nearly 100 h under initial 110 mA·cm −2 . • It possesses equally excellent HER and overall water splitting performance. Metal-organic frameworks (MOFs) have gradually become highly promising electrocatalytic materials applied in the reaction of oxygen evolution (OER), thanks to their extraordinarily high specific surface area, adjustable pore structure as well as ample redox active sites. However, their practical applications are hindered by intrinsically low electrical conductivity and inadequate cycling stability. The present research introduces a brand-new Ni(OH) 2 @Fe-BDC@Fe 3 O 4 /NF nanocomposite electrocatalyst that was successfully prepared via a stepwise solvothermal method on a Ni foam (NF) support. Systematic structural characterizations confirmed that Ni(OH) 2 nanosheets in the composite exists as a mixture structure of honeycomb-like and flower-cluster-like, which uniformly anchored at the surface of Fe-BDC@Fe 3 O 4 /NF. Moreover, the coexistence of Ni(OH) 2 , Fe-BDC and Fe 3 O 4 three phases was verified in the composite. And Fe 3 O 4 nanoparticles are evenly dispersed in Fe-BDC crystal nanolayers. Electrochemical tests in 1 mol/L KOH alkaline electrolyte demonstrated that the Ni(OH) 2 @Fe-BDC@Fe 3 O 4 /NF composite exhibited superior OER catalytic activity and complete hydrolysis performance compared with the single-component Ni(OH) 2 /NF and Fe-BDC@Fe 3 O 4 /NF, delivering an overpotential as low as 149 mV under a current density of 10 mA·cm −2 , alongside a full water decomposition voltage of 1.53 V at 50 mA·cm −2 . The improved performance stemmed from the strong interfacial electronic interaction between Ni(OH) 2 and Fe-BDC@Fe 3 O 4 , which induced a negative shift in the binding energies of Ni 2p and Fe 2p, increased the interfacial charge density, reduced the charge transfer resistance (Rct = 0.8 Ω) and enlarged the electrochemical specific surface area (ECSA). In addition, the composite showed excellent long-term durability, with only 8.30% activity decay following 100 h of non-stop chronoamperometry testing under initial current density of about 110 mA·cm −2 . Structural evolution analysis after the stability test revealed that the Fe 3 O 4 phase underwent reductive decomposition and in-situ reconstruction with Ni(OH) 2 to form amorphous Ni- Fe oxyhydroxide, which served as the real active sites. This research offers a feasible approach for the structural design of iron-based MOF composite electrocatalysts, deepens the understanding of the role of interfacial synergetic mechanism between metal hydroxides and MOFs in improving OER performance, and offers experimental evidence for the advancement of high-performance non-noble metal electrocatalysts applied in water electrolysis. Download: Download high-res image (202KB) Download: Download full-size image
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RSC Advances
·
2026
·
IF 6.1
Jinxin Fang,Hongli Guo,Chenling Xu,Shiyu Wang,Daoxiang Jiang,Qin Huang,Bao Yu,Weiguo Cao,Haijun Huang
Heavy metal contamination in traditional Chinese medicines (TCMs) and their preparations is an urgent quality and safety issue to be addressed in the industrialization of TCMs. Herein, a novel magnetic composite of MgAl-LDHs@FRBCs/Fe 3 O 4 was prepared as the adsorbent, which was fabricated by using the leaves ( Isatidis Folium ) and roots ( Isatidis Radix ) of Isatis indigotica as the carbon source for biochar (FRBCs), followed by in situ growth of MgAl-layered double hydroxides (MgAl-LDHs). In the aqueous extract of Ligusticum chuanxiong Hort. (CX), the composite exhibited high simultaneous removal efficiencies for multiple heavy metal ions: 96.53% for Pb 2+ , 78.49% for Cu 2+ , 83.82% for Cd 2+ , and 35.48% for Ni 2+ . The adsorption process fitted better with the pseudo-second-order (PSO) kinetic model and Langmuir isotherm, indicating that the adsorption was dominated by monolayer chemisorption. Meanwhile, a certain correlation with the pseudo-first-order (PFO) kinetic model was also observed, reflecting the participation of the physisorption. Thermodynamic parameters (Δ H = 25.84–105.42 kJ mol −1 , Δ S = 122.15–386.15 J mol −1 K −1 , Δ G = −17.37 to −9.65 kJ mol −1 ) confirmed a spontaneous and endothermic process with increased disorder. Further mechanism investigation by pH-dependent experiments, zeta potential measurements, and XPS revealed that the adsorption occurred mainly through electrostatic interactions and chemical complexation. Importantly, HPLC analysis revealed no significant alteration of the major bioactive components in the CX extract after adsorption. The composite also exhibited fast adsorption kinetics, high removal efficiency under competitive conditions, good stability and reusability, and easy magnetic separation. The current work provides a high-performance adsorbent for heavy metal removal from TCM aqueous extracts, which also offers a sustainable strategy for valorizing TCM residues. Herein, a novel magnetic composite of MgAl-LDHs@FRBCs/Fe 3 O 4 was prepared, and the adsorption performance and mechanism of this composite for multiple heavy metal ions in the aqueous extract of Ligusticum chuanxiong Hort. were investigated.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Hanjie Huang,Ying Huang,Jiale Ma,Qianqian Niu,Chenbo Liu,Jian Jiao,Meng Zong
Core-shell Fe 3 O 4 @CQDs composites were fabricated via a facile hydrothermal method, and their microstructure as well as electromagnetic parameters were precisely optimized by adjusting CQD loading content. • The distinctive core-shell heterogeneous structure creates abundant interfacial defects and polarization sites. The synergism of dipole polarization, interfacial polarization, multiple scattering and magnetic loss builds multi-channel electromagnetic energy dissipation system. • The as-prepared material exhibits excellent microwave absorption performance with a minimum reflection loss of −77.32 dB and a maximum effective absorption bandwidth of 9.52 GHz, combining strong absorption, broad bandwidth and thin matching thickness. • This work clarifies the structure-performance relationship among component composition, interfacial microstructure and microwave absorption properties. It also broadens the application scope of carbon quantum dots and provides new insights for the design and utilization of carbon-magnetic composite absorbers. The rapid development of modern communication technologies aggravates electromagnetic pollution, creating an urgent need for high-performance electromagnetic wave (EMW) absorbers. Carbon materials are promising candidates due to their tunable microstructures and large specific surface areas. Nevertheless, traditional carbon materials suffer from severe agglomeration and high permittivity, leading to poor impedance matching and narrow effective absorption bandwidth. As an emerging carbon nanomaterial, carbon quantum dots (CQDs) possess low dielectric permittivity, tunable electromagnetic parameters, abundant surface functional groups, ultralow density, good dispersibility and high interfacial activity, while their potential for microwave absorption is still underexplored. Herein, core-shell Fe 3 O 4 @CQDs composites were fabricated via a facile hydrothermal method to overcome the limitations of traditional absorbers including narrow bandwidth, unsatisfactory impedance matching and single loss mechanism. CQDs act as dielectric components and Fe 3 O 4 serves as magnetic loss substrate. Adjusting CQD loading optimizes the microstructure and electromagnetic properties, and the distinctive core-shell heterogeneous structure achieves efficient magneto-dielectric synergistic loss. The optimized Fe 3 O 4 @CQDs-2 shows a minimum reflection loss of −77.32 dB at 2.37 mm and a maximum effective absorption bandwidth of 9.52 GHz, covering the frequency range from 8.48 to 18.00 GHz at a thickness of 3.1 mm. CST simulations confirm its excellent radar stealth performance. This work provides a facile route to prepare lightweight, ultrathin, broadband and high-efficiency EMW absorbers and expands the application of CQDs in electromagnetic functional devices. Download: Download high-res image (146KB) Download: Download full-size image
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高影响因子
ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Qianqian Jiang,Renlong Chen,Tong Zhang,Hao Shen,Cheng Zhang,Kui Zhang,Zhongping Zhang
Lateral flow immunochromatographic assay (LFIA) features advantages such as a rapid analysis process, interpretable detection results, and low cost, making it an effective method for on-site detection of pesticides. However, the existing LFIA technologies still face bottleneck issues, including strong background fluorescence interference from the substrate and insufficient detection sensitivity for low pesticide residue levels. Here, long-lived room-temperature phosphorescent carbon dots embedded in silica (CDs@SiO2) were developed to overcome background fluorescence interference. Fe3O4 coated with dopamine (Fe3O4@PDA) was utilized for the enrichment of target pesticide molecules. Meanwhile, by virtue of the quenching effect of Fe3O4@PDA on CDs@SiO2, colorimetric and phosphorescent dual-mode LFIA technology was designed for the detection of the pesticide acetamiprid. Through the integration of the advantages of CDs@SiO2 and Fe3O4@PDA, the limit of detection (LOD) for acetamiprid was as low as 0.271 ng/mL, and satisfactory recoveries were achieved in real samples. This research breaks through the millisecond-level lifetime limitation in traditional time-resolved fluorescence immunoassays, providing novel insight for the development of labeling materials for LFIA.
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高影响因子
Environmental Technology & Innovation
·
2026
·
IF 7.3
Junjie Su,Qi Yang,Yanlun Chu
The remediation of water bodies co-contaminated with heavy metal and chlorinated organic pollutants presented significant technical challenges. In this work, a Ni/Fe@Fe 3 O 4 and an ultrasound-assisted Ni/Fe@Fe 3 O 4 co-removal reaction system were established for the simultaneous removal of co-existing pollutants carbon tetrachloride (CT) and hexavalent chromium (Cr(VI)). Results demonstrated that CT promoted Cr(VI) removal, while Cr(III)/Fe(III) oxides/hydroxides (Cr(VI) reduction products) formed on the surface of Ni/Fe@Fe 3 O 4 effectively inhibited the CT degradation. The ultrasound significantly enhanced the Ni/Fe@Fe 3 O 4 co-removal reaction system, accelerating complete Cr(VI) removal and boosting CT removal efficiency from 69.24% to 95.62%. Ultrasound treatment improved the long-term reactivity of Ni/Fe@Fe 3 O 4 , achieving consistent 100% removal of Cr(VI) with only a marginal 5.56% decrease in CT removal efficiency over five cycles. Ultrasound and Ni/Fe@Fe 3 O 4 had a significant synergistic effect on the removal of pollutants, with a synergy index of 2.06. The enhancement mechanism of ultrasound on co-contamination removal by Ni/Fe@Fe 3 O 4 included: (1) improving nanocomposite dispersibility and optimizing the reaction interface; (2) removing the passivation layer on the surface of Ni/Fe@Fe 3 O 4 to expose more active sites.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Guqing Xiao
2,4-Dichlorophenol (2,4-DCP) is a persistent organic pollutant that has been found in various water bodies. D301 anion exchange resin was anchored for the nanoconfinement of Fe 3 O 4 crystal (D301-Fe 3 O 4 ) to design 2,4-DCP adsorbent. In-situ grown Fe₃O₄ in D301-Fe 3 O 4 exhibited uniform distribution, nano crystal and strong superparamagnetism. The excellent thermal and chemical stability of D301-Fe 3 O 4 enabled its large-scale practical applications over a broad pH range (3−13), high salinity and alkalinity. The adsorption capacities of 2,4-DCP on D301-Fe 3 O 4 were superior to those of H103, XAD-4, D301, D201-Fe 3 O 4 and D201. D301-Fe 3 O 4 exhibited greater adsorption rate than D301. In the presence of interfering electrolytes and heavy metal Cd 2+ , D301-Fe 3 O 4 showed prominent anti-interference ability than D301. The synergistic adsorption mechanism of 2,4-DCP on D301-Fe 3 O 4 involved hydrophobic interaction, hydrogen bonding, π-π interaction and coordinate bonding. Ten adsorption-desorption cycles demonstrated that D301-Fe 3 O 4 could be effectively refreshed with 80% C 2 H 5 OH-1.5% NaCl and stably reused. 10 mL (1BV) of D301-Fe 3 O 4 could continuously purify 1584.4 BV of agricultural ditch water containing 0.05 mg/mL 2,4-DCP without the leakage of 2,4-DCP. Only 14.9 BV of 80% C 2 H 5 OH-1.5% NaCl as regenerant, the recovery rate of 2,4-DCP reached 95.87%. D301-Fe 3 O 4 holds great potential for 2,4-DCP wastewater treatment.
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