IONICS
·
2017
·Vol. 24
·期 9
·2697-2704
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IF 2.062
Li Yanfei,Yu Jie,Chen Shouhui,Huang Zhenzhong,Wang Li
In this work, the commercial carbon paper was firstly peeled in K 2 CO 3 solution and then was further treated in a KNO 3 solution to form functional exfoliation graphene (FEG) on the commercial carbon paper. The FEG/carbon paper was characterized by Raman spectra and scanning electron microscopy, confirming that some typical layered fold graphenes were successfully peeled off and stood on the carbon paper matrix. Then, Fe 3 O 4 nanoparticles (NPs) were grown on the surface of FEG/carbon paper and the as-prepared Fe 3 O 4 NPs/FEG/carbon paper was directly used as supercapacitor electrode. The specific capacitance of Fe 3 O 4 NPs/FEG/carbon paper was about 316.07 F g −1 at a current density of 1 A g −1 . Furthermore, the FEG/carbon papers were also functionalized by benzene carboxylic acid to form FFEG/carbon papers, and then the Fe 3 O 4 NPs were grown on the surface of FFEG/carbon paper. The specific capacitance of Fe 3 O 4 NPs/FFEG/carbon paper was 470 F g −1 at a current density of 1 A g −1 , superior to some previous reported results. This work might provide a new strategy to prepare various nanostructures on FFEG/carbon papers for future applications.
研究领域:
材料科学
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能源存储与转换
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DOI
高影响因子
CLEAN-Soil Air Water
·
2016
·Vol. 44
·期 9
·1146-1153
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IF 1.716
Hongmei Jiang,Menglan Sun,Jiangyan Xu,Aimin Lu,Ying Shi
Preparation of polyethyleneimine functionalized magnetic Fe 3 O 4 by using a one-step solvothermal method is reported in this paper. The effect of the amount of polyethyleneimine on the properties of the prepared materials including the shape, size, and adsorption performance was investigated in detail. The magnetic adsorbent with the best adsorption capacity was prepared and used for the removal of Pb(II) in an aqueous medium. Adsorption experiments were performed to evaluate the effect of different sorption parameters, such as pH, initial concentration of Pb 2+ , and contact time. Langmuir and pseudo-second-order models were used for isotherm and kinetic studies, through which a maximum adsorption capacity of 143 mg g −1 could be calculated. Pb(II) could be desorbed from magnetic Fe 3 O 4 nanoparticles modified with polyethyleneimine by 0.5 mol L −1 HCl and used for five cycles without any adsorption performance loss, indicating that the polymeric magnetic adsorbent used in this work had good reusability and great potential for practical application.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Qi Liu,Haiying Qu,Shuangxing Liu,Yusong Zhang,Shengwei Zhang,Jianwei Liu,Bo Peng,Dan Luo
Nanoparticle stabilized foam flooding is a new rising technology of enhanced oil recovery (EOR) which could be applied to produce more crude oil from low permeability reservoirs, but it is still in lab-scale studies. In this paper, Fe 3 O 4 nanoparticles were selected and grafted 1,2-epoxy dodecane for increasing the hydrophobicity of particles’ surface and then characterized by FTIR, TGA and TEM. The samples with four different contact angles (12.7°, 20.6°, 57.5° and 94.3°) were chosen to prepare surface unmodified and modified Fe 3 O 4 /sodium dodecyl sulfate/polyacrylamide ((M)Fe 3 O 4 /SDS/HPAM) foam dispersion systems and compared their static foam stability. The results showed that the modification on the surface of nanoparticles method could prolong foam half-time of Fe 3 O 4 stabilized foam system. The foam half-time of the system stabilized by the modified Fe 3 O 4 nanoparticles with the contact angle of 94.3° was 2.36 times higher than that of unmodified ones. The core flooding experiments were conducted with the low permeability core samples (< 10 mD)saturated with Dagang crude oil at 80 ℃, 18 MPa, and the results indicated that CO 2 foam stabilized by modified Fe 3 O 4 with the contact angle of 94.3° could result in a higher oil recovery rate of 10.64 % OOIP after water flooding. It can be concluded that the modified Fe 3 O 4 nanoparticle stabilizing CO 2 foam system could be a promising tertiary oil recovery method for low permeability reservoirs.
研究领域:
石油工程
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材料科学
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界面化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Na Luo,Zhengli Yang,Fenglin Tang,Dan Wang,Min Feng,Xiangjun Liao,Xiupei Yang
In recent years, carbon nanodots (CNDs)-based hybrid nanomaterials with enzyme-like properties have received considerable attention because of the simplicity of their preparation, storage, and separation, as well as cost-effectiveness compared with natural enzymes. Here, Fe3O4/CNDs hybrid nanoparticles (NPs) are prepared via a hydrothermal method, and they possess excellent peroxidase-like catalytic activity. During the synthesis, the formation and surface state of Fe3O4 NPs were extremely affected by solutions of CNDs, which served as solvents. Fe3O4/CNDs hybrid NPs with abundant hydroxyl and carboxyl groups exhibit better catalytic kinetics than natural horseradish peroxidase (HRP) to produce a rapid chromogenic reaction. Such characteristics from Fe3O4/CNDs hybrid NPs led us to develop a colorimetric method for rapid and selective determination of glutathione with the detection limit of 0.058 μM. Our approach offers a simple and novel method to prepare Fe3O4/CNDs hybrid NPs with modified CNDs, and their applications may be extended to biosensors, medical diagnostics, and environmental monitoring.
研究领域:
纳米材料
·
生物传感
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医学诊断
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DOI
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2019
·Vol. 34
·期 3
·752-759
·
IF 0.605
Tang Qiuhan,Zhao Rui,Lu Qi,Qing Guangyan
A novel phosphoprotein separation material was developed, which is constructed by a magnetic mesoporous Fe 3 O 4 @TiO 2 (Fe 3 O 4 @mTiO 2 ) microsphere and a 5-aminoisophthalic acid (AIPA) monolayer that provides additional binding sites toward phosphate groups. The results of characteristic experiments demonstrated that Fe 3 O 4 @mTiO 2 -AIPA had good dispersability, high magnetic susceptibility, and satisfactory grafting ratio of AIPA, ascribed to the large specific surface area of the inorganic substrate. Taking advantages of these features, Fe 3 O 4 @mTiO 2 -AIPA was successfully utilized to separate α -casein (a typical phosphoprotein) and bovine serum albumin (BSA, a typical non-phosphoprotein) from their mixtures (molar ratio = 1:2). Through adjusting pH and polarity of solutions, the BSA and α -casein were respectively enriched in washing fraction and elution fraction. This result displays the good potential of Fe 3 O 4 @mTiO 2 -AIPA for application in phosphoprotein enrichment.
研究领域:
生物化学
·
蛋白质组学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2016
·
IF 3.138
Gang Fang,Honggao Chen,Yunpeng Zhang,Anqing Chen
Fe 3 O 4 magnetic nanometer particles (MNPS) with a diameter of 30–40 nm and coated by ammoniated silicon dioxides were developed by sol–gel method. The X-ray diffraction (XRD) pattern indicates that the Fe 3 O 4 is wrapped in the amorphous SiO 2 , and the Fourier-transform infrared spectroscopy (FT-IR) analysis confirmed the NH 2 group had been successfully introduced onto the surface of Fe 3 O 4 @SiO 2 nanoparticles. The main factors related to the immobilization process of pectinase onto the magnetic support were optimized by multi-factor orthogonal experiments, and the recommended combination is that 3% glutaraldehyde (coupling agent), pH = 8.0, 50 °C, and cross-linking time 8 h. Scanning electron microscope (SEM) and FT-IR analyses confirmed that the pectinase had been immobilized onto the surface of the amino modified nanoparticles. The storage stability and reusability of the pectinase were enhanced by the immobilization that 64.4% of the total starting activity was retrieved after 7 recycling batches and only about 21.1% of the total activity was lost after 30-day storage. For the application of the immobilized pectinase, the optimal pH and temperature were 8.5 and 55 °C, respectively.
研究领域:
生物化学
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纳米生物学
·
酶工程
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产品关联
DOI
PubMed
高影响因子
CARBON
·
2016
·
IF 6.198
Chao Liu,Hongxia Yan,Qing Lv,Song Li,Song Niu
By taking advantage of design and construction of strong graphene–matrix interfaces, a ternary nanoparticle (GNS-Fe 3 O 4 @PZM) consisting of graphene, Fe 3 O 4 nanoparticles and highly cross-linked polyphosphazene has been synthesized via a two-stage process consisting of co-precipitation and precipitation polymerization. And then the bismaleimide (BMI) matrix composites with aligned GNS-Fe 3 O 4 @PZM are fabricated under a magnetic field to take full advantage of the tribological properties of graphene. Characterization results reveal that the 0.8 wt% aligned GNS-Fe 3 O 4 @PZM/BMI composite has the lowest friction coefficient and volume wear rate compared with non-aligned GNS-Fe 3 O 4 @PZM/BMI and aligned GNS-Fe 3 O 4 /BMI composites under all the test conditions. In addition, the aligned GNS-Fe 3 O 4 @PZM/BMI also shows superior mechanical properties and thermal stability. The excellent properties of aligned GNS-Fe 3 O 4 @PZM/BMI result from uniformly distribution and parallel alignment of graphene in the BMI matrix, as well as good interface interaction between GNS-Fe 3 O 4 @PZM and BMI matrix.
研究领域:
材料科学
·
复合材料
·
摩擦学
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 77
·期 4
·2115-2124
·
IF 2.146
Lin Yamei,Zhi Hongxin,Liu Shengkai,Chen Boyu,Fu Yujie,Liu Zhiguo
Proanthocyanidins-functionalized Fe 3 O 4 @ Ag nanoparticles (Fe 3 O 4 @ AgNPs) were synthesized by one-step hydrothermal method wherein silver nanocrystals were grown in situ on the surface of Fe 3 O 4 nanoparticles with the assistance of proanthocyanidins. The morphology and structure of Fe 3 O 4 @ AgNPs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier-transform infrared spectrometer (FTIR), UV–Vis spectrophotometer (UV–Vis), X-ray powder diffractometer (XRD), and physical property measurement system (PPMS). The characterization results indicated that sliver nanocrystals were deposited on the surface of Fe 3 O 4 nanoparticles to form spherical and uniformly dispersed Fe 3 O 4 @ AgNPs. Moreover, the Fe 3 O 4 @ AgNPs had a high magnetic response, which can be recovered from the environment. The antibacterial activity of the Fe 3 O 4 @ AgNPs against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ), and Candida albicans ( C. albicans ) was investigated. The results confirmed that the Fe 3 O 4 @ AgNPs had broad-spectrum antibacterial activity. At the same time, the adsorption property of the nanoparticles for heavy metal ions Cu 2+ , Pb 2+ , and Cd 2+ was also studied. The results showed that pH and incubation time played an essential role in the removal of heavy metal ions, and the nanoparticles had excellent removal efficiency. The multifunctional nanomaterial Fe 3 O 4 @ AgNPs prepared by this study have the potential to apply in the biomedical and water disinfection fields.
研究领域:
材料科学
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生物医学
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环境科学
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DOI
高影响因子
Sustainability
·
2023
·Vol. 15
·期 17
·13279
·
IF 3.9
Ke Li,Miaomiao Chen,Lei Chen,Songying Zhao,Wencong Xue,Yanchao Han
In this study, a novel Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst was successfully synthesized, tailored specifically for the visible light-driven photocatalytic degradation of sulfonamide antibiotics, more precisely, sulfamethazine (SMZ). To analyze the fabricated samples, characterization techniques such as X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), and UV-vis diffuse reflectance spectra (UV-vis) were systematically employed. The composite showcased efficient visible-light absorption and charge separation, with its peak photocatalytic performance recorded at a solution pH value of 6.0. Significantly, the Fe3O4/Ag3PO4/g-C3N4magnetic composite photocatalyst displayed excellent stability and recyclability, consistently maintaining a high degradation efficiency of over 97% even after five consecutive cycles. Further experimentation with radical scavengers confirmed a significant decrease in photocatalytic activity, establishing that superoxide radicals (•O2−) and photo-generated holes (h+) are the primary active species during the degradation of SMZ. Overall, it provides a crucial understanding regarding the photocatalytic decomposition of sulfonamide antibiotics using magnetic composite photocatalysts. It also emphasizes the promising potential of the Fe3O4/Ag3PO4/g-C3N4composite for tangible applications in environmental remediation.Keywords:visible light;photocatalysis;Fe3O4/Ag3PO4/g-C3N4;sulfonamide
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Lixin Zhou,Shengdong Pan,Xiaohong Chen,Yonggang Zhao,Baobo Zou,Micong Jin
A novel core–shell covalently functionalized Fe 3 O 4 coated SiO 2 decorated multi-walled carbon nanotubes (Fe 3 O 4 @SiO 2 –MWCNTs) adsorbent was synthesized and characterized by scanning electron microscopy, transmission electron microscopy, Fourier Transform Infrared Spectrum (FTIR), Thermogravimetry, X-ray diffraction and magnetic measurements. The pentachlorophenol (PCP) adsorption effect factors of initial concentration, contact time, solution pH and temperature were investigated in detail. It was found the absorption capacity was strongly depended on pH, and the maximum adsorption value for PCP (96.4 mg/g) was obtained at pH 2.5. The equilibrium was attained within 30 min, and the adsorption kinetics was better described by pseudo-second-order kinetic model. The data pointed out excellent fit to Freundlich isotherm model. Thermodynamic parameters such as standard enthalpy (Δ H θ ), standard entropy (Δ S θ ) and standard free energy (Δ G θ ) showed that the adsorption of PCP onto Fe 3 O 4 @SiO 2 –MWCNTs was spontaneous, endothermic and random within the temperature range of 288–318 K. The results indicate that the Fe 3 O 4 @SiO 2 –MWCNTs adsorbent is a potential low-cost effective material for PCP removal from contaminated wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Junjie Fan,Jianpeng Cui,Tianhao Zhang,Jianwen Hu,Ziqi Wu,Mingshuo Chi,Wenqing Xie,Shuangqing Sun,Songqing Hu
In this study, we successfully synthesized silica coated Fe 3 O 4 nanoparticles (Fe 3 O 4 @SiO 2 NPs) and further animated their surface to create amino modified Fe 3 O 4 @SiO 2 (Fe 3 O 4 @SiO 2 -NH 2 ) NPs. By taking advantage of the pH-responsive dynamic (covalent) imine bond between the hydrophilic Fe 3 O 4 @SiO 2 -NH 2 NPs and the hydrophobic cinnamaldehyde molecule (R), we developed dynamic covalent Fe 3 O 4 @SiO 2 (Fe 3 O 4 @SiO 2 -R) NPs with switching wettability . These NPs were then utilized to form Pickering emulsions , and whose stability and pH/magnetic response were thoroughly investigated. As the NPs concentration in the emulsion increased, the emulsion stability initially improved but then subsequently slightly decreased. Emulsifiers exhibited emulsifying effect on various oil phases, with paraffin oil demonstrating the best effect. By adding Hydrochloric acid to the emulsion, we successfully broke the imine bond at a pH value of 2.8, resulting in demulsification. Applying a magnetic field also achieved demulsification. After five cycles of pH or magnetic response-induced emulsification and demulsification, a stable Pickering emulsion could still be obtained. Stimuli-responsive Pickering emulsions have been extensively studied, but there is limited research on double-responsive Pickering emulsions. This study presents a novel design of Pickering emulsions with pH/magnetic dual responsiveness, offering great potential for oil-water separation applications.
研究领域:
材料科学
·
化学工程
·
界面科学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Wenhui Tian,Penggang Ren,Xin Hou,Runzhuo Xue,Zhengyan Chen,Zhengzheng Guo,Yanling Jin,Fang Ren
As the most attractive electrode for supercapacitors , renewable carbon-based material exhibits slow charge and discharge ability and low volumetric energy density , severely hindering its extended applications. Herein, a neotype and high-performance carbon-based nanocomposites were successfully prepared from Linum usitatissimum . L stems assisted with K 4 Fe(CN) 6 ·3H 2 O through a green and straightforward high-temperature treatment method. Benefiting from the activation and decomposition of K 4 Fe(CN) 6 ·3H 2 O, the carbon-based nanocomposite decorated by Fe 3 C and Fe 3 O 4 possesses moderate porous volume, heteroatoms content, and graphitization degree. These characteristics endow the supercapacitor assembled from as-prepared carbon-based nanocomposite with fast charge/discharge ability, high volumetric capacitance (303.8 F cm −3 , 1 A g −1 ), excellent rate performance (61.3%, 100 A g −1 ), and outstanding cycle life. Owing to abundant N/O-containing functional groups, high C=C content, and appropriate specific surface area , the resultant nanocomposite also exhibits excellent organic dye removal performance. Overall, this work offers a green and efficient avenue for designing multi-doped carbon-based nanocomposites in electrochemical energy storage and organic dye removal.
研究领域:
材料科学
·
电化学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）