ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Ting Zhou,Min Fan,Ruiyun You,Yudong Lu,Luqiang Huang,Yunchao Xu,Shangyuan Feng,Yang Wu,Huiying Shen,Lanjin Zhu
We have successfully prepared a highly sensitive sandwich nanosensor combined Fe 3 O 4 and [email protected] @Ag nanorods for histamine detection based on surface-enhanced Raman spectroscopy (SERS). The Fe 3 O 4 beads with –COOH served as a capture part to enrich histamine. The [email protected] @Ag core-shell nanorods functionalized with Nalpha,Nalpha-Bis(carboxymethyl)- l -lysine (AB-NTA) were then used to connect with the imidazolyl group of histamine, simultaneously the internal standard 4-aminothiophenol (4-ATP) in the core-shell structure was used as the SERS signal. PLS regression model based on concentration range 10 −3 -10 −8 mol/L showed a linear trend with R 2 = 0.9907. Our new approach can quickly and reliably determine histamine in fish sample and RAW264.7 cell lysates. This protocol for histamine extraction and SERS analysis enables the development of ultra-sensitive method for histamine detection.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 7
·2847-2857
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IF 3.288
Mingxing Nie,Yulian Li,Junyong He,Chao Xie,Zijian Wu,Bai Sun,Kaisheng Zhang,Lingtao Kong,Jinhuai Liu
Fe3O4 nanospheres (Fe3O4-S) synthesized via a facile one-pot solvothermal method were used for H2O2 activation and tetracycline (TC) elimination from aqueous solutions. It can be found that more than 80% of TC was degraded in the Fe3O4-S/H2O2 system. Besides, batch experiments were conducted to investigate the effects of different parameters such as catalyst dosages, H2O2 concentration, pH values and temperature on the degradation of TC, and these experimental results were also described by the pseudo-first-order model. Radical quenching experiments and an electron paramagnetic resonance (EPR) technique revealed that ˙OH and ˙O2−/˙HO2 were involved and ˙OH generated on the surface of Fe3O4-S played a main role in TC degradation. The XPS observations demonstrated that the surface FeII participated in the H2O2 activation through the redox reactions. Moreover, thirteen intermediate products were monitored by the LC–MS and possible degradation pathways of TC were accordingly proposed. The Fe3O4-S catalyst exhibited good reusability and the catalytic performance of it did not show any significant decrease even after five trials. It was worth noting that the optimal pH for TC degradation was expanded to neutral pH conditions by using the Fe3O4-S/H2O2 system. Additionally, Fe3O4-S was easily separated from the reaction solutions by virtue of its magnetism (66.8 emu g−1), which is beneficial for reuse of the catalysts.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 16
·6635-6642
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IF 3.288
Mingyu Tang,Guojuan Ren,Fang Chai
This article reports a one-pot hydrothermal strategy for preparing fluorescence carbon dots with magnetic properties (Fe3O4-CDs). Ammonium ferric citrate (AFC) and urea served as the iron and nitrogen sources and both as carbon sources were put into the reaction solvent diethylenetriamine (DETA), which acted as a reductant and nitrogen provider in the process of the synthesis of Fe3O4-CDs. Further, a sensitive and rapid method based on the Fe3O4-CDs was utilized for the detection of Hg2+, simultaneously accompanied with a magnetic removal process. Good linearity was obtained in the range from 2.0 to 200.0 nM with a detection limit of 12.6 nM. The fluorescence quenching mechanism was proved to be caused by an inner-filter effect (IFE) and static quenching effect (SQE). More, this platform was successfully applied for the analysis of Hg2+ in a real sample with satisfying recovery results, thus demonstrating its utility as a convenient monitoring strategy.
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高影响因子
Processes
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2020
·Vol. 8
·期 5
·629
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IF 2.753
Yanhong Bi,Zhaoyu Wang,Rui Zhang,Yihan Diao,Yaoqi Tian,Zhengyu Jin
In this study, magnetic Fe3O4nanoparticles coated with polydopamine possessing abundant amino groups (Fe3O4@PDA) were conveniently prepared, detailed, and characterized, and then firstly used as a supporting matrix for immobilizingThermomyces lanuginosuslipase (Fe3O4@PDA@TLL). The effects of some crucial factors on the immobilization efficiency were investigated and the optimal protein loading and activity recovery were found to be 156.4 mg/g and 90.9%, respectively. Characterization studies revealed that Fe3O4@PDA@TLL displayed a broader pH and temperature adaptability as compared to the free TLL, which allows its use at wider ranges of reaction conditions. With regard to the stabilities, the immobilized TLL clearly displayed improved pH, thermal, and solvent tolerance stabilities compared to the free enzyme, suggesting that the biocompatible Fe3O4@PDA might be an outstanding material for immobilizing TLL and acting as alternative support for different enzymes.Keywords:magnetic nanoparticle;immobilization;Thermomyces lanuginosuslipase;stability
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Zelin Wu,Yupeng Wang,Zhaokun Xiong,Zhimin Ao,Shengyan Pu,Gang Yao,Bo Lai
A core-shell metal-organic framework encapsulated Fe 3 O 4 magnetic particles (Fe 3 O 4 @Zn/Co-ZIFs) was designed and synthesized successfully to activate peroxymonosulfate (PMS) for carbamazepine (CBZ) degradation. It exhibits superior catalytic performance since the unique interior structure and synergistic effect between ZIFs shell and Fe 3 O 4 core, achieving 100% removal of CBZ (5 mg/L) within 30 min. The outer wrapping structure of ZIF-8 can stabilize the ZIF-67 and Fe 3 O 4 under intricate reaction conditions to restrain the leaching of Co ions (as low as 0.067 mg/L). Further investigation found that both SO 4 – and OH contribute to the degradation of CBZ at initial stage, and SO 4 – gradually plays a pivotal role with the reaction time prolonging. The acceleration of electron transfer between Fe 3 O 4 and cobalt active sites of Zn/Co-ZIFs could induce the redox cycling of Co 2+ and Co 3+ . The possible degradation pathway was proposed by analyzing intermediates. This work extends the development of MOFs materials for environmental remediation.
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高影响因子
Micro & Nano Letters
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2020
·Vol. 15
·期 7
·425-429
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IF 0.975
Yuqiong Shi,Beibei Qiu,Xiangrong Wu,Yuxuan Wang,Jinhua Zhu,Xiuhua Liu,Dongbao Zhao
To extend the wide application range of luteolin (LUT), a slow-release drug delivery system is urgently needed. In this work, Fe 3 O 4 @ZIF-67 was reported as the carrier of LUT. A facile synthesis method of Fe 3 O 4 @ZIF-67 was established with simply continuous stirring. The structure and function of the nanocomposites were characterised by SEM, TEM, XRD, FTIR, VEM and TGA. Under the optimal reaction conditions, the maximum drug loading capacity of the carrier was obtained to be 308.07 µg/mg. And LUT was released about 55% from Fe 3 O 4 @ZIF-67 after 72 h. The adsorption kinetics and release kinetics of LUT were also investigated. The results showed that the relationship between time and drug loading fitted well with the quasi-second-order kinetic equation ( R 2 = 0.99) and the release mechanism followed the Sigmoidal model ( R 2 = 0.98). In short, Fe 3 O 4 @ZIF-67 could be developed as a carrier of the LUT delivery system for slow release.
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高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 7
·1370
·
IF 4.324
Zhenfeng Lin,Ziwei Pan,Yuhao Zhao,Lin Qian,Jingtao Shen,Kai Xia,Yongfu Guo,Zan Qu
PPy-Fe3O4/Kaolin was prepared with polypyrrole functionalized magnetic Kaolin by a simple, green, and low cost method to improve the agglomeration and low adsorption capacity of Kaolin. PPy-Fe3O4/Kaolin was employed to remove Hg2+and the results were characterized by various methods. Relevant factors, including solution pH, dosage of adsorbent, concentration (C0), and temperature (T), were optimized by Response Surface Methodology (RSM) and Central Composite Designs (CCD). The optimal results show that the importance for adsorption factors is pH >T>C0> dosage, and the optimal adsorption conditions of PPy-Fe3O4/Kaolin are pH = 7.2,T= 315 K,C0= 50 mg/L, dosage of 0.05 g/L, and the capacity is 317.1 mg/g. The adsorption process conforms to the pseudo-second-order and Langmuir models. Dubinin–Radushkevich model shows that adsorption process is spontaneous and endothermic. Moreover, the adsorption of mercury by PPy-Fe3O4/Kaolin was achieved mainly through electrostatic attraction, pore diffusion, and chelation between amino functional groups and Hg2+. PPy-Fe3O4/Kaolin has excellent reproducibility, dispersity, and chemical stability, and it is easy to be separated from solution through an external magnetic field. The experiments show that PPy-Fe3O4/Kaolin is an efficient and economical adsorbent towards mercury.Keywords:magnetic material;polypyrrole;kaolin;response surface methodology;mercury
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PubMed
高影响因子
SOLAR ENERGY
·
2019
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IF 4.674
Lei Shi,Xinzhi Wang,Yanwei Hu,Yurong He
The significant improvement in photocatalytic activity achieved in recent years has generated widespread attention due to its utilization in solar energy. In this study, two shapes of magnetic nanoparticles were synthesized using hydrothermal method. The magnetic nanoparticles exhibited superior photocatalytic activity for water treatment, which takes into consideration the photo-thermal conversion of magnetic nanoparticles. The effect of morphology on the photo-degradation was analyzed by the specific surface area measurement and photoluminescence test. Furthermore, the suspension degradation rate with magnetic nanoparticles was enhanced by ~200% compared to a commercial photocatalyst. Moreover, the photo-degradation efficiency further increased from 96.4 to 99.6% with the magnetic field intensity increased because of the absorbance ability enhancement. This result indicates that the photocatalytic activity of a magnetic photocatalyst can be enhanced through photo-thermal conversion and magnetic field regulation, which expands the application of solar power technology.
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 44
·期 4
·1313-1319
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IF 3.069
Xu Yang,Kunhao Yang,Li Wu,Jingkui Yang,Yujian He
Magnetic nanoparticles containing multiform heteroatoms on their surface have great potential for metal-ion recovery with a high throughput. In this study, a novel adsorbent (Fe3O4@CPTES@PEG) was developed to adsorb Au(III) from aqueous solution, which was synthesized by functionalizing Fe3O4 magnetic nanoparticles with poly(ethylene glycol) via a simple two-step reaction. Various techniques including Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the adsorbent, demonstrating that poly(ethylene glycol) was successfully grafted onto the Fe3O4 magnetic nanoparticles. Batch experiments were performed to investigate the effects of the initial concentration of Au(III), contact time and coexisting ions on the absorption of Au(III) from an aqueous solution at pH = 1.0. Simultaneously, the adsorption process was well-fitted with the Langmuir and pseudo-second-order models. The as-synthesized core–shell structured Fe3O4@CPTES@PEG showed a high performance towards Au(III) adsorption with the maximum adsorption capacity of about 83 mg g−1. Significantly, the material exhibited highly selective adsorption toward Au(III) in the presence of coexisting ions (Fe(III), Mn(II), Pb(II), Cd(II), Cu(II), Cr(III), Al(III), Mg(II), Zn(II) and Au(III)). Also, the material could be regenerated using ferrous sulfate, and exhibited excellent reutilization for at least three times without significant loss in its adsorption capacity after a simple post-treatment. Therefore, the proposed method shows enormous potential for practical applications in the selective separation and enrichment of Au(III) from aqueous solution at pH = 1.0.
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高影响因子
DESALINATION
·
2019
·
IF 6.035
Liangliang Dong,Minghui Li,Shuo Zhang,Xuejian Si,Yunxiang Bai,Chunfang Zhang
Graphene oxide (GO)-based nanofiltration membranes, featuring well-ordered microscopic structure, well-defined 2D nanochannels and superior molecular sieving ability, have attracted sustained research interest in molecular and ionic separation. However, most of current GO laminar membrane have a poor water flux and high rejection of both dyes and salts, which is not suitable for the dye/salt mixture separation. Herein, we report a vacuum filtration strategy to fabricate GO/NH 2 -Fe 3 O 4 nanofiltration membranes with high water flux and excellent separation performance for dye/salts mixture by introducing NH 2 -Fe 3 O 4 . The NH 2 -Fe 3 O 4 is not only worked as the rigid spherical nanospacer to tune GO interlayer spacing but also as crosslinkers to improve the stability of GO membrane in water. FTIR, XRD , SEM , zeta potential and contact angle were applied to analyze the chemical composition and morphology of as-prepared membranes. The effect of intercalated NH 2 -Fe 3 O 4 nanoparticles on overall performance of the GO/NH 2 -Fe 3 O 4 membranes was systematically investigated. The resulted membrane with 8 wt% of NH 2 -Fe 3 O 4 loading has high water flux of up to 78 Lm − 2 h − 1 , which is 4.8 times higher than that of pure GO membrane. Moreover, such membrane also displays high congo red rejection (94%) and low NaCl rejection (~15%), rendering the membranes promising for dye/salt mixtures separation.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Yonghong Wang,Lecheng Sheng,Xinru Zhang,Jinping Li,Rong Wang
Carbon molecular sieve (CMS) membranes have great promise in CO 2 capture. However, tortuous transport passageways restrict the enhancement in the permeability due to the presence of disordered porous structure and dead-end pore. Herein, the growth of ZIF-8 layer on the surface of Fe 3 O 4 formed magnetic core-shell Fe 3 O 4 @ZIF-8 particles, which were fixed into 6FDA/ODA:DABA polyimides under magnetic field-induction to fabricate a precursor membrane with vertically oriented chain-like particles. It was then pyrolyzed to form hybrid carbon molecular sieve (HCMS) membranes with ordered microporous structure under high temperature conditions. The cross-section scanning electron microscopy images and N 2 adsorption for resultant HCMS membranes indicate that Fe 3 O 4 @ZIF-8-derived carbons frameworks were vertically oriented to form the ordered microporous structure, which also had good compatibility with carbon matrix stemmed from 6FDA/ODA:DABA polyimides. The as-prepared HCMS membranes embedded with 5 wt% Fe 3 O 4 @ZIF-8 manifested a highest gas separation performance (permeability of 5130 Barrer; CO 2 /N 2 selectivity of 29; CO 2 /CH 4 selectivity of 48), outperforming the pristine CMS membranes, which were near and beyond 2019 CO 2 /N 2 and CO 2 /CH 4 upper bounds, separately. These good separation performances resulted from vertical chain-like microporous particles, which provided fast transport channels to accelerate CO 2 diffusion rate. In addition, we supposed that Fe 3 O 4 prevent ZIF-8 frameworks from destruction during the pyrolysis and promote the size screening capability. More importantly, this membrane exhibited excellent aging resistance over 30 days aging testing compared to pristine CMS membranes. Therefore, it affords a feasible way for carbon capture from flue gas and natural gas.
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高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jie Tian,Junyan Wei,Yeping Liang,Ruixue Guo,Beibei Li,Ruijuan Qu,Dongmei Zhou,Zunyao Wang,Ping Sun
This study aimed to investigate the catalytic performance of Fe 3 O 4 /ZnO in the ozonation of 1-hexyl-3-methyl imidazolium bromide ([HMIM]Br). The Fe 3 O 4 /ZnO composite was prepared by a quick and convenient two-step coprecipitation method, and the optimum mass ratio of Fe 3 O 4 :ZnO was determined as 1:8. The structure, surface morphology, and chemical composition of the Fe 3 O 4 /ZnO composites were studied by characterization methods. The degradation efficiency of [HMIM]Br reached 96% in 5 min in catalytic ozonation with the Fe 3 O 4 /ZnO composite, an increase of 20% compared with ozonation alone. Moreover, the pseudo-first-order rate constant was 1.5 times higher than ozonation alone. With the increase in the catalyst dosage, the degradation efficiency of [HMIM]Br first improved and then decreased, and the optimum dosage was 0.25 g/L. The increase in pH value and the introduction of Cu 2+ effectively promoted the catalytic ozonation of [HMIM]Br with Fe 3 O 4 /ZnO, while the reducing inorganic ions inhibited the ozonation reaction. Different water matrices had little influence on the catalytic performance of Fe 3 O 4 /ZnO. Radical scavenging and EPR experiments showed that hydroxyl radicals (•OH), superoxide radicals (O 2 •- ) and singlet oxygen ( 1 O 2 ) were the main active species in this system. Meanwhile, product identification showed that the degradation of [HMIM]Br mainly included hydroxylation, imidazole ring cleavage and bond cleavage. Toxicity prediction illustrated that the catalytic ozonation of [HMIM]Br could effectively reduce its toxicity. The efficiency, toxicity, reusability, and stability experiments suggested that the developed catalyst, Fe 3 O 4 /ZnO composite, had promising prospects in catalytic ozonation.
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高影响因子
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