磁性膨胀石墨的制备及影响因素研究

doi:10.3724/SP.J.1077.2008.00794

无机材料学报

磁性膨胀石墨的制备及影响因素研究

张晏清, 孙庆荣

同济大学材料科学与工程学院, 上海 200092

收稿日期:2007-08-13 修回日期:2007-11-09 出版日期:2008-07-20 网络出版日期:2008-07-20

Influence Factors of Magnetic Exfoliated Graphite Prepared by Citrate Sol-Gel Process

ZHANG Yan-Qing, SUN Qing-Rong

School of Materials Science & Engineering, Tongji University, Shanghai 200092, China

Received:2007-08-13 Revised:2007-11-09 Published:2008-07-20 Online:2008-07-20

摘要/Abstract

摘要： 采用柠檬酸盐溶胶-凝胶法, 以可膨胀石墨、硝酸铁、硝酸钴、柠檬酸为原料制备磁性膨胀石墨, 利用SEM、EDS、XRD和磁滞回线等对其微观形貌和磁性能进行了表征, 研究了原料配比、可膨胀石墨的pH值及膨胀时间对磁性膨胀石墨的磁性能和油吸附性能的影响. 综合磁性强度、油吸附性能及制备成本等指标, 得到最佳的制备条件为: 可膨胀石墨:铁氧体(ω/ω)=2:1, 可膨胀石墨的pH=5, 在900℃膨胀温度下膨胀时间为120s. 试验结果表明: 最佳制备条件
下, 铁氧体在膨胀石墨表面和层间沉积效果良好且分布均匀, 制备出的磁性膨胀石墨具有良好的磁性强度和油吸附性能, 其饱和磁化强度和油吸附容量分别为17.95A·m²·kg^-1和32.6g·g^-1.

关键词: 柠檬酸盐溶胶-凝胶法, 磁性, 膨胀石墨

Abstract: Using exfoliatable graphite, Fe(NO₃)₃, Co(NO₃)₂ and citric acid as raw materials, magnetic exfoliated graphite (MEG) was prepared by citrate sol-gel process. The microcosmic performance and magnetic property of MEG were characterized by SEM, EDS, XRD and hysteresis loop. In addition, the effects of raw material ratio, pH value of exfoliatable graphite and expanded time on magnetic property and adsorption oil capacity of MEG were studied. Based on the factors of magnetic intensive, adsorption oil capacity and costs of preparation and so on, the optimum preparation conditions of MEG are found as follows, the ratio of exfoliatable graphite to ferrite is 2:1, the pH value of exfoliatable graphite is 5 and the expanded time is 120s at 900℃. The experimental results show that ferrite can be effectively deposited which is homogeneous distribution on/between exfoliatable graphite in the optimum preparation condition, and the prepared MEG has high magnetic intensive and adsorption oil capacity. The saturation magnetization and adsorption oil capacity of
MEG are 17.95A·m²·kg^-1 and 32.6g·g^-1, respectively.

Key words: citrate sol-gel process, magnetism intensive, exfoliated graphite

中图分类号:

TB34

张晏清,孙庆荣. 磁性膨胀石墨的制备及影响因素研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2008.00794.

ZHANG Yan-Qing,SUN Qing-Rong. Influence Factors of Magnetic Exfoliated Graphite Prepared by Citrate Sol-Gel Process[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00794.

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磁性膨胀石墨的制备及影响因素研究

Influence Factors of Magnetic Exfoliated Graphite Prepared by Citrate Sol-Gel Process

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