APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Qiusheng Peng,Hongying Zhao,Lin Qian,Yanbin Wang,Guohua Zhao
A novel three-dimensional ordered macroporous Fe 2 O 3 /CA cathode (3DOM–Fe 2 O 3 /CA) was fabricated by using self-assembled colloidal crystal template and proposed in solar photo-electro-Fenton (SPEF) process at neutral pH. 3DOM–Fe 2 O 3 /CA possessed 3D-ordered interconnecting marcopores (390–425 nm) with a hollow “cylindrical tube” in the vertical direction. Compared to the traditional Fe 2 O 3 /CA electrode, the 3DOM–Fe 2 O 3 /CA presented higher photocatalytic and Fenton oxidation ability. The interconnecting macropores generated multiple scattering and slow-photon effect for increasing light harvesting efficiency, while the nice channels minimized tortuosity and provided much more efficient mass transport. Almost complete removal of 200 mg L −1 imidacloprid was achieved in 2.5 h with 3DOM–Fe 2 O 3 /CA. The dynamic analysis showed that the degradation of imidacloprid follows the pseudo-first order reaction. The apparent rate constant for 3DOM–Fe 2 O 3 /CA electrode is 0.326 h −1 , which 2 times higher than that of reference Fe 2 O 3 /CA electrode. The energy consumption was used more effectively in SPEF with 3DOM–Fe 2 O 3 /CA. EPR and radical trapping experiments revealed that the OH radicals were main oxidants in SPEF system and 3D-ordered macroporous favored the formation of OH. Besides, 3DOM–Fe 2 O 3 /CA electrode presented very low iron leaching (<1 ppm) and retained high catalytic activity after consecutive runs.
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Materials Science & Engineering C-Materials for Biological Applications
·
2015
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IF 3.088
Feng Gao,Delun Zheng,Hidekazu Tanaka,Fengping Zhan,Xiaoning Yuan,Fei Gao,Qingxiang Wang
A highly sensitive electrochemical sensor for gallic acid (GA), an important polyphenolic compound, was fabricated using the hybrid material of chitosan (CS), fishbone-shaped Fe 2 O 3 (fFe 2 O 3 ), and electrochemically reduced graphene oxide (ERGO) as the sensing matrix. The electrochemical characterization experiments showed that the CS–fFe 2 O 3 –ERGO modified glassy carbon electrode (CS–fFe 2 O 3 –ERGO/GCE) had large surface area, excellent electronic conductivity and high stability. The GA presented a superior electrochemical response on CS–fFe 2 O 3 –ERGO/GCE in comparison with the single-component modified electrode. The electrochemical mechanism and optimal test conditions of GA on the electrode surface were carefully investigated. Under the optimal conditions, the oxidation peak currents in differential pulse voltammetry (DPV) experiments exhibited a good linear relationship with the logarithmic values of GA concentration over the range from 1.0 × 10 − 6 M to 1.0 × 10 − 4 M. Based on signal-to-noise (S/N) characteristic of 3, the detection limit was estimated to be 1.5 × 10 − 7 M. The proposed sensor has also been applied for estimating the antioxidant capacity index of real samples of red and white wines.
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MICROCHEMICAL JOURNAL
·
2024
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IF 4.9
Mingcai Yao,Guang Luo,Yifan Ran,Chenyang Li,Liang Dong
A chloramphenicol (CAP) electrochemical sensor based on zinc tungstate and magnetic hematite (ZnWO 4 /γ-Fe 2 O 3 ) magnetic molecularly imprinted polymer (ZnWO 4 /γ-Fe 2 O 3 /MIP) is proposed. First, ZnWO 4 , γ-Fe 2 O 3 nanomaterials were synthesized by one-step hydrothermal method, and then ZnWO 4 , magnetic nanoparticles were combined with molecularly imprinted polymers, that is, ZnWO 4 /γ-Fe 2 O 3 was coated with a molecularly imprinted (MIP) shells by precipitation polymerization method to prepare magnetic molecularly imprinted nanomaterials, and then modified on glassy carbon electrodes to construct an electrochemical sensor for the determining of CAP. The results show that under the optimal conditions, the ZnWO 4 /γ-Fe 2 O 3 /MIP (MMIP) modified electrode has a stronger CAP detection reduction peak current than the one-component electrode, and exhibits better electrocatalytic activity, which is an excellent electrochemically modified electrode. Compared to magnetic non-molecular imprint sensors (MNIP), MMIP sensors have higher detection efficiency. The linear range of ZnWO 4 /γ-Fe 2 O 3 /MIP/GCE for the detection of CAP was 0.12 ∼ 1224 μM, and the detection limit was 0.034 μM, showing excellent stability and reproducibility, and good selectivity in the presence of different interferences. ZnWO 4 /γ-Fe 2 O 3 /MIP/GCE was applied to the detection of CAP in milk samples with satisfactory results.
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ACS Sustainable Chemistry & Engineering
·
2024
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IF 7.1
Jitong Deng,Yanan Zhang,Hongjing Han,Yongjun Zhang,Haiying Wang,Xuzhong Gong,Yanguang Chen
The chemical looping conversion of CH4 has been one of the most promising technologies for achieving the “two-carbon” strategy. Fe2O3 oxygen carrier cannot maintain the excellent release performance of lattice oxygen at high temperature due to the sintering and carbon deposition. Therefore, quaternary La1–xSrxFe1–y CoyO3 perovskite was selected as the transfer support of oxygen ions. By using the MOF precursor method, ternary La0.8Sr0.2FeO3 was prepared via the introduction of metal Sr into the binary LaFeO3. The adsorption energy of CH4 on the La0.8Sr0.2FeO3 was the lowest (−0.054 eV), compared with separate Fe2O3 and LaFeO3, and the adsorption energy of free H at the adjacent Fe site was the lowest (1.650 eV). Furthermore, the La1–xSrxFe1–yCoyO3 perovskite was successfully synthesized by the doping of Co into the ternary La0.8Sr0.2FeO3. La0.8Sr0.2Fe0.8Co0.2O3 was chosen to composite Fe2O3 oxygen carrier. As m(Fe2O3):m(La0.8Sr0.2Fe0.8Co0.2O3) = 1:1, the lattice oxygen conversion rate was less than 47% and the selectivity of CO2 reached 99.5% through the synergistic effect of lattice oxygen and oxygen vacancies. Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 increased the lattice oxygen conversion by 17.6%, compared with Fe2O3–La0.8Sr0.2FeO3. After the CH4 chemical looping conversion cycles five times, Fe2O3–La0.8Sr0.2Fe0.8Co0.2O3 still had favorable structural stability and oxidation performance, and the lattice oxygen conversion rate still reached >95%.
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Progress in Natural Science-Materials International
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2024
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IF 4.8
Mengxia Ma,Zhaoyang Li,Xu Yan,Yanli Mao,Chaohai Wang,Haiyan Kang,Qun Yan,Jieqiang Zhou,Zhongxian Song,Dandan Pang
Magnetic flower-like α-Fe 2 O 3 @N–C particles were synthesized by hydrothermal self-assembly method and oxygen-limited carbonisation in a glycerol and ethanol solution system using glucose as the carbon source, iron nitrate as the magnetic source and particle skeleton and urea as the nitrogen source. Four hydrothermal temperatures of 120 °C, 140 °C, 160 °C and 180 °C were used to modulate the adsorbent structure. Hydrothermal temperature of 140 °C, solution pH = 7, and a dosage of 0.06 g are the optimum conditions. The adsorption capacity of 2,4-dichlorophenol (2,4-DCP) onto MC-2 was determined as 108.556 mg g −1 at 25 °C. Experiments show that the adsorbents all fitted well to the Langmuir isothermal adsorption model and the quasi-secondary kinetic model, and the adsorption behaviour was dominated by monolayer chemisorption . The adsorption process was heat absorbing and spontaneous. Raman and XRD analysis showed that the adsorbent had a stable α-Fe 2 O 3 skeleton and carbon layers. FTIR and XPS analysis showed that the adsorbent had hydrogen bonding , electrostatic interaction and π-π bonding to 2,4-dichlorophenol.
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JOURNAL OF FOOD SCIENCE
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2024
·Vol. 89
·期 5
·2879-2894
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IF 3.2
Mahsa Kheirandish,Majid Javanmard dakheli,Maryam Mizani,Alireza Salehirad
The aim of this study was the synthesis of bimetallic nanoparticles based on Fe 2 O 3 /TiO 2 and its use in the poly(lactic acid) (PLA) films as an oxygen scavenger in extra virgin olive oil (EVOO) packaging. Bimetallic nanocomposites were prepared by two different precipitation methods (precipitation with ammonia and sodium hydroxide). The characteristics of bimetallic nanoparticles precipitated with sodium hydroxide (Na-Ti 0.01 Fe 0.048 O 0.08 ) and bimetallic nanoparticles precipitated with ammonia (NH-Ti 0.01 Fe 0.022 O 0.09 ) were compared. Relative amounts of elements in bimetallic nanocomposites and their morphological characteristics were determined using field emission scanning electron microscopy coupled with energy-dispersive X-ray spectrometer. Porosity volume and surface area of bimetallic nanoparticles were calculated using adsorption–desorption isotherms and the Brunauer–Emmett–Teller method. The formation/characterization of bimetallic nanoparticles and their location in the matrix of PLA-based nanocomposite film was studied using X-ray diffraction and Fourier transform infrared. In nanocomposite films based on PLA, bimetallic nanoparticles lead to better oxidative stability (peroxide value, p -anisidine index, K 232 , and K 270 ) of the EVOO and oxygen scavenging during storage compared to free nanoparticles. Mechanical properties of nanocomposite films were improved due to bimetallic nanoparticles, which were better for Na-Ti 0.01 Fe 0.048 O 0.08 . In vitro release modeling of the bimetallic nanoparticles in EVOO proved that Fickian diffusion is the dominant mechanism, and the Peleg model was the best description of the release behavior of nanoparticles.
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APPLIED BIOCHEMISTRY AND MICROBIOLOGY
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2024
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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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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Xinyi Liu,Wen Guo,Xiaoshi Cheng,Zhicheng Wei,Qian Feng,Song Cheng,Qin Zhang,Jingyang Luo
Various exogenous contaminants typically coexist in waste activated sludge (WAS), and the long-term impacts of these co-occurring contaminants on WAS anaerobic fermentation and associated mechanisms remain largely unknown. This study reveals that the co-occurrence of surfactants and nanoparticles (NPs, i.e. , Fe 2 O 3 and CeO 2 , frequently detected in sludge) exhibited time-dependent impacts on the volatile fatty acids (VFAs) biosynthesis. Surfactants triggered WAS decomposition and enhanced NPs dispersion, leading to increased exposure of functional anaerobes to NPs toxicity, negatively affecting them. Consequently, key fermentation processes, acidogenic bacterial abundance, and metabolic functions were inhibited in co-occurrence reactors compared to those containing only surfactants in the early stage (before 56 d). Surprisingly, the fermentation systems containing surfactants collapsed subsequently, with VFAs yield at 72 d decreasing by 48.59–71.27 % compared to 56 d. The keystone microbes ( i.e. , Acidobacteria (16 d) vs Patescibacteria (56 d)) were reshaped, and metabolic traits ( i.e. , proB involved in intracellular metabolism) were downregulated by 0.05–78.02 % due to reduced microbial adaptive capacity ( i.e. , quorum sensing (QS)). Partial least squares path modeling (PLS-PM) analysis suggests that the microbial community was the predominant factor influencing VFAs generation. This study provides new insights into the long-term effects of co-contaminants on the biological treatment of WAS.
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VACUUM
·
2024
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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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Materials Horizons
·
2025
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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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ACS Applied Nano Materials
·
2025
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IF 5.5
Xiaowei Ma,Lin Tan
Metal–organic frameworks (MOFs)-derived compounds exhibit tremendous potential for applications in the field of microwave absorption, attributed to their unique structural characteristics, high specific surface area, and tunable magnetic and dielectric properties. However, their practical application in the microwave absorption field is limited by poor impedance matching. To address this issue, we successfully synthesized a composite microwave-absorbing material, labeled as Fe/Fe2O3/C/N,SGPE, by introducing heteroatom (N and S) codoped graphene (labeled as N,S-GPE) into an Fe/Fe2O3/C MOF derivative and employing a solvothermal method followed by subsequent pyrolysis. The introduction of N and S codoped graphene introduces defects and disordered structures, thereby enhancing interface and dipolar polarization processes, which in turn improve the dielectric properties and optimize impedance matching. The experimental results demonstrate that when the addition amount of N,S-GPE is 0.15 g, the material exhibits a maximum reflection loss of -62.8 dB at 7.6 GHz with a thickness of 3.09 mm, capable of absorbing over 99.9999% of microwaves. Consequently, this composite stands out as a promising candidate for high-efficiency microwave absorbers.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
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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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