Materials Research Express
·
2019
·Vol. 6
·期 9
·0950c3
·
IF 1.449
Qianzhu Mu,Yanfeng Sun,Aiying Guo,Xiazhao Yu,Xiaoyue Xu,Aijun Cai,Xiuping Wang
A series of Fe3O4–TiO2 composites were successfully synthesized using Chlorella pyrenoidosa as a bio-template. C. pyrenoidosa is not only a promising bio-template for obtaining Fe3O4 and TiO2 nanoparticles (NPs) but is also a natural dye sensitizer source that improves the photocatalytic activity of the TiO2 NPs under visible light. The bandgap energy of Fe3O4–TiO2 is narrower than that of TiO2 due to the coupling between the Fe3O4 and TiO2 NPs. The coupling and dye-sensitization lead to the rapid separation and suppressed recombination of electron-hole pairs in Fe3O4–TiO2, which enhances the photocatalytic activity of TiO2 under visible light. The photocatalytic activity of the as-prepared composites was evaluated by degrading a rhodamine B (RhB) aqueous solution under visible-light irradiation. Fe3O4–TiO2 exhibits a high degradation efficiency for RhB, and can be withdrawn from solution easily using an external magnetic field.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·101-118
·
IF 2.064
Li Anxia,Yang Xiaoxin,Yu Binglong,Cai Xiulan
In this study, Fe 3 O 4 /nanodiamond nanocomposites (MND) were synthesized by polyglycerol-mediated covalent bonding. The horseradish peroxidase (HRP) was successfully immobilized on PG layer of MND by interaction between functional groups of MND and HRP, where the HRP molecules became tridimensionally connected outside the MND. The physicochemical properties of MND were analyzed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy measurements, vibrating sample magnetometer, Fourier transform infrared spectroscopy and zeta potential. The optimal conditions for the immobilization of HRP by MND are 7 mg/L, 35 °C and 3 h, respectively. Then, the effects of temperature, pH and storage time on the activity of immobilized enzyme and free enzyme were studied. The results showed that the relative activities of immobilized enzymes were higher than free enzymes at different temperatures, pH and storage time. In addition, the reusability experiments of immobilized enzymes showed that after six cycles, the immobilized HRP retained a relative activity of 75%. Applied to the removal of phenol, the effects of phenol concentration, H 2 O 2 /phenol molar concentration, immobilized HRP concentration and temperature on phenol removal were investigated. The results displayed that the removal efficiency of phenol reached a maximum when the phenol concentration was 75 mg/L, the ratio of H 2 O 2 to phenol was 1, the immobilized HRP concentration was 0.25 mg/L and the temperature was 30 °C. The above results indicate that the immobilized HRP exhibits high removal efficiency and has great potential for removing phenol.
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NANOTECHNOLOGY
·
2019
·Vol. 30
·期 41
·415602
·
IF 3.399
Na Wang,Min Zhang,Libin Liu,Jing Zheng,Jingli Xu,Tasawar Hayat,Njud S. Alharbi
A unique nanostructure of Fe3O4 nanoparticles (NPs)-in/carbon layer/out-Ni NPs was developed and proved to be an efficient catalyst and protein adsorbent. This kind of nanostructure was formed through a space-confined pyrolysis procedure using polydopamine-Ni2+ coated Fe-NTA nanowires as the precursor. A N-doped carbon interlayer derived from polydopamine (PDA) supported a large amount of Ni NPs and entrapped well-defined Fe3O4 NPs, which were obtained through reduction of Ni2+, Fe3+ by carbonized NTA groups and a PDA layer. The contributions of the unique configuration along with the high density of Ni NPs in Fe3O4@C-Ni are significant for improving catalysis and protein adsorption performance, which is expected to be a promising alternative to other conventional catalysts and protein adsorbents. Due to the unique novel nanostructure, this nanocomposite possesses a wide range of applications, not only for catalytic reactions but also for other inhomogeneous reactions.
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PubMed
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
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2019
·Vol. 36
·期 5
·729-739
·
IF 2.476
Pan Jiaying,Ou Zhimin,Tang Lan,Shi Hanbing
Racemic 1-phenylethylamine was resolved by enantiomer selective acetylation using Fe 3 O 4 -chitosan microsphere (CTS)-glutaraldehyde-lipase in a solvent-free system under an alternating magnetic field. Magnetic chitosan microspheres (Fe 3 O 4 -CTS) were prepared via chemical co-precipitation and cross-linked with lipase using glutaraldehyde to form Fe 3 O 4 -CTS-glutaraldehyde-lipase particles. The magnetic, physicochemical, and textural characteristics of Fe 3 O 4 -CTS-glutaraldehyde-lipase particles were assessed by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy. The optimal immobilization conditions were 2.4 mg/mL lipase, 10 mg/mL Fe 3 O 4 -CTS-glutaraldehyde, pH 8.5, 35 °C, 3 h. The loading amount of lipase and the specific activity got to 132 mg/g carrier and 48 U/g. The optimal reaction conditions of the acylation reaction using Fe 3 O 4 -CTS-glutaraldehyde-lipase were 300 mmol/L 1-phenylethylamine, 150 mg immobilized lipase, 2 mL vinyl acetate, 12.6 ×g rotating speed, 40 °C, 8 h. The activity of the Fe 3 O 4 -CTS-glutaraldehyde-lipase particles and conversion were improved when they were exposed to an external alternating magnetic field. The optimum magnetic field was 12 Gs (500 Hz). The conversion, enantiomeric excess of ( R )- N -(1-phenylethyl)acetamide, and E value reached 41.8%, 98.4%, and 264, respectively. Fe 3 O 4 -CTS-glutaraldehyde-lipase could be reused seven times. A kinetic model of the immobilized lipase-catalyzed resolution of 1-phenylethylamine was set up based on the ping-pong bi-bi mechanism. The kinetic constants were V max =1.62×10 −2 mM/min, K A =2.84×10 −4 mM, and K B =5.8×10 −1 mM. The model data fit well with the experimental data.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Yihong Jiang,Weiquan Cai,Wenjun Tu,Mengyuan Zhu
The magnetic Fe3O4@SiO2–chitosan (MFSC) with an extremely high adsorption capacity of 336.7 mg g–1 toward toxic Cr(VI) was synthesized successfully by a simple cross-link method. The physicochemical properties of the Fe3O4, Fe3O4@SiO2, and MFSC were characterized comparatively via X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, N2 adsorption–desorption, X-ray photoelectron spectroscopy analysis, and vibrating sample magnetometer. Their adsorption processes are well-fitted by the pseudo-second-order kinetic model; their equilibrium isotherms are better matched with the Langmuir isotherm. Further recycling experiments of MFSC show that its adsorption capacity of 78.6 mg g–1 still remains 81.7% of the original value (96.2 mg g–1), even after five times reuse. The interference adsorption experiments show that MFSC has stronger affinity for Cr(VI) in the solution containing Cr(VI), Cd(II), Cu(II), Zn(II), and Ni(II). The high adsorption capacity, good selectivity, and easy separation of MFSC clearly indicate that it is a potential recyclable adsorbent for Cr(VI) removal from wastewater.
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ChemElectroChem
·
2019
·Vol. 6
·期 19
·5060-5069
·
IF 3.975
Yan Nie,Hang Zhang,Jinfeng Zhang,Lei Wang,Siyu Zhong,Yinglong Wu,Junfei Duan,Huimin Shi,Kipkoech Kirui Victor,Guanhua Zhang,Huigao Duan
Graphical Don′t fill the void : A void-containing P−Fe 3 O 4 electrode derived from a phosphorization method exhibits a low lithiation/delithiation potential and high initial coulombic efficiency (80.8 % at 100 mA g −1 ) in the half-cell. The P−Fe 3 O 4 //NCM full-cell delivers a higher capacity (341 mAh g −1 ) than that of the Fe 3 O 4 //NCM full-cell (98 mAh g −1 ) in the high voltage range from 4 to 2.6 V as well as a remarkable capacity of 452 mAh g −1 at 200 mA g −1 after 50 cycles. In terms of Fe 3 O 4 -based anodes, enormous academic progress has been achieved over the past two decades; however, even with excellent half-cell performance, the relatively high lithiation potential and unsatisfactory initial coulombic efficiency (ICE) represent two major barriers to their commercial application, at present. We propose partially phosphorized Fe 3 O 4 (P−Fe 3 O 4 ) with interior void spaces induced by phosphorization to enhance the Li + storage property of Fe 3 O 4 -based anodes. P−Fe 3 O 4 anodes offer a much higher capacity at low potential compared with bare Fe 3 O 4 electrodes. Additionally, the well-designed nanostructure with preferable specific surface area prevents the initial irreversible lithium loss, which contributes to a brilliant ICE (80.8 % at 100 mA g −1 ). Moreover, in-situ X-ray diffraction proves that the formation of the Li x Fe 3 O 4 phase results from an initial intercalation process. In particular, the output voltage and energy density of P−Fe 3 O 4 full-cells are much greater than those of Fe 3 O 4 full-cells. In this work, the P−Fe 3 O 4 full-cell exhibits a capacity of 680 mAh g −1 at 200 mA g −1 as well as an excellent rate capability of 267 mAh g −1 with a current density up to 1000 mA g −1 . This study presents a new strategy to enhance Li + storage of Fe 3 O 4 enabling low lithiation/delithiation potential and high ICE, which may offer exciting opportunities toward designing high-performance full-cells with commercial cathodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Yingchao Li,Maodan Xu,Huanshun Yin,Weijie Shi,Geoffrey I.N. Waterhouse,Houshen Li,Shiyun Ai
In this study, a novel porous carbon (PC) is prepared from persimmon fruit via hydrothermal treatment at 140 °C, product freeze-drying and finally carbonization at 550 °C for 4 h under an inert atmosphere. A further porous carbon material containing magnetite nanoparticles (denoted as Fe 3 O 4 -PC) is also prepared from persimmon by introducing a microwave-assisted step into the PC synthesis. Characterization of the PC and Fe 3 O 4 -PC materials reveals that both materials have high specific surface areas and very porous structures, with the Fe 3 O 4 nanoparticles in Fe 3 O 4 -PC possessing a yolk-shell structure. The energy storage performance of the PC and Fe 3 O 4 -PC products is evaluated by assembling a supercapacitor with Fe 3 O 4 -PC as the anode and the PC as the cathode. The results suggest that the PC hold a high areal capacitance of 816.8 mF/cm 2 at 20 mV/s. The adsorption experiment also been performed to investigate the adsorption performance of prepared PC and Fe 3 O 4 -PC. The results suggest that 100% of As (V) in water and 98.3% of As (V) in mud can be removed with Fe 3 O 4 -PC as the absorbent.
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RSC Advances
·
2018
·Vol. 8
·期 13
·6887-6892
·
IF 2.936
Shanshan Li,Dongyan Li,Long Sun,Yuewei Yao,Cheng Yao
We fabricated a novel aminophenylboronic acid functionalized magnetic Fe3O4/zeolitic imidazolate framework-8/APBA (denoted as Fe3O4/ZIF-8/APBA). First, Fe3O4 was coated by zeolitic imidazolate framework-8 (denoted as Fe3O4/ZIF-8) using the hydrothermal method. Next, the phenylboronic acid functionalized triethoxysilane reagent was synthesized by 3-aminophenylboronic acid and 3-isocyanatopropyltriethoxysilane, which was modified on the surface of the Fe3O4/ZIF-8 nanocomposite through the sol–gel technique and electrostatic interaction as well as π–π stacking interaction. The synthetic Fe3O4/ZIF-8/APBA exhibited high adsorption capacity and good specificity toward glycoproteins. Moreover, the Fe3O4/ZIF-8/APBA possessed high saturation magnetization (51.41 emu g−1) and achieved better separation in the presence of an external magnetic field. Above all, the as-designed Fe3O4/ZIF-8/APBA was successfully used to capture glycoproteins and identify the horseradish peroxidase (HRP) tryptic digest. This study provides a facile strategy to embellish the aminophenylboronic acid onto the nanocomposite substrate and develop a new material for the specific recognition and enrichment of glycoproteins and low-abundance glycopeptides in proteomics research.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Wei Zhan,Jinying Du,Lingchao Kong,Jun Zhang,Wei Zuo
Efficient and selective capture of phosphate from wastewater is critical to inhibit water eutrophication and supplement phosphate sources. Adsorption, as a simple and environmental-friendly approach, can realize phosphate recovery from wastewater. In order to enhance capture efficiency, adsorption capacity and reusability, magnetic 3D Fe 3 O 4 @ZnO nanocubes with uniform active sites were tailor-designed by hydrothermal-atomic layer deposition method for phosphate removal from water under weak magnetic field (WMF). Ultrafast capture of phosphate (94.8% in 5 min) was achieved by Fe 3 O 4 @ZnO composite under WMF due to the improvement of surface area and electrostatic interaction. More importantly, the synergistic effect of Lorentz force and electrostatic attraction promoted the transfer of phosphate anions to Fe 3 O 4 @ZnO surface and pores in one step, breaking the adsorption limitation induced by intraparticle diffusion. Isotherms fitting indicated that multilayer adsorption occurred on Fe 3 O 4 @ZnO surface with superior adsorption capacity of 100.3 mg/g. Moreover, the Fe 3 O 4 @ZnO exhibited excellent selectivity competing with co-existing matters in wastewater. Mechanism exploration found that inner-sphere complexation by ligand-exchange played a major role in the adsorption process. This easily separable and recyclable adsorbent was demonstrated to be a promising candidate for efficient phosphate capture in real sewage. Also, this study provided a novel approach with WMF application in magnetic separable adsorption system for contaminants remediation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
·
IF 2.88
Le Wu,Zheng-Zhong Lin,Jun Zeng,Hui-Ping Zhong,Xiao-Mei Chen,Zhi-Yong Huang
A magnetic fluorescent probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was prepared using CdTe QDs and Fe 3 O 4 nanoparticles as co -nucleus and molecularly imprinted polymers (MIPs) as specific recognition sites based on a reverse microemulsion method. With the specific enrichment and magnetic separation properties, the probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was used to detect malachite green (MG) in fish samples. The TEM analysis showed that the particles of CdTe QDs/nano-Fe 3 O 4 @MIPs were spherical with average diameter around 53 nm, and a core-shell structure was well-shaped with several Fe 3 O 4 nanoparticles and CdTe QDs embedded in each of the microsphere . Quick separation of the probes from solutions could be realized with a magnet, indicating the excellent magnetic property of CdTe QDs/nano-Fe 3 O 4 @MIPs. The probe exhibited high specific adsorption towards MG and excellent fluorescence emission at λ em 598 nm. The fluorescence of CdTe QDs/nano-Fe 3 O 4 @MIPs could be linearly quenched by MG at the concentrations from 0.025 to 1.5 μmol L −1 . The detection limit was 0.014 μmol L −1 . The average recovery of spiked MG in fish samples was 105.2%. The result demonstrated that the as-prepared CdTe QDs/nano-Fe 3 O 4 @MIPs could be used as a probe to the detection of trace MG in fish samples.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Jiandong Cui,Sizhu Ren,Tao Lin,Yuxiao Feng,Shiru Jia
Enzyme immobilization on solid supports is a valuable approach to address enzyme stability and reuse for continuous operations. However, the enzymes immobilized on the external surface of solid supports may not be protected by carriers and suffer inactivation caused by denaturing stresses and hazard external environment. Herein, we describe for the first time a enzyme-shielding strategy to prepare hybrid organic/inorganic nanobiocatalysts; it exploits the self-assembly of supramolecular metal-organic coordination complex (tannic acid (TA) and Fe 3+ ) at the surface of immobilized catalase on Fe 3 O 4 /silica core-shell nanospheres to grow a protective nanocoating (Fe 3+ -TA nanocoating). The nanocoatings around the immobilized catalase (Fe 3+ -TA@Fe 3 O 4 /SiO 2 -catalase) provide a “shield effect” to protect from biological, thermal and chemical degradation for enzyme. As a result, the stability of immobilized catalase against proteolytic agent, denaturants and heat were improved remarkably compared to the immobilized catalase without a protective nanocoating and free catalase. More importantly, the recycling of the immobilized catalase was improved remarkably. The Fe 3+ -TA@Fe 3 O 4 /SiO 2 -catalase still retained 55% of their original activity after 9 cycles, whereas the immobilized catalase without a protective nanocoating only retained 20% of original activity. These results demonstrated that the novel enzyme-shielding strategy is an efficient method to obtain stable and recycled biocatalyst with yolk-shell structure.
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Journal of Saudi Chemical Society
·
2018
·
IF 2.456
Bingzhen Li,Xiaodi Weng,Xiaodong Sun,Yang Zhang,Xuliang Lv,Guangxin Gu
In this paper, ternary nanocomposites of Fe 3 O 4 /reduced graphene oxide/polyvinyl pyrrolidone (Fe 3 O 4 /rGO/PVP) as a novel type of electromagnetic microwave absorbing materials were synthesized by a three-step chemical approach. First, Fe 3 O 4 nanospheres were made by solvent thermal method. Successively, the Fe 3 O 4 particles were assembled with rGO after having activated by para -aminobenzoic acid. PVP grafting and reduction of GO happened simultaneously in the third step. It is found that the electromagnetic absorption (EA) performance of synthesized ternary composites with suitable PVP amount had been significantly enhanced comparing to Fe 3 O 4 and Fe 3 O 4 /rGO. Merely 15 wt% low loading in paraffin and thin as 2.8 mm can reach effective EA bandwidth (below −10 Db) of 11.2 GHz, and the highest reflection loss reached −67 dB at 10.7 GHz. It was demonstrated that these composites show an effective route to novel microwave absorbing material design.
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危险品化学品经营许可证（带存储）