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Synthesis and Characterization of Superparamagnetic Fe3O4@SiO2Core-Shell Composite Nanoparticles 认领 引用 被引量：4
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作者 Meizhen Gao Wen Li +2 位作者 Jingwei Dong Zhirong Zhang Bingjun Yang 《World Journal of Condensed Matter Physics》 CAS 2011年第2期49-54,共6页
The Fe3O4@SiO2 composite nanoparticles were obtained from as-synthesized magnetite (Fe3O4) nanoparticles through the modified St?ber method. Then, the Fe3O4 nanoparticles and Fe3O4@SiO2 composite nanoparticles were ch... The Fe3O4@SiO2 composite nanoparticles were obtained from as-synthesized magnetite (Fe3O4) nanoparticles through the modified St?ber method. Then, the Fe3O4 nanoparticles and Fe3O4@SiO2 composite nanoparticles were characterized by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). Recently, the studies focus on how to improve the dispersion of composite particle and achieve good magnetic performance. Hence effects of the volume ratio of tetraethyl orthosilicate (TEOS) and magnetite colloid on the structural, morphological and magnetic properties of the composite nanoparticles were systematically investi-gated. The results revealed that the Fe3O4@SiO2 had better thermal stability and dispersion than the magnetite nanoparticles. Furthermore, the particle size and magnetic property of the Fe3O4@SiO2 composite nanoparticles can be adjusted by changing the volume ratio of TEOS and magnetite colloid. 展开更多
关键词 Magnetite Nanoparticles Fe3O4@SiO2 Composite Nanoparticles Dispersion Thermal Stability Particle Size Magnetic Property
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Preparation and characterization of cross-linked β-cyclodextrin polymer/Fe_3O_4 composite nanoparticles with core-shell structures 认领 引用 被引量：7
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作者 Rui Xue Li Shu Mei Liu +2 位作者 Jian Qing Zhao Hideyuki Otsuka Atsushi Takahara 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第2期217-220,共4页
Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparti... Cross-linkedβ-cyclodextrin polymer/Fe3O4 composite nanoparticles with core-shell structures were prepared via cross linking reaction on the surface of carboxymethylβ-cyclodextrin（CM-β-CD） modified Fe3O4 nanoparticles inβ-cyclodextrin alkaline solution by using epichlorohydrin as crosslinking agent.The morphology,structure and magnetic properties of the prepared composite nanoparticles were investigated by transmission electron microscopy（TEM）,Fourier transform infrared（FTIR） spectrometry,X-ray diffraction（XRD） measurement,thermogravimetric analysis（TGA） and Vibrating sample magnetometry （VSM）,respectively. 展开更多
关键词 Cross-linkedβ-cyclodextrin polymer Fe3O4 nanoparticles Composite nanoparticles Core-shell structures
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Absorption performance of DMSA modified Fe_3O_4@SiO_2 core/shell magnetic nanocomposite for Pb2+ removal 认领 引用 被引量：9
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作者 TIAN Qing-hua WANG Xiao-yang +1 位作者 MAO Fang-fang GUO Xue-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第4期709-718,共10页
The purpose of this study is to explore the adsorption performance of meso-2,3-dimercaptosuccinic acid(DMSA)modified Fe3O4@SiO2 magnetic nanocomposite(Fe3O4@SiO2@DMSA)for Pb2+ions removal from aqueous solutions.The ef... The purpose of this study is to explore the adsorption performance of meso-2,3-dimercaptosuccinic acid(DMSA)modified Fe3O4@SiO2 magnetic nanocomposite(Fe3O4@SiO2@DMSA)for Pb2+ions removal from aqueous solutions.The effects of solution pH,initial concentration of Pb2+ions,contact time,and temperature on the amount of Pb2+adsorbed were investigated.Adsorption isotherms,adsorption kinetics,and thermodynamic analysis were also studied.The results showed that the maximum adsorption capacity of the Fe3O4@SiO2@DMSA composite is 50.5 mg/g at 298 K,which is higher than that of Fe3O4 and Fe3O4@SiO2 magnetic nanoparticles.The adsorption process agreed well with Langmuir adsorption isotherm models and pseudo second-order kinetics.The thermodynamic analysis revealed that the adsorption was spontaneous,endothermic and energetically driven in nature. 展开更多
关键词 lead removal adsorption Fe3O4@SiO2 core/shell structure DMSA modification magnetic nanocomposite
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Synthesis of Fe_3O_4@SiO_2-Au/Cu magnetic nanoparticles and its efficient catalytic performance for the Ullmann coupling reaction of bromamine acid 认领 引用 被引量：2
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作者 Aiqin Gao Hui Liu +3 位作者 Liu Hu Hongjuan Zhang Aiqin Hou Kongliang Xie 《Chinese Chemical Letters》 SCIE CAS CSCD 2018年第8期1301-1304,共4页
Novel magnetic core/shell bimetallic Au/Cu nanoparticles（Fe_3O_4@SiO_2-Au/Cu NPs） were prepared using SiO_2-coated iron oxide（Fe_3O_4@SiO_2） as a supported material. The magnetic Fe_3O_4 colloidal nanocrystal clus... Novel magnetic core/shell bimetallic Au/Cu nanoparticles（Fe_3O_4@SiO_2-Au/Cu NPs） were prepared using SiO_2-coated iron oxide（Fe_3O_4@SiO_2） as a supported material. The magnetic Fe_3O_4 colloidal nanocrystal clusters（CNCs） as nano-core were modified with a silica coating for improvement stability and superficial area of the Au-Cu particles. The morphological structure and chemical composition of the Fe_3O_4@SiO_2-Au/Cu NPs were characterized with high-resolution transmission electron microscopy（HRTEM）, energy-dispersive X-ray（EDX） and X-ray photoelectron spectroscopy（XPS） analyses. The Au and Cu NPs were deposited on the SiO_2 surface in a highly dense and well dispersed manner with an average size of approximately 5 nm. The Fe_3O_4@SiO_2-Au/Cu NPs as magnetic nano-catalysts were applied to the Ullmann coupling reaction of bromamine acid to synthesize 4,40-diamino-1,10-dianthraquinonyl-3,30-disulfonic acid（DAS）. The prepared Fe_3O_4@SiO_2-Au/Cu NPs exhibited efficient catalytic activity with higher conversion and selectivity. A bromamine acid conversion of 97.35% and selectivity for DAS of 88.67% were obtained in aqueous medium. The magnetic nano-catalysts can be readily separated from the reaction system and reused. This new nano-catalytic reaction represents a useful and attractive cleaner production system. The new catalyst system has important and potential applications in dye and pigment industry. 展开更多
关键词 Dye synthesis Nano-catalyst Fe3O4@SiO2-Au/Cu NPs Magnetic separation Ullmann coupling reaction Recyclability
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Intensification of levofloxacin sono-degradation in a US/H_2O_2 system with Fe_3O_4 magnetic nanoparticles 认领 引用 被引量：6
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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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Fabrication and Magnetic Properties of Composite Ni0.5Zn0.5Fe_2O_4/Pb(Zr0.52Ti0.48)O_3 Nanofibers by Electrospinning 认领 引用 被引量：1
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作者 SHEN Xiangqian ZHENG Jincai +1 位作者 MENG Xianfeng LlANG Qingrong 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2011年第3期384-387,共4页
One-dimensional and quasi-one-dimensional nanostructure materials are promising building blocks for electromagnetic devices and nanosystems.In this work,the composite Ni0.5Zn0.5Fe2O4(NZFO)/Pb(Zr0.52Ti0.48)O3(PZT)nanof... One-dimensional and quasi-one-dimensional nanostructure materials are promising building blocks for electromagnetic devices and nanosystems.In this work,the composite Ni0.5Zn0.5Fe2O4(NZFO)/Pb(Zr0.52Ti0.48)O3(PZT)nanofibers with average diameters about 65 nm are prepared by electrospinning from poly(vinyl pyrrolidone)(PVP)and metal salts.The precursor composite NZFO/PZT/PVP nanofibers and the subsequent calcined NZFO/PZT nanofibers are investigated by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),scanning electron microscopy(SEM).The magnetic properties for nanofibers are measured by vibrating sample magnetometer(VSM).The NZFO/PZT nanofibers obtained at calcination temperature of 900°C for 2 h consist of the ferromagnetic spinel NZFO and ferroelectric perovskite PZT phases,which are constructed from about 37 nm NZFO and 17 nm PZT grains.The saturation magnetization of these NZFO/PZT nanofibers increases with increasing calcination temperature and contents of NZFO in the composite. 展开更多
关键词 nanofiber Ni0.5Zn0.5Fe2O4 Pb(Zr0.52Ti0.48)O3 composite electrospinning
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A highly selective magnetic sensor with functionalized Fe/Fe_3O_4 nanoparticles for detection of Pb2+ 认领 引用 被引量：3
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作者 Yan Yang Yang Zhang +3 位作者 Jin-Chao Shen Hong Yang Zhi-Guo Zhou Shi-Ping Yang 《Chinese Chemical Letters》 SCIE CAS CSCD 2016年第6期891-895,共5页
A magnetic sensor for detection of Pb^2＋ has been developed based on Fe/Fe3O4 nanoparticles modified by3-（3,4-dihydroxyphenyl）propionic acid（DHCA）. The carboxyl groups of DHCA have a strong affinity to coordinati... A magnetic sensor for detection of Pb^2＋ has been developed based on Fe/Fe3O4 nanoparticles modified by3-（3,4-dihydroxyphenyl）propionic acid（DHCA）. The carboxyl groups of DHCA have a strong affinity to coordination behavior of Pb^2＋ thus inducing the transformation of Fe/Fe3O4 nanoparticles from a dispersed to an aggregated state with a corresponding decrease, then increase in transverse relaxation time（T2） of the surrounding water protons. Upon addition of the different concentrations of Pb^2＋ to an aq. solution of DHCA functionalized Fe/Fe3O4 nanoparticles（DHCA-Fe/Fe3O4 NPs）（[Fe] = 90 mmol/L）, the change of T2 values display a good linear relationship with the concentration of Pb^2＋ from 40 μmol/L to 100 μmol/L and from 130 μmol/L to 200 μmol/L, respectively. Owing to the especially strong interaction between DHCA and Pb^2＋, DHCA-Fe/Fe3O4 NPs exhibited a high selectivity over other metal ions. 展开更多
关键词 Magnetic sensor Fe/Fe3O4 nanoparticles Pb2＋
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Co-adsorption of gaseous benzene, toluene, ethylbenzene,m-xylene(BTEX) and SO_2 on recyclable Fe_3O_4 nanoparticles at 0–101% relative humidities 认领 引用 被引量：2
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作者 Connie Z.Ye Parisa A.Ariya 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2015年第5期164-174,共11页
We herein used Fe3O4 nanoparticles（NPs） as an adsorption interface for the concurrent removal of gaseous benzene, toluene, ethylbenzene and m-xylene（BTEX） and sulfur dioxide（SO2）, at different relative humiditie... We herein used Fe3O4 nanoparticles（NPs） as an adsorption interface for the concurrent removal of gaseous benzene, toluene, ethylbenzene and m-xylene（BTEX） and sulfur dioxide（SO2）, at different relative humidities（RH）. X-ray diffraction, Brunauer-Emmett-Teller, and transmission electron microscopy were deployed for nanoparticle surface characterization.Mono-dispersed Fe3O4（Fe2O3·Fe O） NPs synthesized with oleic acid（OA） as surfactant, and uncoated poly-dispersed Fe3O4 NPs demonstrated comparable removal efficiencies.Adsorption experiments of BTEX on NPs were measured using gas chromatography equipped with flame ionization detection, which indicated high removal efficiencies（up to（95 ± 2）%） under dry conditions. The humidity effect and competitive adsorption were investigated using toluene as a model compound. It was observed that the removal efficiencies decreased as a function of the increase in RH, yet, under our experimental conditions, we observed（40 ± 4）% toluene removal at supersaturation for Fe3O4 NPs, and toluene removal of（83 ± 4）% to（59 ± 6）%, for OA-Fe3O4 NPs. In the presence of SO2, the toluene uptake was reduced under dry conditions to（89 ± 2）% and（75 ± 1）% for the uncoated and coated NPs, respectively, depicting competitive adsorption. At RH 〉 100%,competitive adsorption reduced the removal efficiency to（27 ± 1）% for uncoated NPs whereas OA-Fe3O4 NPs exhibited moderate efficiency loss of（55 ± 2）% at supersaturation.Results point to heterogeneous water coverage on the NP surface. The magnetic property of magnetite facilitated the recovery of both types of NPs, without the loss in efficiency when recycled and reused. 展开更多
关键词 Fe3O4 nanoparticles Co-adsorption Competitive adsorption BTEX removal SO2 removal
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磁性Fe_3O_4@SiO_2@CS镉离子印迹聚合物的制备及吸附性能 认领 引用 被引量：12
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作者 张明磊 张朝晖 +3 位作者 罗丽娟 杨潇 刘玉楠 聂利华 《高等学校化学学报》 SCIE CAS CSCD 北大核心 2011年第12期2763-2768,共6页
以SiO2包覆的纳米Fe3O4为载体,壳聚糖(Chitosan,CS)为功能配体,γ-缩水甘油醚氧丙基三甲氧基硅烷为交联剂,制备了磁性Fe3O4@SiO2@CS镉离子印迹聚合物(Magnetic ion-imprinted polymer,M-IIP).采用扫描电镜和红外光谱对该磁性印迹聚合物... 以SiO2包覆的纳米Fe3O4为载体,壳聚糖(Chitosan,CS)为功能配体,γ-缩水甘油醚氧丙基三甲氧基硅烷为交联剂,制备了磁性Fe3O4@SiO2@CS镉离子印迹聚合物(Magnetic ion-imprinted polymer,M-IIP).采用扫描电镜和红外光谱对该磁性印迹聚合物进行了表征.结果表明,壳聚糖在环氧基硅烷交联作用下,实现了印迹壳层在磁性Fe3O4表面的接枝,该印迹材料是边长为60～120 nm的立方体.吸附性能实验表明,M-IIP对Cd(Ⅱ)的吸附符合一级动力学吸附模型;M-IIP对Cd(Ⅱ)/Cu(Ⅱ),Cd(Ⅱ)/Zn(Ⅱ),Cd(Ⅱ)/Pb(Ⅱ)和Cd(Ⅱ)/Hg(Ⅱ)的相对选择系数分别为2.92,3.43,8.97和9.20.原子吸收光谱检测结果表明,该磁性Fe3O4@SiO2@CS离子印迹聚合物可用于水溶液中Cd(Ⅱ)的分离,Cd(Ⅱ)回收率在98%以上. 展开更多
关键词 核壳型 Fe3O4@SiO2@CS 磁性印迹聚合物 镉离子
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超声合成Fe3O4@SiO2复合纳米磁性粒子用于质粒DNA的提纯 认领 引用 被引量：11
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作者 王显祥 王森 +1 位作者 杨婉身 单志 《化学学报》 SCIE CAS 北大核心 2009年第1期54-58,共5页
用超声合成了Fe3O4@SiO2复合纳米磁性粒子,并用于质粒DNA的提取.用透射电镜(TEM)、红外光谱(FT-IR)、震动样品磁场计(VSM)、X光电子能谱仪(XPS)等方法对合成的复合磁性粒子的表面形貌、结构、磁性质等进行了表征,合成的复合磁微粒粒径... 用超声合成了Fe3O4@SiO2复合纳米磁性粒子,并用于质粒DNA的提取.用透射电镜(TEM)、红外光谱(FT-IR)、震动样品磁场计(VSM)、X光电子能谱仪(XPS)等方法对合成的复合磁性粒子的表面形貌、结构、磁性质等进行了表征,合成的复合磁微粒粒径分布均匀,在15～20nm,磁响应性好.用该复合磁微粒提取DNA的纯度能达到A260/A280=1.8±0.1,琼脂糖电泳证明质粒DNA结构基本没有被破坏,主要为超螺旋结构,能满足PCR等后续分子生物学操作的要求. 展开更多
关键词 复合纳米磁性粒子 超声 Fe3O4@SiO2 DNA 提取
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Fe_3O_4@SiO_2-NH_2磁性复合材料对水中单宁酸的吸附性能研究 认领 引用 被引量：12
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作者 王雪 孟令友 +1 位作者 代莹 邹金龙 《环境科学学报》 CAS CSCD 北大核心 2013年第8期2193-2198,共6页
通过简单方法制备出Fe3O4@SiO2-NH2磁性复合材料,并利用XRD、FT-IR、VSM和SEM等手段对其物理化学性质进行了表征,最后对水中单宁酸进行了吸附性能研究.结果表明,所制备复合材料上的氨基基团(N—H的特征吸收峰出现在1549.53cm-1)能够与... 通过简单方法制备出Fe3O4@SiO2-NH2磁性复合材料,并利用XRD、FT-IR、VSM和SEM等手段对其物理化学性质进行了表征,最后对水中单宁酸进行了吸附性能研究.结果表明,所制备复合材料上的氨基基团(N—H的特征吸收峰出现在1549.53cm-1)能够与单宁酸上的酚羟基反应,使—NH2质子化形成NH+3,并利用良好的磁性(42.5emu.g-1)使单宁酸从水中分离去除;对单宁酸的吸附符合Langmuir吸附模型和拟二级吸附动力学方程;在pH=6时,基于氢键和静电吸附的协同作用,吸附能力达到最强,为85.18mg.g-1(吸附温度为25℃,吸附时间为60min).研究证实,Fe3O4@SiO2-NH2磁性复合材料与Fe3O4@SiO2和SiO2相比,对单宁酸有更好的吸附性能,同时通过外磁场可以达到固液分离的效果. 展开更多
关键词 Fe3O4@SiO2-NH2 单宁酸 水污染 吸附
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Fe_3O_4@SiO_2磁性纳米粒子的制备及表征 认领 引用 被引量：15
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作者 杜雪岩 马芬 +1 位作者 李芳 徐凯 《兰州理工大学学报》 CAS 北大核心 2011年第2期22-25,共4页
用多元醇还原法制备出平均粒径为6.0nm的Fe3O4磁性纳米粒子,并用盐酸溶液(1mol/L)对其进行酸化处理,然后利用反相微乳液法,在OP-10/正丁醇/环己烷/浓氨水反相微乳体系中制备出Fe3O4@SiO2磁性纳米复合粒子.利用X射线衍射(XRD)仪,透射电... 用多元醇还原法制备出平均粒径为6.0nm的Fe3O4磁性纳米粒子,并用盐酸溶液(1mol/L)对其进行酸化处理,然后利用反相微乳液法,在OP-10/正丁醇/环己烷/浓氨水反相微乳体系中制备出Fe3O4@SiO2磁性纳米复合粒子.利用X射线衍射(XRD)仪,透射电子显微镜(TEM),傅立叶-红外光谱仪(FT-IR)和振动样品磁强计(VSM)对复合粒子进行表征.结果表明:SiO2成功包覆在Fe3O4磁性纳米粒子表面,制得的复合粒子平均粒径为25.0nm,呈球形且分散均匀,包覆后饱和磁化强度有所下降,但矫顽力仍趋近于零,显示超顺磁性. 展开更多
关键词 反相微乳液 Fe3O4纳米粒子 Fe3O4@SiO2复合粒子
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Preparation and photocatalytic activity of Fe3O4@SiO2@ZnO:La 认领 引用 被引量：5
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作者 Xiaowei Lv Wenyi Huang +6 位作者 Xingcheng Ding Jiangwei He Qiumei Huang Jialin Tan Hao Cheng Jun Feng Lijun Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2020年第12期1288-1296,共9页
In this study,Fe3 O4@SiO2@ZnO:La microspheres were successfully prepared.The microspheres have the advantages of both ZnO doped with La and the Fe3 O4@SiO2 structure such that the former improves the photocatalytic ac... In this study,Fe3 O4@SiO2@ZnO:La microspheres were successfully prepared.The microspheres have the advantages of both ZnO doped with La and the Fe3 O4@SiO2 structure such that the former improves the photocatalytic activity of ZnO and the latter can be reused.The X-ray diffraction(XRD),a field emission scanning electron microscope(SEM),a field emission transmission electron microscope(TEM),X-ray photoelectron spectroscopy(XPS),and a vibrating sample magnetometer(VSM)were used to characterize Fe3 O4@SiO2@ZnO:La microspheres.Methyl orange was used as the model molecule to study the effect of the Zn2+concentration and the doping amount of La on the photocatalytic activity of Fe3 O4@SiO2@ZnO:La microspheres.Results show that in the synthesis of Fe3 O4@SiO2@ZnO:La microspheres,photocatalytic activity of the microspheres is enhanced first and weakened later with the increase of Zn2+concentration.In the La doping process,the photocatalytic activity of Fe3 O4@SiO2@ZnO:La microspheres is enhanced with the increase in the La doping amount.The magnetic photocatalysts not only have high photocatalytic activity,but also can be reused.After being reused five times,the photocatalyst’s degradation rate of methyl orange is still as high as 81%,which shows that magnetic photocatalysts have prospective wider applications in photocatalytic degradation of dye wastewater. 展开更多
关键词 Fe3O4@SiO2 ZnO:La Photocatalysis Reuse Rare earths
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Fe_3O_4@SiO_2-NH_2磁性复合材料对水中全氟化合物的检测研究 认领 引用 被引量：8
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作者 聂阳 王永花 +2 位作者 胡良锋 洪诚 陆光华 《分析测试学报》 CAS CSCD 北大核心 2016年第1期1-7,共7页
利用三步法（热溶剂还原法,硅烷化和氨基功能化）制备了Fe3O4@SiO2-NH2磁性纳米复合材料用于水体中全氟化合物的萃取,结合超高效液相色谱-串联三重四极杆质谱（UPLC-MS/MS）技术,建立了水体中7种典型全氟化合物的检测方法。通过扫描电镜... 利用三步法（热溶剂还原法,硅烷化和氨基功能化）制备了Fe3O4@SiO2-NH2磁性纳米复合材料用于水体中全氟化合物的萃取,结合超高效液相色谱-串联三重四极杆质谱（UPLC-MS/MS）技术,建立了水体中7种典型全氟化合物的检测方法。通过扫描电镜（SEM）、透射电镜（TEM）和傅立叶红外光谱（FT-IR）等手段对材料进行表征,详细研究了解析溶剂、解析溶剂体积、解析时间、吸附时间和p H值等因素对萃取效率的影响。结果表明：氨基被成功修饰在Fe3O4@SiO2纳米粒子的表面,Fe3O4@SiO2-NH2磁性纳米材料对目标全氟化合物有较好的萃取效果,在萃取时间为20 min,解析溶剂为3 m L×4含0.28%氨水的甲醇,解析时间为5 min,p H 5.0时,萃取效率最佳。在最优实验条件下,全氟化合物的检出限为0.2~0.5 ng/L,线性范围为1~500 ng/L。方法用于实际水体中目标全氟化合物的检测,样品的加标回收率不低于82.0%。 展开更多
关键词 Fe3O4@SiO2-NH2 全氟化合物 超高效液相色谱-串联质谱 环境水样
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Fe_3O_4@SiO_2@mTiO_2介孔多功能纳米复合颗粒的制备及载药能力 认领 引用 被引量：4
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作者 彭红霞 胡传跃 +2 位作者 吴腾宴 胡继林 田修营 《无机化学学报》 SCIE CAS CSCD 北大核心 2016年第7期1154-1160,共7页
以溶剂热法制备氨基功能化的Fe_3O_4纳米颗粒为磁核,结合溶胶-凝胶法和模板法在其表面先后包覆上致密的SiO_2层和介孔TiO_2层,制备了磁性-发光-微波热转换性-介孔结构为一体的多功能核-壳结构纳米复合颗粒,并对其结构、性能及载药能力... 以溶剂热法制备氨基功能化的Fe_3O_4纳米颗粒为磁核,结合溶胶-凝胶法和模板法在其表面先后包覆上致密的SiO_2层和介孔TiO_2层,制备了磁性-发光-微波热转换性-介孔结构为一体的多功能核-壳结构纳米复合颗粒,并对其结构、性能及载药能力进行了研究。XRD分析表明:Fe_3O_4表面包覆上了无定形结构的SiO_2和TiO_2。TEM照片表明:所得的纳米复合颗粒具有明显的核壳结构和完美的球形,构成核的Fe_3O_4颗粒的尺寸在40~50 nm之间,Fe_3O_4@SiO_2@mTiO_2核壳结构纳米复合颗粒的尺寸为60~70 nm,壳层厚度约10 nm,并可观察到壳层中清晰的孔状结构。磁性、荧光光谱和微波热转换特性分析表明:该复合颗粒同时具有良好的发光性、磁性和微波热转换特性。N_2气吸附及药物负载率分析表明,该复合颗粒具有较高的比表面积(640 m^2·g-1)和介孔结构(孔径约2.8 nm)并且具有较高的药物负载率。 展开更多
关键词 Fe3O4@SiO2@mTiO2 介孔 磁性 荧光性 微波热转换性 药物负载
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Fe_3O_4@SiO_2-CHO共价固定脂肪酶条件的响应面优化及固定化酶催化生产生物柴油 认领 引用 被引量：5
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作者 马晓瑞 秦家亮 +4 位作者 吴海珍 许毅 曹瑜 乔代蓉 曹毅 《应用与环境生物学报》 CAS CSCD 北大核心 2017年第2期256-263,共8页
生物柴油是一种可再生且环保的化石燃料的替代品,研究固定化酶生产生物柴油对解决石化燃料耗尽和环境保护具有重要意义.将制备的纳米材料Fe_3O_4@SiO_2-CHO与伯克霍尔德氏菌脂肪酶以共价交联的方式固定,通过响应面法(RSM)优化其固定化... 生物柴油是一种可再生且环保的化石燃料的替代品,研究固定化酶生产生物柴油对解决石化燃料耗尽和环境保护具有重要意义.将制备的纳米材料Fe_3O_4@SiO_2-CHO与伯克霍尔德氏菌脂肪酶以共价交联的方式固定,通过响应面法(RSM)优化其固定化的条件,然后以固定化酶催化橄榄油生产生物柴油,并对影响生物柴油制备的因素进行优化,最后通过GC-MS检测转酯产物的成分.结果表明:在加酶量30.22 m L、戊二醛浓度2%、固定化温度40℃、固定化时间4 h时得到最大的固定化脂肪酶酶活和固定化效率,分别为10 038 U/g和96.9%.然后以此最佳条件制得的固定化酶催化制备生物柴油,得到最优条件为加酶量1.5 g、醇油比4:1、反应温度30℃、反应时间4 h.最后用GC-MS分析所得产物,得到最大转酯效率为98.84%,且固定化酶重复转酯10次后,转酯效率仍可达90%.本研究获得的Fe_3O_4@SiO_2-CHO固定化酶不仅能在短时间内催化得到很高的生物柴油产量,且易回收、可重复使用、生产成本大大降低,是工业化生产生物柴油的一种高效环保的生物酶催化剂. 展开更多
关键词 磁性纳米复合载体 Fe3O4@SiO2-CHO 脂肪酶固定化 响应面法 生物柴油
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核壳结构Fe_3O_4@SiO_2复合纳米粒子的制备 认领 引用 被引量：7
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作者 郑浩然 刘刚 +2 位作者 吴惠霞 杨红 杨仕平 《化学研究与应用》 CAS 北大核心 2010年第5期587-591,共5页
In this paper,chemical co-precipitation method was employed to synthesize Fe3O4 nanoparticles which can be well dispersed in water by using citric acid as a surfactant.Afterwards,by using Fe3O4 nanoparticles as seeds ... In this paper,chemical co-precipitation method was employed to synthesize Fe3O4 nanoparticles which can be well dispersed in water by using citric acid as a surfactant.Afterwards,by using Fe3O4 nanoparticles as seeds in a Triton X-100/hexanol/cyclohexane/water reverse microemulsion system,the core-shell structural Fe3O4@SiO2 nanocomposite particles were prepared via hydrolysis and condensation of tetraethyl orthosilicate(TEOS) under the catalysis of alkali.The effects of different stirring methods and the concentration of TEOS on the morphology of Fe3O4@SiO2 nanoparticles were investigated.The results show that the mechanical stirring can effectively control the morphology of composite nanoparticles to form a good dispersion and spherical morphology of core-shell nanoparticles.With the increase of TEOS concentration,the thickness of the SiO2 shell increases,and the morphology of the composite particles becomes more uniform. 展开更多
关键词 化学共沉淀法 Fe3O4纳米粒子 反相微乳液 Fe3O4@SiO2复合纳米粒子
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Fe3O4@SiO2@Ag纳米复合材料的制备及其对苯唑西林的表面增强拉曼光谱检测 认领 引用 被引量：6
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作者 徐娅娟 黄烁 +3 位作者 李利军 程昊 黄文艺 冯军 《分析科学学报》 CAS CSCD 北大核心 2020年第1期7-12,共6页
以水热法合成的Fe3O4磁性纳米粒子为核,以SiO2为包覆壳,采用晶种法在其表面沉积银纳米粒子(AgNP3),制备具有高活性及“核-壳”结构的Fe3O4@SiO2@Ag表面增强拉曼光谱(SERS)活性基底。通过扫描电镜、透射电镜、能谱、X射线衍射和傅里叶变... 以水热法合成的Fe3O4磁性纳米粒子为核,以SiO2为包覆壳,采用晶种法在其表面沉积银纳米粒子(AgNP3),制备具有高活性及“核-壳”结构的Fe3O4@SiO2@Ag表面增强拉曼光谱(SERS)活性基底。通过扫描电镜、透射电镜、能谱、X射线衍射和傅里叶变换红外光谱等技术手段对其形貌与结构进行表征。结果表明,该基底粒径均一、分散均匀。利用该SERS活性基底对苯唑西林进行SERS检测,结果表明对苯唑西林具有极高的灵敏度,检测限达1.0×10^-11 mol/L。同时,对苯唑西林的浓度和1028 cm^-1特征峰强度进行线性拟合,其线性关系良好,相关系数r为0.996。该SERS活性基底的稳定性好、灵敏度高,已成功应用于不同剂型药物中苯唑西林的快速检测。 展开更多
关键词 表面增强拉曼光谱 Fe3O4@SiO2@Ag 苯唑西林
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Fe3+掺杂Fe_3O_4@SiO_2@TiO_2型光催化剂的制备及其光催化性能 认领 引用 被引量：8
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作者 焦琳娟 李永豪 吴晓莹 《化学研究与应用》 CAS CSCD 北大核心 2018年第9期1416-1422,共7页
采用溶胶-凝胶法制备了0. 35mol%Fe3+掺杂Fe_3O_4@SiO_2@TiO_2新型复合光催化剂,并对其进行表征和光催化活性的研究。结果表明,在掺杂度为0. 35mol%,钛酸四丁酯和Fe_3O_4@SiO_2的用量为9mL:0. 5g(v:m),450℃煅烧4. 0h时光催化性能最... 采用溶胶-凝胶法制备了0. 35mol%Fe3+掺杂Fe_3O_4@SiO_2@TiO_2新型复合光催化剂,并对其进行表征和光催化活性的研究。结果表明,在掺杂度为0. 35mol%,钛酸四丁酯和Fe_3O_4@SiO_2的用量为9mL:0. 5g(v:m),450℃煅烧4. 0h时光催化性能最好。新型复合光催化剂具有良好的磁分离特性,与纯TiO_2相比,吸收光区明显红移,吸光能力增强,能快速降解有机污水,5次循环使用后回收率为90%以上,降解率为85%以上,可显著降低二次污染和催化剂的使用成本,具有开发价值。 展开更多
关键词 0.35mol%Fe^3+掺杂Fe3O4@SiO2@TiO2 复合光催化剂 磁性 光催化活性 甲基对硫磷
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Cu-Mn/Fe_3O_4@SiO_2@KCC纳米催化剂制备及其催化臭氧化降解对苯二甲酸性能 认领 引用 被引量：6
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作者 牛建瑞 李文亚 +4 位作者 李宗泽 刘艳芳 孙雪聪 谢欢欢 李再兴 《科学技术与工程》 北大核心 2018年第6期354-360,共7页
采用微乳法及浸渍法合成负载型铜锰单分散核壳磁性纤维状纳米催化剂(Cu-Mn/Fe_3O_4@SiO_2@KCC),利用XRD、TEM、BET、VSM等手段对其表征;并通过构建类均相催化臭氧化降解对苯二甲酸(100 mg·L-1)的研究,考察其催化性能。结果表明... 采用微乳法及浸渍法合成负载型铜锰单分散核壳磁性纤维状纳米催化剂(Cu-Mn/Fe_3O_4@SiO_2@KCC),利用XRD、TEM、BET、VSM等手段对其表征;并通过构建类均相催化臭氧化降解对苯二甲酸(100 mg·L-1)的研究,考察其催化性能。结果表明:臭氧通入量13.92 mg·min-1、催化剂投加量40 mg·L-1和pH=9时,对苯二甲酸去除率高达90.97%,TOC去除率可达30%。五次循环试验后对苯二甲酸降解率仍稳定在88.23%。 展开更多
关键词 催化臭氧氧化 Cu-Mn/Fe3O4@SiO2@KCC 纳米催化剂 类均相体系 对苯二甲酸
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