ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Shaoming Fang,Xiaodong Dong,Shunli Liu,Donglai Penng,Linghao He,Minghua Wang,Guodong Fu,Xiaozhong Feng,Zhihong Zhang
In this paper, we report a novel label-free electrochemical aptasensor for detecting proteins in whole blood based on a three-component nanocomposite , in which ferriferrous oxide and three-dimensional graphene nanocomposite were modified with the plasma-polymerized 4-vinyl pyridine (Fe 3 O 4 @3D-rGO@PP4VP). In this novel sensing strategy, large amounts of amino groups in PP4VP facilitated the immobilization of aptamer strands via the strong electrostatic interaction between positively charged ammonium groups of the nanocomposites and negatively charged phosphate groups of aptamers. In the presence of thrombin, LYS (LYS), and platelet-derived growth factor-BB (PDGF-BB), the adsorbed aptamer strands on the developed nanocomposite surface caught the targeted proteins at the electrode interface. The aptamer preferred to be a barrier for electrons and inhibited electron transfer, leading to the decreased peak current of cyclic voltammetry measurements and the increased electron transfer resistance of electrochemical impedance spectroscopy . The determination of the thrombin, PDGF-BB, and LYS concentrations with this novel strategy showed low detection limits of 4.5, 29.4, and 14 pg·mL −1 , and the analytical ranges extend from 0.01 to 50, 0.1 to 100, and 0.1 to 200 ng·mL −1 , respectively. The resultant aptasensor exhibited high selectivity, acceptable reproducibility, and stability toward thrombin. The aptasensor could be used to detect thrombin in whole blood samples, thereby suggesting its possible application in clinical settings.
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RSC Advances
·
2016
·Vol. 6
·期 109
·107533-107541
·
IF 3.289
Xinliang Fang,Shanfeng Wang,Yanxiao Li,Xiaoyun Liu,Xinxin Li,Shaoliang Lin,Zhong-Kai Cui,Qixin Zhuang
Novel Fe3O4/polyimide (PI) composite films with extraordinary dielectric properties were prepared via in situ polymerization of PI in the presence of 4,4′-diaminodiphenyl ether (ODA), pyromellitic dianhydride (PMDA) and compatible amine-functionalized carbon-coated Fe3O4 nanoparticles (Fe3O4@C–NH2). Fe3O4 nanoparticles prepared via solvothermal reaction were coated with crosslinked glucose and then surface-grafted via carbodiimide coupling. The core–shell structure of Fe3O4@C–NH2 was thereafter obtained with amine functionalities on the carbonized-glucose shell. Homogeneous dispersion of Fe3O4@C–NH2 and strong interfacial covalent bonding on the shell surface contributed to high dielectric constants (ε) and extremely low dielectric losses (tan δ) in the composite films. The highest dielectric constant of the composite films was 58.6 at 1 kHz when the Fe3O4@C–NH2 composition was 1.13 vol%, as well as a low dielectric loss of 0.0091 and a high breakdown strength of 126.5 ± 11.3 MV m−1 were observed without considerable sacrifice of the thermal stability and mechanical properties.
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CHEMOSPHERE
·
2016
·
IF 3.698
Guoqiang Gan,Juan Liu,Zhixi Zhu,Ziran Yang,Conglu Zhang,Xiaohong Hou
In this work, magnetic nanoparticles (MNPs) Fe 3 O 4 /CeO 2 were firstly synthesized using three different preparation methods, including coprecipitation, impregnation oxidation-precipitation and impregnation reduction-precipitation, respectively. The catalytic activities of Fe 3 O 4 /CeO 2 MNPs, prepared by above three methods, were compared systematically in terms of the degradation of orange G (OG). The impregnation oxidation-precipitation process was economical and maneuverable due to the usage of air, no need of nitrogen protection and higher utilization efficiency of iron. Response surface methodology based on central composite design were used to investigate the individual and interactive effects of three process parameters on the OG degradation, i.e. the initial pH of the solution, the dosage of H 2 O 2 and the initial concentration of OG. Under the optimal conditions of pH 2.5, H 2 O 2 30 mM, OG 50 mg L −1 , catalyst 2.0 g L −1 and 35 °C, the degradation percentage of OG was 98.2% within 120 min, which agreed well with the modeling prediction (R 2 = 0.9984, and Adj-R 2 = 0.9969). And the degradation reaction well followed the first-order kinetic with R 2 = 0.9969. The Fe 3 O 4 /CeO 2 -OX MNPs showed high catalytic activity, stability and reusability in the degradation of OG.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Tianqi Liu,Hailian Huang,Yunzong Liu,Konstantinos Papadikis,Beata Layla Mehdi,Pow-Seng Yap,Graham Dawson
A novel magnetic quinary nanocomposite, protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI, was synthesized using a wet chemical method. The multi-heterojunction photocatalyst with multi carrier source and multi-channel carrier transport is constructed to enhance the photocatalytic degradation performance of pure g-C 3 N 4 . The design of the quinary nanocomposite is also an effective approach solving the chemical stability problem of silver halides. The photocatalytic degradation efficiency under visible light irradiation was analyzed for methylene blue (MB) as the target organic pollutant. The quinary nanocomposite with 10 % g-C 3 N 4 displayed high photocatalytic performance, with 83 % of MB degraded under 6 h LED white light irradiation. The effective quinary nanocomposite has good magnetic properties and can be magnetically separated to prevent secondary pollution of the photocatalyst in water. The band gap of protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI was found to be lower than pure g-C 3 N 4 . Parameters such as initial concentration of pollutant, initial solution pH, and light source were studied. Zeta potential results showed that the quinary nanocomposite could disperse homogenously to decrease aggregation in the solution. The photocatalytic mechanism was investigated, and the mineralization results were analyzed based on liquid chromatography-mass spectroscopy (LC-MS) and total organic carbon (TOC). It was found that the hydroxyl and superoxide radicals were major reactive species by scavenging experiments. Additionally, protonated g-C 3 N 4 /Fe 3 O 4 /AgBr/AgCl/AgI nanocomposite showed excellent reusability after magnetic separation and regeneration, thus suggesting it to be a promising photocatalyst for treating wastewater containing organic contaminants.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pei Su,Xuedong Du,Yang Zheng,Wenyang Fu,Qizhan Zhang,Minghua Zhou
A bifunctional catalyst with Ce-based metal–organic frameworks deposited on carbon encapsulated Fe 3 O 4 particles (Ce-MOFs/Fe 3 O 4 @C) was prepared for heterogeneous electro-Fenton (EF), which exhibited high H 2 O 2 generation efficiency (over 90% selectivity and 80.7% current efficiency), high sulfamethazine (SMT) removal with very low electric energy consumption (7.65 kWh kg −1 SMT), and wider pH suitability to alkaline environment (pH 9). The highest content of oxygen vacancies (O V ), Ce 3+ and Fe 2+ was simultaneously exhibited when the Fe/Ce ratio in precursor was 2:1. Interface-confined between Ce-MOFs and Fe 3 O 4 @C and presence of O V promoted the O 2 adsorption for oxygen reduction reaction and O 2 ∙- generation, and electron transfer between Fe and Ce. Meanwhile, the presence of Fe 2+ /Fe 3+ and Ce 3+ /Ce 4+ simultaneously facilitated the sequential catalysis induced by H 2 O 2 to generate ∙ OH, and Ce 4+ could promote O 2 ∙- to generate 1 O 2 . This work provides new insight into the design and synthesis of Fe-based catalysts in EF with interface confinement and multi-layered reaction centers to improve the generation and the decomposition of H 2 O 2 at the same time at a low cathode potential.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Mengying Liu,Jia Gao,Huixiao Yang,Yidi Zhang,Xinzhu Huang,Kaoqi Lian,Li Ma
Perfluorinated compounds (PFCs) are a class of widely distributed persistent organic pollutants (POPs), attracting increased attention. Consequently, there is an urgent demand for sensitive, reliable, and high-throughput methods to detect PFCs. This study used a monomer-mediated in situ growth strategy to design and synthesize Fe 3 O 4 @TFA–TAPA–COF. Accordingly, a novel method based on Fe 3 O 4 @TFA–TAPA magnetic solid-phase extraction combined with ultra-high-performance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) was developed to detect 22 ultra trace PFCs from water and honey samples. Several techniques used to characterize Fe 3 O 4 @TFA–TAPA–COF showed that it had a porous structure with a large surface area (102.84 m²/g). Under optimized parameters, the ranges for the limit of detection (LOD) in water and honey were 0.42–23.44 pg/L and 3.36–187.52 pg/kg, respectively. The results indicated that Fe 3 O 4 @TFA–TAPA–COF had high selectivity, high adsorption ability, and reusability. Additionally, the proposed method exhibited good accuracy, low LOD, and good reproducibility. This method was successfully applied to determine PFCs in 54 tap water and 40 honey samples in Shijiazhuang, China, and provided methodological reference and technical support for the risk monitoring of food quality and safety.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jing Huang,Li Wang
This study demonstrates a green and sustainable strategy for efficient single-step recovery of cerium through the rational design of core–shell Fe 3 O 4 @ZIF-8 nanocomposites. The material is comprehensively characterized in terms of morphology, magnetic properties, functional groups, and pore structure. Adsorption studies reveal pH-dependent recovery behavior, with optimal performance in the pH range of 3.9–7.2. Analysis of isotherms and thermodynamics confirms the endothermic nature of the recovery process, showing a monotonic increase in the maximum adsorption capacity from 110 mg g −1 to 185 mg g −1 as temperature rises from 283 K to 328 K. Notably, the effect of ionic strength (IS) suggests that NaCl significantly enhances Ce(III) recovery efficiency, while K 2 SO 4 exhibits marked suppression. Competitive adsorption experiments reveal stronger interference from heavy REEs (Ho 3+ /Tm 3+ ) compared to light REEs (La 3+ ). The fundamental mechanisms are elucidated through multiscale interaction analysis, revealing a synergistic process combining dual-phase transition dynamics and photoinduced redox reactions. The surface architecture of magnetic core evolves from initial ZnO-dominant nanocrystals to ZnO/CeO 2 heterostructures, and ultimately stabilizes as a CeO 2 -enriched framework with increasing Ce(III) concentrations. Moreover, across the time scale, the speciation of surface-adsorbed cerium underwent a gradual transition from Ce(III)-dominance to Ce(IV)-dominance, ultimately forming a regime where Ce(IV) (CeO 2 ) served as the primary species. This progressive transformation enables in situ immobilization and single-step recovery of Ce(III) under mild conditions, establishing a novel paradigm for REEs recovery technology.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yukai Huang,Haoyang Zhong,Tong Zou,Bin Zhang,Linlin Yu,Wenyu Wang,Shijie Zhang,Ruoyu Chen,Qian Jia
In this work, a superhydrophobic magnetic photothermal flame-retardant polyurethane sponge (AH/Fe-MOF-P@Fe 3 O 4 @PA@PU) with efficient oil–water separation performance was prepared. After coating the polyurethane sponge with a phytic acid (PA) film, the new honeycomb-like “three-in-one” flame-retardant AH/Fe-MOF-P and magnetic nanoparticle Fe 3 O 4 were firmly bound to the sponge by polydimethylsiloxane (PDMS). AH/Fe-MOF-P@Fe 3 O 4 @PA@PU exhibited excellent superhydrophobicity (with a water contact angle of 155.3°), an oil–water separation efficiency of up to 99%, outstanding recyclability, and environmental stability. Utilizing its magnetic properties, it can be applied to special and complex oil spill treatments. The AH/Fe-MOF-P@Fe 3 O 4 @PA@PU composite exhibited exceptional photothermal properties and demonstrated highly efficient adsorption capabilities for high-viscosity crude oil. Furthermore, the modified sponge possessed remarkable flame-retardant properties, exhibiting the ability to self-extinguish within 2 s following ignition. The superhydrophobic magnetic flame-retardant polyurethane sponge has great potential as an effective oil spill remediation material.
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JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·
IF 1.992
Jin Xu,Xuejia Shi,Xiaomeng Zhang,Zhenzhong Wang,Wei Xiao,Linguo Zhao
To efficiently recycle GH78 thermostable rhamnosidase (TpeRha) and easily separate it from the reaction mixture and furtherly improve the enzyme properties, the magnetic particle Fe 3 O 4 -SiO 2 -NH 2 -Cellu-ZIF8 (FSNcZ8) was prepared by modifying Fe 3 O 4 -NH 2 with tetraethyl silicate (TEOS), microcrystalline cellulose and zinc nitrate hexahydrate. FSNcZ8 displayed better magnetic stability and higher-temperature stability than unmodified Fe 3 O 4 -NH 2 (FN), and it was used to adsorb and immobilize TpeRha from Thermotoga petrophilea 13995. As for properties, FSNcZ8-TpeRha showed optimal reaction temperature and pH of 90°C and 5.0, while its highest activity approached 714 U/g. In addition, FSNcZ8-TpeRha had better higher-temperature stability than FN. After incubation at 80°C for 3 h, the residual enzyme activities of FSNcZ8-TpeRha, FN-TpeRha and free enzyme were 93.5%, 63.32%, and 62.77%, respectively. The organic solvent tolerance and the monosaccharides tolerance of FSNcZ8-TpeRha, compared with free TpeRha, were greatly improved. Using naringin (1 mmol/l) as the substrate, the optimal conversion conditions were as follows: FSNcZ8-TpeRha concentration was 6 U/ml; induction temperature was 80°C; the pH was 5.5; induction time was 30 min, and the yield of products was the same as free enzyme. After repeating the reaction 10 times, the conversion of naringin remained above 80%, showing great improvement of the catalytic efficiency and repeated utilization of the immobilized α-L-rhamnosidase.
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JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2020
·Vol. 58
·期 7
·678-685
·
IF 1.28
Zhang Hui-Xian,Zhang Ping,Fu Xiao-Fang,Zhou You-Xiang,Peng Xi-Tian
This paper reports a simple, sensitive and reliable method for the simultaneous detection of aflatoxin B1, B2, G1 and G2 in vegetable oils. Aflatoxins were extracted by magnetic solid phase extraction followed by high-performance liquid chromatography, then postcolumn photochemical derivatization and finally detected by fluorescence detector. Vegetable oil samples were first diluted with hexane and then commercial bare Fe3O4 nanoparticles were directly employed as sorbents to extract aflatoxins from complex vegetable oil samples, which significantly simplified the procedure of sample preparation and largely improved the sample analysis throughput. The effects of various parameters such as the amount of sorbent, loading, washing and eluting conditions were carefully optimized to improve the extraction efficiencies of aflatoxins. Under the optimal conditions, the limits of detection of four aflatoxins ranged from 0.01 μg/kg to 0.16 μg/kg, and squared regression coefficients (R2) >0.9990 were obtained within the linear range of 0.1–20 μg/kg (except for aflatoxin G2 with 0.5–20 μg/kg). Furthermore, the recoveries spiked at four concentration levels in a blank vegetable oil sample were from 82.6 to 106.2%, with inter- and intraday relative standard deviations <9.8%, indicating good accuracy and precision of the proposed method.
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FOOD CONTROL
·
2022
·
IF 6.652
Dakai Guo,Qingwen Huang,Rui Zhao,Wenbo Guo,Kai Fan,Zheng Han,Zhihui Zhao,Dongxia Nie
An efficient and fast magnetic solid phase extraction (MSPE) method was developed using MIL-101(Cr)@Fe 3 O 4 nanocomposites as adsorbent for purification and enrichment of 9 mycotoxins in agricultural products. The successful synthesis of MIL-101(Cr)@Fe 3 O 4 was confirmed via various characterization methods. Several key parameters affecting the performance of the MSPE procedure were extensively investigated including loading solution, elution solution and dosage of adsorbents. Under the optimal sample pretreatment conditions, the complex matrix effects from different agricultural products could be efficiently eliminated and the calibration curves constructed in neat solvent were directly used for the accurate quantification of these mycotoxins. Coupled with the analysis by ultra-high-performance liquid chromatography-tandem mass spectrometry, good linearity (R 2 ≥ 0.991), high sensitivity (limit of quantification in the range of 0.08–0.20 μg kg −1 ), satisfactory recovery (83.5–108.5%) and acceptable precision (RSD, 1.6–10.4%) were obtained. The applicability of the validated method was further verified in real maize, wheat, watermelon and melon samples.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Fan Wang,Yueying Zheng,Xinggang Wei,Dawei Lan,Jintao Zhu,Yingjie Chen,Ziquan Wo,Tao Wu
This study designed a composite material with internal synergistic effects among multiple components to achieve highly selective adsorption of Cu (II). Through controlled synthesis, the Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 composite was successfully fabricated, leading to significant improvement in adsorption selectivity , capacity, and adsorption rate. The experimental results showed that the composite is of outstanding selectivity in the adsorption of Cu (II), with a partition coefficient K of Cu (II) that was 2.2–5.3 times higher than that of other coexisting ions. Moreover, the composite exhibited a remarkable adsorption capacity of 1261.0 mg g −1 and a fast adsorption rate of 840.7 mg g −1 h −1 at 298 K. Additionally, its magnetic property facilitated easy separation from wastewater, thereby enhancing its potential for commercial applications. The synergetic effect mechanism was analyzed through characterizations and DFT calculations. Furthermore, the recyclability of the composite was investigated, which showed that after seven cycles, the adsorption efficiency remained at 85% of its initial efficiency. It can be concluded that Fe 3 O 4 /MnO 2 (3 1 0)/ZIF-67 has potential to address challenges posed by heavy metal pollution in copperplating effluents.
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