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Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (13): 1509-1514. Previous Articles     Next Articles

Original Articles

氨基功能化纳米Fe3O4磁性高分子吸附剂对废水中Cr(VI)的吸附研究

赵永纲a,b 沈昊宇*,a 李 勍a 夏清华c

  

  1. (a浙江大学宁波理工学院 宁波 315100)
    (b浙江大学理学院 杭州 310027)
    (c有机功能分子合成与应用教育部重点实验室(湖北大学) 武汉 430062)

  • 投稿日期:2008-10-13 修回日期:2008-12-19 发布日期:2009-07-14
  • 通讯作者: 沈昊宇

Adsorption Studies on Cr(VI) in Wastewater by NH2-functionalized Nano-Fe3O4 Magnetic Composites

Zhao, Yonggang a,b Shen, Haoyu *,a Li, Qing a Xia, Qinghua c

  

  1. (a Ningbo Institute of Technology, Zhejiang University, Ningbo 315100)
    (b College of Science, Zhejiang University, Hangzhou 310027)
    (c Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062)
  • Received:2008-10-13 Revised:2008-12-19 Published:2009-07-14
  • Contact: Shen, Haoyu

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A novel nano-sized magnetic polymer adsorbent coupled with ethylenediamine has been obtained via co-polymerization and ring-opening reactions, followed by chemical co-precipitation for the preparation of Fe3O4. The adsorbent was characterized by TEM, VSM, TGA, XRD, FTIR, etc. Its application to the adsorption of Cr(VI) from wastewater was also investigated. The results showed that the adsorption capability was affected by pH, the initial concentration of Cr(VI), the adsorption time and temperature. With the distributions of Cr(VI) species in function of pH under corresponding conditions, the adsorption mechanisms of Cr(VI) including both ion exchange and electrostatic gravitation were discussed. The adsorption of Cr(VI) reached equilibrium rapidly within 10 min. The adsorption data were well fitted with the Langmuir isotherm. The maximum sorption capacity of adsorbent to Cr(VI) calculated from the Langmuir isotherm was 25.58 mg/g at 308 K, pH 2.5 with volume of 40 mL. The adsorption was an endothermic process with the enthalpy deviation ΔH at 8.64 kJ/mol.

Key words: functionalized nano-Fe3O4, Cr(VI), adsorption principle, Langmuir isotherm