BIOCHEMICAL ENGINEERING JOURNAL
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2025
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IF 3.8
Sisi Li,Shuang Li,Xiang Li,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Junjing Hao
Humic acid (HA) is a naturally biomass, that is considered as an ideal adsorbent material due to the abundance of functional groups on its surface. For this purpose, the highly dispersible magnetic humic acid (Fe 3 O 4 @HA) has been prepared by one-step solvothermal method. The developed Fe 3 O 4 @HA not only has a strong separation, but also can simultaneously adsorb tetracycline antibiotics (tetracycline, chlortetracycline hydrochloride and doxycycline hydrochloride). Batch sorption experiments convinced that the maximum tetracycline antibiotics adsorption capacity of Fe 3 O 4 @HA is 45.58, 86.87, and 88.46 mg/g and the largest removal of 94.5 %, 96.3 %, and 97.4 %, fast equilibrium time of 60 min. Meanwhile, the adsorption process is agreement with pseudo-second-order adsorption kinetics and Langmuir adsorption isotherm model. Thermodynamic data indicate that this adsorption is endothermic and spontaneous. Moreover, the designed Fe 3 O 4 @HA with the characteristic of anti-interference capabilities, a variety of water-matrix suitability and maintaining at least 80 % tetracycline antibiotics removal after five adsorption cycles. Finally, the adsorption mechanisms are explored by XPS and FT-IR analysis, which show that mainly involve electrostatic adsorption; hydrogen bonding, π–π, oxygen-containing functional group interactions; and physical adsorption on the surface. In conclusion, Fe 3 O 4 @HA demonstrates considerable promise as an adsorbent for treating antibiotic-contaminated water.
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Nano Research
·
2018
·Vol. 11
·期 3
·1500-1519
·
IF 7.994
Qiao Mingtao,Lei Xingfeng,Ma Yong,Tian Lidong,He Xiaowei,Su Kehe,Zhang Qiuyu
Yolk–shell Fe 3 O 4 @N-doped carbon nanochains, intended for application as a novel microwave-absorption material, have been constructed by a three-step method. Magnetic-field-induced distillation-precipitation polymerization was used to synthesize nanochains with a one-dimensional (1D) structure. Then, a polypyrrole shell was uniformly applied to the surface of the nanochains through oxidant-directed vapor-phase polymerization, and finally the pyrolysis process was completed. The obtained products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and thermogravimetric analyses (TGA) to confirm the compositions. The morphology and microstructure were observed using an optical microscope, scanning electron microscope (SEM), and transmission electron microscope (TEM). The N 2 absorption–desorption isotherms indicate a Brunauer–Emmett–Teller (BET) specific surface area of 74 m 2 /g and a pore width of 5–30 nm. Investigations of the microwave absorption performance indicate that paraffin-based composites loaded with 20 wt.% yolk–shell Fe 3 O 4 @N-doped carbon nanochains possess a minimum reflection loss of −63.09 dB (11.91 GHz) and an effective absorption bandwidth of 5.34 GHz at a matching layer thickness of 3.1 mm. In addition, by tailoring the layer thicknesses, the effective absorption frequency bands can be made to cover most of the C, X, and Ku bands. By offering the advantages of stronger absorption, broad absorption bandwidth, low loading, thin layers, and intrinsic light weight, yolk–shell Fe 3 O 4 @N-doped carbon nanochains will be excellent candidates for practical application to microwave absorption. An analysis of the microwave absorption mechanism reveals that the excellent microwave absorption performance can be explained by the quarter-wavelength cancellation theory, good impedance matching, intense conductive loss, multiple reflections and scatterings, dielectric loss, magnetic loss, and microwave plasma loss.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Ruyi Li,Guiming Fu,Chengmei Liu,David Julian McClements,Yin Wan,Shaoman Wang,Ting Liu
The tannase (from Aspergillus niger ) was immobilised by glutaraldehyde conjugation to amino-functionalised chitosan-coated magnetic nanoparticles (Fe 3 O 4 -CS nanoparticles). Fourier-transform infrared spectroscopy and thermo-gravimetric analysis showed that chitosan was coated on the surface of magnetic nanoparticles. Transmission electron microscopy indicated that the synthesised nanoparticles (Fe 3 O 4 -CS) were almost spherical or ellipsoidal with an average diameter of 5.97 ± 1.25 nm. The stability and functionality of free and immobilised tannase were compared. Both forms of tannase exhibited the same optimal temperature of 30 °C, whereas the optimal pH value of immobilised tannase (pH 4.5) was lower than that of the free tannase (pH 5.5). The pH and thermal stabilities of immobilised tannase were significantly better than those of free tannase. Immobilised tannase retained over 50% of its initial activity after repeated utilisation for eight cycles. Furthermore, the immobilised tannase effectively improve the clarity and colour of black and green tea infusions. These results showed that amino-functionalised Fe 3 O 4 -CS nanoparticles are an efficient carrier for immobilising tannase, and immobilised tannase can be used in the clarification of tea infusion.
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PubMed
高影响因子
BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2018
·Vol. 41
·期 5
·739-748
·
IF 2.139
Jiaojiao Xia,Bin Zou,Gangbin Zhu,Ping Wei,Zhenjiang Liu
To promote the activity and stability of immobilized porcine pancreatic lipase (PPL), novel carrier was combined with special immobilization method. Enzymatic activity was enhanced after immobilized onto ionic liquid modified magnetic Fe 3 O 4 by electrostatic adsorption. Activity of immobilized enzyme (PPL-IM/BF 4 -Fe 3 O 4 @CA) reached 596 U/g PPL. Through the combination of electrostatic adsorption and embedding immobilization methods, we improve binding force between the carrier and enzyme, and further enhance the efficiency and stability of immobilized enzyme. The activity of PPL-IM/BF 4 -Fe 3 O 4 @CA after repeated third use was 78%. After storage at room temperature for 5 days, the residual activity was 89%. Enzymatic properties and catalytic kinetics of immobilized enzymes were studied, and the effect mechanism of ionic liquid modified Fe 3 O 4 on PPL was revealed. The effect of ionic liquid on the carrier structure was investigated by characterization of XRD, FT-IR, SEM and TG. The mechanism and enzymatic properties of immobilized PPL via electrostatic adsorption and embedding were analyzed. A novel and efficient immobilized PPL was developed.
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高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Shafaq Sahar,Akif Zeb,Yanan Liu,Naseeb Ullah,Anwu Xu
We prepared the Fe 3 O 4 /g-C 3 N 4 nanoparticles (NPs) through a simple electrostatic self-assembly method with a 3:97 weight ratio to investigate their Fenton , photo-Fenton and oxidative functionalities besides photocatalytic functionality. We observed an improvement of the Fenton and photo-Fenton activities of the Fe 3 O 4 /g-C 3 N 4 nanocomposites . This improvement was attributed to efficient charge transfer between Fe 3 O 4 and g-C 3 N 4 at the heterojunctions, inhibition of electron-hole recombination, a high surface area, and stabilization of Fe 3 O 4 against leaching by the hydrophobic g-C 3 N 4 . The obtained NPs showed a higher degradation potential for rhodamine B (RhB) dye than those of Fe 3 O 4 and g-C 3 N 4 . As compared to photocatalysis , the efficiency of RhB degradation in the Fenton and photo-Fenton reactions was increased by 20% and 90%, respectively. Additionally, the horseradish peroxidase (HRP) activity of the prepared nanomaterials was studied with 3,3,5,5-tetramethylbenzidinedihydrochloride (TMB) as a substrate. Dopamine oxidation was also examined. Results indicate that Fe 3 O 4 /g–C 3 N 4 nanocomposites offers more efficient degradation of RhB dye in a photo-Fenton system compared with regular photocatalytic degradation, which requires a long time. Our study also confirmed that Fe 3 O 4 /g-C 3 N 4 nanocomposites can be used as a potential material for mimicking HRP owing to its high affinity for TMB. These findings suggest good potential for applications in biosensing and as a catalyst in oxidation reactions.
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Nanoscale
·
2024
·Vol. 16
·期 29
·13938-13944
·
IF 5.8
Dan Xie,Youyou Deng,Xunlong Ji,Yiyan Zhang,Wentao Zhang,Zijin Hong,Wenjing Liu,Jingjing Du,Zhenli Sun
A novel breakthrough has been achieved in gas detection through the innovative application of surface-enhanced Raman scattering (SERS) to hydrogen (H2) detection for the first time. This study capitalizes on the unique SERS effects of gold nanoparticles coupled with the redox interaction between hydrogen and crystal violet, allowing for the development of a magnetic SERS probe that demonstrated enhanced sensitivity and specificity. This new probe can detect hydrogen concentrations as low as 1% by volume in gaseous environments, offering a substantial improvement over the detection limits of traditional hydrogen alarms. Further, this report comprehensively detailed the synthesis of the FA-CV materials, instrumental analysis, and an in-depth evaluation of the SERS performance of the FA-CV substrate, underlining the outstanding sensitivity, stability, and recyclability of the probe. The introduction of SERS in this novel capacity not only contributes a valuable approach to gas sensing technologies, but also suggests promising avenues for the application of SERS in environmental monitoring and energy security. This illustrates the adaptability and potential impact of this powerful technique.
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高影响因子
FUEL
·
2024
·
IF 6.7
Sitong Liu,Shengli Niu,Hewei Yu,Kuihua Han,Sunwen Xia,Zihao Yang,Yue Zheng,Yujiao Zhang,Yanan Hao,Abulikemu Abulizi
The current transesterification for biodiesel is normally conducted with heat input and the resource is required to remove the contained water, which is complicated and costly. The novel magnetic catalyst of the bimetallic oxides of CeO 2 and Fe 3 O 4 supported on the hierarchical pore ZSM-5 was prepared and used for the biodiesel production through transesterification of palm oil with methanol under the electrolytic assistance. The prepared catalysts were characterized by SEM-EDS, TEM, FTIR, XRD, CO 2 /NH 3 -TPD, N 2 adsorption–desorption and VSM, etc. The loaded cerium stimulated the particles growth and abundant catalytic active sites were obtained due to the coral-like structure and they were beneficial for transesterification. The presence of both acidic and basic sites guaranteed the strong catalytic capability of the CeO 2 /ZSM-5@Fe 3 O 4 catalyst. Under the optimized transesterification condition of the catalyst dosage of 3 wt%, methanol to oil molar ratio of 18:1, reaction time of 2.5 h, electrolysis voltage of 40 V, presence of 2 % wt/wt of water added and reaction temperature of 25 ℃, the FAME yield of approximately 95 % was achieved. Also, the catalyst showed an acceptable reusability, where the FAME yield of 79 % was obtained after fourth reused cycle. In conclusion, the water in the resource promotes the electrolytic transesterification to occur efficiently at the room temperature.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Lingwei Li,Huan Wang,Jixiang Fang
Magnetic fluorescent composite nanomaterials have broad application prospects in the fields of biological imaging, anticounterfeiting identification, suspicious object tracking, and identification of latent fingerprints in forensic medicine. For an effective taggant, a clearly visible identifying mark is necessary to enable observers to capture labeling information quickly and accurately, even from a distance. The preparation method of magnetic fluorescent composite materials is complicated and usually needs different surface modification and assembly processes. The limited loading capacity of fluorescent materials also limits the fluorescence properties of the composite, so it is difficult to produce obvious fluorescence as a taggant to meet the requirements of visible labeling. In this study, a core–shell structure of a magnetic fluorescent composite was prepared by using the metal–organic framework ZIF-8 as the host of fluorescent materials and an encapsulation shell coated on the Fe3O4 nanoparticles. The porous ZIF-8 is beneficial for increasing the loading capacity of fluorescent materials to ensure the fluorescence performance of the composite materials. Further modification of the composite surface prevented the desorption of fluorescent materials from the pores of ZIF-8, enabling the samples to maintain good fluorescence properties even after multiple washing cycles. The preparation method is simple, rapid, and cost-effective, and the prepared magnetic fluorescent composite nanomaterial has high magnetic separation performance and fluorescence performance, making it a promising material for identification, marking, and tracking.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Ruixiong Huang,Zhanqiang Fang,Xiaomin Yan,Wen Cheng
In this study, the Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized as heterogeneous catalysts to effectively degrade bisphenol A (BPA). The properties of the synthesized catalysts were characterized by Brunnaer–Emmett–Teller (BET), X-ray powder diffraction (XRD), X-ray photoelectron spectrometry (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The results indicated that the Fe 3 O 4 MNPs appeared to be roughly spherical shapes and their average size was 10–20 nm. The catalytic capacity of MNPs in US + Fe 3 O 4 + H 2 O 2 system with different pH conditions, H 2 O 2 concentrations and MNPs doses was investigated. It was found that the OH radicals were promptly generated due to the catalysis of the Fe 3 O 4 MNPs. BPA could be degraded within a wide pH range from 3 to 9, and the degradation efficiencies were remarkably enhanced by ultrasound. The apparent rate constants were 8.31 × 10 −3 , 7.96 × 10 −3 and 5.64 × 10 −3 min −1 , respectively, when the pH values were 3, 7 and 9, respectively. The removal efficiencies of BPA were all over 95%. About half total organic carbon (TOC) in solution was eliminated under neutral condition by sono-Fenton process. Furthermore, the results of stability and reusability demonstrated that the Fe 3 O 4 MNPS were promising in the treatment of wastewater with refractory organics.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Yifu Jiang,Le Lang,Jingwen Zhang,Yining Ji,Chenglong Zhang,Ruiqin Yang,Xuwen Li
This study combined the structural characteristics of amanita peptide toxins to prepare a Fe 3 O 4 /P4VPBA/PPy/GO composite material as a magnetic solid-phase extraction adsorbent. The experimental results indicated that this adsorbent showed excellent selectivity for the extraction of amatoxins and phallotoxins from mushroom samples. Compared with traditional dispersive solid-phase extraction, this adsorbent enables rapid separation in the enrichment and elution recovery stages through the application of a magnetic field . Simultaneously, the study optimized the conditions for ultraperformance liquid chromatography–mass spectrometry (UPLC–MS/MS), ensuring both separation efficiency and accuracy while reducing the analysis time. The researchers established the MSPE–UPLC–MS/MS method for the determination of amanita peptide toxins in wild mushrooms. This method not only simplified and expedited the sample pretreatment process but also achieved qualitative and quantitative analyses in a short period, thus demonstrating high detection sensitivity and outstanding recovery rates. Furthermore, the developed method was successfully applied to analyze toxic mushrooms discovered in Nanjing, China. The potential for extensive utilization of this method is highlighted in the field of food analysis and detection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yiping Tang,Huanle Zhang,Jiquan Li,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Qingliu Wu
A novel three-dimensional ordered macroporous (3DOM) Cu/Fe 3 O 4 composite film was prepared by electrodepositing ferroferric oxide (Fe 3 O 4 ) on the 3DOM Cu current collector. Characterizations via electron microscopies and X-ray diffractions confirmed that achieved 3DOM Cu/Fe 3 O 4 composite inherited originally ordered porous structure, but has a layer of nanosized Fe 3 O 4 on the surface of the 3DOM Cu framework. The obtained 3DOM Cu/Fe 3 O 4 composite films were directly used as anodes of lithium ion batteries in the absence of conducting additives or binders. Results from electrochemical evaluations exhibited that the 3DOM Cu/Fe 3 O 4 anode could deliver a stable capacity of 800 mAh g −1 up to 400 cycles, while fast capacity degradation with 200 mAh g −1 retained after 100 cycles was observed on Fe 3 O 4 deposited on plane Cu substrate. The superior behavior of the 3DOM Cu/Fe 3 O 4 composite anode is ascribed to its unique porous structure, which provides sufficient space for large volume change of Fe 3 O 4 and greatly reduces the diffusion distance for Li-ion in the active material.
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POWDER TECHNOLOGY
·
2024
·
IF 4.5
Mingci Hu,Shan Qing,Xiaohui Zhang,Hao Zhang,Zichang Shi
Instability is a key issue that limits the application of magnetic nanofluids. In this study, Fe 3 O 4 @C nanoparticles were obtained using a carbon layer coated with a ferromagnetic material, which improved the instability of the magnetic nanofluid while obtaining higher thermal conductivity and showed excellent photothermal conversion performance in photothermal conversion experiments. Firstly, we prepared Fe 3 O 4 @C nanoparticles via the solvothermal method. We then compared different sizes of Fe 3 O 4 @C nanoparticles in terms of structure, composition, heat transfer characteristics and photothermal efficiency. The results indicate that contrary to the conventional belief that smaller nanoparticles have higher thermal conductivity, the 90.30 nm Fe 3 O 4 @C nanofluids has better thermal conductivity than 58.17 nm due to its larger proportion of carbon shells. In the photothermal conversion experiment for DASCs, the 58.17 nm group performed best, with the temperature of the 0.2 wt% sample reaching 45.80 °C and a photothermal efficiency of 60.32%.
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