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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (15): 1461-1466.    下一篇

研究论文

羧甲基纤维素/Fe3O4复合纳米磁性材料的制备、表征及吸附性能的研究

曹向宇1，李垒*,2，陈灏3   

  1. (1辽宁大学生命学院 沈阳 100036)
    (2北京市水利科学研究所 北京 100048)
    (3中国科学院生态环境研究中心环境水质学国家重点实验室 北京 100085)
  • 投稿日期:2010-01-21 修回日期:2010-04-02 发布日期:2010-04-15
  • 通讯作者: 曹向宇 E-mail:caoxiangyu@lnu.edu.cn
  • 基金资助:

    水体颗粒物微界面形态表征、反应过程与作用机理

Preparation, Characterization and Adsorbability of Magnetic Carboxymethyl Cellulose/Fe3O4 Nano-Composite Particles

Cao Xiangyu1 Li Lei*,2 Chen Hao3   

  1. (1 School of Life Science, Liaoning University, Shenyang 110036)
    (2 State Key Laboratory of Environmental Aquatic Chemistry, Beijing 100048)
    (3 Research Center for Co-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085)
  • Received:2010-01-21 Revised:2010-04-02 Published:2010-04-15
  • Contact: CAO XiangYu E-mail:caoxiangyu@lnu.edu.cn

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采用改进的氧化沉淀法在羧甲基纤维素(CMC)体系中制备了以磁性纳米Fe3O4为核心, 外层包覆羧甲基纤维素的复合磁性纳米材料. 用透射电镜、X射线衍射、红外光谱、Zeta电位和震动样品磁强计对复合纳米Fe3O4进行了表面形貌、结构和磁学的表征. 在此基础上研究了复合纳米Fe3O4对Cu2＋的吸附性能, 探讨了溶液pH、反应时间和 Cu2＋的初始浓度对其吸附性能的影响. 实验结果表明, 复合Fe3O4粒子为反尖晶石型, 平均粒径在40 nm左右, 羧甲基纤维素在Fe3O4粒子表面是化学吸附, 复合Fe3O4粒子的饱和磁化强度为36.74 emu/g, 在中性溶液中Cu2＋的吸附量最高, 吸附平衡时间为1.5 h, 二级动力学模型能够很好地拟合吸附动力学数据, 吸附等温数据符合Langmuir模型. 复合纳米Fe3O4对Cu2＋的吸附机理主要为表面配位反应.

关键词: 氧化沉淀法, 羧甲基纤维素, 纳米Fe3O4, 磁性粒子

CMC-Fe3O4 nano-composite particles were prepared in the carboxymethyl cellulose CMC solution by a modified oxidation deposition method, and characterized by TEM, XRD, IR, ZP (zeta potential) and VSM (vibrating sample magnetometer). The adsorption of Cu2＋ on CMC-Fe3O4 was further researched. Different pH, reaction time and Cu2＋ initial concentration affecting adsorption of CMC-Fe3O4 was studied. The results show that CMC-Fe3O4 is inverse spinel structure; the particle size is 40 nm on an average and dispersed homogeneously in water. Carboxymethyl cellulose molecules are chemically adsorbed on the surface of Fe3O4 nano-particles. Its saturation magnetization is 36.74 emu/g. The maximum adsorption for Cu2＋ occurred at pH＝7 in water. The adsorption equilibrium time was reached in 1.5 h. The adsorption kinetics and isotherm data were well described by pseudo-second-order equation and Langmuir isotherm models, respectively. The adsorption mechanism of Cu2＋ was main complexation reaction.

Key words: oxidation deposition method, carboxymethyl cellulose, Fe3O4 nano-particle, magnetic particle