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Static magnetic field-assisted synthesis of Fe3O4 nanoparticles and their adsorption of Mn(Ⅱ) in aqueous solution 被引量:2
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作者 Yong Liu Jianfei Bai +1 位作者 Hongtao Duan Xiaohong Yin 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第1期32-36,共5页
A facile method for synthesis of the magnetic Fe_3O_4 nanoparticles was introduced.Magnetic nanoparticles were prepared via co-precipitation method with(PMF) and without(AMF) 0.15 T static magnetic field.The effects o... A facile method for synthesis of the magnetic Fe_3O_4 nanoparticles was introduced.Magnetic nanoparticles were prepared via co-precipitation method with(PMF) and without(AMF) 0.15 T static magnetic field.The effects of magnetic field on the properties of magnetic nanoparticles were studied by XRD,TEM,SEM,VSM and BET.The results showed that the magnetic field in the co-precipitation reaction process did not result in the phase change of the Fe_3O_4 nanoparticles but improved the crystallinity.The morphology of Fe_3O_4 nanoparticles was varied from random spherical particles to rod-like cluster structure.The VSM results indicated that the saturation magnetization value of the Fe_3O_4 nanoparticles was significantly improved by the magnetic field.The BET of Fe_3O_4nanoparticles prepared with the magnetic field was larger than the control by 23.5%.The batch adsorption experiments of Mn(Ⅱ) on the PMF and AMF Fe_3O_4 nanoparticles showed that the Mn(II) equilibrium capacity was increased with the pH value increased.At pH 8,the Mn(Ⅱ) adsorption capacity for the PMF and AMF Fe_3O_4 was reached at 36.81 and 28.36 mg·g^(-1),respectively.The pseudo-second-order model fitted better the kinetic models and the Freundlich model fitted isotherm model well for both PMF and AMF Fe_3O_4.The results suggested that magnetic nanoparticles prepared by the magnetic field presented a fairly good potential as an adsorbent for an efficient removal of Mn(Ⅱ) from aqueous solution. 展开更多
关键词 magnetic field fe3o4 nanoparticles Mn(Ⅱ) Adsorption
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Intensification of levofloxacin sono-degradation in a US/H_2O_2 system with Fe_3O_4 magnetic nanoparticles 被引量:2
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作者 魏红 胡妲 +1 位作者 苏洁 李克斌 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第1期296-302,共7页
Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale... Fe3O4 magnetic nanoparticles(MNPs) were synthesised, characterised, and used as a peroxidase mimetic to accelerate levofloxacin sono-degradation in an ultrasound(US)/H2O2 system. The Fe3O4 MNPs were in nanometre scale with an average diameter of approximately 12 to 18 nm. The introduction of Fe3O4 MNPs increased levofloxacin sono-degradation in the US/H2O2 system. Experimental parameters, such as Fe3O4 MNP dose, initial solution p H, and H2O2 concentration, were investigated by a one-factor-at-a-time approach. The results showed that Fe3O4 MNPs enhanced levofloxacin removal in the p H range from 4.0 to 9.0. Levofloxacin removal ratio increased with Fe3O4 MNP dose up to 1.0 g·L-1and with H2O2 concentration until reaching the maximum. Moreover, three main intermediate compounds were identified by HPLC with electrospray ionisation tandem mass spectrometry, and a possible degradation pathway was proposed. This study suggests that combination of H2O2, Fe3O4 MNPs and US is a good way to improve the degradation efficiency of antibiotics. 展开更多
关键词 fe3o4 magnetic nanoparticles H2O2 LEVOFLOXACIN SONOLYSIS HPLC/MS/MS Degradation pathway
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Modification of Fe_3O_4 Magnetic Nanoparticles by L-dopa or Dopamine as an Enzyme Support 被引量:1
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作者 PENG Hong ZHANG Xiao HUANG Kaixun XU Huibi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第4期480-485,共6页
Fe3O4 magnetic nanoparticles were prepared by co-precipitation of Fe^2+ and Fe^3+ in an ammonia solution, and its size was about 36 nm measured by an atomic force microscope. Fe3O4 magnetic nanoparticles were modifi... Fe3O4 magnetic nanoparticles were prepared by co-precipitation of Fe^2+ and Fe^3+ in an ammonia solution, and its size was about 36 nm measured by an atomic force microscope. Fe3O4 magnetic nanoparticles were modified by L-dopa or dopamine using sonication method. The analysis of FTIR clearly indicated the formation of Fe-O-C bond. Direct immobilization of trypsin (EC: 3.4.21.4) on Fe3O4 magnetic nanoparticles with L-dopa and dopamine spacer was investigated using glutaraldehyde as a coupling agent. No significant changes in the size and magnetic property of the three kinds of magnetic nanoparticles linked with or without trypsin were observed. The existence of the spacer molecule on magnetic nanoparticles could greatly improve the activity and the storage stability of bound trypsin through increasing the flexibility of enzyme and changing the microenvironment on nanoparticles surface compared to the naked magnetic nanoparticles. 展开更多
关键词 fe3o4 magnetic nanoparticles MODIFICATION TRYPSIN IMMOBILIZATION L-DOPA DOPAMINE
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Controllable Synthesis and Magnetic Properties of Monodisperse Fe_3O_4 Nanoparticles
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作者 王朱良 马慧 +3 位作者 王芳 李敏 张利国 许小红 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第10期107-111,共5页
Magnetite (Fe3O4) nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the g... Magnetite (Fe3O4) nanoparticles with different sizes and shapes are synthesized by the thermal decomposition method. Two approaches, non-injection one-pot and hot-injection methods, are designed to investigate the growth mechanism in detail. It is found that the size and shape of nanoparticles are determined by adjusting the precursor concentration and duration time, which can be well explained by the mechanism based on the LaMer model in our synthetic system. The monodisperse Fe3O4 nanoparticles have a mean diameter from 5nm to 16nm, and shape evolution from spherical to triangular and cubic. The magnetic properties are size-dependent, and Fe3O4 nanoparticles in small size about 5 nm exhibit superparamagnetie properties at room temperature and maximum saturation magnetization approaches to 78 emu/g, whereas Fe3O4 nanoparticles develop ferromagnetic properties when the diameter increases to about 16nm. 展开更多
关键词 FE acac in IS on of Controllable Synthesis and magnetic Properties of Monodisperse fe3o4 nanoparticles
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Synthesis and characterization of Fe_3O_4 magnetic nanoparticles and their heating effects under radiofrequency capacitive field
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作者 李旭红 冯志明 +3 位作者 欧阳伟炜 谢小雪 廖遇平 唐劲天 《Journal of Central South University》 SCIE EI CAS 2010年第6期1185-1189,共5页
Fe3O4 magnetic nanoparticles with diameters varying from 10 to 426 nm were synthesized and characterized.Heating effects of Fe3O4 magnetic nanoparticles under radiofrequency capacitive field(RCF) with frequency of 27.... Fe3O4 magnetic nanoparticles with diameters varying from 10 to 426 nm were synthesized and characterized.Heating effects of Fe3O4 magnetic nanoparticles under radiofrequency capacitive field(RCF) with frequency of 27.12 MHz and power of 60-150 W were investigated.When the power of RCF is lower than 90 W,temperatures of Fe3O4 magnetic nanoparticles(75-150 mg/mL) can be raised and maximal temperatures are all lower than 50 ℃.When the power of RCF is 90-150 W,temperatures of Fe3O4 magnetic nanoparticles can be quickly raised and are all obviously higher than those of normal saline and distilled water under the same conditions.Temperature of Fe3O4 magnetic nanoparticles can even reach 70.2 ℃ under 150 W RCF.Heating effects of Fe3O4 magnetic nanoparticles are related to RCF power,particle size and particle concentration. 展开更多
关键词 fe3o4 magnetic nanoparticles radiofrequency capacitive field SYNTHESIS characterization heating effects
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Magnetic CuO nanoparticles supported on graphene oxide as an efficient catalyst for A^3-coupling synthesis of propargylamines 被引量:2
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作者 Maryam Mirabedini Elaheh Motamedi Mohammad Zaman Kassaee 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第9期1085-1090,共6页
Magnetically separable CuO nanoparticles supported on graphene oxide(Fe3O4 NPs/GO-CuO NPs) is synthesized and characterized for the preparation of propargylamines in EtOH,at 90 C.Fe3O4 NPs/GOCuO NPs is found to be a... Magnetically separable CuO nanoparticles supported on graphene oxide(Fe3O4 NPs/GO-CuO NPs) is synthesized and characterized for the preparation of propargylamines in EtOH,at 90 C.Fe3O4 NPs/GOCuO NPs is found to be an efficient catalyst for the A^3-coupling of aldehydes,amines,and alkynes through C-H activation.Both aromatic and aliphatic aldehydes and alkynes are combined with secondary amines to provide a wide range of propargylamines in moderate to excellent yields. 展开更多
关键词 CuO Graphene oxide fe3o4 A^3-coupling Nano-catalyst magnetic nanoparticles
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