RSC Advances
·
2016
·Vol. 6
·期 58
·53080-53088
·
IF 3.289
Jie Liu,Zhiwei Zhao,Zhaoxia Ding,Zhendong Fang,Fuyi Cui
Magnetic Au–Fe3O4 nanocomposites with various Au weight loading were synthesized through a one step strategy. The morphology and physicochemical properties of the as-synthesized solids were characterized through various methods. After that, the catalysts were applied to activate H2O2 for the degradation of 4-chlorophenol (4-CP). The results showed that Au–Fe3O4 can catalyze oxidation of 4-CP efficiently in the presence of H2O2 at pH 5, which may be attributed to the synergistic catalysis in the nanocomposites for hydroxyl radical generation. And then, the influence of reaction parameters on the oxidation of 4-CP, including the Au weight loading of the nanocomposites, pH, catalyst dosage, H2O2 dosage and temperature, were assessed. The stabilization and reusability of the Au–Fe3O4 nanocomposites was shown to be excellent, with no leakage of Au. The hydroxyl radicals (˙OH) were the main reactive radicals released in the Au–Fe3O4/H2O2 system according to the addition of tert-butanol and the spin-trapping electron paramagnetic resonance (EPR) by means of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO), while the ˙OH in the bulk solution acted in the main role for 4-CP degradation. Finally, the mechanism of H2O2 activated with Au–Fe3O4 for 4-CP degradation was proposed.
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TALANTA
·
2016
·
IF 4.035
Songqing Chen,Xingxiu Qin,Weixi Gu,Xiashi Zhu
Ionic liquids-β-cyclodextrin polymer (ILs-β-CDCP) was attached on Fe 3 O 4 nanoparticles to prepare magnetic solid phase extraction agent (Fe 3 O 4 @ILs-β-CDCP). The properties and morphology of Fe 3 O 4 @ILs-β-CDCP were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction(XRD), size distribution and magnetic analysis. A new method of magnetic solid phase extraction (MSPE) coupled to ICP-OES for the speciation of Mn(II)/Mn(VII) in water samples was established. The results showed that Mn(VII) and total manganese [Mn(II)+Mn(VII)] were quantitatively extracted after adjusting aqueous sample solution to pH 6.0 and 10.0, respectively. Mn(II) was calculated by subtraction of Mn(VII) from total manganese. Fe 3 O 4 @ILs-β-CDCP showed a higher adsorption capacity toward Mn(II) and Mn(VII). Several factors, such as the pH value, extraction temperature and sample volume, were optimized to achieve the best extraction efficiency. Moreover, the adsorption ability of Fe 3 O 4 @ILs-β-CDCP would not be significantly lower after reusing of 10 times. The accuracy of the developed method was confirmed by analyzing certified reference materials (GSB 07-1189-2000), and by spiking spring water, city water and lake water samples.
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RSC Advances
·
2016
·Vol. 6
·期 97
·94976-94988
·
IF 3.289
Longfei Liao,Ying Liu,Zengyong Li,Junping Zhuang,Yanbin Zhou,Size Chen
Amino modified Fe3O4@SiO2 (Fe3O4@SiO2–NH2) was used to immobilize Cu2+ and VO2+ for preparing Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalysts. Various technologies had been used for the characteristics of catalysts, such as XRD, XPS, FT-IR, SEM, TEM and VSM. The catalytic performance of Fe3O4@SiO2–NH2–VO2+ in HMF oxidation could be significantly enhanced by the use of Fe3O4@SiO2–NH2–Cu2+ as the co-catalysts. The type of reaction solvents showed a great influence on the oxidation of HMF. The highest HMF conversion reached up to 98.7% at 110 °C in toluene with an optimal 2,5-diformylfuran yield of 85.5%. Moreover, the Fe3O4@SiO2–NH2–Cu2+ and Fe3O4@SiO2–NH2–VO2+ catalyst exhibited great stability and could be readily applied in the next recycle after magnetic separation.
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ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Wenfen Zhang,Yanhao Zhang,Qiong Jiang,Wenjie Zhao,Ajuan Yu,Hong Chang,Ximei Lu,Fuwei Xie,Baoxian Ye,Shusheng Zhang
To satisfy the requirement of simultaneous extraction and characterization of diverse kinds of multitarget analytes, the preparation, characterization, and application of a novel tetraazacalix[2]arene[2]triazine (TCT) coated magnetic nanoparticle (TCT MNP) adsorbent are presented in this paper. TCT assembles two benzene rings and two triazines with nitrogen cross-bridging links, which exhibits a unique structural framework and versatile recognition features based on the multiple recognition sites. These include π electron stacking, charge transfer, hydrogen bonding, and ion-exchange. TCT MNPs acted as a dispersive SPE adsorbent showing strong interaction with and adsorption of polycyclic aromatic hydrocarbons (PAHs), nitroaromatics, and heavy metal ions. The dispersive magnetic nanoparticle solid phase extraction (d-MNSPE) strategy with the simultaneous extraction and stepwise elution (SESE) procedure was designed and optimized for the five PAHs (phenanthrene, anthracene, pyrene, chrysene, and benzo(a)pyrene), six nitroaromatics (4-nitrotoluene, 2,4-dinitrotoluene, 2,4,6-trinitrotoluene, 4-nitrophenol, 2,4-dinitrophenol, and 2,4,6-trinitrophenol), and four metal ions (Cu, Zn, Mn, Cd) in aqueous samples. Due to the high stability, desirable durability, larger saturation magnetization, reuse and distinct enrichment capacity of TCT MNPs, the d-MNSPE method with the SESE strategy provided high recovery (>90%) and good precision (relative standard deviations, RSD < 10%). Coupled with the commonly used HPLC-fluorescence detection, HPLC-UV detection, and atomic absorption spectrometry, these trace probes in tap water, river water, and lake water were determined with very low detection limits, in the range of 0.09–0.15 pg mL–1 for PAHs, 6–11 pg mL–1 for nitroaromatics, and 17–53 pg mL–1 for metal ions after being enriched by the d-MNSPE. The determination of trace PAHs in urine samples from smokers and nonsmokers was successfully carried out with this method, which implied that the versatile TCT MNPs and the robust method together represent a significant potential application in the analysis of body fluids and disease markers. Such methods for accurate quantification of trace components in water are very valuable as they fulfill an unmet need in environmental and medicinal chemistry.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Weihao Ma,Hao Zhang,Jiayuan Nie,Chunyu Qiang,Zhiwei Li,Ling Ma,Ke Wang
In this study, a novel magnetic covalent organic framework (Fe 3 O 4 @SiO 2 -HBTA-TTA-COF) was synthesized, which was fully characterized by scanning electron microscopy, transmission electron microscopy, etc. Furthermore, a new method was developed for the determination of 25 quinolones (QNs) in water and milk using the Fe 3 O 4 @SiO 2 -HBTA-TTA-COF as magnetic solid-phase extraction adsorbent coupled with ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Meanwhile, various experimental parameters were optimized including sample solution pH, adsorbent dosage and extraction time, etc. Under the optimal conditions, good linearity in the range of 0.1–200 μg·L −1 (R 2 ≥ 0.999) were obtained, the recoveries of 25 QNs were 70.04 %–104.4 % with the relative standard deviations lower than 9.87 % (n = 5), the limits of detection were 0.003–0.010 μg·L −1 for water and 0.018–0.722 μg·kg −1 for milk. This established method was high-sensitive and high-throughput, which can be used as a good alternative method for the selective determination of 25 QNs in water and milk.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yunxiang Bai,Xinxue Qiu,Deqiang Chen,Junwei Zheng,Liangliang Dong,Chunfang Zhang
Magnetic mixed matrix membranes (MMMs) show great potential for enhancing O 2 /N 2 separation efficiency by leveraging the inherent magnetic property differences between O 2 (paramagnetic) and N 2 (diamagnetic). However, one of the major challenges is the establishment and precise control of magnetic channels between magnetic fillers and polymer matrix. To address this issue, herein, ZIF-8 wrapped Fe 3 O 4 nanoparticles (Fe 3 O 4 @ZIF-8) were synthesized using a step-by-step assembly method, and then integrated into polymer of intrinsic microporosity (PIM-1) matrix to develop MMMs with well-defined magnetic channels for O 2 /N 2 separation. In comparison with Fe 3 O 4 , Fe 3 O 4 @ZIF-8 nanoparticles exhibited significantly enhanced compatibility with the polymer matrix, thereby facilitating uniform dispersion and improving interfacial adhesion. Gas permeation experiments revealed that the magnetic PIM-1/Fe 3 O 4 @ZIF-8 MMMs demonstrated enhanced O 2 /N 2 separation performance due to the combined effects of magnetic responsiveness and the presence of ZIF-8 magnetic channels. Under a magnetic field strength of 56mT, the magnetic MMM with a 4 wt% loading of Fe 3 O 4 @ZIF-8 exhibited optimal O 2 /N 2 separation performance with O 2 permeability of 710 Barrer and O 2 /N 2 selectivity of 3.64. These values represented a significant improvement of 42% and 24%, respectively, compared to pure PIM-1 membrane. Moreover, the simultaneous improvement of permeability and selectivity enabled the achievement of Robeson’s 2008 upper bound for O 2 /N 2 separation, underscoring the great potential of Fe 3 O 4 @ZIF-8 nanoparticles for designing magnetic MMMs with favorable structural attributes and exceptional separation efficiency.
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NPG Asia Materials
·
2017
·Vol. 9
·期 5
·e383
·
IF 9.157
Yin Ting,Zhang Qian,Wu Haigang,Gao Guo,Shapter Joseph G,Shen Yulan,He Qiaozhi,Huang Peng,Qi Wen,Cui Daxiang
Effectively prolonging the residence time of nanoprobes in the tumor region and reducing the accumulation of nanoprobes in the vital organs (for example, lung, liver and spleen) is crucial for high-efficiency photodynamic therapy (PDT) of cancer. Herein, we systematically report an ultra-small and highly stable nanoplatform with diameters of 4, 8 and 13 nm that exhibited excellent photodynamic therapeutic efficacy using Fe 3 O 4 @polymer-NPO/PEG-Glc@Ce6 nanoprobes. Based on the small size effect, the nanoprobes displayed lower cytotoxicity and excellent biocompatibility. Owing to the synergistic virtues of markedly active targeting and intrinsic small size effect, the Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes can effectively prolong their residence time in the tumor region and reduce accumulation in the normal organs. Benefitting from the small size effect, the synthesized Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes exhibited excellent tumor-targeting capability and photodynamic therapeutic efficacy by inhibiting the growth of tumors in mice under visible red light irradiation with a relatively lower power. The successful application of the small size effect in Fe 3 O 4 @P-NPO/PEG-Glc@Ce6 nanoprobes to significantly improve the PDT efficiency in our strategy suggests new building blocks for PDT of tumors and paves a new way for clinical therapies and translation in the near future.
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Desalination and Water Treatment
·
2024
·
IF 1
Dezhi Qin,Wenhui Hu,Li Zhang
The Fe 3 O 4 /NiO magnetic nanomaterials were prepared by microwave-assisted and hydrothermal synthesis in β-cyclodextrin (β-CD) solution, which can be employed as absorbents and photocatalysts for the degradation of Congo red (CR). The XRD, EDX and TEM characterizations were used to determine the structure, composition and morphology of the as-prepared samples. The interaction between Fe 3 O 4 /NiO nanoparticles and β-CD molecules was investigated by TGA and FT-IR spectra. The results indicate that β-CD molecules can encapsulate the as-prepared nanoparticles and control the nucleation and growth of Fe 3 O 4 /NiO nanocrystals to certain extent. The pyrolysis of β-CD molecules and calcination treatment produced porous structure that provides more adsorption sites for CR molecules. The effect of reaction factors including calcination temperature and pH values was studied to determine the optimum condition. In addition, the thermodynamic and kinetic parameters of CR absorbed on Fe 3 O 4 /NiO nanoparticles were measured to understand the adsorption mechanism. The high removal efficiency for CR in aqueous solution was achieved within 60 min of adsorption and 40 min of UV-light irradiation, which can be attributed to the synergistic effect of the adsorption–photodegradation process. The prepared Fe 3 O 4 /NiO nanocrystals exhibit high adsorption capacity, magnetic separability, good photocatalytic activity and renewability, making it a potential material for wastewater treatment.
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TALANTA
·
2025
·
IF 6.1
Zihan Huang,Hongfeng Lu,Hui Dong,Zhiao Chen,Renwei Lu,Yangguang Zhao,Yanru Du,Yuhan Liu,Yuhan Wu,Maotian Xu,Yanfeng Bi,Yanli Zhou
Pre-designed core-shell metal-organic frameworks (MOFs@MOFs) with customized functionalities can enhance the material properties compared to conventional single MOFs. The porous carbon composites derived from MOFs@MOFs also have excellent functionality due to the presence of multiple metal/metal oxide nanoparticles. This paper synthesized a novel MOFs@MOFs composite (MIL-101(Fe)@Ni-MOF) with a core-shell structure with MIL-101(Fe) as the core and Ni-MOF as the shell. After pyrolysis of the above composite, nitrogen-doped porous carbon (Fe 3 O 4 /Ni@NPC) anchored with Fe 3 O 4 nanoparticles and Ni nanoparticles with synergistic catalytic effects were constructed. Fe 3 O 4 /Ni@NPC exhibited synergistic catalytic effects for the synchronous and ultra-sensitive detection of dopamine (DA) and 5-hydroxytryptamine (5-HT) with a detection limit of 0.165 μM for DA and 0.327 μM for 5-HT. Highly accurate and sensitive target detection was also achieved in experiments with human serum and PC12 cells, which was of great clinical importance.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Keyan Liu,Wei Feng,Yanru Li,Donglai Han,Tianna Wu,Kaiyue Li,Shuo Yang
Surface-enhanced Raman spectroscopy (SERS) with enormous advantages has emerged as a powerful tool for both highly sensitive structural detection of analytes and various imaging applications. A notable advancement in the realm of multifunctional SERS substrates is the integration of magnetic nanoparticles endowed with magnetic manipulation capabilities and noble metal nanoparticles exhibiting plasmonic resonance properties. This synergistic combination offers substantial practical benefits for trace analysis across diverse fields. In this paper, a new paradigm of Fe 3 O 4 @PEI-DTC-Ag (Fe 3 O 4 @PD-Ag) photomagnetic nanocomposites based on magnetic Fe 3 O 4 nanoparticles (NPs), the noble metal silver quantum dots (Ag QDs) and the adhesive layer polyethyleneimine dithiocarbamate (PEI-DTC) for convenient recycling and ultrasensitive SERS detection was developed by engineering hydrothermal and seed-growth methods. The SERS performance of the Fe 3 O 4 @PD-Ag substrates with varying amounts of Ag was evaluated by detecting 4-aminothiophenol (4-ATP). Among the tested samples, Fe 3 O 4 @PD-Ag-4 with a silver solution volume of 200 ml exhibited the optimal performance, showcasing an enhancement factor ( EF ) of 4.418 × 10 5 . Moreover, the relative standard deviations (RSDs) were calculated to be less than 11.5 %, demonstrating the SERS substrates exhibit good uniformity and spectral reproducibility. Of note, the SERS substrate has demonstrated successful trace detection of thiram molecules, achieving a limit of detection (LOD) of up to 10 -9 M. The intensity of SERS signals shows a linear correlation with the logarithm of thiram concentration, ranging from 10 -4 to 10 -9 M, thus providing compelling evidence for quantitative detection. Importantly, the Fe 3 O 4 @PD-Ag-4 SERS substrate also showcases outstanding performance for detecting thiram in real food, underscoring its significant potential for application in food safety monitoring.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Ke Deng,Haixia Hu,Yi Li,Xue Li,Huiling Deng,Ya Chen,Xiao Yang,Lijun Wang,Xianggui Chen
In this study, a dual-mode colorimetric/CL nanosensor was developed for glyphosate detection based on the specific inhibition of Fe 3 O 4 @Cu peroxidase-like activity. Synthesized Fe 3 O 4 @Cu exhibited high levels of peroxidase-like activity that triggered the oxidation of luminol/3,3′,5,5′-tetramethyl benzidine dihydrochloride (TMB) to excited-state 3-aminophthalic acid/blue oxTMB, thereby delivering a CL signal/visible colorimetric signal, however, the presence of glyphosate inhibited this activity, resulting in a decrease in signal strength. In-depth investigation revealed that this inhibitory mechanism occurs via two pathways: one in which glyphosate chelates with Fe(III)/Cu(II) and occupy the catalytical active sites of Fe 3 O 4 @Cu, thereby decreasing the generation of OH, and another in which glyphosate competes with TMB to consume generated OH, thus reducing the oxidation of TMB. This mechanism formed the basis of our novel dual-mode colorimetric/CL glyphosate nanosensor, which achieved limits of detection (LODs) of 0.086 µg/mL and 0.019 µg/mL in tests, thus demonstrating its significant potential for on-site glyphosate monitoring.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-13
·
IF 10.6
Lian Jingge,Li Meng,Duan Meng,Sun Yaqian,Wang Zilin,Guo Xinyu,Li Jingchao,Gao Guo,Li Kangan
Adoptive cellular immunotherapy as a promising and alternative cancer therapy platform is critical for future clinical applications. Natural killer (NK) cells have attracted attention as an important type of innate immune regulatory cells that can rapidly kill multiple adjacent cancer cells. However, these cells are significantly less effective in treating solid tumors than in treating hematological tumors. Herein, we report the synthesis of a Fe3O4-PEG-CD56/Avastin@Ce6 nanoprobe labeled with NK-92 cells that can be used for adoptive cellular immunotherapy, photodynamic therapy and dual-modality imaging-based in vivo fate tracking. The labeled NK-92 cells specifically target the tumor cells, which increases the amount of cancer cell apoptosis in vitro. Furthermore, the in vivo results indicate that the labeled NK-92 cells can be used for tumor magnetic resonance imaging and fluorescence imaging, adoptive cellular immunotherapy, and photodynamic therapy after tail vein injection. These data show that the developed multifunctional nanostructure is a promising platform for efficient innate immunotherapy, photodynamic treatment and noninvasive therapeutic evaluation of breast cancer.
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