FOOD CHEMISTRY
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2021
·
IF 7.514
Wei Yang,Chenyuan Weng,Xiaoyun Li,Wei Xu,Jianwen Fei,Junli Hong,Jun Zhang,Wanying Zhu,Xuemin Zhou
Herein, using Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) as a magnetic artificial peroxidase, an “on–off” ratiometric photoluminescence sensor with high-sensitivity and high-selectivity for coumarin was constructed based on photoinduced electron transfer (PET) between 7-hydroxycoumarin and rhodamine B (RB). The results showed that Fe 3 O 4 NPs catalyzed H 2 O 2 to generate nucleophilic group ·OH, which attacked the active site of coumarin and produced strong fluorescent 7-hydroxycoumarin molecules. Then, the fluorescence of RB was quenched with 7-hydroxycoumarin through the PET effect. The ratio signal generated in the above process was used for the quantitative detection of coumarin. Under optimized conditions, the linear range 0.5–25 mg/L was acquired for coumarin with the detection limit of 0.016 mg/L. This method had excellent selectivity and the recovery rate was 81.8%−106.8% with the relative standard deviation less than 5.6%, so it can be used for the quantitative analysis of coumarin in complex matrix samples.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Mingying Ma,Tianhao Wu,Zhian Hu,Gongwei Sun,Sichun Zhang
High-throughput sample preparation is important in clinical mass spectrometry (MS) analysis. In this work, we developed a method by coupling Nano-ESI-MS with magnetic SPE using a MOF material, Fe 3 O 4 @UiO-66, as sorbent for simultaneous determination of testosterone (T) and androstenedione (4-AD) in serum samples. The proposed method presented good linearity in the range of 0.1–5 μg/L and the recoveries of serum samples were 90.7%-110.0% and 101.7%-108.7% for T and 4-AD, respectively. The results indicated that the Fe 3 O 4 @UiO-66 is an ideal sorbent for androgens extraction and the method is reliable for high-throughput quantitation of T and 4-AD in clinical applications.
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Nano Research
·
2021
·Vol. 14
·期 7
·2363-2371
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IF 8.897
Lv Yan,Yue Lin,Khan Imran Mahmood,Zhou You,Cao Wenbo,Niazi Sobia,Wang Zhouping
Herein, we report the fabrication of Fe 3 O 4 @TiO 2 nanosheet/Ag/g-C 3 N 4 (Fe 3 O 4 @ns-TiO 2 /Ag/g-C 3 N 4 ) composite photocatalysts with well-designed hierarchical yolk-shell structure. To endow the composites with fascinating features, multiple functional components are perfectly integrated into the definite structure. The photodegradation experiments of organic pollutants revealed a significant enhancement in photocatalytic activity of developed composites as compared to P25, which is mainly due to the synergetic interaction of the tailored three-dimensional (3D) yolk-shell porous nanostructure, extended sunlight response range, and retarded the recombination probability of photogenerated electrons-holes. More importantly, the hybrid samples exhibited superior magnetic properties due to the magnetic component. The excellent magnetic recyclability and reusability of the photocatalysts are verified by the magnetic hysteresis loop and cyclic photocatalytic degradation experiments, which is significant for the green and sustainable applications of photocatalysts. Considering its remarkable photocatalytic performance and expectant magnetic recyclability, the composite photocatalysts are expected to be a promising candidate to dispose of future environmental issues.
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ACS Applied Materials & Interfaces
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2021
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IF 9.229
Tongtong Wang,Xuedan Song,Hailong Xu,Miaomiao Chen,Jie Zhang,Min Ji
A recyclable and magnetic nanocomposite catalyst (IL/Fe3O4@HKUST-1) was synthesized via grafting ionic liquid (IL) [AEMIm]BF4 into magnetically functionalized metal–organic framework Fe3O4@HKUST-1 in a water–ethanol media. The properties of IL/Fe3O4@HKUST-1 were fully characterized by powder X-ray diffraction, electron microscopy, Fourier-transform infrared spectroscopy, nitrogen adsorption–desorption, density-functional theory, and a magnetic property measurement system. IL/Fe3O4@HKUST-1 showed high activity in the solvent-free cycloaddition of CO2 with epoxides under mild conditions. Furthermore, the catalyst can be easily separated from the reaction mixture, and the recycled catalyst maintained high performance for several cycles. The synergistic effect of the Lewis acid and base sites in IL/Fe3O4@HKUST-1 contributes to its greater reactivity than individual IL or HKUST-1.
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Journal of Materials Chemistry A
·
2020
·Vol. 9
·期 6
·3500-3510
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IF 11.301
Baiwen Deng,Zhicheng Liu,Fei Pan,Zhen Xiang,Xiang Zhang,Wei Lu
Electromagnetic pollution often interferes with the normal use of sophisticated electric devices leading to the necessity of developing electromagnetic wave absorbers with light weight and strong absorption ability. Herein, we synthesized two-dimensional magnetized MXene hybrids by electrostatic assembly of negatively charged few-layered Ti3C2Tx (MXene) with positively charged hollow Fe3O4 nanoparticles (HFO). The few-layered MXene was obtained by etching Ti3AlC2via a modified LiF–HCl method followed by a sonication process, while HFO was fabricated by a facile hydrothermal process. The MXene/HFO hybrids were light weight and achieved a high EM wave absorption performance (RLmin of −63.7 dB at a thin thickness of 1.56 mm). Moreover, the strong EM wave attenuation resulted from the synergistic effect arising from dielectric loss, magnetic loss, interface polarization and improved impedance matching. Therefore, the as-prepared magnetized MXene hybrids are expected to be candidates for high performance electromagnetic microwave absorbers.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Mengtian Jia,Yanyan Zhu,Dong Guo,Xiaogang Bi,Xiaohong Hou
Core-shell magnetic Fe 3 O 4 @MIL-101(Cr) nanoparticles were synthesized via layer-by-layer self-assembly method. Using Fe 3 O 4 @MIL-101(Cr) as support, Fe 3 O 4 @MIL-101(Cr)@MIP was prepared with phenytoin as template, acrylamide as functional monomer , ethylene glycol dimethacrylate as cross-linker, methanol and acetonitrile as porogen , azoisobutyronitrile as initiator. The materials were characterized by a serious of characterization experiments. The prepared Fe 3 O 4 @MIL-101(Cr)@MIP was demonstrated to possess good separability, large adsorption capability, excellent adsorption selectivity , good durability and reusability via adsorption experiments. Subsequently, a magnetic solid phase extraction method (MSPE) based on Fe 3 O 4 @MIL-101(Cr)@MIP combined with high performance liquid chromatography-ultraviolet detector (HPLC-UV) was established for the determination of phenytoin sodium in plasma samples. Experimental parameters including pH, the amount of adsorbent, extraction time, elution conditions, the concentration of NaCl were investigated to optimize extraction process. The method was validated. The linearity was observed in the range of 0.05–40 μg mL −1 with a lower limit of quantification of 0.05 μg mL −1 . The calibration equations were y = 0.2514x + 0.0319 ( r 2 = 0.9938), y = 0.2888x + 0.0472 ( r 2 = 0.9943), y = 0.2565x + 0.0418 ( r 2 = 0.9976), respectively. The recoveries ranged from 89.2 to 94.3%, intra- and inter-day precision (RSDs) ranged from 2.1 to 9.7% and 2.9–9.2%, respectively. The established MSPE-HPLC-UV method was time-saving, sensitive, accurate, environmental friendly, and drastically reduced the complex matrix interferences. The established method was successfully applied for phenytoin sodium determination in real plasma samples, providing new directions for therapeutic drug monitoring.
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TALANTA
·
2020
·
IF 5.339
Aiying Liu,Hua Zhang,Jianhua Ding,Wei Kou,Fei Yan,Keke Huang,Huanwen Chen
Quantitative detection of phospholipids at the single cell level remains in challenge. Herein, the TiO 2 -coated Fe 3 O 4 nanoparticles were synthesized to selectively enrich trace phospholipids from single cell, which were then eluted using 1.5% ammonia/methanol (w/w) for sensitive detection by electrospray ionization mass spectrometry . Under the optimal experimental conditions, eighteen phospholipids in single cell samples were detected and identified by MS/MS experiments. The limit-of-detections (LODs) were 0.012 μ g/L for phosphatidylcholine (PC, 34:1) and 0.014 μ g/L for phosphatidylcholine (PC, 36:2) in PBS matrix, with the linear range of 0.05–50 μ g/L ( R 2 ≥ 0.999). The recovery rates of 94.90–104.00% were obtained, with the relative standard deviations (RSDs ≤ 6.90%). Quantitative determination of PC in real unicellular samples was also achieved, with the concentration of 1.82–2.11 μ g/L for PC(34:1) and 1.25–1.65 μ g/L for PC(36:2) in six types of single cell, opening up possibilities for quantitative analysis of trace compounds in complex bio-samples. A set of 6 types of tumor cells were analyzed and further differentiated by the partial least squares-discriminant analysis (PLS-DA). Conclusively, a facile method for the direct quantification of phospholipids in single cell samples has been developed, showing potential applications for advanced investigation of phosphorylated substance at the single cell level.
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Journal of Cleaner Production
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2020
·
IF 7.246
Yanfei Li,Xinyan Zhang,Peizhen Zhang,Xian Liu,Lujia Han
This study enlightened a green and novel method to prepare magnetic bio-derived chars by physical co-mixing and the Pb 2+ adsorption behavior of these chars was investigated. Three kinds of magnetic chars were fabricated by wheat stalk biochar, rice husk biochar, and commercial coconut husk activated carbon co-mixing with magnetic nano-iron tetroxide (Fe 3 O 4 ), respectively. The microstructure, magnetism properties, adsorption performance, and mechanism of magnetic chars were systematically investigated with multiple approaches. The experimental results showed that optimized Fe 3 O 4 magnetic chars with the mass ratio of 1:3 (chars to Fe 3 O 4 ) exhibited excellent Pb 2+ adsorption ability and magnetic separation characteristics. The adsorption kinetics was well described by the pseudo-second order model indicating that the Pb 2+ adsorption rate and amount of magnetic chars were enhanced. The maximum Pb 2+ adsorption capacities of magnetic wheat stalk biochar, wheat stalk biochar, magnetic rice husk biochar, rice husk biochar, magnetic coconut husk activated carbon, and coconut husk activated carbon were 179.85, 160.39, 95.44, 73.34, 43.38, and 39.15 mg/g, respectively. Furthermore, the mechanism analysis indicated that the Pb 2+ adsorption on Fe 3 O 4 magnetic bio-derived chars included the co-precipitation reaction, complexation reaction, conjugation adsorption, ion exchange, and Fe–O coordination. This study presents an attractive method for preparing magnetic bio-derived chars for enhancing heavy metal adsorption without chemical processes and mechanical energy.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Jia-Jia Xu,Ya-Fei Cheng,Ren-Cun Jin
The performance of anaerobic ammonium oxidation (anammox) granules were studied under long-term exposure to Fe 3 O 4 NPs. The Fe 3 O 4 NPs had no negative impacts on nitrogen removal performance with the addition of 2−200 mg L −1 . The specific anammox activity (SAA) slightly decreased from 287.0 ± 13.2 to –253.0 ± 9.2 mg TN g -1 VSS d -1 with the increase in Fe 3 O 4 NPs level from 2 to 60 mg L -1 , and then significantly enhanced to 381.8 ± 15.7 mg TN g -1 VSS d -1 at 200 mg L -1 Fe 3 O 4 NPs. And the change trends of the heme c content, extracellular polymeric substance amount and settling velocity were consistent with that of SAA. The Candidatus_Kuenenia was the dominant species during the entire experiment and its relative abundance was up to 33.4 % at the end the experiment. The results provide some useful information for comprehending the impact of Fe 3 O 4 NPs on the performance of wastewater biological treatment systems.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Congming Sun,Weiru Dong,Junxiang Peng,Xiaoliang Wan,Zhenli Sun,Dehao Li,Suhua Wang
Increasingly serious uranium pollution necessitates a new method for rapid qualitative and quantitative uranium detection. Some methods based on fluorescence spectroscopy and surface-enhanced Raman scattering (SERS) have been reported to detect uranyl ions (UO 2 2+ ), the main species of uranium. However, various factors affect the fluorescence selectivity and SERS quantitative analysis. Herein we report on a composite material for a dual-mode fluorescence–SERS detection protocol for simultaneous quantitative and qualitative analysis of UO 2 2+ , based on a layer-by-layer assembly strategy, combining the advantages of the two complementary techniques. The composite material consists of a Fe 3 O 4 @SiO 2 core coated by gold nanoparticles (FA) via electrostatic adsorption. The CdTe quantum dots (CdTe QDs) outside the FA are linked with amide bonds to form a satellite Fe 3 O 4 -Au@CdTe nanostructure (FA-CdTe). The fluorescence signal of FA-CdTe was selectively quenched by UO 2 2+ , with a detection limit as low as 1.2 nM; the material was also used as a SERS substrate to detect the Raman mode of uranyl at 828 cm −1 . Furthermore, this method has been applied for UO 2 2+ detection in seawater, river water, and tap water, demonstrating the broad application prospects and providing novel development concepts.
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ChemPlusChem
·
2020
·Vol. 85
·期 8
·1783-1788
·
IF 2.753
Rongxiu Guo,GuangQi He,Lei Liu,Yongjian Ai,Ze-nan Hu,Xinyue Zhang,Haimeng Tian,Hong-bin Sun,Dun Niu,Qionglin Liang
Graphical Four in one : A quaternary-component catalyst containing platinum, copper, and iron, which are supported on Fe 3 O 4 nanospheres can be used in the selective synthesis of symmetrical secondary amines by transfer hydrogenation of nitriles with excellent conversion and selectivity. A variety of nitriles were tested for the synthesis of symmetrical secondary amines, and no hydrogenolysis byproducts were detected. Hydrogenation of nitriles is an efficient and environmentally friendly route to synthesize symmetrical secondary amines, but it usually produces a mixture of amines, imines, and hydrogenolysis by-products. Herein we report a magnetic quaternary-component Pt−CuFe/Fe 3 O 4 nanocatalyst system for the selective synthesis of symmetrical secondary amines with ammonia borane as hydrogen donor. The catalyst with a low Pt loading (0.456 wt%) is the source of the activity, and the d-band electron transfer from Cu to Fe enhances the selectivity. This synergistic effect results in the transformation of benzonitrile to dibenzylamine with excellent conversion (up to 99 %) and nearly quantitative selectivity (up to 96 %) under mild reaction conditions, nevertheless, the reaction TOF is as high as up to 1409.9 h −1 . A variety of nitriles are suitable for the synthesis of symmetrical secondary amines. More importantly, unwanted hydrogenolysis byproducts, especially toluene, is not detected at all. In addition, the catalyst is magnetically recoverable, and it can be reused up to five times.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiao Zhang,Bin Ren,Xi Li,Yanhua Xu,Biming Liu,Peng Yu,Yongjun Sun,Danhua Mei
In this study, graphitic carbon nitride (g-C 3 N 4 ) (CN) was conveniently and environmentally modified into a stable and easily recyclable photocatalyst for the high removal efficiency of dye contaminants in water. Magnetic carrier (CN/Fe 3 O 4 ) and heterojunction photocatalysts (Ag@AgBr/CN/Fe 3 O 4 ) were prepared by ultrasonic and in situ deposition of Fe 3 O 4 and Ag@AgBr nanoparticles on the CN , respectively, and characterized by the surface structure, optical, and electrochemical properties. The effects of different catalysts, silver loading, catalyst dosage, and different aeration conditions on the photocatalytic degradation of RhB were investigated. Results exhibited that the removal rate of RhB by Ag@AgBr/CN/Fe 3 O 4 reached 96% within 150 min when the Ag loading was 5%, the catalyst dosage was 0.4 g/L, and the aeration was air. Furthermore, the degradation rate constant was 17.3 × 10 −3 min −1 , which was 4.3 and 3.4 times higher than that of CN and CN/Fe 3 O 4 , respectively. The stability study demonstrated that Ag@AgBr/CN/Fe 3 O 4 had almost no risk of Ag and Fe leakage and showed high stability. Mechanism study indicated that the construction of Z-scheme heterojunction between Ag@AgBr and CN and trapping electron by Fe 3+ promoted charge transfer and electron–hole pair separation, thus enhancing photocatalytic activity.
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