JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Suci Meng,Shichao Sun,Yu Liu,Yikai Lu,Min Chen
Earth-abundant Fe-based oxides have drawn less attention in electrocatalytic water splitting owing to the inferior intrinsic activity and poor conductivity. Therefore, developing an effective method to increase the catalytic performance of Fe-based oxides is of great importance for the practical application. Herein, a novel Cr/N co-doped Fe 3 O 4 electrocatalyst (denoted as Cr-Fe 3 O 4 -N/NF) is designed and prepared by a simple immersion treatment followed by a calcination method for efficient water splitting. The resultant Cr-Fe 3 O 4 -N/NF shows significant catalytic activity for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with overpotentials of 218 and 95 mV at 10 mA cm –2 . Furthermore, the water splitting system using Cr-Fe 3 O 4 -N/NF could afford a current density of 10 mA cm –2 at 1.53 V, which is superior to two-electrode system composed of Pt/C and RuO 2 . The high activities are attributed to the synergistic effect between Cr and N element doping. Specifically, the introduction of electron-deficient Cr is conductive to accelerate the dissociation process of water, adsorption process of intermediates, adjust the electronic structure. Simultaneously, N doping can increase the adsorption of H intermediates, provide more active sites for hydrogen absorption, and improve the electrical conductivity. This study provides a new strategy for Cr and N co-doped metal oxides electrocatalysts for high-performance water splitting.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Huiwang Dai,Shuying Xu,Jianxin Chen,Xiaozeng Miao,Jianxi Zhu
Oxalate enhanced mechanism of Fe 3 O 4 @γ-Fe 2 O 3 was developed to provide novel insight into catalytic process regulation of iron oxide catalysts in heterogeneous UV-Fenton system. And the iron oxide composite of Fe 3 O 4 @γ-Fe 2 O 3 was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FTIR) spectroscopy and nitrogen adsorption-desorption isotherms. The results showed that large amount of iron could be leached from catalyst in the presence of oxalate, which promoted the homogeneous UV-Fenton reactions in solution. Orange II degradation could be significantly enhanced with the increase of the ratio of homogeneous UV-Fenton process to heterogeneous UV-Fenton process. The optimum concentration of oxalate determined by experiment was 0.5 mM in oxalate enhanced heterogeneous UV-Fenton system. On this condition, the pseudo-first-order rate constant value of Orange II degradation was 0.314 min −1 , which was 2.3 times as high as that in heterogeneous UV-Fenton system. The removal rates of color and TOC were 100% and 86.6% after 20 min and 120 min treatment, respectively. In addition, the iron ions in solution could be almost completely adsorbed back to the catalyst surface in later degradation stages of Orange II. During the recycle experiments, the results showed that the increase of pH in solution and the sorption of intermediates on the catalyst surface would hinder oxalate enhanced process and lead to a decrease of degradation rate of Orange II in oxalate enhanced heterogeneous UV-Fenton system.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 325
·期 2
·453-462
·
IF 1.137
Lu Shichao,Chang Shuquan,Li Zheng,Zhang Xiaohong,Hu Xiaodan,Zhang Haiqian
Magnetic Au/Fe 3 O 4 /poly(styrene-sodium styrene sulphonate) composite microspheres (Au/Fe 3 O 4 /P(St-NaSS) CMs) were successfully prepared via a gamma-radiation method. Au and Fe 3 O 4 were formed at the same time under irradiation and well dispersed on uniform P(St-NaSS) microspheres. The as-prepared CMs exhibit good catalytic properties and recyclable performances for the catalytic reduction of 4-nitrophenol (4-NP). The kinetic rate constants are 8.75 × 10 −3 s −1 and 7.71 × 10 −3 s −1 for two samples, respectively. The conversion rate of 4-NP can keep about 95% with catalysts after five cycles. They exhibit good magnetic behavior and have saturation magnetization value of about 9 emu g −1 , which can be easily separated from the solution under external magnetic field. This strategy is efficient and facile, which can be extended to fabricate other CMs.
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高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 8
·7197-7204
·
IF 1.5
Fanghua Zhu,Yuguang Wang,Yunwang Zhang,Wei Wang
Fe 3 O 4 supported on nitrogen-doped graphene was prepared by a facial one-pot hydrothermal method. The cyclic voltammetry, constant current charge and discharge, AC impedance and cycle times were tested in 1.0 mol/L Na 2 SO 4 aqueous solution. The results of electrochemical measurements show that the Fe 3 O 4 nanorings (NRs)/amine modified reduced grapheme oxide (NH 2 -RGO) composites have high capacitance, good conductivity, excellent ion diffusion behavior and strong stability. In neutral electrolyte, the specific capacitance measured under the current condition of 1.0 A/g was as high as 145 F/g, and the capacitance retention after the 1000-cycle constant-current charge-discharge test was 99.7%. Therefore, Fe 3 O 4 NRs/NH 2 -RGO composites have a good prospect as supercapacitor electrodes.
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高影响因子
Materials
·
2024
·Vol. 17
·期 12
·2838
·
IF 3.1
Liwei Xu,Guangdong Zhou
In this study, we synthesized Fe3O4nanoparticles (Fe3O4NPs) of varying sizes and morphologies using the solvothermal method and incorporated them as additives into carbonyl iron magnetorheological fluids (CI-MRFs). We tested the shear stress, yield stress, viscosity and storage modulus of the MRFs using a magnetorheometer to investigate how the size and morphology of Fe3O4NPs influence the performance of MRFs. Our results indicate that the size of the additive nanoparticles significantly enhances the MR properties of MRFs more than their morphological attributes. This enhancement results from optimizing and stabilizing the CI magnetic chain structure of the nanoparticles in the presence of a magnetic field. Specifically, MRFs with Fe3O4NPs averaging 250 nm in size exhibit higher yield stress and storage modulus and show increased resistance to shear strains. Although the nanoparticle morphology has a modest effect on the rheological properties of MRFs, hexahedral and octahedral particles can enhance rheological properties through increased internal friction compared to spherical particles. Additionally, Fe3O4NPs of different sizes and morphologies improve the sedimentation stability of MRFs, with those around 250 nm being particularly effective at slowing down sedimentation. Both hexahedral and octahedral Fe3O4NPs slow down sedimentation more effectively than spherical Fe3O4NPs. This paper investigates the rheological properties of CI-MRFs by controlling the additive particle size and morphological features, providing a research foundation for the design and optimization of MRFs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoyan Wu,Du Sun,Mi Li,Xiaowen Zhang,Naif Abdullah Al-Dhabi,Qi Fang,Wangwang Tang,Qiuyang Tang,Jie Kou,Ziyin Wang,Xue Zhang,Yilong Hua,Tao Cai
Microbial fuel cells (MFCs) have gained increasing attention in the field of uranium-containing wastewater (UCW) treatment as a self-powered bioelectrochemical system (BES) due to its advantages of recovering uranium resources and generating electricity. However, the lack of catalytic active sites on the carbon fiber cathode significantly hinders the reaction performance of surface electrons with uranium ions in solution, thereby limiting the application of MFC. In this study, we propose a carbon brush (CB) cathode modification process that utilizes cyclic voltammetry synthesis technique (CVS) to polymerize aniline (PA) on the surface of carbon fibers and uniformly load nano-Fe 3 O 4 particles (nFe 3 O 4 ). The loading of PA/nFe 3 O 4 not only significantly improve the catalytic active sites but also enhance the synergistic effect of adsorption and conductivity of CB cathode. Consequently, the nFe 3 O 4 /PA/CB-MFC showed excellent ability to continuous power generation and uranium separation. Over eight cycles of uranium separation, the nFe 3 O 4 /PA/CB-MFC exhibited an average maximum power density of 15.17 mW/m 2 and a uranium separation efficiency of 95.52 %, showcasing substantial enhancements by 2.10-fold and 1.44-fold compared to the CB-MFC, respectively. Our study presents an efficient approach to enhance the efficiency of uranium separation and boost power density of MFC by increase catalytic active sites on carbon-based cathode.
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高影响因子
Heliyon
·
2024
·
IF 3.4
Xiang Liu,Zhi Yu,Shan Fang,Yong Li,Guoxing Qu,Nai-Gen Zhou,Dong-Liang Peng
Si-based anode materials have a relatively high theoretical specific capacity and low operating voltage, greatly enhancing the energy density of rechargeable lithium-ion batteries (LIBs). However, their practical application is seriously hindered by the instability of active particles and anode electrodes caused by the huge swelling during cycling. How to maintain the stability of the charge transfer network and interface structure of Si particles is full of challenges. To address this issue, we have developed a novel Si@Fe 3 O 4 /AC/CNR anode by in-situ growing one-dimensional high elastic carbon nano-ribbons to wrap Si nanoparticles. This special structure can construct fast channels of electron transport and lithium ion diffusion, and stabilize the surface structure of Si nanoparticles during cycling. With these promising architectural features, the Si@Fe 3 O 4 /AC/CNR composite possesses a high specific capacity of 1279.4 mAh/g at 0.5 A/g, and a superior cycling life with 80 % capacity retention after 700 cycles. Even at a high current density of 20.0 A/g, the composite still delivers a capacity of 621.2 mAh/g. The facile synthetic approach and high performance of Si@Fe 3 O 4 /AC/CNR anodes provide practical insight into advanced anode materials with large volume expansion for high-energy-density LIBs.
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2017
·
IF 4.529
Wenhua Ji,Mingming Zhang,Wenjuan Duan,Xiao Wang,Hengqiang Zhao,Lanping Guo
Phytic acid-stabilized Fe 3 O 4 -graphene oxide (GOPA@Fe 3 O 4 ) was assembled by microwave-enhanced hydrothermal synthesis and super-amphipathicity was demonstrated by measurement of dynamic oil and water contact angles. GOPA@Fe 3 O 4 was used as a sorbent for enrichment of eight polycyclic aromatic hydrocarbons (PAHs) from vegetable oils by magnetic solid-phase extraction (MSPE). The extraction-desorption factors were systematically investigated and, under optimum conditions, the super-amphiphilic sorbent achieved wide linear ranges (0.2–200 ng g −1 ), satisfactory precision (3.44–6.64% for intra-day and 5.39–8.41% for inter-day) and low limits of detection (LODs, 0.06–0.15 ng g −1 ) for PAHs. Excellent recoveries (85.6–102.3%) for spiked PAHs were obtained with genuine vegetable oil samples. These results indicate that MSPE using GOPA@Fe 3 O 4 as the sorbent, coupled with high performance liquid chromatography (HPLC), is an efficient and simple method for the detection of low concentrations of PAHs in vegetable oils.
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2016
·
IF 2.893
Pan Hou,Chaoting Shi,Lan Wu,Xiandeng Hou
Cross-linked Chitosan (CS) loaded with iron species has been widely used as heterogeneous Fenton catalysts for organic contaminant removal. In comparison with raw-CS based Fenton catalysts, it exhibited an improved degradation efficiency due to the stabilization of cross-linking agents. With cross-linking, however, most reactive sites of CS were occupied by cross-linking agents, making its capability decreased sharply for adsorbing the released metal ions from metal-complex dye degradation. In this work, in order to efficiently adsorb the released metal ions from metal-complex dyes and avoid a secondary pollution, a new CS-based heterogeneous Fenton catalyst (Chitosan/Hydroxyapatite/Fe 3 O 4 magnetic composite) was developed for AY220 (a model of metal-complex dyes) removal. Hydroxyapatite (HA), a well-known biocompatible material with strong ability for metal ion adsorption, was introduced to combine with CS for Fe 3 O 4 loading. The total removal efficiency of AY220 by the magnetic composite can reach as high as 95.0%, and the degradation efficiency of AY220 was greatly enhanced compared with a raw-CS based catalyst and bare Fe 3 O 4 . Meanwhile, the composite can efficiently adsorb Co 2 + released from AY220 degradation, which can further promote the degradation of AY220. After five recyclable runs of the composite, the degradation efficiency of AY220 increased from 25.1% to 45.6%, demonstrating its potential usefulness in recyclable degradation of metal-complex dyes.
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高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 10
·303
·
IF 3.553
Haijiao Lu,Jingkang Wang,Hongxun Hao,Ting Wang
With a large specific surface area, high reactivity, and excellent adsorption properties, nano zerovalent iron (nZVI) can degrade a wide variety of contaminants in wastewater. However, aggregation, oxidation, and separation issues greatly impede its wide application. In this study, MoS2/Fe3O4/nZVI nanocomposites were successfully synthesized by a facile step-by-step approach to overcome these problems. MoS2nanosheets (MNs) acted as an efficient support for nZVI and enriched the organic pollutants nearby, leading to an enhanced removal efficiency. Fe3O4nanoparticles (NPs) could not only suppress the agglomeration and restacking of MNs, but also facilitate easy separation and recovery of the nanocomposites. The synergistic effect between MNs and Fe3O4NPs effectively enhanced the reactivity and efficiency of nZVI. In the system, Cr(VI) was reduced to Cr(III) by nZVI in the nanocomposites, and Fe2+produced in the process was combined with H2O2to further remove 4-Chlorophenol (4-CP) through a Fenton reaction. Furthermore, the nanocomposites could be easily separated from wastewater by a magnet and be reused for at least five consecutive runs, revealing good reusability. The results demonstrate that the novel nanocomposites are highly efficient and promising for the simultaneous removal of Cr(VI) and 4-CP in wastewater.Keywords:nZVI;modification;nanocomposites;Cr(VI);4-CP;Fenton reaction;pollution treatment;recyclability;wastewater
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ting Li,Zikai Wang,Zexin Zhang,Kun Feng,Jianru Liang,Dianzhan Wang,Lixiang Zhou
Spontaneous generation of H 2 O 2 and activation in heterogeneous Fenton is a promising technology for waste-water treatment. Here organic carbon modified Fe 3 O 4 /schwertmannite (Fe 3 O 4 /Sch/OC) by introducing Fe 3 O 4 in the Acidithiobacillus ferrooxidans -driven Fe 2+ oxidation process to give catalysts. In-situ H 2 O 2 could be generated via Fe 3 O 4 /Sch/OC-driven oxygen reduction reaction (ORR), moreover, the in-situ H 2 O 2 was disintegrated to produce •OH in Fe 3 O 4 /Sch/OC-driven Fenton reaction to degrade the methylene blue (MB). The catalysts were characterized by XRD , SEM, BET and XPS spectroscopy. Oxygen-containing functional groups (e.g., C = O, –COOH, –OH) on Fe 3 O 4 /Sch/OC surface could provide more active sites for the adsorption and reduction of O 2 . The carbon-modification promoted both the selectivity of 2e − ORR and Fe 2+ content of catalyst. Thus, Fe 3 O 4 /Sch/OC exhibited a higher H 2 O 2 selectivity (~65%) and MB degradation efficiency (~81%) than Sch, Fe 3 O 4 , or Fe 3 O 4 /Sch. In addition, in-situ H 2 O 2 could be produced at a wide initial pH range (3–9). The degradation pathways of MB were also proposed based on theoretically calculated and LC-MS data. The finding opens up a new way for developing a cost-effective Sch-based catalyst for producing in-situ H 2 O 2 and degrading pollutants.
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高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Hong Qian Dai,Yuan Lu,Zhi Hin Ou,Min Xu
Fe3O4-APTES-CS2 was prepared by modification of Fe3O4 with 3-aminopropyltriethoxysilane (APTES) and carbon disulfide (CS2). Lipase was covalently bonded to Fe3O4-APTES-CS2 to obtain the immobilized lipase Fe3O4-APTES-CS2-lipase. The textural characteristic of Fe3O4-APTES-CS2-lipase was assessed by scanning electron microscopy. The optimal immobilization conditions were 2.5 mg/mL lipase, pH 7.0, 35 °C, 3 h. The loading amount of lipase was 119.0 mg/g carrier. The immobilization efficiency reached 57%. (R)-(+)-N-acetyl-1-methyl-3-amphetamine was synthesized by Fe3O4-APTES-CS2-Li- pase. The conversion, enantiomeric excess of (R)-(+)-N-acetyl-1-methyl-3-amphet-a- mine and E value reached 36.8%, 98.5% and 132, respectivel.
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