APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Yuyang Liu,Wei Jin,Yaping Zhao,Guangshan Zhang,Wen Zhang
Novel hybrid nanostructures or nanocomposites are receiving increasing attention due to their newly evolved properties. In this work, α-Fe 2 O 3 anchored to graphene oxide (GO) nanosheet (α-Fe 2 O 3 @GO) was synthesized through a facile hydrolysis process and its photo-catalytic performances and durability in heterogeneous Fenton system were fully evaluated. The decolorization rates of methylene blue in α-Fe 2 O 3 @GO + H 2 O 2 + UV system within a wide pH range were approximately 2.9-fold that of classical Degussa P25 TiO 2 + UV and 2.4-fold that of α-Fe 2 O 3 + H 2 O 2 + UV. This enhanced decolorization of methylene blue (MB) in α-Fe 2 O 3 @GO + H 2 O 2 + UV system were attributed to the unique incorporation of GO into the catalyst which not only mediated the morphology of active sites α-Fe 2 O 3 nanoparticles but also offered high electron conductivity and electrostatic attraction between negatively charged GO with positively charged MB. High efficiencies of degradation were achieved on various surface charged organic pollutants (around 96–100%), such as cationic compounds of MB and rhodamine B (RhB), anionic compound Orange II (OII) and Orange G (OG), neutral compounds of phenol , 2-nitrophenol (2-NP) and endocrine disrupting compound 17β-estradiol (E2). The dominant reactive oxygen species (ROS) responsible for decolorization, such as hydroxyl radicals ( OH) and superoxide anion radicals (O 2 − ) generated by activation of H 2 O 2 on the surface of α-Fe 2 O 3 @GO were detected and quantified by free radical quenching methods. The possible degradation mechanism of MB involved the rupture of phenothiazine ring by desulfurization and the rupture of phenyl ring due to the attack of ROS, which was analyzed by LC/MS/MS. The reduction of MB and its intermediates was consistent with the decreasing trend of the acute toxicity towards luminous bacteria with the increasing irradiation time. The results lay a foundation for highly effective and durable photo-Fenton technologies for organic wastewater within wider pH ranges than the conventional photo-Fenton reaction.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhihao Xu,Hezhong Ouyang,Haoda Zhang,Lei Sun,Shasha Li,Ruijiang Liu
A highly sensitive label-free electrochemical aptamer biosensor with magnetically induced self-assembly had been developed to detect gastrin-releasing peptide precursor (ProGRP), which is not only a highly specific tumour marker for small-cell lung cancer (SCLC), but also very stable in serum, and thus had robust clinical utility. Based on the advantages of high specific surface area and facile separation and recycling, magnetic α-Fe 2 O 3 /Fe 3 O 4 nanorods with the average length of 175 nm, the average diameter of 28 nm, and the saturation magnetization of 66.9 emu/g were used as the matrix, and Au nanoparticles (AuNPs) were loaded on the surfaces of the nanorods to enhance the electrochemical signal. The aptamer double-stranded probe with high specificity to the target protein was bound to the surface of α-Fe 2 O 3 /Fe 3 O 4 @Au. The thiol-modified oligonucleotides could quickly and stably bind to AuNPs to form Au-S, which provided a guarantee for the immobilization of the probe and the controllable self-assembled molecular layer. Then, the sensor after capturing the target was self-assembled on the surface of the magnetic glassy carbon electrode (MGCE) by liquid phase incubation for electrochemical detection. The construction and detection performance of the sensor were evaluated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Under the optimized conditions, the sensor had remarkable linearity in the range of 0.1 pg/mL - 100 ng/mL (R 2 = 0.998), the limit of detection (LOD) was 17.51 fg/mL, while the limit of quantitation (LOQ) was 58.39 fg/mL. Additionally, the biosensor had excellent stability, reproducibility and anti-interference ability, as well as satisfactory recovery in spiked serum samples (99.46 %–103.32 %).
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Yue He,Shuang Xiao,Jiabin Zhou,Dan Liu,Zhipu Wang
A novel CuO x /Fe 2 O 3 composite catalyst was synthesized by a hydrothermal method and systematically evaluated for its peroxomonosulfate (PMS) activation capability under visible light irradiation, using tetracycline hydrochloride (TC-HCl) as the model pollutant. The results demonstrated that the CuO x /Fe 2 O 3 catalyst exhibited excellent catalytic oxidation performance, achieving 92.1 % TC-HCl degradation within 30 min through the generation of multiple reactive oxygen species (ROS) under visible light, including superoxide radicals (•O 2 − ), sulfate radicals (•SO 4 − ), hydroxyl radicals (•OH) and singlet oxygen ( 1 O 2 ). The mechanistic studies revealed that synergistic interaction between Fe and Cu bimetallic components significantly enhanced PMS activation efficiency, generating more reactive species and thereby increasing the degradation rate of TC-HCl. In addition, the CuO x /Fe 2 O 3 /PMS/vis system effectively degraded different pollutants (including Ciprofloxacin, Phenol, and Rhodamine B) and showed good tolerance to humic acid (HA) and salinity, among others. These findings highlight the practical potential of the CuO x /Fe 2 O 3 /PMS/vis oxidation system for the removal of organic pollutants in wastewater treatment field.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Li Li,Kunchan Wang,Ting Lei
Exploring high-performance and cost-effective nonprecious metal-based electrocatalysts for overall water splitting is the key to sustainable renewable energy. Herein, petal-like NiFe 2 O 4 /Fe 2 O 3 heterostructure nanoarrays were constructed on iron foam (IF) surface by spontaneous galvanic displacement reaction and subsequent thermal oxidation. This in-situ grown integrated architecture is binder-free and useful for exposing accessible active sites, improving mass transfer and heightening the release of gases produced during water electrolysis. More importantly, the synergistic effect between NiFe 2 O 4 and Fe 2 O 3 effectively modulates the electronic structure of catalytic active sites, thereby promoting electrochemical kinetics. Accordingly, the optimal Ni-FeOx/IF 3 electrocatalyst exhibits remarkably enhanced catalytic activity in alkaline solution with only 230 and 82 mV to reach 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively. The electrolyzer composed of Ni-FeOx/IF 3 as both the anode and cathode attain a current density of 10 mA cm −2 at a cell voltage of only 1.58 V for overall water splitting, with robust durability for 168 h in continuous water electrolysis, outperforming most reported NiFe-based catalysts. This work demonstrates a feasible and simple method to synthesize integrated electrodes with outstanding stability and high-performance for overall water splitting and provides an inspiration for future design of efficient bifunctional electrocatalysts.
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Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-14
·
IF 36.3
Zhong Yihong,Yuan Guotao,Bao Dequan,Tao Yi,Gao Zhenqiu,Zhao Wei,Li Shuo,Yang Yuting,Zhang Pingping,Zhang Hao,Sun Xuhui
The heteroatom atomically doping strategy was reported to construct highly
efficient sites on metal oxides for the detection of low-concentration gas.
The atomically dispersed Sn atoms were intentionally incorporated into the Fe 2 O 3
lattice during the oxidative annealing of Fe-based metal organic framework,
leading to specific Sn–O–Fe sites, porous structures, and abundant oxygen
vacancies.
The optimized Sn-Fe 2 O 3 exhibited exceptional sensing performance for NO 2
detection: ultra-high sensitivity ( Rg / Ra =2646.6 to 1 ppm NO 2 ), ultra-low limit of
detection (10 ppb), and high selectivity.
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PubMed
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Catalysis Science & Technology
·
2025
·
IF 4.2
Ying Hu,Rongkang Yan,Huiyan Pan,Ruyi Cai,Zhili Zeng,Jialun Jiang,Meng Wang,Meng Shan,Shasha Liu,Hai Tang
The integration of adsorption and photocatalysis in heterojunction composites offers a promising strategy for efficient azo dye degradation. Here, a novel α-Fe2O3/perylene-3,4,9,10-tetracarboxylic diimide (PDINH) Z-scheme heterojunction was synthesized via a facile solvent method, showcasing synergistic adsorption–photocatalysis for wastewater treatment. Zeta potential analysis (α-Fe2O3: +14.7 mV; PDINH: −24.3 mV at pH 5.0) and density functional theory (DFT) calculations (binding energy: −3.10 eV) revealed strong electrostatic interactions between α-Fe2O3 and PDINH, enabling uniform nanoparticle dispersion and forming a heterostructure with enhanced specific surface area. Electrochemical measurements confirmed that the Z-scheme heterojunction significantly accelerated charge carrier migration and suppressed electron–hole recombination, facilitated by an internal electric field from well-matched band alignment. Under visible light, the α-Fe2O3-15/PDINH composite achieved 93.4% removal of methyl orange (MO), outperforming PDINH alone (63.1%) due to its positive surface charge (+8.7 mV at pH 5.0) that enhanced selective adsorption of anionic dyes. Quenching experiments identified h+, ·O2−, and ·OH as the primary reactive species, with the Z-scheme pathway retaining strong redox capabilities for efficient degradation. Notably, the composite exhibited an operational cost of $2.41 per ton, significantly lower than other reported processes, and maintained high efficiency (81.8% MO removal) over multiple cycles. This work demonstrates that the α-Fe2O3/PDINH composite integrates adsorption and photocatalysis synergistically, providing a low-cost, scalable solution for azo dye wastewater treatment with potential for industrial application.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Wencheng Hou,Wentao Guo,Xiangjun Liu,Zhuoyang Li,Hongxia Li
Desulfurized gypsum, a byproduct of industrial processes, can be efficiently recycled through solid-phase reaction to synthesize CaFe 2 O 4 . This study investigates the reaction mechanism of CaFe 2 O 4 formation from CaSO 4 , Fe 2 O 3 , and semi-coke powder using thermodynamic modeling with Factsage 8.3 software. The phase composition and microstructure of the resulting products under varying semi-coke contents and sintering temperatures were characterized using X-ray diffraction (XRD) and scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS). Total Fe and S contents were quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES) and a C/S Analyzer. The results indicate that increasing the semi-coke content from 11.11 wt% to 20.00 wt% leads to an initial rise and subsequent decline in CaFe 2 O 4 yield, while S content exhibits an opposite trend. Similarly, elevating the sintering temperature from 1050°C to 1150°C results in increased CaFe 2 O 4 formation up to 1125°C, beyond which a decrease is observed, alongside a continuous reduction in S content. Optimal synthesis conditions were identified at 15.79 wt% semi-coke and 1125°C, achieving a desulfurization rate of 95.40 % and confirming effective formation of CaFe 2 O 4 . Compared to conventional reducing agents such as coke and C powders, the use of semi-coke enabled a reduction in the required sintering temperature from 1150°C to 1125°C. These results provide a valuable reference for the low-temperature, high-efficiency recycling of desulfurized gypsum into functional ferrite materials.
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COMBUSTION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.5
Baichen Chen,Yi Wang,Jianchen He,Xiaolan Song,Chongwei An
This article uses a combination of experimental and simulation methods for mutual verification to explore the possibility of nano aluminum thermite damaging chips and disrupting circuit systems. In terms of experiments, Fe2O3/SiO2/Al and SnO2/SiO2/Al aluminum thermites were prepared by physically mixing micro Al powder, nano SiO2, and nano metal oxide powder in a certain proportion. The binder was added and pressed into a charge column for ignition testing. The prepared aluminum thermite was characterized and its performance was tested using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy(XPS), and constant pressure combustion experiments.In terms of molecular dynamics simulation, Materials Studio software was used to investigate the interaction relationships between atoms in the aluminum thermite. The reaction process and properties of the aluminum thermite under adiabatic conditions at different initial temperatures were explored from the perspectives of potential energy, radial distribution function, mean square displacement, and self diffusion coefficient. The simulation results were compared with experimental reaction phenomena. The results show that the aluminum thermite prepared by physical method is uniformly mixed, various materials are fully adhered, well dispersed, and there is no agglomeration phenomenon. In terms of combustion performance, the overall performance of Fe2O3/SiO2/Al thermite is better than that of SnO2/SiO2/Al thermite, with higher combustion efficiency, higher reaction temperature, and the ability to maintain high temperature for a longer period of time. The combustion of Fe2O3/SiO2/Al aluminum thermite is more complete, and the reaction generates more elemental Si, which plays a positive role in the damage of chips. In terms of molecular dynamics simulation, the aluminum thermal reaction of Fe2O3/SiO2/Al at different initial temperatures is more stable, with a faster energy release rate and a higher total energy content than SnO2/SiO2/Al. The aluminum thermal reaction generates oxides of elemental Fe/Sn, Si, and Al. Overall, the diffusion coefficients of both aluminum thermites increase with the increase of initial temperature, and the intensity of the reaction also increases with the increase of initial temperature. Temperature has an accelerating effect on their diffusion, and SnO2/SiO2/Al has stronger diffusion ability than Fe2O3/SiO2/Al. The Fe2O3/SiO2/Al aluminum thermite has a better damage effect on chips, and the simulation and experimental results are consistent.
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Journal of Nanostructure in Chemistry
·
2022
·Vol. 13
·期 6
·577-589
·
IF 8
Tian Ruonan,Gao Zeyuan,Lang Ruifeng,Li Na,Gu Huilin,Chen Gang,Guan Hongtao,Comini Elisabetta,Dong Chengjun
Lately novel strategies to enhance the sensing properties on iron oxide have been proposed to achieve high performance gas sensors for acetone detection. In this working report, the synthesis of iron-glycerate (Fe-Gly) using glycerol to combine with Fe 3+ is first presented. Depending on the thermal treatment, this compound can evolve into γ-Fe 2 O 3 , α/γ-Fe 2 O 3 and α-Fe 2 O 3 . α/γ-Fe 2 O 3 shows better sensing performance as far as acetone detection is concerned. Using the dual phases of α/γ-Fe 2 O 3 as a fundamental building block, their sensing properties were further improved using Ni doping and Ru nanoparticles functionalization. The high response and selectivity to acetone detection was ascribed to the synergistic effects of unique nanosheets, mixed phases, rich oxygen vacancies and excellent catalytic activity of Ru nanoparticles. Graphical abstract
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2020
·Vol. 37
·期 4
·623-632
·
IF 2.69
Yan Zhinan,Kang Yong,Li Dan,Liu Yu Chun
Hematite (α-Fe 2 O 3 ) is a promising alternative to the catalysts currently used due to its low cost, fairly good activity and environmentally friendly properties. In this study, α-Fe 2 O 3 /SiO 2 nanocatalysts promoted with cobalt and cerium (Co 3 O 4 -CeO 2 -α-Fe 2 O 3 /SiO 2 ) were prepared via wet co-impregnation method, and the effects of promoters on catalytic performances for SO 2 oxidation at different temperatures, SO 2 concentrations, cycle numbers, catalytic stability as well as catalyst charging were investigated. The results indicated that SO 2 conversion rose with the increasing of catalyst charging and SO 2 concentration. Also, the as-prepared catalyst had the maximum SO 2 conversion at the reaction temperature of 500 °C, excellent catalytic recyclability and activity stability. Its physicochemical and redox properties were characterized by XRD, BET, SEM, FT-IR and XPS. The results of XRD and FT-IR spectra confirmed that the formation of Ce 2 FeO 4 network in the Co-Ce co-doped catalysts proved the promoting effect of cerium on higher valence state of the active ingredient. The N2 adsorption/desorption results evidenced that cerium could increase the proportion of mesoporous, and the XPS spectra indicated that cobalt and cerium in the catalysts could increase the available oxygen (O β /O α ) for the redox reaction. Due to its excellent low onset temperature, fairly good activity and environmentally friendly properties, the as-prepared catalyst of Co 3 O 4 -CeO 2 -α-Fe 2 O 3 /SiO 2 appeared to be more efficient for the SO 2 conversion in a large concentration range.
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Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Mo Qiu,Ruoqing Wang,Xinhua Qi
This paper reports a method of controllable synthesis of hollow polyhedral α-Fe 2 O 3 using H 3 btc and HF as additives. Three products with different morphologies were obtained by only adjusting the ratio of H 3 btc: HF. The as-prepared products were characterized using XRD, TG-DSC, FT-IR, Zeta potential analysis, UV, SEM and TEM. The characterization results reveal that H 3 btc is the key factor in preparing a hollow structure, and HF is vital to form a polyhedral morphology. On the basis of the time-dependent experiments, a probable growth mechanism of α-Fe 2 O 3 was proposed. Finally, the resulting hollow polyhedral α-Fe 2 O 3 exhibit good photocatalytic degradative ability for rhodamine B (RhB) molecules in water under visible light irradiation.
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RSC Advances
·
2019
·Vol. 9
·期 18
·10272-10281
·
IF 3.049
Yide Xia,Ying Liu,Nannan Shi,Xungao Zhang
In this article, the catalyst Au/γ-Fe2O3@hydroxyapatite (Au/γ-Fe2O3@HAP) consisting of Au nanoparticles supported on the core–shell structure γ-Fe2O3@HAP was prepared through a deposition–precipitation method. The catalyst was characterized by transmission electron microscopy, X-ray powder diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, N2 adsorption–desorption and atomic absorption spectrometry. The as-prepared Au/γ-Fe2O3@HAP exhibited excellent performance for the reduction of 4-nitrophenolate (4-NP) to 4-aminophenolate (4-AP) in the presence of NaBH4 at room temperature. Thermodynamic and kinetic data on the reduction of 4-NP to 4-AP catalyzed by the as-prepared catalyst were studied. The as-prepared catalyst could be easily separated by a magnet and recycled 6 times with over 92% conversion of 4-NP to 4-AP. In addition, the as-prepared catalyst showed excellent catalytic performance on other nitrophenolates. The TOF value of this work on the reduction of 4-NP to 4-AP was 241.3 h−1. Au/γ-Fe2O3@HAP might have a promising potential application on the production of 4-AP and its derivatives.
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高影响因子
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