SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Meiling Wang,Guowen Meng,Qing Huang,Yilin Lu,Yao Gu
A prototype of fluorescence sensor, based on 1,4-dihydroxyanthraquinone (1,4-DHAQ) derivative and 9-fluorenylmethyl chloroformate (Fmoc-Cl) co-modified Fe 3 O 4 magnetic nanoparticals (MNPs) (denoted as 1,4-DHAQ/Fmoc-Cl co-modified Fe 3 O 4 MNPs), has been achieved via solvothermal synthesis of amine-functionalized Fe 3 O 4 MNPs and subsequent surface co-modification of 1,4-DHAQ derivative and Fmoc-Cl onto the Fe 3 O 4 MNPs. The 1,4-DHAQ/Fmoc-Cl co-modified Fe 3 O 4 MNPs can be used for not only simple rapid qualitative detection of Cu 2+ , Cd 2+ , Zn 2+ and Hg 2+ in aqueous solution, but also quantitative analysis of the above four heavy metal ions with lower detection limits of 8 × 10 −9 , 1.5 × 10 −8 , 10 −8 and 10 −8 M, respectively. This is the first prototype of fluorescence sensor that has potentials in the detection of Cu 2+ , Cd 2+ , Zn 2+ and Hg 2+ in aqueous solutions and even in drinking water . The sensor designing idea might be extended to other multifunctional chemosensors .
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DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 2
·49
·
IF 3.082
Chenhui Wang,Haobo Han,Wei Jiang,Xiaobo Ding,Quanshun Li,Yanbo Wang
Here, core-shell structured polydopamine-coated Fe3O4nanoparticles were constructed to immobilize thermostable lipase QLM fromAlcaligenessp. Systematical characterization indicated that lipase QLM was successfully immobilized on the surface of nanoparticles with an enzyme loading of 21.4 ± 1.47 mg/g immobilized enzyme. Then, the immobilized enzyme was demonstrated to possess favorable catalytic activity and stability in the ester hydrolysis, usingp-nitrophenyl caprylate as the substrate. Further, it was successfully employed in the kinetic resolution of (R,S)-2-octanol, and satisfactory enantioselectivity and recyclability could be obtained with an enantiomeric ratio (E) of 8–15 over 10 cycle reactions. Thus, core-shell structured polydopamine-coated Fe3O4nanoparticles can be potentially used as a carrier for enzyme immobilization to improve their activity, stability, and reusability, which is beneficial for constructing efficient catalysts for industrial biocatalysis.Keywords:lipase;immobilization;polydopamine;Fe3O4nanoparticle;core-shell structure;ester hydrolysis;kinetic resolution
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qingpeng Zhu,Jiaojiao Song,Zhaofei Liu,Konglin Wu,Xiangzi Li,Zhiming Chen,Huan Pang
Efficient and convenient degradation of industrial organic pollutants are of great importance for green chemical schemes and cost-effectiveness. This work introduced the immobilization of laccase on Fe 3 O 4 @SiO 2 nanoparticles (Fe 3 O 4 @SiO 2 -laccase) for photothermal catalytic degradation of textile dyes. The Fe 3 O 4 @SiO 2 -laccase presented excellent reusability, improved thermal and pH stabilities, and remarkable organic compounds, inhibitors and metal ions tolerance. Batch experiments indicate that the maximum loading amount and activity recovery for laccase were about 10.5 mg/g and 109.7%, respectively. Meanwhile, the immobilized laccase was employed for photothermal catalytic degradation of textile dyes. The degradation assays revealed that the initial removal efficiencies were 99.6%, 99.5%, 94.6%, 94.2%, 89.4% and 79.3% for high concentrations of malachite green (MG), brilliant green (BG), reactive blue 19 (RB19), azophloxine, procion red MX-5B and alizarin red in 30–60 min illumination, respectively. Even after 10 recycling cycles, the photothermal catalytic degradation rates of the textile dyes were observed at 98.7%, 99.3%, 88.8%, 79.0%, 78.7% and 64.4%, respectively. The outstanding photothermal catalytic performances demonstrated that the Fe 3 O 4 @SiO 2 -laccase has a technical application in wastewater treatment .
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高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Yan Xu,Jingjie Jin,Xianliang Li,Chaosheng Song,Hao Meng,Xia Zhang
A magnetic hybrid material (Fe3O4-embedded-MOF) consisting of a stable metal–organic framework HKUST-1 embedded with poly(N-vinyl-2-pyrrolidone) coated Fe3O4 microspheres was simply prepared under refluxing conditions for 4 h. The as-synthesized material was characterized using powder X-ray diffraction, scanning electron microscopy (SEM), vibrating sample magnetometry (VSM), energy dispersive spectroscopy (EDS) and N2 adsorption–desorption at 77 K. The hybrid material was studied for the adsorption of methylene blue from aqueous solution. The effects of dye concentration, adsorbent dose, and initial pH on the adsorption of methylene blue were measured, and from these experimental data, adsorption isotherms, kinetics, and thermodynamics were obtained. The results showed that a pseudo-second-order kinetic model and Langmuir isotherm (with R2 = 0.937) matched well for the adsorption of methylene blue onto Fe3O4-embedded-MOF. Thermodynamic parameters including free energy, enthalpy, and entropy of methylene blue adsorption were calculated, and the results showed that the adsorption of methylene blue were favorable on Fe3O4-embedded-MOF. The magnetic hybrid Fe3O4-embedded-MOF material features both magnetic separation characteristics as well as excellent adsorption performance for methylene blue in aqueous solution. The results of the present study demonstrate that Fe3O4-embedded-MOF is a promising adsorbent for the removal of dye from wastewater.
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DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Ji Fang,Xu Min,Wang Chao,Li Xiaoyuan,Gao Wei,Zhang Yunfei,Wang Baorui,Tang Guangping,Yue Xiaobin
The cubic Fe 3 O 4 nanoparticles with sharp horns that display the size distribution between 100 and 200 nm are utilized to substitute the magnetic sensitive medium (carbonyl iron powders, CIPs) and abrasives (CeO 2 /diamond) simultaneously which are widely employed in conventional magnetorheological finishing fluid. The removal rate of this novel fluid is extremely low compared with the value of conventional one even though the spot of the former is much bigger. This surprising phenomenon is generated due to the small size and low saturation magnetization ( M
s ) of Fe 3 O 4 and corresponding weak shear stress under external magnetic field according to material removal rate model of magnetorheological finishing (MRF). Different from conventional D-shaped finishing spot, the low M
s also results in a shuttle-like spot because the magnetic controllability is weak and particles in the fringe of spot are loose. The surface texture as well as figure accuracy and PSD1 (power spectrum density) of potassium dihydrogen phosphate (KDP) is greatly improved after MRF, which clearly prove the feasibility of substituting CIP and abrasive with Fe 3 O 4 in our novel MRF design.
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DOI
PubMed
高影响因子
Water
·
2021
·Vol. 13
·期 13
·1732
·
IF 3.103
Yuanyuan Yu,Yongjun Sun,Jun Zhou,Aowen Chen,Kinjal J. Shah
In this study, a high-efficiency magnetic heavy metal flocculant MF@AA was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of MF@AA flocculation to remove Cu(II) were studied. The characterization results show that MF@AA has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of MF@AA is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of MF@AA was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant MF@AA shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2017
·Vol. 55
·期 6
·662-668
·
IF 0.984
Ma Xiaowei,Feng Fan,Yang Yang,Dang Xueping,Huang Jianlin,Chen Huaixia
Fe3O4@MIL-100 (MIL, Material Institut Lavoisier) core–shell magnetic microspheres were prepared and applied as the sorbent for the magnetic solid phase extraction (MSPE) of N,N-diethyl-m-toluamide (DEET) in baby toilet water for the first time. The synthesized magnetic metal–organic frameworks were characterized by transmission electron microscope, infrared spectroscopy and thermogravimetric analysis. The functionalized magnetic microparticles showed excellent dispersibility in aqueous solution. The MSPE conditions were investigated in detail. Under the optimized conditions, an MSPE–high performance liquid chromatography method for the determination of DEET was developed. The method was linear in the concentration range from 5 to 500 μg L−1 for DEET in baby toilet water and good linearity (r2 > 0.9998) was obtained for the calibration curve. The limit of detection was 1.5 μg L−1. Both the intra-day and inter-day precisions (relative standard deviations) were <3%.
研究领域:
分析化学
·
环境科学
·
材料科学
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DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2024
·Vol. 26
·期 5
·1-13
·
IF 2.1
Sun Guohao,Hu Peixin,Lu Hechao,He Qinting,Ren Fang,Wu Juan,Jiang Wei
This study focuses on the synthesis and characterization of recyclable nano-adsorbents of magnetic nanocomposites (Fe 3 O 4 @ZnO-RGO). The Fe 3 O 4 nanoparticles were used as magnetic responders, ZnO coated on the surface of Fe 3 O 4 not only captured Cu 2+ but also prevented the oxidation of Fe 3 O 4 , and reduced graphene oxide (RGO) acted as Fe 3 O 4 @ZnO carrying platform could effectively adsorb Cu 2+ . The physical and chemical performance characterization suggested that the nano-adsorbents had stable structure, good hydrophilicity, and magnetic properties. Furthermore, the research results on adsorption performance indicated that the Fe 3 O 4 @ZnO-RGO had high adsorption properties for Cu 2+ , and the adsorption rate could reach more than 98%. The adsorption process conformed to the Langmuir model and second-order adsorption kinetics, and the adsorption of Cu 2+ was mainly chemisorption, accompanied by physical adsorption. In addition, because of the special magnetic response performance, Fe 3 O 4 @ZnO-RGO could be quickly separated from the solutions for cyclic adsorption so as to avoid secondary pollution. This provided a valuable idea for the effective development of clean and efficient Cu 2+ adsorbents, and the Fe 3 O 4 @ZnO-RGO had great application potential in the field of Cu 2+ wastewater treatment.
研究领域:
环境科学
·
材料科学
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2011
·Vol. 26
·期 9
·1072-1075
·
IF 1.402
Ruiyu Wang,Dan Chen,Lulu Ren,Juan Guo,Tianxi Liu
The preparation and characterization of Fe3O4 microtubes by a polymer-based template approach were described. Fe3O4 tubes with diameter of 600 ± 50 nm and an average tube thickness of about 50 nm were fabricated after removing the electrospun polystyrene fiber template. The microtubes were composed of individual Fe3O4 nanocrystals. The synthesis process was ambient, generalizable, inexpensive, and nontoxic. The magnetite tubes thus fabricated behave with a saturation magnetization of 37 emu/g measured in the vibrating sample magnetometer. The microtubes prepared in this way might find potential applications in catalysis, magnetic fluid, and biological field.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
Waste and Biomass Valorization
·
2018
·Vol. 11
·期 5
·1983-1988
·
IF 1.874
Chang Fei,Zhou Quan
Brønsted acidic ionic liquid supported on magnetic Fe 3 O 4 [ β -CD-6-Im-(CH 2 ) 3 -HSO 3 ][HSO 4 ]-Fe 3 O 4 was synthesized successfully, the catalyst was characterized via TGA, FT-IR, XRD, SEM, BET and acidity determination, and used to catalyze the high-acidic untreated Jatropha carcass L. seed crude oil (46.0 mg KOH/g) for biodiesel production in a single pot. The results showed that 94.70% yield of FAME was obtained under the optimized reaction conditions of temperature of 130 °C, 10:1 molar ratio of methanol to oil, 3 wt% of catalyst dosage, 3 h reaction time. In addition, the catalyst activity was not significantly decreased after five recycles.
研究领域:
化学工程
·
可再生能源
·
催化化学
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DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 14
·4431
·
IF 4.927
Xiangqian Li,Qin Wen,Jiannian Chen,Wenjie Sun,Yuhui Zheng,Chenggang Long,Qianming Wang
The presence of nitrite (NO2−) in water and food leads to serious problems in public health and the environment. Therefore, it is important to develop a rapid and efficient method for the selective detection of NO2−. In this work, the synthesis and characterization of magnetic Fe3O4@SiO2-TbDPA nanoprobe have been carried out. The Fe3O4@SiO2-TbDPA aqueous solution exhibits a strong green emission. Due to the addition of various concentrations of NO2−(0–100 μM), the fluorescence intensity has been suppressed. The nanoprobe Fe3O4@SiO2-TbDPA exhibits excellent selectivity and sensitivity toward NO2−ions. Excellent linearity is obtained in the range of 5–80 μM with a detection limit of 1.03 μM. Furthermore, the presence of magnetic Fe3O4nanoparticles in Fe3O4@SiO2-TbDPA nanospheres will also facilitate the effective separation of Fe3O4@SiO2-TbDPA from the aqueous solution. Our proposed strategy is expected to fabricate an organic-inorganic hybrid magnetic nanomaterial and can be used as an efficient sensor. It has been shown that this new strategy has numerous advantages, such as high stability, selectivity, and simplicity of operation. It demonstrates great potential for simple and convenient NO2−detection. It may expand to a variety of ranges in environmental monitoring and biomedical fields.Keywords:nitrite;core-shell nanospheres;fluorescent probe
研究领域:
分析化学
·
环境科学
·
生物医学工程
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PubMed
高影响因子
FUEL
·
2026
·
IF 7.8
Qianqian Chen,Subing Fan,Junmin Lv,Tiansheng Zhao
The purpose of the olefin hydroformylation-hydrogenation tandem reaction for alcohol synthesis is to design a highly efficient and stable heterogeneous catalyst. In this study, a novel heterogeneous magnetic nanoparticle-supported rhodium-cobalt bimetallic core–shell catalyst was prepared, which exhibits excellent synergistic catalytic performance and enables a one-step alcohol synthesis process. The magnetic support Fe 3 O 4 allows for rapid separation of the catalyst from reaction products under an external magnetic field. The 7.5Co0.5Rh/Fe 3 O 4 @SiO 2 magnetic core–shell catalyst was successfully prepared by loading active metals via a one-pot impregnation method and performing silica coating using the Stöber method. It shows outstanding olefin conversion (99.71%) and alcohol selectivity (91.17%). The effect of preparation conditions, process conditions, and the universality of substrates were investigated in detail. The catalyst was reused 5 times, and the performance differences between the core–shell catalyst and the traditional impregnated catalyst with the same support, as well as the differences in metal leaching during the reaction, were compared. In addition, the catalyst could participate in the reaction directly without prior reduction, avoiding the additional costs associated with subsequent reduction steps.
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