Analytical Methods
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2013
·Vol. 5
·期 16
·3984-3991
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IF 1.855
Miaomiao Tian,Wei Feng,Juanjuan Ye,Qiong Jia
We reported new magnetic microspheres as the adsorbent of estrogens. They were prepared by coating Fe3O4 particles with a composite made from titanium dioxide and graphene oxide (Fe3O4@TiO2/GO). The beads were loaded into a microfluidic chip and used to adsorb estrone (E1), estradiol (E2), and estriol (E3). The estrogens were then eluted from the beads with methanol and submitted to high performance liquid chromatography (HPLC) determination. Effects of sample volume, sample flow rate, sample pH value, and eluent flow rate were optimized. The limits of detection for estrogens were in the range of 4.3–7.5 ng mL−1, and recoveries ranged from 70.6% to 94.5%. Intra-day and inter-day relative standard deviations were less than 2.5% and 3.2%, respectively. The results indicated that the method was successfully applied to the determination of estrogens in milk and milk powder samples.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wenhe Xie,Suyuan Li,Suiyan Wang,Song Xue,Zhengjiao Liu,Xinyu Jiang,Deyan He
N-doped amorphous carbon coated Fe3O4/SnO2 coaxial nanofibers were prepared via a facile approach. The core composite nanofibers were first made by electrospinning technology, then the shells were conformally coated using the chemical bath deposition and subsequent carbonization with polydopamine as a carbon source. When applied as a binder-free self-supported anode for lithium ion batteries, the coaxial nanofibers displayed an enhanced electrochemical storage capacity and excellent rate performance. The morphology of the interwoven nanofibers was maintained even after the rate cycle test. The superior electrochemical performance originates in the structural stability of the N-doped amorphous carbon shells formed by carbonizing polydopamine.
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RSC Advances
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2017
·Vol. 7
·期 39
·24453-24461
·
IF 3.108
Chaocheng Zhao,Pei Dong,Zongmei Liu,Guangrui Wu,Shuaijun Wang,Yongqiang Wang,Fang Liu
An active Fe3O4/MIL-101 hybrid material was prepared via a simple in situ solvothermal method and characterized as a heterogeneous Fenton-like catalyst for Rhodamine B (RhB) degradation. The Fe3O4/MIL-101 exhibited enhanced catalytic performance for RhB degradation in a neutral solution. Under optimized conditions, almost 100% removal of 10 mg L−1 RhB was achieved in 30 min using 0.5 g L−1 Fe3O4/MIL-101 and 20 mM H2O2 at initial pH 7. The reusability of Fe3O4/MIL-101 was also investigated after four runs. On the basis of the characterization of the catalyst, the results of metal leaching, the effects of radical scavengers, and hydroxyl radical (˙OH) determination, it was concluded that RhB is decomposed mainly by the attack of the hydroxyl radical (˙OH), generated by the reaction of Fe2+ species with H2O2. MIL-101 showed a significant synergistic effect with Fe3O4, in which it played the role of a solid-acid catalyst with Lewis acid sites on its surface, ensuring that a Fenton-like reaction occurred in the neutral solution.
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WATER RESEARCH
·
2017
·
IF 6.942
Mingjie Huang,Tao Zhou,Xiaohui Wu,Juan Mao
This study demonstrated the efficient degradation of a typical bio-refractory antibiotic norfloxacin (NOR) in a photochemical iron oxides/oxalate system adopting magnetic catalyst (Fe 3 O 4 /UV/Ox). It was found that the in-situ generated HO was the main reactive oxygen species (ROS) but CO 2 – could also participate in the NOR degradation to form formylate organic intermediates. Besides, NOR would be degraded via an interesting pathway comprising an initial lag and a subsequent rapid period, where the former could be eliminated by introducing the pre-dissolution of Fe 3 O 4 particles. Furthermore, specific comparative investigations and surface characterizations of pre-adsorbed Fe 3 O 4 particles had evidenced that the existence of surface-bound iron-Ox complexes would be critical for the heterogeneous photochemical dissolution of Fe 3 O 4 and effectively initiated the subsequent homogeneous-heterogeneous NOR degradation. Finally, a comprehensive distinguishing reaction mechanism was proposed including a homogeneous-heterogeneous iron cycle on the solid-water interface and a series of homogeneous radical reactions. Therein, complexation instead of photochemical reduction would be dominant during the whole dissolution process even under UV irradiation. Rapid electrons exchange would occur photochemically between Fe II and Fe III in the octahedral sites, further weakening the surface Fe-O bonds and accelerating its breakaway from the bulk Fe 3 O 4 structure. This work could distinguish the complex heterogeneous/homogeneous reactions in the photochemical in-situ chemical oxidation systems that utilize naturally abundant iron oxides and polycarboxylic acids.
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Materials Chemistry Frontiers
·
2017
·Vol. 1
·期 6
·1185-1193
·
IF 0
Wei Huang,Xinxin Xiao,Christian Engelbrekt,Minwei Zhang,Shuo Li,Jens Ulstrup,Lijie Ci,Jinkui Feng,Pengchao Si,Qijin Chi
The discovery of new anode materials and engineering their fine structures are the core elements in the development of new-generation lithium ion batteries (LIBs). To this end, we herein report a novel nanostructured composite consisting of approximately 75% Fe3O4 nanorods and 25% reduced graphene oxide (rGO). Microscopy and spectroscopy analyses have identified that the Fe3O4 nanorods are wrapped (or encapsulated) by the rGO nanosheets via covalent bonding, which further self-assemble into a mesoporous hybrid composite networked by the graphene matrix. The composite has an average pore size around 20 nm and exhibits a high surface area of 152 m2 g−1, which is 76 times as high as that of conventional Fe3O4 powder. We have used the composite as an LIB anode material to fabricate coin-type prototype cells with lithium as the cathode. Systematic half-cell testing evaluations show that the electrochemical performance of the present composite material is amongst the best of the transition metal-oxide based LIB anode materials. The performances are characterized by a high reversible capacity of 1053 mA h g−1 subjected to 250 charge–discharge cycles at 500 mA g−1 and an excellent rate capability with the deliverable energy of 788–541 mA h g−1 upon the application of high current densities of 1000–5000 mA g−1. Overall, we have demonstrated that Fe3O4 nanorod–rGO hybrid composite is an interesting and promising material for the fabrication of LIB anodes.
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POLYMER COMPOSITES
·
2024
·
IF 4.8
Yingjun Li,Yingchun Lu,Yunpeng Li,Hanwen Duan,Chaoyi Zhu,Yuanlin Zhou
The strategic alignment of nanoplatelets within polymer matrices is pivotal for the development of nanocomposites with superior gas barrier characteristics. In this work, the effect of lamellar particles orientation in polymer for gas permeation was demonstrated. The magnetic α-Al 2 O 3 (Al 2 O 3 @PDA-Fe 3 O 4 ) was first prepared by in situ growth of Fe 3 O 4 nanoparticles immobilized on polydopamine (PDA)-modified Al 2 O 3 surface. Subsequently the orientation of magnetic α-Al 2 O 3 in brominated butyl rubber (BIIR) was achieved by modulating the applied magnetic field direction. Results show that the PDA, as the role of surface adhesive, not only anchored Al 2 O 3 substrate but also bound ferric ions for the further in situ formation of Fe 3 O 4 , which ensured the physico-chemical stability of the magnetic α-Al 2 O 3 . Comparison of hydrogen permeation performance of composites with in-plan, middle-of plane and out-of plane alignment demonstrated the effect of lamellar particles orientation. The Al 2 O 3 @PDA-Fe 3 O 4 /BIIR composite with in-plane alignment had the best hydrogen barrier property by a 50% reduction in hydrogen permeability coefficient compared to the neat BIIR, underscoring the critical role of particle orientation in enhancing the gas barrier properties of nanocomposites. Highlights The structural stability of magnetic Al 2 O 3 nanocomposites was enhanced by polydopamine (PDA). The composites with in-plane alignment, middle-of plane alignment and out-of plane alignment were prepared by a magnetic field. The effect of lamellar particles orientation on gas permeation of polymer nanocomposites was studied. The composites with in-plane alignment possesses the best gas barrier property.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xin Liang,Laishi Li,Yusheng Wu,Feng Liu,Yuzheng Wang
The efficiency of Fenton-like catalysts was critically affected by the rapid transfer of Fe 2+ /Fe 3+ , a process that was essential for the formation of active free radicals by H 2 O 2 . Herein, we synthesized CuS/Fe 3 O 4 @MIL-100(Fe) (CFM) ternary composites using hydrothermal and in-situ growth methods to enhance the degradation of oxytetracycline hydrochloride (OTC-HCl) in a Fenton-like photocatalytic system. The incorporation of CuS as a co-catalyst into the double iron-based system significantly enhanced photocatalytic activity, achieving a 95.31 % degradation efficiency for OTC-HCl within 50 min under optimized conditions. The catalyst had good reusability, has 86.64 % degradation efficiency after five magnetic recovery cycles, and still showed good catalytic performance in the presence of five different concentrations of common anions. Further analysis using active species quenching and electron paramagnetic resonance (EPR) experiments revealed the role of oxygen-containing radicals in the process. Liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) calculations provided OTC-HCl degradation pathways and intermediates. X-ray Photoelectron Spectroscopy (XPS) analysis indicated that CuS enhanced the performance of the bis-iron-based materials by improving the transfer efficiency of Fe 2+ /Fe 3+ and Cu + /Cu 2+ ions, which in turn accelerated the generation of reactive radicals from H 2 O 2 .
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CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Tao Li,Chen Gao,Tianlei Yang,Yueping Guan
The oilfield produced water (PW) treated by traditional process difficult to reduce the chemical oxygen demand COD value to below 50 mg/L. In this work, magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar was successfully prepared. The COD value of the PW was reduced from an initial value of 387 mg/L to 37 mg/L in 10 min of low speed mixing using magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar. In addition, the spent magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar can be regenerated by heating at 240 °C for 20 min. The regenerated magnetic nano-Fe 3 O 4 modified powdered coconut shell biochar showed excellent adsorption properties, and the COD value of the PW was reduced to about 35 mg/L in all six recycles.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Meimei Xu,Shuai Zhao,Chenglong Lin,Yanyan Li,Weida Zhang,Yusi Peng,Rui Xiao,Zhengren Huang,Yong Yang
Lateral flow immunoassay (LFIA) has been widely used for the early diagnosis of diseases. However, conventional colorimetric LFIA possesses limited sensitivity, and the single-mode readout signal is easily affected by the external environment, leading to insufficient accuracy. Herein, multifunctional Fe3O4@MoS2@Pt nanotags with a unique “pompon mum”-like structure were triumphantly prepared, exhibiting excellent peroxidase (POD)-like activity, photothermal properties, and magnetic separation capability. Furthermore, the Fe3O4@MoS2@Pt nanotags were used to establish dual-mode LFIA (dLFIA) for the first time, enabling the catalytic colorimetric and photothermal dual-mode detection of severe acute respiratory syndrome coronavirus 2 nucleocapsid protein (SARS-CoV-2 NP) and influenza A (H1N1). The calculated limits of detection (cLODs) of SARS-CoV-2 NP and H1N1 were 80 and 20 ng/mL in catalytic colorimetric mode and 10 and 8 ng/mL in photothermal mode, respectively, demonstrating about 100 times more sensitive than the commercial colloidal Au-LFIA strips (1 ng/mL for SARS-CoV-2 NP; 1 μg/mL for H1N1). The recovery rates of dLFIA in simulated nose swab samples were 95.2–103.8% with a coefficient of variance of 2.3–10.1%. These results indicated that the proposed dLFIA platform showed great potential for the rapid diagnosis of respiratory viruses.
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Analytical Methods
·
2024
·Vol. 17
·期 1
·84-91
·
IF 2.7
Miaowen Xu,Gaoyang Chen,Yong Huang,Hangyu Song,Zheng Wu,Fengjuan Jiang,Lei Fu,Caili Bi,Xiaowei Cao,Wei Wei
This paper presents functionalized magnetic nanoparticles (Fe3O4@Au MNPs) combined with the surface-enhanced Raman spectroscopy (SERS) technique for sensitive detection of colorectal cancer (CRC) protein biomarker carbohydrate antigen 19-9 (CA19-9). Fe3O4@Au MNPs were constructed by the PEI-mediated seed growth method. Then, the signal molecule 5-5′-dithiobis (succinimidyl-2-nitrobenzoic acid) was used as a bridging agent to link CA19-9 antibody, and the SERS sensor was prepared. Using this sensor, detection of CA19-9 can be realized with only a one step sampling reaction. Fe3O4@Au MNPs combine the advantages of magnetic materials and noble metal nanoparticles, effectively amplifying the signal by creating numerous “hot spots” within the Au particle gaps and enhancing magnetic enrichment. Consequently, this approach lowers the detection limit (LOD) and enhances detection sensitivity. The ratio of characteristic peak intensities I1392/I1069 was selected for calculation, and a linear equation was constructed with a LOD as low as 0.27 U mL−1 by quantitative detections of the standard antigen. Finally, the sensor was used to analyze the clinical serum samples from CRC patients and healthy individuals, and the detection results were consistent with the actual results. This method exhibits notable advantages, including simplicity, high sensitivity, specificity, stability and reproducibility. It is expected to provide a new promising analytical method for clinical CA19-9 immunoassay.
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JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Fan Bai,Xu Yang,Cheng Yang,Hai-Long Qian,Xiu-Ping Yan
The unintentional dissemination of uranium into environment poses substantial risks to both food sources and human populations. An advanced method for convenient and accurate detection of uranium in food is thus a pressing need. Herein, a novel magnetic amidoxime functionalized covalent organic framework (TpDb-AO@Fe 3 O 4 ), prepared with 2,5-dinitrobenzonitrile, 1,3,5-triformylphloroglucinol and hydroxylamine hydrochloride, was synthesized as adsorbent for magnetic-solid phase extraction (MSPE) of UO 2 2+ . Furthermore, a TpDb-AO@Fe 3 O 4 based MSPE coupled with UV–vis spectrophotometer was successfully developed to realize the determination of uranyl ions with low limit of detection of 1.63 μg L −1 , wide linear range of 10 − 200 μg L −1 . The spiking recoveries in real seafood samples (tuna, yesso scallop, kelp, eel, hairtail) ranged from 94.1 % − 106.8 %. The intraday ( n = 5) and interday ( n = 5) relative standard deviation (RSD) for determination of UO 2 2+ were 3.33 % and 6.23 %, respectively. This approach represents an advancement in the rapid extraction and sensitive quantification of trace uranium contaminants in food matrices, thereby contributing to enhanced environmental monitoring and public health safeguards.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Richard Ansah Herman,Zhan-Peng Zhang,Marriam Khurshid,Ellen Ayepa,Cheng-Hai Yan,Jacob Paarechuga Anankware,Jun Wang
The gut microbiota of the silkworm ( Bombyx mori ) is essential for metabolic processes, including digestion and immunity. Nonetheless, the role of specific gut fungi in optimizing nutrient recycling influenced by infiltrated biomaterials remains inadequately elucidated. This study investigates the potential mechanisms through which gut fungi affect the dynamics of nutrient absorption in silkworms. For this purpose, 5th instar silkworms were exposed to Fe 3 O 4 -urease nanoconjugates for 168 h following the utilization of high-throughput microbiome sequencing to identify shifts in principal fungal groups. The conditional fungi groups Mucoromycota and Basidiomycota significantly increased from 10.28 % to 47.16 % and 0.53 % to 2.63 % respectively ( p < 0.05), while Ascomycota decreased from 86.57 % to 52.29 %, having no negative impact on the growth and sustainability of the host insect. Functional analysis using FunGuild showed enriched trophic nodes including pathotrophs, saprotrophs and symbiotrophs while functions of DEGs demonstrated an increased metabolic capacity associated with iron and heme binding, and lipase activity. This reveals significant restructuring of the gut fungi microbiota with specific fungal taxa exhibiting enhanced abundance and diversity correlated with the presence of Fe 3 O 4 -urease nanoconjugates, serving as a potential for engineered nanomaterials to promote the sustainability and development of sericulture.
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