RSC Advances
·
2015
·Vol. 5
·期 70
·56478-56485
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IF 3.84
Guozhi Fan,Shanshan Luo,Qiang Wu,Tao Fang,Jianfen Li,Guangsen Song
A magnetic Fe3O4@SiO2–ZnBr2 catalyst was prepared by supporting ZnBr2 on silica-coated magnetic nanoparticles of Fe3O4 and used as a recoverable catalyst for the direct synthesis of diphenyl carbonate (DPC) from CO2 and phenol in the presence of carbon tetrachloride. The as-prepared catalyst was characterized by infrared spectroscopy (IR), powder X-ray diffraction (XRD), a X-ray photoelectron spectrometer (XPS) and BET. Zn loading in the supported catalyst and leaching during the reaction process were determined by atomic absorption spectroscopy (AAS). It was found that Fe3O4@SiO2–ZnBr2 showed higher catalytic activity than homogenous ZnCl2 and ZnI2 as well as homogenous ZnBr2. With this new catalyst under optimized conditions, a yield of DPC at 28.1% was obtained. The heterogeneous catalyst Fe3O4@SiO2–ZnBr2 can also be recovered by a permanent magnet after the reaction and reused up to 4 times without noticeable deactivation.
研究领域:
化学工程
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材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Lili Lian,Jinyi Lv,Xiyue Wang,Dawei Lou
A novel magnetic solid–phase extraction approach was proposed for extraction of potential residues of tetracyclines (TCs) in tap and river water samples, based on Fe 3 O 4 @SiO 2 @FeO magnetic nanocomposite. Characterized results showed that the received Fe 3 O 4 @SiO 2 @FeO had distinguished magnetism and core–shell structure. Modified FeO nanoparticles with an ∼5 nm size distribution were homogeneously dispersed on the surface of the silica shell. Owing to the strong surface affinity of Fe (II) toward TCs, the magnetic nanocomposite could be applied to efficiently extract three TCs antibiotics, namely, oxytetracycline, tetracycline and chlortetracycline from water samples. Several factors, such as sorbent amount, pH condition, adsorption and desorption time, desorption solvent, selectivity and sample volume, influencing the extraction performance of TCs were investigated and optimized. The developed method showed excellent linearity (R > 0.9992) in the range of 0.133–333 μg L −1 , under optimized conditions. The limits of detection were between 0.027 and 0.107 μg L −1 for oxytetracycline, tetracycline and chlortetracycline, respectively. The feasibility of this method was evaluated by analysis of tap and river water samples. The recoveries at the spiked concentration levels ranged from 91.0% to 104.6% with favorable reproducibility (RSD < 4%).
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
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2015
·Vol. 88
·期 3
·529-532
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IF 0.276
Shang Hongzhou,Zhang Xin,Zhao Jingdong,Liang Hongyu
Firstly, micro-particles Fe 3 O 4 /SiO 2 were prepared by sol-gel method, with nano-Fe 3 O 4 and tetraethoxysilane (TEOS) as original materials. Secondly, γ-aminoproplytriethoxysilane (KH-550) was used as couple agent to deal with the surface of micro-particles Fe 3 O 4 /SiO 2 , therefore amine was introduced to the surface of micro-particles Fe 3 O 4 /SiO 2 /KH-550. Finally, acrylamide (AM) and methyl methacrylic acid (MMA) as the functional comonomers, were grafted on the surface of micro-particles Fe 3 O 4 /SiO 2 /KH-550. The structures and properties of the magnetic particles were characterized by the fourier transform infrared spectroscopy (FTIR), X-ray diffraction analyzer (XRD), laser particle size analyzer, and vibrating sample magnetometer (VSM). The results shows that the characteristic peaks of Si-O-Si, KH-550, and P (AM-MMA) all were displayed in the infrared spectra, respectively. Surface modification of nano-particle Fe 3 O 4 does not affect its crystalline structure, and the grafting copolymers P (AM-MMA) were a crystalline polymer. The median diameter of Fe 3 O 4 /SiO 2 /KH-550/P (AM-MMA) is 72.46 um, whose size is larger than particles Fe 3 O 4 and Fe 3 O 4 /SiO 2 . Fe 3 O 4 and its derivatives remain super-paramagnetism, and the saturation magnetization reduced with the increasing the thickness of the modifying material on the surface of Fe 3 O 4 .
研究领域:
材料科学
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化学工程
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DOI
高影响因子
INTEGRATED FERROELECTRICS
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2017
·
IF 0.457
Cheng-Hao Lu,Gui-Huan Chen,Bing Yu,Hai-Lin Cong,Ling-Min Kong,Lin Guo
Core-shell nanoparticles (NPs) became the focus of scientific research in recent years. The design and controllable structures of nanocomposites with core-shell structure become increasingly important research fields at the forefront of materials science recently. In this paper, a series of templates for preparation of core-shell structure such as monodisperse silica (SiO2) NPs and PVP-coated low-cross linked polystyrene (PS) NPs were successful synthesized. In order to further study the key conditions for the formation of core-shell structure, we further prepared Fe3O4@SiO2 nanoparticles. The good properties of the core-shell structure in the field of catalysis, gas separation and biomedicine have a good prospect.
研究领域:
材料科学
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纳米技术
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生物医学工程
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催化化学
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分子影像
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DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Lingwei Li,Huan Wang,Jixiang Fang
Magnetic fluorescent nanomaterials have broad application prospects as taggants in fields such as anticounterfeiting identification, suspicious object tracking, and potential fingerprint recognition in forensic medicine. It is a common method to synthesize magnetic fluorescent composite nanoparticles by preparing a shell on the surface of magnetic particles to load fluorescent materials. In this work, a magnetic fluorescence nanohybrid was synthesized by in situ encapsulation of carbon quantum dots (CQDs) during the preparation of a SiO2 shell on the surface of Fe3O4 nanoparticles. The traditional Stöber method was employed to synthesize the SiO2 shell. Meanwhile, CQDs were introduced into the hydrolysis process of tetraethyl orthosilicate. To address the issue of charge repulsion between the negatively charged hydrolysis intermediate of tetraethyl orthosilicate and the negatively charged CQDs, poly(diallyldimethylammonium chloride) with positive charge was introduced in the synthesis process. The repulsive charges in the reaction system were balanced by poly(diallyldimethylammonium chloride), allowing for the successful encapsulation of CQDs in the SiO2 shell. The structure, morphology, and magnetic and fluorescence properties of the prepared Fe3O4@SiO2–CQDs were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, a vibrating sample magnetometer, and a fluorescence spectrophotometer. The Fe3O4@SiO2–CQDs exhibited excellent magnetic and fluorescence properties, making them suitable for fluorescence labeling on various substrates and showing great potential in labeling, tracing, and fluorescence sensors.
研究领域:
材料科学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
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2013
·
IF 2.224
Kejie Yu,Xuebin Zhang,Hongwu Tong,Xiangyan Yan,Shaomin Liu
Fibrous monodisperse core–shell structured Fe 3 O 4 /SiO 2 /KCC-1 nanoparticles were synthesised successfully through a surfactant-templated microemulsion formation process. The structure and morphology of the synthesised nanoparticles were investigated by scanning electron microscopy , transmission electron microscopy , superconducting quantum interference device susceptometer, X-ray diffraction, thermogravimetric analysis and N 2 adsorption/desorption. These nanoparticles showed monodisperse spherical morphology, high magnetism , good thermal stability , large surface area , direct channels, easily accessible large pores and narrow size distribution. A mechanism for the synthesis of these nanoparticles was proposed and explained. Adsorption experiments indicated that the as-prepared materials had good adsorption capacity for dye and could perform a fast transfer of molecules, indicating its promising application in purification of industrial wastewater, drug delivery and so on.
研究领域:
纳米医学
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材料科学
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环境工程
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生物材料
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药剂学
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胶体与界面化学
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 109
·107732-107738
·
IF 3.289
Zhifen Deng,Kai Hu,Liangliang Bi,Hang Yuan,Yanlong Chen,Shengnan Zhao,Huifang Du,Xuesheng Yuan,Yanjie Huang,Shusheng Zhang
Selective removal of highly abundant proteins prior to analysis is an important issue in proteomics. In this study, a core–shell structured magnetic nanocomposite of Fe3O4@SiO2@MAsp-HEMA was found to be an effective and selective adsorbent to remove highly abundant IgG from the urine of patients with proteinuria. This novel magnetic adsorbent was prepared by coating a poly(N-methacryloyl-L-aspartic acid-hydroxyethyl methacrylate) shell on Fe3O4@SiO2 nanoparticles via a coupling agent of KH-570 using the mini-emulsion polymerization method. The as-synthesized nanoparticle was characterized by X-ray diffraction, elemental analysis, thermal gravimetric analysis, infrared spectroscopy, magnetic hysteresis loop curves, scanning electronic microscopy and transmission electron microscopy. A kinetic adsorption experiment was performed to investigate the speed of adsorption and the time to reach the adsorption balance. 1D SDS-PAGE analysis and capillary electrophoresis were used to validate its selective adsorption ability. The resulting Fe3O4@SiO2@MAsp-HEMA showed a uniform spherical shape at nanoscale dimensions of about 200–300 nm, removing efficiency above 80%, and maximum adsorption capacity of 18.08 μg mg−1 at 15 ± 0.5 °C. The binding between IgG and the ligand was confirmed by isothermal titration calorimetry. The hydrogen bonding force was demonstrated as one of the major interactions between the functional groups of the as-synthesized magnetic nanoparticles and IgG by a molecular docking experiment.
研究领域:
蛋白质组学
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纳米技术
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材料科学
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Pan Zhang,Changmei Wu,Lan Xie,Bai Xue,Yi Jiang
Considering the current challenges associated with fossil fuel scarcity and ice accumulation on solid surfaces, we propose a sustainable strategy that utilizes solar energy for ice formation, using a superhydrophobic coating possessing photothermal capabilities to tackle the challenges of icing and de-icing. We have successfully integrated the Fe 3 O 4 @SiO 2 @FAS/Ag-rGO composites into an epoxy matrix to create a photothermal superhydrophobic coating. The innovative coating boasts outstanding super-hydrophobicity with a water contact angle of 153.8°, resulting in a 60 μL water droplet experiencing a freezing delay of 1498 s at −20 °C ambient conditions, which is longer than that of pure EP coating. Additionally, the coating exhibits an impressive photothermal effect, raising the surface temperature to 58.8 °C under 1 sun. The coating also demonstrates rapid de-icing capabilities, clearing ice in just 120 s under 40 mW/cm 2 . By leveraging the light-trapping effect, utilizing the plasma resonance of silver, and incorporating a high surface roughness micro-nano hierarchical structure, the coating achieves exceptional photothermal conversion efficiency and anti-icing performance. Moreover, the coating's chemical and mechanical durability enhance its practicality and potential utility across various applications. In conclusion, this innovative superhydrophobic coating with photothermal properties offers a promising solution for various practical applications such as anti-icing and de-icing.
研究领域:
材料科学
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能源科学
·
表面工程
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DOI
高影响因子
ACS Omega
·
2018
·
IF 0
Qiangying Zhang,Man He,Beibei Chen,Bin Hu
In this paper, magnetic mesoporous carbon composites were prepared by calcination of the mixture of magnesium citrate and Fe3O4@SiO2 in an inert atmosphere. A high content of Fe3O4@SiO2 and MgO was in situ embedded in a carbon matrix. After removing the MgO template by diluted acid, the resulting material (Fe3O4@SiO2@mC) was subjected to further H2O2 oxidation treatment. The formed oxygen-containing functional groups on the products provided plenty of active sites for the adsorption of analytes of interest. The obtained composites (Fe3O4@SiO2@mC-H2O2) exhibited a mesoporous structure with a high specific surface area of 731 m2 g–1. The adsorption capacities of Fe3O4@SiO2@mC-H2O2 for Cu(II) and Pb(II) were calculated to be 86.5 and 156 mg g–1, respectively. Under optimal conditions, the adsorption isotherm of Cu(II) and Pb(II) onto Fe3O4@SiO2@mC-H2O2 fitted the Langmuir model and the adsorption kinetic was well-correlated with the pseudo-second-order model. Besides, Fe3O4@SiO2@mC-H2O2 exhibited fast removal dynamics (within less than 1 min) for Cu(II) and Pb(II), demonstrating great application potential in wastewater treatment.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Xiu-Ping He,Zi-Ru Lian,Li-Ju Tan,Jiang-Tao Wang
Highly selective and efficient magnetic molecularly imprinted polymers (MMIPs) were prepared using Fe 3 O 4 @SiO 2 as a magnetic supporter, 3-methacryloxypropyltrimethoxy-silane (MPS) as a silane coupling agent, DIS as a template, methacrylic acid (MAA) as a functional monomer and ethyleneglycol dimethacrylate (EGDMA) as a cross-linker for the extraction of trace residuals of the synthetic estrogen dienestrol (DIS) in seawater, which is a concern worldwide for its endocrine disruption and carcinogenic danger to human health. The obtained MMIPs were demonstrated to have spherical morphologies, core-shell structures, large binding capacities, high efficiency and selectivity. These were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and adsorption experiments. Owing to the specific binding sites, the MMIPs exhibited an almost three times higher adsorption capacity towards DIS (Q max = 4.68 mg g −1 ) than magnetic molecularly non-imprinted polymers (MNIPs) (Q max = 1.72 mg g −1 ). DIS in spiked seawater samples from the Weihai Bay of China was extracted and enriched by MMIPs, and satisfactory recoveries (87.3%–96.4%) with low relative standard deviation (RSD) values (2.03%–5.18%, n = 5) were obtained. The limit of detection (LOD) of the method obtained was 0.16 μg L −1 , and the limit of quantitation was 0.52 μg L −1 after MMIPs. No significant deterioration of the adsorption capacity of the MMIPs was observed after six rounds of regeneration. The results further demonstrated the applicability of the MMIPs method, a simple and straightforward method for the extraction and enrichment of DIS in seawater without any time-consuming procedures.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 11
·7413-7424
·
IF 3.9
Xinyu Zheng,Cong Shen,Yongfu Guo,Huaili Zheng
As emerging contaminants, tetracyclines pose a severe threat to aquatic environments and human health. Therefore, developing efficient approaches to remove tetracyclines from water has attracted a large amount of interest. Herein, a novel core–shell structural magnetic nanoadsorbent (FSMAS) was facilely prepared by graft copolymerization of acrylamide (AM) and sodium p-styrene sulfonate (SSS) monomers on the surface of vinyl-modified Fe3O4@SiO2 (FSM). From single factor experiments, the optimal graft copolymerization conditions were concluded to be the following: initiator concentration = 1.2‰, reaction pH = 9, monomer molar ratio = 7 : 3. The surface morphology, microstructure and physicochemical properties of as-prepared FSMAS were fully evaluated by different characterization techniques, including SEM, TEM, FTIR, XPS, XRD and VSM. The adsorption performance of FSMAS towards tetracycline hydrochloride (TCH) was systematically studied by batch adsorption experiments. Results showed that the adsorption capability of the adsorbent was largely enhanced after graft copolymerization. The removal rate of TCH by FSMAS reached 95% at solution pH = 4.0, almost 10 times higher than FSM. Besides, the adsorption process of TCH by FSMAS was very efficient, 75% of pollutant could be adsorbed after only 10 minutes, attributed to the stretch of polymer chains and the strong affinity provided by abundant functional groups. Furthermore, TCH-loaded FSMAS was easily regenerated with HCl solution, the regeneration rate was higher than 80% after five adsorption–desorption cycles. Superior adsorption capability, fast solid–liquid separation speed and satisfactory reusability demonstrated the great potential of FSMAS in practical tetracycline removal.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Jianfei Zhang,Chengyi Chu,Aihua Sun,Si Ma,Xuanxuan Qiao,Chongyang Wang,Jianjun Guo,Zhixiang Li,Gaojie Xu
The double-sided structural color of Fe 3 O 4 @SiO 2 NPs under external electric field was found. Corresponding colloidal suspension of Fe 3 O 4 @SiO 2 showed a highly adjustable structure color change on both sides of the display cell with the applying of electric fields. As the applied voltage increased, the color changed from red to green then to blue at positive plate, at the same time, the color changed from red to gray then to red at the negative plate. Under a certain electric field, the reflection peak move backwards within a particular range of wavelength. It may be caused by the emergence of another repulsive force-“solvation force” at small interparticle distances.
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DOI
高影响因子
危险品化学品经营许可证（带存储）