COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xinchen Chen,Hongtao Xia,Jianqi Lv,Yuting Liu,Yang Li,Lejin Xu,Chuting Xie,Yun Wang
Reasonable surface modification and increasing structural porosity were two key factors to improve the adsorption performance of biochar in the adsorption field. In this study, three different proportions of bamboo-based magnetic biochar modified with Fe 3 O 4 (Fe 3 O 4 @MBC) were synthesized by “one-can” method. BET showed that this method could effectively increase the specific surface area (129.79 m 2 g −1 ) and VSM indicated Fe 3 O 4 @MBC had an excellent magnetic response (32.84 emu g −1 ), which was conducive to the separation after adsorption. The accurate matching of pseudo-second-order kinetic model, thermodynamic model and Langmuir isotherm showed that at 298 K, pH = 4.5, the adsorption process dominated by chemical complexation and monolayer adsorption was spontaneous, endothermic and disordered. Saturated adsorption capacity of Fe 3 O 4 @MBC with the more Fe 3 O 4 loading proportion could reach 70.45 mg g −1 within 12 h. The loading of Fe 3 O 4 by “one-can” method not only provided abundant Fe-O groups to assist adsorption, but also magnetized bamboo matrix. Results showed that adsorption mechanism of U(VI) by Fe 3 O 4 @MBC included electrostatic action and chemical complexation involving Fe-O, carbonyl group and ample oxygen-containing functional groups. Therefore, Fe 3 O 4 @MBC with easy separation, excellent regeneration, remarkable economic potential and green value provided a novel solution for the field of radioactive wastewater treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Mengyang Xing,Yong Chen,Wanqin Dai,Xiao He,Boqiang Li,Shiping Tian
Patulin is one of the most important mycotoxins that contaminates fruit-derived products and causes acute or chronic toxicity in humans. In the present study, a novel patulin-degrading enzyme preparation was developed by taking a short-chain dehydrogenase/reductase and covalently linking it to dopamine/polyethyleneimine co-deposited magnetic Fe 3 O 4 particles. Optimum immobilization provided 63% immobilization efficiency and 62% activity recovery. Moreover, the immobilization protocol substantially improved thermal and storage stabilities, proteolysis resistance, and reusability. Using reduced nicotinamide adenine dinucleotide phosphate as a cofactor, the immobilized enzyme exhibited a detoxification rate of 100% in phosphate-buffered saline and a detoxification rate of more than 80% in apple juice. The immobilized enzyme did not cause adverse effects on juice quality and could be magnetically separated quickly after detoxification to ensure convenient recycling. Moreover, it did not exhibit cytotoxicity against a human gastric mucosal epithelial cell line at a concentration of 100 mg/L. Consequently, the immobilized enzyme as a biocatalyst had the characteristics of high efficiency, stability, safety, and easy separation, establishing the first step in building a bio-detoxification system to control patulin contamination in juice and beverage products.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Zhimin Kou,Yun Hu,Yufeng Ma,Liang Yuan,Lihong Hu,Yonghong Zhou,Puyou Jia
Polymers with repairability driven by multiple stimuli and its functional composite materials are desired for practical applications. However, to date, study on dynamically crosslinked networks with multi-stimuli response or multichannel self-healing ability derived from green, renewable precursors has been rarely reported. Herein, bio-based dynamically crosslinked network based on Schiff base (dynamic imine bonds) and multiple hydrogen bonds were fabricated from soybean oil and vanillin. The reprocessing and self-healing properties could be customized by varying the ratio of methacrylation of the obtained fatty amide (MASO) UV-curable prepolymer and methacrylate functionalized vanillin (MAV). The introduction of Schiff base and hydrogen bonds endowed reprocessability for the material. Moreover, the resulting bio-based dynamically crosslinked network exhibited outstanding self-healing performance stimulated by heat, organic solvent, infrared radiation, and microwave. The bio-based composites with Fe 3 O 4 nanoparticles were also investigated to realize non-contact welding of fracture. This study provided a promising strategy for the development of biomass resources and bio-based dynamically crosslinked network composites with good repairability.
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Catalysts
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2023
·Vol. 13
·期 2
·323
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IF 3.9
Yu Han,Lijie Xu
In this study, both wood flour (WF) and wood flour-derived biochar (WFB) were used as supports for Fe3O4to activate peroxydisulfate (PDS). The role of different carriers was investigated emphatically from the aspects of catalyst properties, the degradation kinetics of bisphenol A (BPA), the effects of important parameters, and the generation of reactive oxygen species (ROS). Results showed that both WF and WFB could serve as good support for Fe3O4, which could control the release of iron into solution and increase the specific surface areas (SSAs). The WFB/Fe3O4had stronger PDS activation capability than WF/Fe3O4mainly due to the larger SSA of WFB/Fe3O4and the PDS activation ability of WFB. Both radical species (•OH and SO4•−) and non-radical pathways, including1O2and high-valent iron-oxo species, contributed to the degradation of BPA in the WFB/Fe3O4–PDS process. Moreover, the WFB/Fe3O4catalyst also showed stronger ability to control the iron release, better reusability, and higher BPA mineralization efficiency than WF/Fe3O4.Keywords:wood flour;biochar;peroxydisulfate;bisphenol A;Fe3O4;activation
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COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Xinyue Wang,Huan Cheng,Yuanzhi Min,Xian Li,Lijun You,Jumei Li
In this study, a crystalline mesoporous ZrO 2 interlayer allowing for enrichment capability and photocatalytic activity was introduced to develop a novel magnetic Fe 3 O 4 /m-ZrO 2 /Ag nanocomposite combined with excellent SERS activity and photocatalytic property. The coverage of Ag nanoparticles on Fe 3 O 4 /m-ZrO 2 /Ag was well controlled to tune their SERS sensitivity by varying the feed amount of AgNO 3 . Several characterization methods were utilized to investigate their composition, morphology and crystal structure. The SERS experiments demonstrated Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites possessed markedly SERS sensitivity, exceptional signal reproducibility and excellent storing stability. They could sense R6G and Cr (VI) at the concentrations of 10 −9 and 5 × 10 −8 M, respectively. Beyond that, the Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites effectively accomplished recyclable detecting R6G and Cr (VI) in 5 cycles through facile photocatalytic removal of pollutants under UV irradiation. Altogether, the novel Fe 3 O 4 /m-ZrO 2 /Ag nanocomposites prepared in this study have high SERS sensitivity and good photocatalytic performance, which is of great significance for environmental detection and ecological restoration.
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TALANTA
·
2022
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IF 6.556
Jinpeng Tao,Zaiqiong Liu,Zhenyu Zhu,Yanli Zhang,Hongbin Wang,Pengfei Pang,Chun Yang,Wenrong Yang
An ultrasensitive electrochemical detection of the activity and inhibition of T4 polynucleotide kinase (T4 PNK) was developed by using magnetic Fe 3 O 4 @TiO 2 core-shell nanoparticles , which was triggered by a rolling circle amplification strategy (Fe 3 O 4 @TiO 2 -RCA). We used Fe 3 O 4 @TiO 2 as a substrate to anchor a DNA primer . DNA S1 with 5′-OH termini was phosphorylated in the presence of T4 PNK and ATP, which was adsorbed on the surface of Fe 3 O 4 @TiO 2 NPs and served as the primer for subsequent RCA reactions. After adding circular template DNA S2, RCA was initiated in the presence of phi29 DNA polymerase and dNTPs. Then, Fc-labeled DNA S3 (Fc-S3) was hybridized with RCA. The obtained Fe 3 O 4 @TiO 2 -RCA was adsorbed on the surface of a magnetic gold electrode (MGE) by magnetic enrichment, resulting in an enhanced electrochemical signal. The T4 PNK activity can be monitored by measuring the electrochemical signal generated. This electrochemical assay is sensitive to the activity of T4 PNK with a dynamic linear range of 0.00001–20 U/mL and a low detection limit of 3.0 × 10 −6 U/mL. The proposed strategy can be used to screen the T4 PNK inhibitors, so it has great potential in the discovery of nucleotide kinase-target drug and early clinical diagnosis of cancer.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xiaotong Chen,Qiaohan Li,Huiqiang Li,Ping Yang,Zilong Zou
A novel nickel foam (NF) supported core–shell catalytic material with excellent catalytic performance was successfully prepared for the degradation of salicylic acid (SA) by heterogeneous electro-Fenton (HEEF). Under the reaction conditions of SA initial concentration of 100 mg/L, catalyst dosage of 4 g/L, aeration rate of 0.1 L/min, current of 0.3 A and pH of 7, after 2 h, the removal efficiency of the progressively modified core–shell catalysts for SA and COD was as follows: NF@Fe 3 O 4 @SiO 2 @MgAl-LDH > NF@Fe 3 O 4 @MgAl-LDH > NF@Fe 3 O 4 > NF@Fe 3 O 4 @SiO 2 . The removal efficiency of NF@Fe 3 O 4 @SiO 2 @MgAl-LDH for SA and COD reached 72.8 % and 52.12 %, respectively. The morphology, composition and structural characteristics of the composite catalysts were analyzed and compared by a series of characterization methods. Among them, NF@Fe 3 O 4 @SiO 2 @MgAl-LDH showed the largest Fe:Ni atomic content ratio, specific surface area and pore volume, with values of 1: 2.62, 7.5405 m 2 ·g −1 and 0.010504 cm 3 ·g −1 , respectively. Radical quenching experiments, changes in H 2 O 2 and Fe 2+ ion concentrations, and X-ray photoelectron spectroscopy (XPS) analysis revealed the reaction mechanism of the HEEF process. That is, synergistic oxidation of active radicals and abundant adsorbed oxygen and lattice oxygen on the surface of the materials promoted the degradation and mineralization of SA. The excellent stability and reusability of NF@Fe 3 O 4 @SiO 2 @MgAl-LDH in the HEEF system were verified through five cyclic experiments with low material loss rate and sludge production.
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Molecular Catalysis
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2022
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IF 5.089
Pan Pan,Mingming Li,Yuxin Liu,Yisi Feng,Xinglong Li
2,5-diformylfuran (DFF) is a multifunctional intermediate, which can be used in drugs, functional polymers, fluorescent materials and surfactants. In this paper, a TEMPO-assisted magnetic Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) catalytic system was developed for the selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran. The structure of Fe 3 O 4 @SiO 2 @mSiO 2 -NH 2 -Cu(II) was double-layer shell-core spherical structure with uniform ordered mesoporous on the surface, amino groups and Cu were evenly distributed in the outer mesoporous. The catalyst was characterized by FT-IR, TEM, EDS, SEM, XRD, BET and VSM. The effects of reaction conditions were investigated in detail. The conversion of HMF was 98.9% and the highest DFF yield was 92.4% under atmospheric oxygen in toluene solvent. The catalytic activity did not decrease significantly after 5 cycles. The catalytic system had good substrate adaptability for benzyl alcohols and aromatic alcohols with satisfactory yield of corresponding aldehydes (91.3–100%). A possible reaction mechanism was also proposed and found that bis(μ-hydroxy) double copper (II) may be the active reactant in oxidation reaction. The system provides a promising industrialized preparation method for DFF.
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高影响因子
BIOELECTROCHEMISTRY
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2022
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IF 5.76
Yun Ni,Hezhong Ouyang,Lulu Yu,Chen Ling,Ziye Zhu,Aolin He,Ruijiang Liu
A label-free electrochemical aptasensor based on magnetic α-Fe 2 O 3 /Fe 3 O 4 heterogeneous hollow nanorods was developed for the detection of cancer antigen 125 (CA125). Magnetic α-Fe 2 O 3 /Fe 3 O 4 heterogeneous hollow nanorods were successfully prepared by the hydrolysis-calcination method, functionalized with polyethyleneimine (PEI), and modified with HAuCl 4 to form magnetic α-Fe 2 O 3 /Fe 3 O 4 -Au nanocomposites with a layer of 5 nm gold nanoparticles (Au NPs) on the surface. The magnetic α-Fe 2 O 3 /Fe 3 O 4 -Au nanocomposites were used to fix the DNA-aptamer probe to amplify the current signal. The intensity of the current signal was proportional to the concentration of CA125, indicating that the sensor was a turn-on sensor. The linear range of the electrochemical aptasensor was 5–125 U/mL ( R 2 = 0.9975), and the limit of detection (LOD) was 2.99 U/mL. The electrochemical aptasensor exhibited favorable specificity, reproducibility, and stability. The analytical performance of the aptasensor in real serum samples was also investigated.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
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IF 4.598
Lanlan Tian,Yuanlin Xie,Jing Lu,Qiang Hu,Yongneng Xiao,Tiefeng Liu,Bekchanov Davronbek,Xiaoquan Zhu,Xintai Su
A three-dimensional (3D) Fe 3 O 4 / N -doped graphene aerogel composite (Fe 3 O 4 /NGA) was constructed via a simplistic two-step method of hydrothermal reaction-roasting using iron (Ⅱ) phthalocyanine (FePc) and graphene oxide (GO) as raw materials. GO nanosheets can self-assemble into 3D aerogels and be converted into reduced graphene oxides (rGO) in the first step of the hydrothermal process. Further, Fe 3 O 4 /NGA with a strong chemical coupling can be obtained via roasting (the second step) based on the fact that FePc and rGO can be tightly combined under the chemical reaction of oxygen-containing functional groups. The electrochemical properties were studied by cyclic voltammetry, electrochemical impedance spectroscopy and galvanostatic charge/discharge measurements, which exhibit superior cycling performance with high rate capability as anode applied in a lithium-ion battery. The specific capacity of Fe 3 O 4 /NGA-90 was still up to 1184.8 mAh/g after 500 cycles at a current density of 1 A/g. These exciting results indicate that the 3D Fe 3 O 4 / N -doped graphene aerogel composite exhibits superior performance as an active material for the use of lithium-ion batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Qiang Peng,Meng Ma,Si Chen,Yanqin Shi,Huiwen He,Xu Wang
Developing excellent absorption-dominant electromagnetic interference (EMI) shielding composites is an urgent demand for the rapid development of 5 G technology and electronic equipment. Herein, a simple strategy is employed to fabricate carbon nanotubes-polypropylene fibers (CP) /polypropylene-glass fibers felt (PGFF)/Fe 3 O 4 composites with superior EMI shielding effectiveness and low reflection due to the magnetic-conductive bi-gradient structure which is naturally formed by deposition during the vacuum-assisted filtration process. The difference in dimensionality between one-dimensional CNT with outstanding electrical conductivity and zero-dimensional magnetic Fe 3 O 4 nanoparticles is the theoretical basis for the successful construction of the magnetic-conductive bi-gradient structure in a gap-rich PGFF matrix that endows the composites with “absorb-reflect-reabsorb” EMI shielding mechanism. When the electromagnetic waves are incident from the magnetic layer, the EMI shielding effectiveness (SE) reaches 48.9 dB as the weight percentage of the conductive layer increases, more importantly, the reflection coefficients are reduced by more than 0.32 compared with that of another incident pattern. What's more, the resultant composites exhibit an outstanding signal shielding function in the application. This work paves a convenient pathway for designing a magnetic-conductive bi-gradient structure and efficient absorbing EMI shielding composites applied in the next-generated electronic information and communication field.
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