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Journal of Environmental Sciences 2020年第12期32卷 186-195页

作者： Ting Li Jianru Liang Lixiang Zhou College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China

Here we reported an effective method to solve the rate-limiting steps, such as the reduction of fe^(3+) to fe^(2+) and an invalid decomposition of H2o2 in a conventional fenton-like reaction. A magnetic heterogeneous photocatalyst, Fe3O4-schwertmannite(Fe3O4-sch) was successfully developed by adding Fe3O4 in the formation process of schwertmannite. Fe3O4-sch shows excellent electrons transfer ability and high utilization efficiency of H2o2(98.5%). The catalytic activity of Fe3O4-sch was studied through the degradation of phenol in the heterogeneous photo-fenton process. Phenol degradation at a wide pH(3-9) was up to 98% within 6 min under visible light illumination with the Fe3O4-sch as heterogeneous fenton catalyst, which was higher than that using pure schwertmannite or Fe3O4. The excellent photocatalytic performance of Fe3O4-sch is ascribed to the effective recycling between ≡fe^(3+) and ≡fe^(2+) by the photo-generated electron, and also profit from the formation of the "Z-Scheme" system. According to the relevant data, photocatalytic mechanism of Fe3O4-sch for degrading phenol was proposed. This study not only provides an efficient way of enhancing heterogeneous fenton reaction, but also gives potential application for iron oxyhydroxysulfate mineral.

关键词： Fe3O4 Schwertmannite Phenol degradation Photocatalytic activity Photocatalytic mechanism

自组装法制备磺化聚苯乙烯@Fe3O4磁性复合颗粒及其磁性能

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复合材料学报 2020年第6期37卷 1364-1369页

作者：宋月英韩丁关晓琳雷西萍西安建筑科技大学材料科学与工程学院西安710055 西北师范大学化学化工学院兰州730070

实现结构可控、均匀包覆是制备核-壳复合材料的关键。采用离子交换法完成了磺化聚苯乙烯(PSS)表面Na+与溶液中fe^2+/和fe^3+的交换,于碱性条件下制备了PSS表面负载Fe3O4(PSS@Fe3O4)的磁性复合颗粒。通过称重法计算了Fe3O4最大包覆率;通... 详细信息

实现结构可控、均匀包覆是制备核-壳复合材料的关键。采用离子交换法完成了磺化聚苯乙烯(PSS)表面Na+与溶液中fe^2+/和fe^3+的交换,于碱性条件下制备了PSS表面负载Fe3O4(PSS@Fe3O4)的磁性复合颗粒。通过称重法计算了Fe3O4最大包覆率;通过振动样品磁强计(VSM)测试了不同负载含量下PSS@Fe3O4复合颗粒的磁性能;通过XRD、衰减全反射-FTIR (ATR-FTIR)、SEM-EDS分析了PSS@Fe3O4磁性复合颗粒的化学组成和微观结构。结果表明,随着fe^2+/fe^3+浓度增加,PSS@Fe3O4磁性颗粒的饱和磁化强度也随之增大,最大饱和磁化强度为7.51 emu/g,并具有明显的磁响应性;Fe3O4均匀包覆在PSS表面,最大包覆率为8.3 wt%。PSS@Fe3O4磁性复合颗粒有望用于磁流变、医学及水处理领域。

关键词：自组装法磺化聚苯乙烯 Fe3O4 磁性能复合颗粒

核壳结构Fe3O4@NC复合材料的储锂性能研究及锂离子电容器构建

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Science China Materials 2020年第11期63卷 2289-2302页

作者：周锦华徐舒迟康琪倪璐陈宁娜李小阁陆春良王喜章彭路明郭学锋丁维平侯文华 Key Laboratory of Mesoscopic Chemistry of MoE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Analytical Testing Center Yangzhou UniversityYangzhou 225009China

锂离子电容器继承了超级电容器高功率性能和锂离子电池高能量密度两者的优点.然而,高电化学性能电极材料的短缺以及正负电极材料动力学的不匹配是构筑高能量/高功率密度锂离子电池遇到的最大挑战.我们通过简单的溶液组装和煅烧法得到了... 详细信息

锂离子电容器继承了超级电容器高功率性能和锂离子电池高能量密度两者的优点.然而,高电化学性能电极材料的短缺以及正负电极材料动力学的不匹配是构筑高能量/高功率密度锂离子电池遇到的最大挑战.我们通过简单的溶液组装和煅烧法得到了具有核壳结构的Fe3O4@NC复合材料.首先,研究了不同热解温度得到的Fe3O4@NC样品的储锂性能.结构单元纳米化和丰富的微孔使得Fe3O4@NC-700具有大比表面积,同时暴露出更多的活性位点,缩短了离子传输路径,表现出特殊的赝电容行为,从而显著提高了储锂动力学.除此之外,N-掺杂的碳壳提供了较高的电子导电性并保证了在循环测试中的结构完整性.以Fe3O4@NC-700为负极,膨胀石墨烯EGN为正极,1 mol L^-1Li PF6为电解液,组装成锂离子电容器.受益于正负电极相配的动力学以及Fe3O4@NC-700和EGN两者的协同优势,Fe3O4@NC-700//EGN杂化离子电容器获得了较宽的工作电压窗口(1.0–4.5 V),比能量最高可达137 W h kg^-1,比功率最高可达8.2 k W kg^-1,且循环稳定性出色.本工作可为下一代兼具高比能量和高比功率的新型混合能源存储系统的设计提供启示.

关键词：锂离子电容器锂离子电池电子导电性储锂性能超级电容器 Fe3O4 高比功率核壳结构

Loading Fe3O4 nanoparticles on paper-derived carbon scaffold toward advanced lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第1期30卷 1-11,I0001页

作者： Jianmei Han Qiang Fu Baojuan Xi Xuyan Ni Chenglin Yan Jinkui feng Shenglin Xiong Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical Engineeringand State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100ShandongChina Soochow Institute for Energy and Materials InnovationS College of EnergySoochow UniversitySuzhou 215006JiangsuChina Key Laboratory for Liquid-solid Structural Evolution&Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061ShandongChina College of Chemistry and Chemical Engineering Taishan UniversityTai’an 271021ShandongChina

Lithium-sulfur batteries(LSBs) are regarded as a competitive next-generation energy storage device.However, their practical performance is seriously restricted due to the undesired polysulfides shuttling.Herein, a multifunctional interlayer composed of paper-derived carbon(PC) scaffold, Fe3O4 nanoparticles,graphene, and graphite sheets is designed for applications in LSBs. The porous PC skeleton formed by the interweaving long-fibers not only facilitates fast transfer of Li ions and electrons but also provides a physical barrier for the polysulfide shuttling. The secondary Fe3O4@graphene component can reduce the polarization, boost the attachment of polysulfides, and promote the charging-discharging kinetics. The outer graphitic sheets layers benefit the interfacial electrochemistry and the utilization of S-containing species.The efficient obstruction of polysulfides diffusion is further witnessed via in situ ultraviolet-visible characterization and first-principles simulations. When 73% sulfur/commercial acetylene black is used as the cathode, the cell exhibits excellent capacity retention with high capacities at 0.5 C for 1000 cycles and even up to 10 C for 500 cycles, an ultrahigh rate capability up to 10 C(478 m Ah g-1), and a high arealsulfur loading of 8.05 mg cm-2. The strategy paves the way for developing multifunctional composites for LSBs with superior performance.

关键词： Paper-derived carbon nanosheets Fe3O4 Lithium-sulfur batteries Multifunctional interlayer Polysulfides

Mno2@Fe3O4/石墨烯复合材料对水中Pb(Ⅱ)的吸附

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中国环境科学 2020年第7期40卷 2888-2900页

作者：龙昊宇黄彬彬翁白莎王悦南昌工程学院鄱阳湖流域水工程安全与资源高效利用国家地方联合工程实验室江西南昌330099 中国水利水电科学研究院水资源研究所北京100038

以氧化石墨烯(Go)为原料制备Mno2@Fe3O4/石墨烯(RGo),考察吸附过程中Mno2@Fe3O4/RGo投加量、溶液pH值、初始浓度和吸附时间等因素对Pb(Ⅱ)的去除率和吸附量的影响,并运用BET比表面积测试法计算Mno2@Fe3O4/RGo的比表面积和平均孔径,采用... 详细信息

以氧化石墨烯(Go)为原料制备Mno2@Fe3O4/石墨烯(RGo),考察吸附过程中Mno2@Fe3O4/RGo投加量、溶液pH值、初始浓度和吸附时间等因素对Pb(Ⅱ)的去除率和吸附量的影响,并运用BET比表面积测试法计算Mno2@Fe3O4/RGo的比表面积和平均孔径,采用扫描电子显微镜(SEM),振动样品磁强计(VSM),X射线衍射(XRD)和X射线光电子能谱(XPS)等对样品进行表征.结果表明:Mno2@Fe3O4/RGo的比表面积为89.164m^2/g,孔容为0.284cm^3/g;随着pH值在2~10范围内增加,复合材料对Pb(Ⅱ)的去除率先增大后减小,pH=6时达到最大值.通过4种等温吸附模型(Langmuir、Freundlich、Temkin、D-R模型)和4种吸附动力学模型(伪一级动力学、伪二级动力学、Elovich、颗粒内扩散模型)拟合发现,Mno2@Fe3O4/RGo对Pb(Ⅱ)吸附符合伪二级动力学模型.吸附等温线更符合Langmiur模型,属于典型的单分子层吸附,以化学吸附为主,最大吸附量为265.3mg/g.

关键词：石墨烯 Fe3O4 Mno2 Pb(Ⅱ) 吸附

ATP适体接枝fe_3o_4纳米粒子的制备及化学发光酶检测应用

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无机化学学报 2017年第2期33卷 340-346页

作者：严喜鸾陈馨高文菊魏婷婷林月敏艾凡荣南昌大学资源环境与化工学院南昌330031 南昌大学机电工程学院南昌330031 南昌大学转化医学研究院南昌330031

制备了油酸修饰的fe_3o_4纳米粒子,利用盐酸多巴胺对其表面进行氨基化改性,制得水分散性良好的fe_3o_4纳米粒子,用X射线衍射、透射电镜、傅里叶变换红外光谱仪、振动样品磁强计和紫外-可见吸收光谱进行表征。随后,将氨基修饰的三磷酸腺... 详细信息

制备了油酸修饰的fe_3o_4纳米粒子,利用盐酸多巴胺对其表面进行氨基化改性,制得水分散性良好的fe_3o_4纳米粒子,用X射线衍射、透射电镜、傅里叶变换红外光谱仪、振动样品磁强计和紫外-可见吸收光谱进行表征。随后,将氨基修饰的三磷酸腺苷(ATP)适体接枝到fe_3o_4纳米粒子上,结合荧光素酶化学发光法进行ATP的定量检测,并应用于市售酸奶中乳酸菌ATP含量的检测,其灵敏度高、重现性好。各项实验结果表明所制备的fe_3o_4纳米粒子是一种分散性好、易分离的载体,其粒径均一、稳定、磁性强、与适体结合性能好,拓展了fe_3o_4纳米粒子在分析检测领域的应用。

关键词： Fe3O4 纳米粒子氨基功能化适体化学发光检测

Fe3O4@锂铝硅微晶玻璃/还原氧化石墨烯复合材料的制备和吸波性能

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复合材料学报 2019年第11期36卷 2651-2664页

作者：杨亚楠夏龙张昕宇韩海波王珂温广武哈尔滨工业大学威海材料科学与工程学院威海264209 上海卫星装备研究所上海200240 山东理工大学材料科学与工程学院淄博255000

为了改善传统磁性吸波材料的阻抗匹配和提升吸波性能,将传统的磁性材料Fe3O4、透波材料锂铝硅微晶玻璃(LAS)和还原氧化石墨烯(RGo)进行复合,采用三步法制备Fe3O4@LAS/RGo磁性吸波复合材料。通过多种测试手段对其结构、形貌和组成进行表... 详细信息

为了改善传统磁性吸波材料的阻抗匹配和提升吸波性能,将传统的磁性材料Fe3O4、透波材料锂铝硅微晶玻璃(LAS)和还原氧化石墨烯(RGo)进行复合,采用三步法制备Fe3O4@LAS/RGo磁性吸波复合材料。通过多种测试手段对其结构、形貌和组成进行表征,并分析其电磁参数和吸波性能。研究了基体氧化石墨烯(Go)添加量对Fe3O4@LAS/RGo复合材料的形成和吸波性能的影响,随着Go含量的增加,Fe3O4@LAS纳米球的分布变得稀疏,RGo堆叠程度变大。Go的质量分数为40wt%(Fe3O4与LAS摩尔比为1∶0.2)时,Fe3O4@LAS/RGo复合材料的吸波性能最佳,反射损耗在12.4GHz处达到-65dB,且仅需要2.1mm的匹配厚度,在该厚度下小于-10dB(超过90%的电磁波被材料吸收)的反射损耗达到4GHz。LAS作为涂覆在Fe3O4纳米球表面的透波层,引入了多重透射-吸收机制。

关键词： Fe3O4 锂铝硅微晶玻璃还原氧化石墨烯电磁波吸收介电损耗

改性氧化石墨烯/fe_3o_4复合材料的制备及电磁吸收性能

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复合材料学报 2019年第3期36卷 708-714页

作者：奚洪亮李伟铭赵永彬陈爱华山东欧铂新材料有限公司东营257200 北京航空航天大学材料科学与工程学院北京100191

为改善氧化石墨烯(Go)/fe_3o_4复合材料的分散程度,利用三苯基膦(PPh3)对Go表面进行功能化改性得到改性氧化石墨烯(GoP),然后采用共沉淀法一步合成GoP/fe_3o_4复合材料。通过场发射SEM、高分辨TEM、XRD、FTIR、Raman和VSM对GoP/fe_3o_4... 详细信息

为改善氧化石墨烯(Go)/fe_3o_4复合材料的分散程度,利用三苯基膦(PPh3)对Go表面进行功能化改性得到改性氧化石墨烯(GoP),然后采用共沉淀法一步合成GoP/fe_3o_4复合材料。通过场发射SEM、高分辨TEM、XRD、FTIR、Raman和VSM对GoP/fe_3o_4复合材料的形貌、结构和磁性能进行表征。利用矢量网络分析仪(PNA)测试了GoP/fe_3o_4复合材料的电磁参数并模拟计算其对电磁波的吸收性能。结果显示:GoP/fe_3o_4复合材料的最大电磁波吸收强度值达到-25.4dB,有效吸收频宽为6.0GHz,较未改性Go/fe_3o_4复合材料均有大幅度提高。

关键词：氧化石墨烯 Fe3O4 改性复合材料电磁吸收

Highly efficient and flexible preparation of water-dispersed Fe3O4 nanoclusters using a micromixer

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Particuology 2019年第4期17卷 42-48页

作者： Xiaojing Liu Yangcheng Lu State Key Laboratory of Chemical Engineering Department of Chemical Engineering Tsinghua University Beijing 100084 China

Solvent exchange is widely used to synthesize magnetic nanoclusters (MNCs).However,it remains a challenge to increase the production and decrease the addition ofsurfactants,both of which are important for the application and functionalization of MNCs.Herein,we use a rapid and tunable mixing method to control the assembly of Fe3O4 nanoparticles.This method involves shear-mixing in a channel of a Tjunction micromixer.Smaller and more monodisperse MNCs were synthesized with less surfactant,when compared with conventional bulk synthesis.Varying the mixing rate and the formula of the magnetic suspension allowed for the flexible adjustment of the nanocluster size while maintaining a uniformly sized MNCs.The flow synthesis and ease of scale-up make this method potentially suitable for broad industrial application.

关键词： Fe3O4 Magnetic nanoparticle Magnetic nanocluster Micromixer-assisted continuous synthesis Bulk synthesis

Fe3O4 nanoparticle-enabled mode-locking in an erbiumdoped fiber laser

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Frontiers of optoelectronics 2020年第2期13卷 149-155页

作者： Xiaohui LI Jiajun PENG Ruisheng LIU Jishu LIU Tianci feNG Abdul Qyyum Cunxiao GAo Mingyuan XUE Jian ZHANG College of Physics and Information Technology Shaanxi Normal UniversityXi'an 710119China State Key Laboratory of Transient optics and Photonics Xi'an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi'an 710119China

In this paper,we have proposed and demonstrated the generation of passively mode-locked pulses and dissipative soliton resonance in an erbium-doped fiber laser based on Fe3O4 nanoparticles as saturable absorbers.We obtained self-starting mode-locked pulses with fundamental repetition frequency of 7.69 MHz and center wavelength of 1561 nm.The output of a pulsed laser has spectral width of 0.69 nm and pulse duration of 14 ns with rectangular pulse profile at the pump power of 190 mW.As far as we know,this is the first time that Fe3O4 nanoparticles have been developed as low-dimensional materials for passive mode-locking with rectangular pulse.our experiments have confirmed that Fe3O4 has a wide prospect as a nonlinear photonics device for ultrafast fiber laser applications.

关键词： Fe3O4 rectangular pulse dissipative soliton erbium-doped fiber nonlinear photonics