JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2015
·
IF 3.368
Manlin Wang,Peng Liu,Yu Wang,Dongmei Zhou,Chen Ma,Dongju Zhang,Jinhua Zhan
The effective recognition and enrichment of trace polychlorinated biphenyls (PCBs) in the environment are currently challenging issues due to human health concerns. In this paper, a surface absorptive layer coating superparamagnetic Fe 3 O 4 nanoparticles for PCBs enrichment were prepared. This protocol involved the synthesis of Fe 3 O 4 particles through a solvothermal reaction and the covering of a silica layer bonded β-cyclodextrin (β-CD) over Fe 3 O 4 via a sol–gel process to construct core–shell Fe 3 O 4 @β-CD composites. β-CD was linked covalently to Fe 3 O 4 nanoparticles to generate the binding sites, enhancing the stability of Fe 3 O 4 nanoparticles in water. Meanwhile, superparamagnetic Fe 3 O 4 core could be rapidly separated from matrix to simplify time-consuming washing extraction. The adsorption capacity of Fe 3 O 4 @β-CD composites to PCB28 and PCB52 in aqueous solutions was investigated. To estimate the theoretical binding site number of Fe 3 O 4 @β-CD, the obtained binding data were replotted according to Scatchard equation. The host–guest interaction between β-CD and PCBs were further examined with density functional theory (DFT) calculations. It provides theoretical evidence of β-CD as host molecule has a higher binding amount towards PCB-28 than PCB-52 on the basis of their optimized geometries and calculated complexation energies. The nanomaterial reported herein is an ideal candidate for various applications, including the recognition and removal of environmentally deleterious substances.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2014
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IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2014
·
IF 4.058
Ran-ran Shan,Liang-guo Yan,Kun Yang,Shu-jun Yu,Yuan-feng Hao,Hai-qin Yu,Bin Du
Magnetic material as adsorbent can provide effective remove and quickly separate of pollutant in wastewater treatment. A magnetic Fe 3 O 4 /MgAl-layered double hydroxide (LDH) composite was prepared by low saturation coprecipitation in the dispersed Fe 3 O 4 suspension. The characterization of XRD, TEM and FTIR revealed that the Fe 3 O 4 /MgAl-LDH composite was combined with Fe 3 O 4 and MgAl-LDH. This provided the composite of magnetic property which improved the separation of solid from aqueous solution. The adsorption of reactive red (RR), congo red (CR) and acid red 1 (AR1) by magnetic Fe 3 O 4 /MgAl-LDH composite depended upon the adsorbent dosage, contact time, initial concentration and temperature. The adsorption of the three red dyes reached equilibrium at 30 min and followed the pseudo-second-order kinetic equation. The equilibrium adsorption isotherm data well fitted the Langmuir model for RR, Freundlich model for CR and AR1. Thermodynamic results demonstrated that the adsorption processes were spontaneous, endothermic for RR and CR or exothermic for AR1. The adsorption capacities changed insignificantly between solution pH 2–10 and the maximum were 97, 253 and 92 mg/g for RR, CR and AR1, respectively. Moreover, the solid composite can be quickly separated from the aqueous solution by an external magnet before and after adsorption process. This indicated that the magnetic Fe 3 O 4 /MgAl-LDH composite was an effective adsorbent for red dyes removal with quick separation.
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高影响因子
APPLIED SURFACE SCIENCE
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2014
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IF 2.538
Shaonan Lv,Yubei Song,Yaya Song,Zhigang Zhao,Changjing Cheng
Herein, we report a facile method to prepare beta-cyclodextrin (β-CD)-conjugated magnetic Fe 3 O 4 colloidal nanocrystal clusters (Fe 3 O 4 @GLY-CD) using (3-glycidyloxypropyl) trimethoxysilane (GLY) as the intermediate linker. The resulting Fe 3 O 4 @GLY-CD was characterized by several methods including Fourier transform infrared (FT-IR) spectroscopy, field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM), dynamic light scattering (DLS), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and vibrating sample magnetometer (VSM). In addition, the loading and release properties of the synthesized Fe 3 O 4 @GLY-CD for the hydrophobic molecule 8-anilino-1-naphthalenesulfonic acid ammonium salt (ANS) were also investigated. The results show that the Fe 3 O 4 @GLY-CD has a spherical structure with an average diameter of 186 nm and high saturated magnetism of 51.2 emu/g. The grafting of β-CD onto Fe 3 O 4 colloidal nanocrystal clusters can markedly increase the loading capacity of ANS because of β-CD/ANS inclusion complex formation. The in vitro delivery profile shows that the release of ANS from the Fe 3 O 4 @GLY-CD nanosystem exhibits an initial burst followed by a slow and steady release. Moreover, Fe 3 O 4 @GLY-CD also demonstrates a temperature-dependent release behavior for ANS owing to the effect of temperature on the association constants of β-CD/ANS inclusion complexes. The developed magnetic hybrid nanomaterial is expected to find potential applications in several fields including separation science and biomedicine.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2013
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IF 2.108
Yi Yang,Xiao Chen,Dandan Huang,Wei Ye
Being considered as building blocks, the inorganic nanodimer particles such as Ag-Fe 3 O 4 , Cd-Se and Pt-Fe 3 O 4 , have attracted much attention because of their capability of dual surface functionalization and potential applications in field-emission, data storage and photovoltaic devices. For these motivations and as a continuation of our previous study, a gel with flower-like morphology based on Ag-Fe 3 O 4 nanodimers has been constructed with the carboxylated cyclodextrin (MAH-CD) and Pluronic F127 molecules in mixed solvent of cyclohexane and water. The morphology of Ag-Fe 3 O 4 nanodimers and structure of MAH-CD were characterized by transmission electron microscopy (TEM) and nuclear magnetic resonance (NMR) respectively. The mechanism of gel formation is discussed along with the data obtained from rheological measurement, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Each Ag-Fe 3 O 4 particle was coated by lots of MAH-CD molecules, which were threaded by F127 chains. The gel fabrication is controlled by the inclusion of MAH-CD with F127, the interaction between the carboxyl group and the Fe 3 O 4 surface. The cyclohexane molecules in gel were trapped with F127 by cyclodextrin, which may be packed orderly through hydrogen bond. Meanwhile, the Fe 3 O 4 side of nanodimers provides the anchoring position for carboxyl group to induce the formation of gel. Such an Ag-Fe 3 O 4 nanodimer initiated gel can be used either based on Ag side for catalytic and sensing properties, or based on superparamagnetism from Fe 3 O 4 side.
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高影响因子
CATALYSIS COMMUNICATIONS
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2013
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IF 2.915
Jie Cui,Ting He,Xu Zhang
Platinum ion doped magnetic TiO 2 (Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 ) hybrid microspheres with uniform magnetic cores were synthesized and characterized in this work. The results indicate that the photoactivity of Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is much higher than Fe 3 O 4 @SiO 2 @TiO 2 for the decolorization of acid orange 20 under UV–visible light irradiation. The trend for the final degradation ratio with Fe 3 O 4 @SiO 2 @Pt ion –TiO 2 is quite small, even after seven repetitive experiments. These data indicate that the magnetic microspheres possess the potential to be effective and stable catalysts. The results demonstrate that the Pt ion doped magnetic catalyst meets the needs for both immobilization and high photoactivity.
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高影响因子
Journal of Materials Chemistry C
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2015
·Vol. 3
·期 39
·10232-10241
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IF 4.696
Hualiang Lv,Guangbin Ji,Wei Liu,Haiqian Zhang,Youwei Du
Hierarchical hollow carbon@Fe@Fe3O4 nanospheres were synthesized by a simple template method and another pyrolysis process. Interestingly, the thickness of hollow carbon spheres is tunable by a simple hydrothermal approach. The as-prepared carbon@Fe@Fe3O4 shows excellent microwave absorption properties. In detail, the maximum effective frequency is up to 5.2 GHz with an optimal reflection loss value of −40 dB while the coating thickness is just 1.5 mm. Meanwhile, such absorption properties can be maintained via controlling the thickness of the hollow carbon. For instance, in another coating layer of 2 mm, the effective frequency is still more than 5 GHz as the carbon thickness declines to 12 nm. As novel electromagnetic absorbers, the composites also present the lower density feature due to the hollow carbon sphere frame. The excellent electromagnetic absorption mechanism may be attributed to the obvious interface polarization, and strong magnetic loss ability resulting from the Fe and Fe3O4 shell. Besides, owing to the dielectric feature of carbon, the hollow carbon core is beneficial for the attenuation ability.
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高影响因子
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
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2017
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IF 2.962
Yu Jiang,Tao Deng,Yu Shang,Kai Yang,Hongyu Wang
Phenol-containing industrial wastewater disposal has received much attention in recent years due to its toxicity and slow biodegradation. In this work, the isolated fungal strain Debaryomyces sp. was entrapped into Ca-alginate beads with nanoscale Fe 3 O 4 to improve phenol biodegradation ability. Freely suspended cells as well as Ca-alginate immobilized cells without nanoscale particles were also prepared. Phenol removal by free cells and two kinds of Ca-alginate beads was evaluated with different initial phenol concentrations, temperatures, and salinities . The phenol biodegradation kinetics and optimal dosage of nano-Fe 3 O 4 during the preparation of Ca-alginate beads were also determined. The results showed that immobilized Debaryomyces strain had better biodegradation performance than free cells under harsh conditions. Phenol removal rates were highest when using magnetically immobilized cells, followed by nonmagnetically cells. More than 99.9% of phenol was degraded within 80 h by immobilized cells with nano-Fe 3 O 4 when initial phenol concentration was over 900 mg L −1 while the phenol removal efficiencies of free cell and immobilized cells without nano-Fe 3 O 4 were 34.5% and 81.3%, respectively during the same periods of time. The reusability tests were carried out and the results indicated good stability of immobilized cells in saline environments, which was practical in actual industrial wastewater treatment .
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高影响因子
Journal of Saudi Chemical Society
·
2016
·
IF 1.978
Bingzhen Li,Xiaodi Weng,Guojing Wu,Yang Zhang,Xuliang Lv,Guangxin Gu
Fe 3 O 4 /PPy/PANI (Fe 3 O 4 /polypyrrole/polyaniline) nanocomposites with excellent microwave absorbing properties have been successfully synthesized and characterized systematically. In detail, Fe 3 O 4 nanoparticles were prepared via an environmental friendly, modified co-precipitation method. Afterward, two conductive polymers, PPy and PANI, were deposited onto the surface of Fe 3 O 4 nanoparticles by in-situ polymerization of pyrrole and aniline. PPy and PANI was “glued” by the strong affinity between the carbonyl groups of PPy and the conjugated chains of PANI. The obtained Fe 3 O 4 /PPy/PANI nanocomposites have been found to possess excellent microwave absorbing property with the absorption bandwidth of 10.7 GHz (6.7–17.4 GHz) and maximum reflection loss at 10.1 GHz (−40.2 dB). It proves that the combination of ultra-small Fe 3 O 4 nanoparticles with two different conductive polymers have a great potential in the application of microwave absorbing materials.
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高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Chuanxin He,Minsui Xie,Fei Hong,Xiaoyan Chai,Hongwei Mi,Xuechang Zhou,Liangdong Fan,Qianling Zhang,To Ngai,Jianhong Liu
This study presents the synthesis and characterization of a novel glucose electrochemical biosensor based on gold nanoparticles/bovine serum albumin/Fe 3 O 4 (AuNPs/BSA/Fe 3 O 4 ) composite nanoparticles . The prepared magnetic composite nanoparticles consist of a BSA protein shell, providing biocompatible environment for enzyme immobilization. Furthermore, in situ immobilization of gold nanoparticles greatly enhances the performance of electron transfer. Using these composite nanoparticles, the model enzyme, glucose oxidase (GOx) was readily adsorbed to surface so as the GOx/AuNPs/BSA/Fe 3 O 4 electrochemical biosensor was developed. The electrochemical performance of the biosensor was characterized by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronoamperometry. Under the optimal preparation conditions, the resultant biosensor has a short response time of 0.8 s, an excellent sensitivity of 115.3 μA mM −1 cm −2 , and a linear dynamic range from 0.25 to 7.0 mM with a low detection limit of 3.54 μM (S/N = 3). The high sensitivity, good reproducibility and stability of the biosensor presented in this study show that the as-prepared AuNPs/BSA/Fe 3 O 4 composite nanoparticles are a promising material for the development and construction of biosensors.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Nailing Gao,Ziyang Lu,Xiaoxu Zhao,Zhi Zhu,Youshan Wang,Dandan Wang,Zhoufa Hua,Chunxiang Li,Pengwei Huo,Minshan Song
In order to realize the rational utilization of waste, C/Fe 3 O 4 was obtained by using biomass as the carbon source and prepared via one-step method, afterwards, a double conductive C/Fe 3 O 4 /Bi 2 O 3 composite photocatalyst was further synthesized via solvothermal method. Due to the good double conductivity, the electrons in Bi 2 O 3 could be transported to C/Fe 3 O 4 , which greatly inhibited the recombination of electron-hole pairs, it is worth noting that the double conductivity effectively blocked the reverse transfer of electrons to Bi 2 O 3 . Consequently, the photodegradation rate of C/Fe 3 O 4 /Bi 2 O 3 composite photocatalyst reached 91%, which was much higher than that of pure Bi 2 O 3 . In addition, the mechanism exploration experiment showed that h + was the main activity specie, meanwhile, the photocatalytic electron transfer mechanism was also investigated.
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高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
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2017
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IF 2.538
Xin Di,Wenbo Zhang,Zishuai Jiang,Ming Zhang,YaZhou Wang,Feng Liu,Shih-Hsin Ho,Chengyu Wang
A novel method is demonstrated for effective separation of surfactant-free oil-in-water emulsions via hydrophobic and lipophilic Fe 3 O 4 /sawdust composites (HFSCs) under magnetic stirring. The HFSCs were able to capture micron-sized oil droplets from the emulsion under electromagnetic stirring due to its adsorption, underwater lipophilicity and exceptional magnetic property. Surfactant-free oil-in-water emulsions, such as diesel, toluene and soybean, were separated less than 1.5 min. After being measured by a total organic carbon analyzer, the initial content of toluene was reduced by 97.6% in separated emulsion, demonstrating that the toluene was almost entirely removed from the emulsion. Furthermore, for water-in-oil emulsions, the oil is selectively allowed to pass through HFSCs-based composite membranes with initial flux of ∼1134 L m −2 h −1 and oil purity of the filtrate more than 99.9%. Moreover, the HFSCs can be reused for emulsion separation at least 10 times with little reduction of water contact angles (WCAs) and initial fluxes. The purity of the toluene filtrate was no less than 97% in the last separation. Therefore, the cost-effective and easily-operated preparation, reusable and eco-friendly material and convenient and efficient emulsions separation methodology offer great technological promise in the field of wastewater treatment , cleanup of oil spills, and fuel purification .
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高影响因子
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