RSC Advances
·
2018
·Vol. 8
·期 69
·39641-39649
·
IF 2.936
Hui Li,Zhen Cao,Xiaolin Cao,Zejun Jiang,A. M. Abd El-Aty,Yan Qi,Hua Shao,Fen Jin,Lufei Zheng,Jing Wang
Two types of magnetic microspheres (Fe3O4@MIL-100 and Fe3O4@SiO2@polythiophene) were prepared and characterized as mixed sorbents for magnetic solid-phase extraction (MSPE) of six phthalic acid esters (PAEs), including dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), benzyl butyl phthalate (BBP), di-2-ethylhexyl phthalate (DEHP), and di-n-octyl phthalate (DnOP) from water samples prior to gas chromatography-mass spectrometry (GC-MS) analysis. The synthetic magnetic nanocomposites exhibited good repeatability and chemical stability, and improved extraction efficiency for the tested PAEs. The mixture of the two types of nanoparticles substantially improved the extraction efficiency of both DMP and DEP. The key parameters affecting the extraction efficiency, such as the type and the amount of sorbent, eluent (desorption solvent), adsorption and desorption time, pH of sample solution, and sample volume, were investigated and optimized, respectively. Under optimized conditions, the developed method showed satisfactory linearity in the range of 5–5000 μg L−1 with coefficients of determination (R2) > 0.9935. The method detection limits (MDLs) and limits of quantitation (LOQs) were between 0.35–0.91 μg L−1 and 1.1–2.9 μg L−1, respectively. At three fortification levels (1.0, 10.0, and 50.0 μg L−1), the mean recoveries ranged from 76.9–109.1% with favorable relative standard deviations (RSDs) < 9%. The feasibility of the method was evaluated by analysis of water samples from various sources (tap, drinking, and mineral water). The results show that the developed method is suitable for determination of trace level PAEs in water samples.
研究领域:
分析化学
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环境科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Huan Wang,Cen Shi,Liangliang Yin,Yanqin Ji
To remove lutetium from wastewater, superparamagnetic Fe 3 O 4 @SiO 2 –HOPO nanoparticles were successfully synthesized, containing approximately 460 μmol·g −1 of 3,2-HOPO. The material demonstrated high stability in 0.1 mol·L −1 HNO 3 and retained 97 % of its adsorption capacity after five cycles. The nanoparticles showed strong selectivity for lutetium, with minimal interference from coexisting ions in different matrices. This selective adsorption was primarily due to monodentate or multidentate chelation of 3,2-HOPO on the particle surface with lutetium. Adsorption equilibrium was achieved within 15 min, with a maximum capacity of 29 mg·g −1 , highlighting its potential for large-scale wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2013
·Vol. 69
·期 1
·170-176
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IF 1.102
Yang Jiannan,Li Shuzhen,Gong Yibin,He Chun,Zhang Qiong,Wu Jinqing,Liao Weichen,Shu Dong,Tian Shuanghong
Molecularly imprinted Fe 3 O 4 /SiO 2 core-shell magnetic composites (Fe 3 O 4 /SiO 2 -MIP) were successfully prepared via anchoring p -nitrophenol ( p -NP) imprinted functional polymers on the surface of amino-modified Fe 3 O 4 /SiO 2 core-shell particles. Synthesized magnetic Fe 3 O 4 /SiO 2 -MIP composites were characterized by X-ray diffraction, scanning electronic microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and magnetic property measurement. The preferential catalytic ozonation of p -nitrophenol was evaluated in comparison with the competitive reaction in the presence of coexistent phenol. The results showed that the prepared Fe 3 O 4 /SiO 2 -MIP composites exhibit strong adsorption ability due to the strong bonding between p -NP and the molecularly imprinted layer. The Fe 3 O 4 /SiO 2 -MIP demonstrated a preferential catalytic ozonation of p -NP by the recognition ability of the molecularly imprinted layer to the target p -NP. The enhanced catalytic activity using Fe 3 O 4 /SiO 2 -MIP composites could be attributed to the excellent recognition absorption of the MIP layer on the surface of Fe 3 O 4 /SiO 2 -MIP to p -NP.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 12
·7098-7107
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IF 3.094
Chong Gu,Changqing Guo,Xichao Dong,Zhiming Hu,Pengfei Wu,Zhiming Su,Yingxi Lu,Binbin Xu,Zhaoju Yu,Anhua Liu
In this work, novel core-shell structured Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles were fabricated via a polymer-derived ceramic approach, starting from sol-like polycarbosilane-encapsulated polynuclear carbonyl iron nanoparticles and with pitch as an isolator to avoid aggregation during polymer-to-ceramic transformation. Elemental analysis, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscope, vibrating sample magnetometer and vector network analyzer were employed to investigate the composition, nano/microstructure, morphology, and dielectric/magnetic properties. The results show that the size of obtained Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles is in the range of 2-200 nm. And the unique core-shell structure with the hetero-interface combined with simultaneous dielectric and magnetic loss endow Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles outstanding electromagnetic (EM) wave absorbing performance. With a sample thickness of 4.5 mm, the minimum reflection coefficient (RC) of the composites Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 mixed with paraffin wax reaches −44.7 dB, indicating that more than 99.99% EM waves can be attenuated by the composites. By adjusting the sample thicknesses, the effective bandwidth (the bandwidth of RC values lower than −10 dB) amounts 9.5 GHz (from 2.5 to 12.0 GHz), covering the whole C and X bands.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 26
·265603
·
IF 3.874
Jianwei Zheng,Liying Zhang,Yang Li,Hong-Bin Sun,Gang Zhang,Qi Sun
Core–shell nanocomposites with a catalytic metal-organic framework (MOF) shell are more effective and stable than bare MOF. We have successfully designed an effective heterogeneous catalyst for the synthesis of benzimidazole by integrating acidic catalytic activity, and promoted the aerobic oxidation and magnetic recyclability of core–shell nanocomposite Fe3O4@SiO2@UiO-66. The Fe3O4@SiO2 core is encapsulated by the in situ-grown UiO-66 shell, and the UiO-66 shell retains the porous structure and crystallinity of UiO-66 with abundant exposed Lewis acid sites. It shows high catalytic ability for the synthesis of various benzimidazoles through the acid-catalyzed condensation and aerobic oxidation with in situ oxygen. The Fe3O4@SiO2 core provides magnetic recyclability of Fe3O4@SiO2@UiO-66, and maintains high catalytic ability and stability over six cycles.
研究领域:
材料科学
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催化化学
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有机合成
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产品关联
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Yajing Yang,Fenglin Li,Dayin Sun,Yilan Ye,Zhenzhong Yang
A new method is proposed to large-scale synthesize reactive Janus inorganic/polymer colloidal dimers by electrostatics-mediated intramolecular crosslinking of the tethered diblock copolymer single-chain of PVSt-b-PmSt at an example inorganic NP of Fe3O4@SiO2. Tethering the single-chain is achieved by terminating the anionic living polymer onto the chloromethylphenyl- group capped NP. While the electrostatic interaction is introduced by complexation of the mercaptoacetic acid (MA) clicked PVSt block with 1-methylimidazole (MI), the intramolecular crosslinking is achieved with 1,6-hexanediisothiocyanate (HDI). The example dimer of cPVSt-b-PmSt-Fe3O4@SiO2 could be synthesized in a highly concentrated dispersion up to 100 mg/mL. The amphiphilic Janus colloidal dimer is effective to manipulate the stabilized emulsion droplets with a magnet. The parent colloidal dimer is highly reactive with residual chloromethylphenyl-, cyanate, and carboxylic acid groups at different sites to assist deriving a family of functional dimers by simple modifications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yinghui Fan,Wenqing Wang,Abdul Haleem,Jianming Pan,Hao Li
Creating uniform magnetic covalent organic framework (MCOF) adsorbents for effectively capturing and separating gold presents a considerable challenge. However, achieving this uniformity is crucial for resource recycling and environmental protection. This study introduces a monomer-mediated in situ layer-by-layer growth strategy employing a timed injection method for fabricating magnetic covalent organic frameworks. The hybrid MCOFs produced, Fe 3 O 4 @SiO 2 @COF and Fe 3 O 4 @SiO 2 @COF-DMSA, possess abundant binding sites that enhance adsorption capacities, rapid kinetics, and remarkable regeneration performance for gold recovery. Significantly, the Fe 3 O 4 @SiO 2 @COF exhibits a lower gold adsorption capacity (898 mg g −1 ), whereas Fe 3 O 4 @SiO 2 @COF-DMSA exhibits an improved Au (III) selectivity and a larger capacity for adsorption (1116 mg g −1 ). The capturing mechanism of Au (III) by Fe 3 O 4 @SiO 2 @COF-DMSA is predominantly attributed to coordination and reduction, as identified through XPS analysis. This study motivates conceptualizing molecular/ionic capture strategies using core–shell NP/COF hybrid materials to retrieve precious metals.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Zahra Nozhat,Shibo Wang,Asim Mushtaq,Tianhao Deng,M. Zubair Iqbal,Xiangdong Kong
Recently, nanoparticles (NPs) have been employed to enhance the distribution of new medications across the BBB. In this study, a synergistic nanoassembly has been prepared for magnetic resonance imaging-guided chemo-phototherapy of glioblastoma multiforme (GBM). In accordance, Fe 3 O 4 NPs are prepared with SiO 2 shell followed by the loading of an anticancerous drug temozolomide (TMZ) to generate Fe 3 O 4 @SiO 2 /TMZ NPs. Later, drug-loaded NPs are coated with platelet membrane (PLTM) to develop the final biocompatible form of nanoassembly as Fe 3 O 4 @SiO 2 /TMZ@PLTM NPs for synergistic therapy of GBM. We combined chemotherapy with photothermal therapy in a magnetically targeted TMZ-loaded Fe 3 O 4 @SiO 2 core-shell that was activated by near-infrared irradiation and then developed platelet membrane-coated Fe 3 O 4 @SiO 2 /TMZ to improve the precise delivery of drugs into GBM cells and enable a more efficient photothermal therapy. According to the cellular uptake findings, the Fe 3 O 4 @SiO 2 /TMZ@PLTM NPs possess a greater uptake compared to the uncoated Fe 3 O 4 @SiO 2 /TMZ NPs owing to the targeted binding of P-selectin on the surface of the PLTM to the CD44 receptors of GBM cells. Moreover, the nanoassembly has displayed a pH-responsive drug release and an excellent photothermal effect under NIR (808 nm, 1 W/cm 2 ) irradiation. After 10 min of irradiation, the temperature has been elevated to about 65 °C leading to the death of 80% of GBM cells in vitro. Additionally, the fabricated NPs possess a remarkable contrasting property for T 1 -weighted magnetic resonance imaging (MRI) due to the presence of superparamagnetic iron oxide NPs. These findings demonstrate the promising theranostic behaviour of fabricated Fe 3 O 4 @SiO 2 /TMZ@PLTM NPs for synergistic therapy of glioblastoma multiforme (GBM).
研究领域:
医学
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生物材料学
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肿瘤学
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纳米医学
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产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 329
·期 1
·253-263
·
IF 1.371
Zhou Weini,Wang Hongqing,Hou Sanying,Wang Shiyv
A magnetic nano-composites Fe 3 O 4 @SiO 2 @MnO 2 were fabricated for efficient removal of Th(IV) from aqueous solutions, and characterized by SEM, TEM, XRD, FT-IR, BET, VSM, TGA and XPS. And the sorption of Th(IV) on Fe 3 O 4 @SiO 2 @MnO 2 were investigated as a function of pH, adsorbent dosage and initial Th(IV) concentration. The results showed that the adsorption maximum was 53.19 mg g −1 for Th(IV) at pH = 3.5 and T = 298 K. In addition, the adsorption kinetics followed the second-order kinetic model, and the adsorption isotherm could be perfectly depicted by the Langmuir model. Finally, XPS analysis illustrated that the lattice oxygen (M–O) and the surface hydroxyl oxygen (M–OH) participated in adsorption. In brief, the Fe 3 O 4 @SiO 2 @MnO 2 material could efficiently eliminate Th(IV) from aqueous solutions, which might become a promising material for adsorbing Th(IV) from environmental wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
·
2012
·Vol. 3
·期 4
·1082-1088
·
IF 0
Zhengping Dong,Xin Tian,Yuanzhe Chen,Yueping Guo,Jiantai Ma
In the present work, a novel dansyl group functionalized Fe3O4@SiO2 magnetic nanomaterial with a core–shell structure was developed, aiming to detect and remove Hg2+ from aqueous media. The multifunctional nanocomposite shows excellent fluorescence sensitivity and selectivity towards Hg2+ over other metal ions (Na+, K+, Mg2+, Al3+, Ca2+, Cd2+, Ni2+, Co2+, Fe3+, Zn2+, Pb2+, Cu2+, Ag+). Concentrations as low as 10−8 M can be detected and the addition of other metal ions has a negligible influence on the fluorescence emission. Regarding the reversibility of the nanosized sensor, the fluorescence of the DAP-Fe3O4@SiO2 nanocomposite in the presence of Hg2+ ions is found to be almost reversible when treated with iodide anion. Additionally, the nanocomposite can be easily separated from solutions by adding an external magnetic field. Moreover, the functionalized nanosphere shows a good adsorption capacity to Hg2+, which makes it repeatedly applicable for simultaneous Hg2+ sensing and removal from polluted water. These results indicate that the multifunctional nanocomposite may find potential applications for simple detection and easy removal of Hg2+ in biological and environmental areas.
研究领域:
环境科学
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分析化学
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纳米材料
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传感器与检测
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水处理
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DOI
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·Vol. 34
·期 6
·2432-2444
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IF 3.9
Xia Tianhao,Wang Yunpeng,Awasthi Pragati,Dong Wenkun,Li Mengting,Qiao Xvsheng,Chen Dong,Ling Shisheng,Fan Xianping
The separation of target substances is a significant biological detection procedure, where magnetic microspheres can act as high-performance separation materials. However, challenges are still kept to fulfill all the requirements. A submicron magnetic poly (glycidyl methacrylate) (PGMA) microsphere was synthesized in this investigation by utilizing three distinct techniques: in situ coprecipitation, electrostatic self-assembly, and silica surface coating. The PGMA microspheres were initially produced through a soap-free emulsion polymerization technique, wherein the coagulation process was governed by surface charge density. This factor additionally impacted the size and monodispersity of the microspheres. Then, we discovered that the capping agent sodium citrate (Na 3 Cit) effectively regulated the superparamagnetism properties of magnetic microspheres; the critical size of the superparamagnetic was 10.9 nm. Furthermore, the concentration of Fe 2+ and Fe 3+ effectively regulated the saturation magnetization, a property that correlated with the nucleation rate of the Fe 3 O 4 crystal. Additionally, we demonstrated that the pH regulated the electrostatic self-assembly, and it was suggested that positively charged PGMA–NH 2 microspheres and negatively charged Fe 3 O 4 nanoparticles be tightly coupled. For application, the PGMA@Fe 3 O 4 microspheres were subsequently coated with SiO 2 , which had been surface-modified with carboxyl groups. The PGMA@Fe 3 O 4 and carboxyl-modified microspheres exhibited saturated magnetization values of 23.73 and 17.73 emu/g, respectively. These microspheres have been effectively utilized for the extraction of DNA from various sources such as Salmonella typhi, monkeypox virus, and clinical swab samples, suggesting the potential of these microspheres for nucleic acid separation in the biomedical domain.
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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生物化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2013
·
IF 3.473
Baocun Zhu,Jie Zhao,Haiqin Yu,Liangguo Yan,Qin Wei,Bin Du
A novel 1,8-naphthalimide-functionalized Fe 3 O 4 @SiO 2 core/shell magnetic fluorescent nanoparticles ( MFNPs ) for simultaneous detection and adsorption of Hg 2+ was designed and synthesized. A series of adsorption studies were carried out with various Hg 2+ concentrations, temperature, time and pH. The maximum adsorption capacity is higher than 30 mg/g over a broad temperature (0 °C, 25 °C, and 50 °C) and pH (4–10). The results showed that MFNPs possesses an excellent reusability and the high adsorption specificity toward Hg 2+ . The detection limit for Hg 2+ is 3.4 nM. In addition, owing to the aggregation of MFNPs occurring in the Hg 2+ aqueous solution, the adsorbent was separated easily by the settlement or the external magnetic field, which facilitated the removal of Hg 2+ .
研究领域:
环境科学
·
材料科学
·
分析化学
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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）