JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2020
·
IF 5.647
Yang Wang,Pengcheng Gao,Yingying Wei,Yajin Jin,Si Sun,Zhifei Wang,Yong Jiang
A facile and cost-effective preparation of silver nanoparticles decorated magnetic composite for the effective catalytic degradation of 4-nitrophenol (4-NP) and Methylene blue (MB) and Rhodamine B (RhB) was investigated. Fe 3 O 4 @Polystyrene@Ag (Fe 3 O 4 @PS@Ag) catalyst was prepared via a two-step procedure. Firstly, carboxyl groups modified magnetic microspheres (Fe 3 O 4 @PS-COOH) has been successfully synthesized by microemulsion polymerization. Then Ag ions were adsorbed and in-situ reduced on the surface of Fe 3 O 4 @PS microspheres . To estimate the catalytic activity of Fe 3 O 4 @PS@Ag catalyst, the reduction experiments of MB, RhB and 4-NP were performed in the presence of NaBH 4 . The results indicated that Fe 3 O 4 @PS@Ag catalyst has a good catalytic performance and these dyes can be reduced in a very short time, which the apparent rate coefficients are 0.0089 s −1 , 0.0187 s −1 and 0.0086 s −1 for MB, RhB and 4-NP respectively. In addition, it could be easily collected from aqueous solution by a magnet so that the catalyst could be recovered and reused after the catalytic process. The catalytic activity was still high after seven cycles. This catalytic reaction is in agreement with the pseudo-first-order kinetic equation . Furthermore, the as-prepared Fe 3 O 4 @PS@Ag catalyst outperforms other catalysts in the degradation of these organic dyes.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2019
·Vol. 53
·期 5
·055504
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IF 2.829
Shixin Wei,Qiong Fu,Yang Liu,Qian Ji,Yafei Hou,Laihui Luo,Weiping Li
An enhanced energy storage ability, under a low operating electric field, was achieved in Fe3O4@TiO2-P(VDF-HFP) composite films. The low conductivity TiO2 layer was coated onto the high polarization Fe3O4 to construct Fe3O4@TiO2 core–shell fillers for decreasing filler fraction and alleviating conductivity contrast. For instance, the 2 vol.% Fe3O4@TiO2-P(VDF-HFP) film shows a discharged energy density and energy efficiency of 8.6 J cm−3 and 61.7%, respectively, under a low operating electric field of 261.9 kV mm−1. The coated TiO2 and modified –OH groups not only restrict the adverse effects (such as high conductivity, easy agglomeration, etc) caused by Fe3O4, but also contribute greatly to the improvement of polarization and breakdown strength, leading to a significantly improved energy storage performance. Additionally, the present work might possess great potential applications for energy storage owing to the low filler fraction, simple, and low electric filed operation.
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JOURNAL OF CHROMATOGRAPHY A
·
2012
·
IF 4.531
Qin Zhao,Fang Wei,Neng Xiao,Qiong-Wei Yu,Bi-Feng Yuan,Yu-Qi Feng
In the present work, we developed a novel dispersive microextraction technique by combining the advantages of liquid-phase microextraction (LPME) and magnetic solid-phase extraction (MSPE). In this method, trace amount of water directly absorbed on bare Fe 3 O 4 to form water-coated Fe 3 O 4 (W-Fe 3 O 4 ) and rapid extraction can be achieved while W-Fe 3 O 4 dispersed in the sample solution. The analyte adsorbed W-Fe 3 O 4 can be easily collected and isolated from sample solution by application of a magnet. It was worth noting that in the proposed method water was used as extractant and Fe 3 O 4 served as the supporter and retriever of water. The performance of the method was evaluated by extraction of 3-monochloropropane-1,2-diol (3-MCPD) from edible oils. The extracted 3-MCPD was then derived by a silylanization reagent (1-trimethylsilylimidazole) before gas chromatography–mass spectrometry (GC–MS) analysis. Several parameters that affected the extraction and derivatization efficiency were investigated. Our results showed that the limit of detection for 3-MCPD was 1.1 ng/g. The recoveries in spiked oil samples were in the range of 70.0–104.9% with the RSDs less than 5.6% (intra-day) and 6.4% (inter-day). Taken together, the simple, rapid and cost-effective method developed in current study, offers a potential application for the extraction and preconcentration of hydrophilic analytes from complex fatty samples.
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FUEL
·
2025
·
IF 7.5
Xiao Xia,Jun Ma,Zongjing Lu,Haifeng Cong,Xingang Li
This study aims to address the issue of efficient demulsification of water-in-heavy oil emulsions (W/HO-Es) in the petroleum industry. Herein, the novel amphiphilic polymer-modified superparamagnetic Fe 3 O 4 NPs (ap-Fe 3 O 4 ) were prepared using interface engineering strategies. The ap-Fe 3 O 4 nanoparticles prepared have an average particle size of 9.52 nm. Its surfaces are rich in various polar groups (such as carboxyl, hydroxyl, and amino groups), which significantly enhance their surface polarity. The ap-Fe 3 O 4 NPs exhibit ultra-high demulsification efficiency for interfacially active asphaltenes (IAA)-stabilized W/HO-Es. Experimental results demonstrated that ap-Fe 3 O 4 could completely remove water from W/HO-Es at 2000 ppm within 30 s at room temperature, achieving a demulsification efficiency of 100 %. Microscopic visual characterization and multi-scale theoretical calculations reveal that the outstanding demulsification performance of ap-Fe 3 O 4 is due to the “surface polarity enhanced hydrogen bond reconstruction” effect at the heavy oil–water interface. This enhancement allows ap-Fe 3 O 4 , with its high interfacial activity, to effectively disrupt the hydrogen bonds and π-π stacking of IAA at the heavy oil–water interface. This disruption breaks down the IAA films, promotes the coalescence and aggregation of water molecules, and ultimately achieves efficient demulsification of W/HO-Es. This research provides a new approach for regulating the surface hydrogen bonding of magnetic Fe 3 O 4 NPs and establishes a solid theoretical foundation for the further development of revolutionary new magnetic demulsification materials.
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Analytical Methods
·
2021
·Vol. 13
·期 19
·2209-2214
·
IF 2.896
Yuan Yao,Guoming Xie,Xin Zhang,Jinshan Yuan,Yulei Hou,Hui Chen
Biosensors based on nanomaterials are becoming a research hotspot for the rapid detection of pathogenic bacteria. Herein, a “turn-on” fluorescent biosensor based on a FRET system was constructed for the fast detection of a representative pathogenic microorganism, namely, E. coli, which causes most urinary tract infections. This biosensor was constructed by utilizing synthesized UCNPs as fluorescent donors with stable luminescence performance in complex biological samples and GO@Fe3O4 as a receptor with both excellent adsorption ability and fluorescence quenching ability. A specific ssDNA selected as an aptamer which could recognize E. coli was immobilized on the UCNPs to form UCNP-Apt nanoprobes. The nanoprobes were adsorbed on the surface of GO@Fe3O4 through the π-stacking interactions between aptamers and GO. In the presence of E. coli, UCNP-Apt nanoprobes detached from GO@Fe3O4 due to the specific recognition of aptamers and bacteria, resulting in obvious fluorescence recovery, and the concentration of bacteria was positively correlated with the intensity of the fluorescence signal; such a “turn-on” signal output mode ensures excellent precision. In addition, the easy magnetic separation of GO@Fe3O4 simplifies the operation process, helping the sensor detect bacteria in 30 minutes with a linear range from 103 to 107 CFU mL−1 and a limit of detection of 467 CFU mL−1. Moreover, recovery test results also showed that the sensor has clinical application potential for the rapid detection of pathogenic microorganisms in complex biological samples.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Yuzhao Hou,Binyan Yang,Simon Sani Ocholi,Fengchao Wang,Zhifei Fu,Liming Wang,Lifeng Han,Pengli Du,Jia Zhao,Ping He,Zixin Zhang,Erwei Liu
Estrogen compounds in food exhibit bioaccumulation and endocrine-disrupting effects, posing serious risks to ecosystems and human health. Here, a novel core–shell magnetic covalent organic framework (COFs @ Fe 3 O 4 @C NPs) was developed for efficient enrichment and sensitive detection of estrogens in meat samples. The adsorption feasibility and mechanism of TAPB-DVA-COF were investigated using density functional theory (DFT) and molecular dynamics simulation (MDS). DFT calculations confirmed that hydrogen bonding and π–π stacking drive spontaneous adsorption, with adsorption energies ranging from −21.26 to −11.59 kcal mol −1 . MDS further revealed the formation of stable estrogen-COF complexes through close interfacial contact and persistent hydrogen bonding, confirming the existence of low-energy conformations. Based on these insights, COFs were anchored onto polydopamine-modified carbon-coated Fe 3 O 4 nanoparticles at room temperature to fabricate a magnetic adsorbent, which was then employed as a magnetic solid-phase extraction (MSPE) material. The adsorbent exhibited high surface area, strong magnetic responsiveness, and excellent stability. Coupled with high-performance liquid chromatography (HPLC), the established MSPE–HPLC method achieved a wide linear range ( R ≥ 0.9996) and low detection limits (0.21–12.79 μg L −1 ). In pork and chicken samples, recoveries ranged from 91.7 % to 113.5 % with relative standard deviations of 1.0–6.1 %. This study demonstrates the superior performance of COFs @ Fe 3 O 4 @C NPs for estrogen detection and highlights MDS as an efficient and economical tool for predicting adsorption behavior, offering valuable guidance for material design.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
·
IF 4.1
Yonghui Li,Guihong Gao,Tian Han,Jingjing Ruan,Shenshen Li,Hailin Fan,Ziqiang Niu,Tongfei Wang,Shengjie Liang,Feng Huo
Lithium-sulfur batteries are regarded as promising alternatives for next-generation energy storage systems. Developing high-performance lithium-sulfur battery cathode materials requires the efficient synthesis of electrocatalysts that can both anchor LiPS and catalyze their conversion. Herein, we synthesized a composite of ionic liquid-derived nitrogen-doped carbon-coated Fe 3 O 4 loaded on graphene (Fe 3 O 4 @NC/G) by utlizing the π-π interaction between [Bmim][FeCl 4 ] and graphene. Fe 3+ ions were uniformly dispersed, effectively preventing particle aggregation during the carbonization process and producing Fe 3 O 4 nanoparticles averaging 20.64 nm in size. This structure provides plentiful active sites for adsorbing and catalyzing LiPS, thereby accelerating the redox reaction. Additionally, the nitrogen-doped carbon coating not only stabilizes the Fe 3 O 4 nanoparticles and firmly anchors them to the graphene nanosheets , significantly enhancing structural integrity, but also increases the adsorption of LiPS due to the introduction of the heteroatom nitrogen. The assembled LSBs demonstrated excellent cyclic stability with a capacity fade rate of 0.35 % per cycle over 1200 cycles at 1C.
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CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Maonan Ran,Guan Zhang
The NO 3 − electroreduction process presents a promising alternative to the Haber-Bosch method by offering dual benefits: removal of nitrates from wastewater coupled with efficient NH 3 production. Herein, Mo and S doped Fe 3 O 4 nanoplates grown on foam Fe (Mo-S-Fe 3 O 4 @FF) with electron-rich Mo δ+ state was synthesized through a facile hydrothermal approach. Notably, Mo-S-Fe 3 O 4 @FF electrode achieved a nearly fourfold enhancement in ammonium yield compared to foam Fe electrode, while also enhancing the NH 3 Faradaic efficiency. At − 1.3 V vs . Ag/AgCl in a K 2 SO 4 + KNO 3 solution, the Mo-S-Fe 3 O 4 @FF electrode attained a NH 3 Faradaic efficiency of 91.3 %. Furthermore, performance was observed to improve with increasing solution pH levels as the reaction proceeded. From both kinetic and thermodynamic perspectives, our findings demonstrate that high NH 3 production activity is characteristic of Mo-S-Fe 3 O 4 @FF—indicating significant enhancements in conversion rates from NO 3 − →NO 2 − →NH 3 . Theoretical calculation, in conjunction with experimental analyses, reveal that the co-modification of Fe 3 O 4 with Mo and S enhances electron transfer capacity during NO 3 − RR. This modification forms Lewis-acid (Fe-Mo) pairs that increase nitrate adsorption energy alongside Lewis-base (S-O) sites that attract protons, thereby improving overall NO 3 − RR activity. This report elucidates the synergistic effects of Lewis-acid and Lewis-base sites on optimizing catalytic performance for NO 3 − RR using foam Fe-based electrodes.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2012
·
IF 3.456
Qiuhua Wu,Cheng Feng,Chun Wang,Zhi Wang
A superparamagnetic graphene–Fe 3 O 4 nanocomposite (G/Fe 3 O 4 ) was synthesized by a facile one-pot solvothermal method. The nanocomposite G/Fe 3 O 4 prepared by the new method was firstly used as an adsorbent to remove dye for water pollution remediation. In comparison with G/Fe 3 O 4 prepared by the in situ chemical coprecipitation, the newly prepared G/Fe 3 O 4 had a higher adsorption efficiency for the dye. The adsorption characteristics of the nanocomposite adsorbent were examined using the organic dye pararosaniline as the adsorbate. The adsorption kinetics, adsorption capacity of the adsorbent, and the effect of the adsorbent dosage and solution pH on the removal efficiency of pararosaniline were investigated. The adsorption capacity of G/Fe 3 O 4 for pararosaniline was evaluated using the Freundlich and Langmuir adsorption isotherm models. The G/Fe 3 O 4 hybrid composite can be easily manipulated in magnetic field for desired separation, leading to an easy removal of the dye from polluted water. The G/Fe 3 O 4 hybrid composite would have a great potential in removing organic dyes from polluted water.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 17
·9533-9545
·
IF 3.049
Chaoyang Jia,Junhong Zhao,Liling Lei,Xiyang Kang,Ran Lu,Chongtao Chen,Shunling Li,Yale Zhao,Qingxiang Yang,Zhijun Chen
In this paper, a novel adsorbent, Fe3O4@SiO2@PEI-NTDA, was first prepared by the immobilization of an amine and anhydride onto magnetic Fe3O4@SiO2 nanoparticles with polyethylenimine (PEI) and 1,4,5,8-naphthalenetetracarboxylic-dianhydride (NTDA) for the removal of heavy metal ions from aqueous solutions. The structure of Fe3O4@SiO2@PEI-NTDA was systematically investigated; the results confirmed that amine and anhydride groups were successfully covalently grafted onto the surface of Fe3O4@SiO2, which showed a homogenous core–shell structure with three layers of about 300 nm diameter (Fe3O4 core: 200 nm, nSiO2 layer: 20 nm, and PEI-NTDA layer: 20 nm). The adsorption performance of Fe3O4@SiO2@PEI-NTDA NPs was evaluated for single Pb2+ and coexisting Cd2+, Ni2+, Cu2+, and Zn2+ ions in an aqueous solution in a batch system. The amine and anhydride groups may have a synergistic effect on Pb2+ removal through electrostatic interactions and chelation; Fe3O4@SiO2@PEI-NTDA NPs exhibited preferable removal of Pb2+ with maximum adsorption capacity of 285.3 mg g−1 for Pb2+ at a solution pH of 6.0, adsorbent dosage of 0.5 g L−1, initial Pb2+ concentration of 200 mg L−1 and contact time of 3 h. The adsorption mechanism conformed well to the Langmuir isotherm model, and the adsorption kinetic data were found to fit the pseudo-second order model. Fe3O4@SiO2@PEI-NTDA NPs could be recovered easily from their dispersion by an external magnetic field and demonstrated good recyclability and reusability for at least 6 cycles with a high adsorption capacity above 204.5 mg g−1. The magnetic adsorbents showed high stability with a weight loss below 0.65% in the acid leaching treatment by 2 M HCl solution for 144 h. This study indicates that Fe3O4@SiO2@PEI-NTDA NPs are new promising adsorbents for the effective removal of Pb2+ in wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Zhenzhen Yang,Renliang Huang,Wei Qi,Liping Tong,Rongxin Su,Zhimin He
Reduced graphene oxide functionalized with magnetic Fe 3 O 4 nanoparticles and –PhSO 3 H groups (Fe 3 O 4 -RGO-SO 3 H) was reported for environmentally benign hydrolysis of cellulosic materials, which is an important process in integrated utilization of biomass resource. Except for –PhSO 3 H groups, –COOH and –OH groups derived from graphene oxide (GO) were also expected in the structure of Fe 3 O 4 -RGO-SO 3 H. Fe 3 O 4 -RGO-SO 3 H exhibited outstanding catalytic performance for the hydrolysis of cellulosic materials, due to its crumpling feature with clear layers and the coexistence of –COOH and –OH groups. The unique structure of Fe 3 O 4 -RGO-SO 3 H favors the accessibility of cellulose to the active sites of the material and facilitates the diffusion of the product molecules. –COOH groups on the surface of the material provide a large concentration of acidic functionality for hydrolyzing cellulose, while –OH groups readily adsorb cellulose through forming strong hydrogen bonds between –OH groups and the oxygen atoms in β-1,4 glycosidic bonds. Furthermore, Fe 3 O 4 -RGO-SO 3 H can also be easily separated from the reaction residue with an extra magnetic force and further used at least five times.
研究领域:
材料化学
·
催化化学
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生物质能源
·
绿色化学
·
纳米材料科学
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2026
·
IF 6.9
Song song,Yihe Qin,Rui Yuan,Xiaoman Li,Yuancai Chen,Haiming Huang
Background The persistence and eutrophication risks posed by organophosphorus pollutants and P recovery have attracted great concern. To overcome the narrow pH window and poor Fe 2+ /Fe 3+ cycling of conventional Fenton processes for the decontamination of organophosphorus effluents, a novel heterogeneous fenton process is required. Methods Herein, a Fe 3 O 4 -modified tourmaline composite (Fe 3 O 4 @Tol) was prepared via hydrothermal reaction and a heterogeneous photo-Fenton system was established with UV assistance. Significant Findings The composite achieved 89.97% conversion rate of 1-hydroxyethylidene-1,1-diphosphonic acid(HEDP) within 10 min with >80% TOC removal under neutral conditions (pH=7). Density-functional theory calculations and mechanistic investigations revealed that the piezoelectric effect of tourmaline promotes H₂O₂ dissociation and electron transfer, while UV irradiation accelerates Fe³⁺/Fe²⁺ cycling and H₂O₂ decomposition. These synergistic effects elevated H₂O₂ utilization efficiency to 81.18%. The system rapidly degraded other organophosphorus compounds (phytic acid, nitrilotrimethylene triphosphonic acid) and tolerated common inorganic salts, maintaining conversion rates above 70%. Fe 3 O 4 @Tol retained 72.21% of its initial activity after five cycles. This pH-tolerant, recyclable, and highly efficient technology offers a promising solution for the removal of recalcitrant organophosphorus pollutants from industrial wastewater.
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危险品化学品经营许可证（带存储）