Journal of Materials Chemistry A
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2023
·Vol. 11
·期 13
·6934-6944
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IF 11.9
Yuxiao Yang,Jianyun Zhao,Jiuhong Wang,Yinhuan Li,Wei Yu,Shujiang Ding
Magnetic MXene-based composites have been extensively developed for highly effective electromagnetic (EM) wave absorption. However, previously reported studies neglected the influence of regulating primary dissipation sources and electron migration on absorption performance. This is probably due to the fact that the present modification methods frequently severely oxidize MXenes, obliterating the electron migration pathway. Here, a facile strategy is developed to create sandwich-like m-Ti3C2/Fe3O4 (MTF) composites by electrostatic assembly. The room temperature assembly process prevents oxidation and safeguards the in-plane electron migration path of m-Ti3C2. This makes it possible to reveal the mechanism by which increased Fe3O4 content inhibits electron migration, lowers attenuation capacity, and leads to increasing impedance-matching thickness. More importantly, we provide the first explanation of the absorption band transfer phenomenon. Additionally, at a thickness of 2.96 mm, the as-prepared MTF composites exhibit exceptional EM wave absorption capacity, reaching −77.5 dB with an effective absorption band of 3.0 GHz. The comprehensive insight presented in this work offers a solid theoretical foundation for an in-depth understanding of the influence of electron hopping behaviors on electromagnetic characteristics and, consequently, EM wave absorption performance, which further offers an essential roadmap to fabricate high-performance absorbers.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
·Vol. 30
·期 17
·51125-51142
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IF 5.8
Lu Mang,Wu Xue-jiao,Wan Chu-xing,Gong Qiu-ping,Li Jia-xin,Liao Shuang-shuang,Wang Yu-an,Yuan Shu-hao
A reduced graphene oxide (RGO) supported Fe 3 O 4 -MnO 2 nanocomposite (Fe 3 O 4 -MnO 2 @RGO) was successfully prepared for catalytic degradation of oxytetracycline (20 mg/L) by potassium persulfate (PS) and adsorption removal of mixture of Pb 2+ , Cu 2+ , and Cd 2+ ions (each 0.2 mM) in the synchronous scenario. The removal efficiencies of oxytetracycline, Pb 2+ , Cu 2+ , and Cd 2+ ions were observed as high as 100%, 99.9%, 99.8%, and 99.8%, respectively, under the conditions of [PS] 0 = 4 mM, pH 0 = 7.0, Fe 3 O 4 -MnO 2 @RGO dosage = 0.8 g/L, reaction time = 90 min. The ternary composite exhibited higher oxytetracycline degradation/mineralization efficiency, greater metal adsorption capacity (Cd 2+ 104.1 mg/g, Pb 2+ 206.8 mg/g, Cu 2+ 70.2 mg/g), and better PS utilization (62.6%) than its unary and binary counterparts including RGO, Fe 3 O 4 , Fe 3 O 4 @RGO, and Fe 3 O 4 -MnO 2 . More importantly, the ternary composite had good magnetic recoverability and excellent reusability. Notably, Fe, Mn, and RGO could play a synergistic role in the improvement of pollutant removal. Quenching results indicate that surface bounded SO 4 •– was the major contributor to oxytetracycline decomposition, and the -OH groups on the composite surface shouldered a significant role in PS activation. The results indicate that the magnetic Fe 3 O 4 -MnO 2 @RGO nanocomposite has a good potential for removing organic-metal co-contaminants in waterbody. Graphical Abstract
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BIOCHEMICAL ENGINEERING JOURNAL
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2019
·
IF 3.371
Jianguo Zhang,Hongli Mao,Mengla Li,Erzheng Su
An enzymatic approach to β-cyclodextrin synthesis attracts the attention of food engineers and chemists because of the broad applications of β-cyclodextrin in the food industry and the demand for a green process for β-cyclodextrin production. Achieving a high recovery of cyclodextrin glycosyltransferase through immobilization and a high proportion of β-cyclodextrin in a product mixture of cyclodextrins would improve the purification process of β-cyclodextrin. In this study, a recombinant cyclodextrin glycosyltransferase (CGTase) was immobilized on polydopamine-Fe 3 O 4 (PDA-Fe 3 O 4 ) nanoparticles in the presence of polyethyleneimine (PEI). After optimization of the preparation of the PDA-Fe 3 O 4 nanoparticles and the CGTase immobilization step, 77.9% of the CGTase was recovered. The immobilized CGTase exhibited good thermal and operational stabilities, and gave a ratio of 88.9% β-cyclodextrin when the reaction temperature and kinetic parameters were optimized. Immobilized CGTase was recycled nine times and retained 19.1% β-activity and 0% γ-activity. This study has established a reliable approach to the high recovery of CGTase during efficient β-cyclodextrin production.
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RSC Advances
·
2019
·Vol. 9
·期 6
·2877-2884
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IF 3.049
Yanlin Li,Sen Yang,Xuegang Lu,Wenyuan Duan,Toshihiro Moriga
Fe3O4–Ag Janus composites were synthesized using a two-step solvothermal method. The optimal growth process was determined by investigating the relationship between the particle morphologies and reaction time. Magnetic and Raman spectroscopic measurements showed that the as-synthesized Janus composites have both good magnetic response and significant surface-enhanced Raman scattering (SERS) effects, as well as reproducibility. The calculated Raman enhancement factor reached an unprecedented magnitude of 109 compared with the values of other Fe3O4–Ag compounds. Furthermore, the SERS effect was exhibited even at a concentration of probe molecules as low as 10−13 M. This demonstrates that the as-synthesized Fe3O4–Ag Janus composite particles have promise for application as separable, highly sensitive SERS substrates.
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ACS Omega
·
2019
·
IF 2.584
Chunxia Wang,Huangliang Zhong,Wenjie Wu,Caiwen Pan,Xiaoran Wei,Guanglin Zhou,Fan Yang
Herein, we demonstrate a new class of core–shell magnetic carbon hybrid materials (Fe3O4@C) for remarkable adsorptive desulfurization of dibenzothiophene (DBT), which have been successfully prepared through hydrocarbonization of glucose on the surface of Fe3O4 and the subsequent pyrolyzation process. The as-obtained Fe3O4@C retains amorphous nature of carbon shells with a large surface area and displays an increase of iron atoms as active sites under elevated pyrolyzation temperature which is favorable in the adsorption of sulfur-containing species through physical and chemical adsorption, respectively. We investigate the adsorption capacity and efficiency of Fe3O4@C as a magnetically adsorbent for the removal of DBT in model oils under various experimental conditions including the adsorbent obtained at different temperatures, the amount of adsorbents, the DBT initial concentration, the regeneration approach, as well as the interference species. Our results demonstrated that the as-obtained Fe3O4@C at 650 °C (Fe3O4@C-650) displays a remarkable estimated adsorption performance (57.5 mg DBT/g for 200 ppmw), extraordinary high desulfurization efficiency (99% for 200 ppmw), and a high selectivity for DBT compared with its derivatives. Moreover, Fe3O4@C can be recovered in a quite easy, economical, and eco-friendly manner by an external magnet after five cycles without significant weight loss, which significantly simplifies the operation procedure and favors the recycle of Fe3O4@C. Combined with the economic and eco-friendly merits, Fe3O4@C offers a new avenue to employ the magnetic carbon materials for industrial applications and provides a promising substitute for adsorptive desulfurization in view of academic, industrial, and environmental aspects.
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NANO
·
2019
·
IF 1.293
Jianglin Xu,Yaping Zhu,Yan Sun,Anjian Xie
In this report, the porous Fe 3 O 4 /C nanocomposites were successfully synthesized by using ferrocene as raw material and dilute nitric acid as solvent via extremely convenient and low-cost one-step calcining method. The formation of porous structure resulted from the aggregation and assembly of numerous nanoparticles. The experimental results show that the crystallinities, morphologies and electrochemical performance of samples were affected by the calcining temperature and carbon content. As an anode for lithium-ion batteries (LIBs), the Fe 3 O 4 /C nanocomposites obtained at calcination temperature of 500 ∘ C (Fe 3 O 4 /C-a500) exhibited remarkable initial specific discharge capacity of 1418 mA h g − 1 and a reversible capacity retention of 721 mA h g − 1 after 100 cycles at the current density of 100 mA g − 1 . The excellent properties can be attributed to the high theoretical capacity of Fe 3 O 4 , the high conductivity of carbon and especially the porous structure, which offered more sites for the storage and insertion of Li ions. Even at the current density of 1000 mA h g − 1 , the reversible capacity of Fe 3 O 4 /C-a500 can be up to 291 mA h g − 1 , indicating the prepared typical nanocomposite presented excellent electrochemical performances and lithium storage capacity, which may be a promising candidate as the anode material for LIBs.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2019
·Vol. 21
·期 24
·12850-12858
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IF 3.567
Xin Jiang,Qinqin Sang,Ming Yang,Juan Du,Weie Wang,Libin Yang,Xiaoxia Han,Bing Zhao
The exploitation of new types of non-metal surface-enhanced Raman scattering (SERS) substrates with high performances and the exploration of enhancement mechanisms are of vital importance for the development of the SERS technology due to its potential prospects in both the spectroscopy and material fields. Here, a magnetic SERS-active substrate hybridized by reduced graphene oxide (rGO), TiO2 and Fe3O4 (rGO–TiO2–Fe3O4) was successfully prepared via the combination of a simple sol-hydrothermal method and a co-precipitation method. The as-synthesized rGO–TiO2–Fe3O4 nanohybrid not only exhibited outstanding SERS detection ability with high sensitivity and spectral reproducibility, but also could be recycled with high stability based on its self-cleaning capacity and magnetism. Exploiting these features, it could be used for the SERS detection of 4-mercaptobenzoic acid (4-MBA), 4-mercaptopyridine (4-MPy), 6-mercaptopurine monohydrate (6-MP), 1,2-di(4-pyridyl) ethylene (BPE) and p-aminobenzoic acid (PABA) with the detection limits of 1.0 × 10−10, 1.0 × 10−8, 1.0 × 10−10, 1.0 × 10−10 and 1.0 × 10−9 mol L−1, respectively; these are the highest SERS sensitivity values among those reported for semiconductor substrates and are even lower than that of noble metal substrates. Meanwhile, an SERS enhancement mechanism from the synergistic effects of the rGO, TiO2 and Fe3O4 components was proposed to explain the observed considerable SERS enhancement on rGO–TiO2–Fe3O4.
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JOURNAL OF SEPARATION SCIENCE
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2019
·Vol. 42
·期 8
·1610-1619
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IF 2.516
Chaoran Liu,Xinya Liu,Philip J. Marriott,Heng Qian,Zilin Meng,Zhirong Yang,Runhua Lu,Haixiang Gao,Wenfeng Zhou
In this work, a method for the analysis of benzoylurea insecticides, including hexaflumuron, flufenoxuron, lufenuron and chlorfluazuron, in tea samples by high-performance liquid chromatography with Fe 3 O 4 -hyperbranched polyester nanocomposite as the adsorbent for magnetic solid-phase extraction was developed. The magnetic nanocomposite was prepared and characterized by infrared spectroscopy, vibrating sample magnetometry, and scanning electron microscopy. The as-prepared nanocomposite was used as a sorbent for the extraction and preconcentration of pesticide residues in tea samples. The extraction and desorption conditions, including mass ratios of raw materials, amount of sorbent, pH value, extraction time, and desorption time, were investigated. Under the final conditions chosen for the analysis, good linearity was obtained for all the tested compounds, with R 2 values of at least 0.9979. The limits of detection were determined in the range of 0.15–0.3 μg/L. The recovery obtained from the analysis of tea samples with various spiked concentrations was between 90.7 and 98.4%, with relative standard deviations (n = 4) lower than 4.1%. Furthermore, the present approach was successfully applied to the quantitative determination of residues of benzoylurea insecticides in real samples.
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BIOSENSORS & BIOELECTRONICS
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2018
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IF 8.173
Wenshi Li,Gao-Chao Fan,Fengxian Gao,Yige Cui,Wei Wang,Xiliang Luo
Sensitive but with simple, inexpensive detection of disease-related biomarkers in real biological samples is of quite necessity for early diagnosis and disease surveillance. We herein first introduced high-activity Fe 3 O 4 nanozyme as signal amplifier to develop an ultrasensitive photoelectrochemical (PEC) immunoassay , which meanwhile has the distinct merits of both simplicity and low cost compared with previously reported enzyme-labeling PEC immunoassays. In the proposal, to illustrate and describe the PEC platform, prostate-specific antigen (PSA, Ag) was used as a target model. Specifically, ZnO nanorods (ZnO-NRs) grown vertically on a bare indium–tin oxide (ITO) electrode was deposited with ZnIn 2 S 4 nanocrystals , producing ZnIn 2 S 4 /ZnO-NRs/ITO photoelectrode as the PEC matrix to modify capture PSA antibody (Ab 1 ). Histidine-modified Fe 3 O 4 (his-Fe 3 O 4 ) nanozyme as signal amplifier was linked with signal PSA antibody (Ab 2 ) to form his-Fe 3 O 4 @Ab 2 conjugate, and was anchored through specific sandwich immunoreaction. The labeling his-Fe 3 O 4 nanozyme acted as a peroxidase to induce the generation of the insoluble and insulating precipitation, resulting in an evident decrease in the photocurrent signal. On account of combined effects of high catalytic efficiency of the his-Fe 3 O 4 nanozyme and excellent PEC properties of the ZnIn 2 S 4 /ZnO-NRs/ITO photoelectrode, ultralow detection limit of 18 fg/mL for target Ag detection was achieved. Besides, as high-activity his-Fe 3 O 4 nanozyme has substituted natural enzyme as signal amplifier, simplicity and low cost of the PEC immunoassay was realized.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 2
·1626-1636
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IF 2.324
Li Yuexuan,Duan Yugang
Silicon coupling reagent is regarded as a common additive on surface treatment of polymer due to its high bonding strength and low cost. In this paper, a series of γ-(2, 3-epoxypropoxy) propyltrimethoxysilane (KH560)-based reduced graphene oxide (RGO)@Fe 3 O 4 (KH560/RGO@Fe 3 O 4 ) composites with different ratio of Fe 3 O 4 nanoparticles (NPs) are synthesized by a facile hydrothermal method. It is confirmed that the silicon reagent KH560, as a hopeful candidate for increasing the RGO lattice defects, is favorable to improve the electromagnetic wave absorption. Meanwhile, the microwave attenuation mechanism of KH560/RGO@Fe 3 O 4 composite suggests that the dielectric loss mainly causes by multiple Debye dipolar relaxation and its magnetic loss comes from the eddy-current effect of Fe 3 O 4 NPs over the high frequency range. In consequence, the KH560/RGO@Fe 3 O 4 composite endows the excellent absorption performance, the reflection loss (RL) value is optimized to − 25 dB at 14.1 GHz with a thickness of 3 mm and the maximum frequency bandwidth for RL < − 10 dB is 4.1 GHz with a thickness of 4 mm.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2019
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IF 2.722
Nannan Geng,Wei Chen,Hang Xu,Tao Lin,Mingmei Ding,Yi Wang,Hui Tao,Kai Hu
In order to remove the humic acid (HA) from the drinking water efficiently, novel quaternary Fe 3 O 4 /TiO 2 –N-GO (FTNG) sonocatalysts with different amounts of Fe 3 O 4 were simply synthesized, and a sono-photocatalytic system was used by combining photocatalysis and ultrasound processes. A series of characterizations were performed to confirm the successful synthesis of FTNG and some of its properties, and the results showed that FTNG with an appropriate amount of Fe 3 O 4 can extend the range of light absorption to over 400nm (UV-vis spectra) and improve the separation efficiency of electrons and holes (Photocurrent responses). Raman spectra indicated the reduction of GO. Sono-photocatalytic performance was investigated under visible light irradiation and the effect of ultrasound was studied. Among all the catalysts, FTNG-0.2 with 0.2 g Fe 3 O 4 , exhibited the best HA removal abilities, about 80% for sono-adsorption and 93% for sono-photocatalysis. The removal efficiency in sono-photocatalytic system was about 42% higher than only adsorption and 26% higher than only photocatalysis. Finally, we proposed the possible reaction mechanisms. First, ultrasound pretreatment had a positive effect on HA removal, and a Fenton-like system was then established with H 2 O 2 produced by cavitation effect. Second, the doping of Fe 3 O 4 , N and GO improved the quantum efficiency. The improvement of visible light catalytic performance is mainly attributed to the doping of N. This work is significant for the field of ultrasonic and catalytic degradation, especially for the removal of humic acid in drinking water.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Kun Wang,Dongying Ju,Guiying Xu,Yongfei Wang,Shaobei Chen,Jian Zhang,Yuyuan Wu,Weimin Zhou
The new functional FeO/C composite carbon materials are successfully fabricated by controlling the adding amounts of Fe 3 O 4 particles in mixtures of coal tar pitch and Fe 3 O 4 particles. The structures of prepared FeO/C composite carbon materials were verified by XRD measurements. The excellent electrochemical performances of FeO/C composite carbon materials were evaluated in detail. For instance, the prepared materials show the high cycling performances at 679 mAh/g after carrying out charge-discharge 100 cycles. Meanwhile, the high rate performances and long cycle life characteristics of FeO/C composite materials were also observed. As a result, it is palpable that the carbon contents and specific area are the vital factors to improve the electrochemical performances of FeO/C composite materials, which effectively provides the reference to design the transition metal oxide/carbon composite materials as Li + ion storage materials.
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