JOURNAL OF HAZARDOUS MATERIALS
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2011
·
IF 3.723
Jianming Pan,Hang Yao,XiuXiu Li,Bing Wang,Pengwei Huo,Wanzhen Xu,Hongxiang Ou,Yongsheng Yan
The chitosan/fly-ash-cenospheres/γ-Fe 2 O 3 (CTS/γ-Fe 2 O 3 /FACs) magnetic composites were prepared by microemulsion process. The resulting composites were charcterized by XRD, FT-IR, SEM, TGA , DTG and VSM, and the results indicated that CTS/γ-Fe 2 O 3 /FACs exhibited magnetic property ( M s = 6.553 emu g −1 ) and thermal stability, and composed of chitosan wrapping magnetic γ-Fe 2 O 3 and fly-ash-cenospheres (thickness of the cross-linked chitosan was about 5.2 μm). Then the CTS/γ-Fe 2 O 3 /FACs were employed as adsorbents for the fast removal of bisphenol A (BPA) and 2,4,6-trichlorophenol (TCP) from aqueous solutions. The adsorption performances of CTS/γ-Fe 2 O 3 /FACs were investigated by batch mode experiments with respect to pH, temperature, initial concentration, contact time and binary solution system. The Langmuir isotherm model was fitted to the equilibrium data better than the Freundlich model, and the kinetic properties were well described by the pseudo-second-order equation. The effects of binary solution systems also demonstrated that BPA adsorption onto CTS/γ-Fe 2 O 3 /FACs was more affected by the simultaneous presence of competitive phenolic compound than that of TCP. In addition, the resulting composite reusability without obviously deterioration in performance was demonstrated by at least three repeated cycles.
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高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Yang Shuhui,Ke Xi,Zhang Menglong,Luo Dongxiang
Metal nanoparticles have been extensively used as co-catalysts in photocatalytic systems in order to pursue improvements in both reaction kinetics and selectivity. In this work, PdAg dual-metallic nanoparticles synthesized by the co-reduction method were decorated on a well-established α-Fe2O3/CdS Z-scheme photoactive material as a co-catalyst to study their performance for promoting the photoreduction of CO2. Herein, α-Fe2O3 and CdS were in situ synthesized on fluorine-doped tin oxide (FTO) glass by hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods, respectively. The direct Z-scheme charge transfer path between Fe2O3 and CdS and the effective electron migration toward the PdAg mainly contributed to the excellent photocatalytic CO2 reduction performance. The controllable work function based on Pd (5.12) and Ag (4.26) constructed an appropriate band alignment with α-Fe2O3/CdS and displayed favorable production for CH4 rather than CO. The optimum ratio of PdAg 1:2 performed a 48% enhancement than pure Pd for photoreduction of CO2. Meanwhile, the enhanced charge separation improved the photoelectrochemical performance and photocurrent generation, and reduced the electrical resistance between components. This work provided insights into the dual-metallic co-catalyst for boosting the activity and selectivity of photocatalytic CO2 reduction.
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COMBUSTION AND FLAME
·
2021
·
IF 4.185
Ye Wu,Jian Mei,Tianyi Cai,Wei Wang,Hang Zhu,TianLi Sun,Dong Liu
Ammonia is considered to be a green energy due to its carbon-free footprint, high energy density, cheap transport costs and so on. However, the problem of NO x (mainly NO/NO 2 ) emissions especially at high temperature (>800 °C) inhibits the energy utilization progress of NH 3 (Such as NH 3 combustion). So, catalytic combustion of NH 3 is supposed to be a promising method to solve this problem but there is a rare report on that. The NO x emissions or N 2 selectivity performances in the NH 3 oxidation process with different catalyst was conducted with Density functional theory (DFT) and experimental studies. Results showed that, when Fe 2 O 3 was used as catalyst, the conversion efficiency of NH 3 was 96.2%, and the selectivity of N 2 was 97.7%, which was higher than oxidation of NH 3 without catalyst. DFT simulation showed that NH 3 and O 2 can be separately adsorbed on Fe (top) of Fe 2 O 3 (001), the adsorption of NH 3 and O 2 were enhanced when they were put on Fe (top) of Fe 2 O 3 (001) at the same time. Meanwhile, the length of inter-atomic bond increased thus creating oxygen vacancy , which promoted the oxidation of NH 3 . Finally, a Ni modified Fe-based catalyst (NiO10%/Fe 2 O 3 30%/Al 2 O 3 60%), full of oxygen vacancy (confirmed with X-ray photoelectron spectroscopy (XPS)), was fabricated with impregnation method. The adsorption of NH 3 and O 2 were further enhanced (confirmed by DFT simulation), the NH 3 conversion efficiency and the N 2 selectivity were stably improved to 96.8% and 100%.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zijie Liu,Seulgi Ji,Shiqi Zhao,Xinge Hu,Xingda An,Tianqi Liu,Xiaorong Cheng,Heechae Choi,Graham Dawson
In order to boost the photocatalytic water splitting activity of g-C 3 N 4 , depositions of various multiple cocatalyst combinations have been suggested in a number of previous studies. Despite the improvement in photocatalytic activities bestowed on g-C 3 N 4 layers by the junctions of multiple cocatalyst particles at once, the complexities of synthesis procedures and fabrication conditions retard the wider applications or commercialization of such materials. In this study, we introduce a new effective strategy to improve the activity of a g-C 3 N 4 photocatalyst in water splitting: dual function hole carrier transport enhancement and reduced surface reaction energy barrier with phase-control of Fe 2 O 3 . The self-assembled solvothermal composites of Fe 2 O 3 and g-C 3 N 4 resulted in the formation of a three-phase heterojunction. The best composite demonstrated an effective hydrogen production rate of 5.53 mmol g −1 h −1 . The formation of the three-phase heterojunction between the two components was shown to alter the chemical environment and a band diagram of the system is proposed. Our density functional theory (DFT) calculations and ultraviolet photoemission spectroscopy (UPS) measurements revealed that the combination of ε-Fe 2 O 3 and α-Fe 2 O 3 improves the photocatalytic activity of g-C 3 N 4 by Fermi level pinning.
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 8
·085502
·
IF 3.551
Shujing Wu,Juan Du,Qisen Xiang,Dianbo Zhao,Yanhong Bai
The immunochromatographic strip test (ICST) is a powerful on-site detection technology due to its unique advantages of simplicity, rapidity, and readability by the naked eye. Here we illustrate the potential of α-Fe2O3 polyhedrons as a novel visual label, which exhibit advantages of high stability and economy, for the detection of Listeria monocytogenes (L. monocytogenes) as a model foodborne pathogen. A low-cost and simple one-step solvothermal approach was developed for the synthesis of α-Fe2O3 polyhedrons; the average diameter of the α-Fe2O3 polyhedrons is about 200 nm. The crystal structure and morphology of α-Fe2O3 polyhedrons were characterized by x-ray diffraction and transmission electron microscope. α-Fe2O3 polyhedrons were immunized with anti-L. monocytogenes antibody to prepare an antibody–colloidal α-Fe2O3 polyhedron ICST. Visual detection can be obtained directly by the naked eye within 10 min. The detection limit of L. monocytogenes by α-Fe2O3 polyhedron ICST assay was 3.8 × 106 and 5.6 × 106 CFU/ml of pure culture and artificially spiked orange juice drink sample, respectively. Results indicated that the antibody–colloidal α-Fe2O3 polyhedron ICST is a rapid, simple, and low-cost assay. This approach showed great potential in the application of foodborne pathogen detection concerning food safety.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23607-23620
·
IF 7.443
Zhifeng Jiang,Deli Jiang,Wei Wei,Zaoxue Yan,Jimin Xie
In this work, we fabricated size-tunable metal (Pd, Ag) nanoparticles grafted on bionic dendritic α-Fe2O3 (M@Fe2O3) through an in situ growth method by using carbon nanodots as a reducing agent followed by a hydrothermal reaction. The size of the supported noble metal nanoparticles can be directly controlled on the surface of dendritic α-Fe2O3 by adjusting the added amount of noble metal salts. The catalytic performances of the resulting M@Fe2O3 hybrid composites were firstly evaluated by reduction of p-nitrophenol. The results indicated that the size of the noble metal nanoparticles had a crucial influence on the catalytic behaviors of the M@Fe2O3. In addition, the dendritic M@Fe2O3 also showed improved photocatalytic efficiencies for visible-light-driven MB degradation due to synergic effects between dendritic α-Fe2O3 and noble metal nanoparticles, including optical properties, unique structure, good dispersion, good charge separation and the SPR effect. The M@Fe2O3 composites have good reproducibility and are highly stable for p-nitrophenol reduction/degradation of MB. Our strategy can be extended to a general strategy for the formation of other novel composites consisting of a 3D hierarchical metal oxide and noble metal nanoparticles with tailorable size (e.g., Pt@TiO2, Pd@MnO2, Au@ZnO and Ag@Cu2O) for broad applications in water treatment.
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高影响因子
Materials Horizons
·
2025
·
IF 10.7
Evgeny A. Gorbachev,Yifan Wang,Jingtong Duan,Roy R. Nygaard,Ekaterina Kozlyakova,Lev A. Trusov
In this study, we present a principal methodology for semi quantitative analysis of magnetic phase composition during thermogravimetry under a gradient magnetic field, specifically in cycling mode. This approach is demonstrated using Fe-Si-O xerogels, in which magnetic nanophases such as ε-, γ-, and α-Fe₂O₃ can coexist and transform into each other. We introduce a novel, time-efficient quasi in situ approach to identify and optimize heat treatment conditions for synthesizing ε-Fe₂O₃ as a single phase, a material with significant industrial demand. Our results provide a valuable framework for advancing the controlled synthesis of magnetic compounds.
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PubMed
高影响因子
APPLIED BIOCHEMISTRY AND MICROBIOLOGY
·
2024
·
IF 1
Zhu Y. B.,Zhang W.,Fan Y. L.,Chen Y. Y.,Zhu J. L.,Lu H. X.
Abstract Two immunochromatographic assays based on hematite (α-Fe 2 O 3 ) nanoparticles were developed for rapid detection of aflatoxin M1 (AFM1) and Escherichia coli O157:H7 in the milk. Hematite nanoparticles were prepared and utilized as colored signal labels. The competitive format was applied for AFM1 detection, while the sandwich format for E. coli O157:H7 determination. Under optimal conditions, the assay exhibited a visual detection limit of 0.10 ng/mL and quantitative determination limit of 0.017 ng/mL for AFM1. For E. coli O157:H7, a visual detection limit of 2.9 × 10 5 CFU/mL was achieved. The entire determination process could be accomplished within 15 min. Compared with traditional nanolabels, hematite nanoparticles showed advantages of facile preparation, high stability and easy bioconjugation. The developed assays provided effective and rapid screening strategies for AFM1 and E. coli O157:H7 in milk samples with high sensitivity and specificity.
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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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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jieli Guo,Shanmei Tu,Limin Li,Xiujing Xing,Wei Xiong,Hao Li
Combining two metal–organic frameworks (MOFs) with different compositions and structures is an effective way to grow MOF-on-MOF materials. MOF-on-MOF-derived Fe2O3/CoFe2O4 nanocomposites were constructed by epitaxial growth method and high-temperature heat treatment. The morphology and structure of Fe2O3/CoFe2O4 were modulated by varying different organic ligands, and their effects on the detection properties of Pb2+, Cu2+, Hg2+, and Cd2+ were explored. Co3O4 microspheres acted as stabilizing seeds, and typical samples of Fe2O3/CoFe2O4-2 nanocomposites showed spherical nanoparticles of the core–shell type with an average diameter of about 55–60 nm. Meanwhile, compared with individual MOF derivatives, the surface of MOF-on-MOF derivative materials had higher electrical conductivity and active surface area by high-temperature heat treatment, thus promoting efficient adsorption of a wide range of heavy metal ions (HMIs). Furthermore, Fe2O3/CoFe2O4-2/GCE exhibited excellent electrochemical detection performance for the simultaneous detection of Pb2+, Cu2+, Hg2+, and Cd2+ with low limit of detection (LOD) of 2.98, 8.56, 4.44, and 5.40 nM, respectively. By two-by-two and three-by-three assays, promoting and inhibiting effects of different HMIs were observed on the target ions. This work is significant for the development of high-performance MOF-on-MOF-derived Fe2O3/CoFe2O4 nanocomposites for real-time environmental monitoring.
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高影响因子
ChemCatChem
·
2026
·Vol. 18
·期 15
·e70976
·
IF 4.1
Yuxuan Qiao,Yan Lv,Nannan Zhao,Xueyan Wu,Rui Xue,Jixi Guo
The development of efficient and durable non-precious metal electrocatalysts for the oxygen reduction reaction (ORR) is critical to advancing electrochemical energy devices. Herein, we report a porous, carbazole-based N-doped carbon framework catalyst embedded with Fe 2 O 3 nanoparticles and Fe-N x sites. The catalyst was synthesized via pyrolysis of N-rich hypercrosslinked polymers (NHCP), which were derived from the Friedel-Crafts reaction, followed by incorporation of hemin (Fe 2 O 3 /NHCP-2). The introduction of hemin not only preserved the pristine porous architecture but also facilitated the formation of Fe 2 O 3 nanoparticles and Fe-N x sites, and their synergistic effect enhanced the ORR kinetics in alkaline media. The optimized Fe 2 O 3 /NHCP-2 catalyst exhibited a high half-wave potential of 0.87 V and demonstrated robust long-term durability in a 0.1 M KOH solution. When employed as the cathode material in zinc-air batteries (ZABs), it delivered a peak power density of 186.84 mW cm −2 and a specific capacity of 731.37 mAh g Zn −1 . This study presents a promising non-precious metal ORR electrocatalyst for future renewable energy applications. Graphical A porous carbazole-based N-doped carbon framework embedded with Fe 2 O 3 nanoparticles and Fe-N x sites was synthesized by pyrolyzing N-rich hypercrosslinked polymers from a Friedel-Crafts reaction, then hemin incorporation. As a Zn-air battery cathode, Fe 2 O 3 /NHCP-2 delivers a power density of 186.84 mW cm −2 , high specific capacity (731.37 mAh g Zn −1 ) and OCV (1.52 V). The porous structure ensures rapid O 2 transport. Fe 2 O 3 nanoparticles and dispersed Fe-N x sites synergistically enhance ORR. This work demonstrates N-rich hypercrosslinked polymers as effective carbon precursors for high-performance ORR catalysts.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Yingying Chen,Zhihua Liu,Jinshan Liu,Miao Zhou,Zhifeng Liu
The visible-light-driven photoelectro-Fenton technology integrates the synergistic advantages of photoelectrocatalysis and the Fenton reaction. However, the design of current photoanode materials still suffers from issues such as low interfacial charge transfer efficiency and insufficient exposure of active sites. In this study, a novel S-scheme ZnIn 2 S 4 /α-Fe 2 O 3 heterojunction photoanode was successfully constructed. The built-in electric field established at the S-scheme heterointerface effectively facilitates the spatial separation of photogenerated charge carriers. The S O bonds formed at the two-phase interface serve as atomic-level electron transport channels, enabling rapid and directional transfer of photogenerated electrons enriched in the conduction band of ZnIn 2 S 4 to the Fe 3+ sites on the α-Fe 2 O 3 surface, where Fe 3+ is reduced to Fe 2+ . The generated Fe 2+ promotes the conversion of H 2 O 2 to produce hydroxyl radicals (·OH), while the regenerated Fe 3+ from the reaction is again reduced to Fe 2+ by photogenerated electrons, establishing a self-sustaining cycle that endows the system with highly efficient oxidative degradation capability. The results demonstrate that the synergistic mechanism leads to a 5.55-fold increase in the degradation rate. Benefiting from the efficient directional charge transfer and separation, the total organic carbon (TOC) removal efficiency reaches 80.09% within 60 min.
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高影响因子
危险品化学品经营许可证（带存储）