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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (22): 2673-2681. 上一篇    下一篇

研究论文

Cu(II), Cr(VI)共存时四乙烯五胺功能化纳米Fe3O4磁性高分子材料的吸附机理探索

龚红霞1，胡培珠1，姜梦芸1，黄晓玲1，沈涛1，葛伟伟1，潘胜东1,2，沈昊宇*,1   

  1. (1浙江大学宁波理工学院 宁波 315100)
    (2浙江大学理学院 杭州 310027)
  • 投稿日期:2011-04-29 修回日期:2011-06-11 发布日期:2011-07-14
  • 通讯作者: 沈昊宇 E-mail:hyshen@nit.zju.edu.cn
  • 基金资助:

    浙江省重点科技创新团队研究项目

Adsorption Mechanism Investigation of Tetraethylenepentamine- functionalized Nano-Fe3O4 Magnetic Polymers in Cu(II), Cr(VI) Co-existing Water System

Gong Hongxia1 Hu Peizhu1 Jiang Mengyun1 Huang Xiaoling1 Shen Tao1 Ge Weiwei1 Pan Shengdong1,2 Shen Haoyu*,1   

  1. (1 Ningbo Institute of Technology, Zhejiang University, Ningbo 315100)
    (2 College of Science, Zhejiang University, Hangzhou 310027)
  • Received:2011-04-29 Revised:2011-06-11 Published:2011-07-14
  • Contact: Shen Hao-Yu Shen E-mail:hyshen@nit.zju.edu.cn

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采用分散聚合法通过共聚、开环反应制备得到四乙烯五胺(TEPA)功能化纳米Fe3O4磁性高分子材料(TEPA-NMPs). 通过采取TEPA-NMPs先吸附Cu(II)后吸附Cr(VI)、先吸附Cr(VI)后吸附Cu(II)及同时吸附Cu(II), Cr(VI)三种方案着重探索了TEPA-NMPs在不同pH条件下对Cu(II), Cr(VI)共存体系的吸附机理. 研究结果表明: 以TEPA-NMPs为吸附剂, Cu(II), Cr(VI)在共存体系中的吸附行为既存在竞争又存在协同作用, 其吸附机理涉及配位、静电和离子交换作用|TEPA-NMPs吸附Cu(II)或吸附Cr(VI)后可以得到对另一种离子[Cr(VI)或Cu(II)]仍有吸附作用的新材料(Cu-TEPA-NMPs, Cr-TEPA-NMPs), 这两种材料与TEPA-NMPs相比不仅吸附性能可以相媲美, 而且还具有选择性高和更宽的pH适用范围等优点.

关键词: 四乙烯五胺功能化纳米磁性高分子, Cu(II), Cr(VI)共存体系, 吸附机理, pH影响

A novel NH2-functionalized nano-sized magnetic polymer adsorbent coupled with tetraethylenepentamine (TEPA), named as TEPA-NMPs, has been obtained via co-polymerization and ring-opening reactions, followed by chemical co-precipitation for the preparation of Fe3O4. Three approaches, e.g. by adsorbing Cu(II), Cr(VI) from water simultaneously, or adsorbing Cr(VI) followed by adsorbing Cu(II), and vice versa, were applied for the investigation of adsorption mechanism of TEPA-NMPs in Cu(II), Cr(VI) co-existing water system. The results showed that the adsorption Cu(II) or/and Cr(VI) on TEPA-NMPs was competitive as well as cooperative. The adsorption mechanisms of Cu(II), Cr(VI) co-existing system could be related with coordination interactions, electrostatic attraction, and ion exchange. New adsorbents can be obtained via adsorption of Cu(II) or Cr(VI) by TEPA-NMPs, named as Cu-TEPA-NMPs and Cr-TEPA-NMPs, respectively. Cu-TEPA-NMPs and Cr-TEPA-NMPs can be reused for the adsorption of Cr(VI) or Cu(II), with high selectivity, broad pH applicable range and comparable adsorption properties with TEPA-NMPs itself.

Key words: tetraethylenepentamine-functionalized nano-magnetic ploymers, Cu(II), Cr(VI) co-existing water system, adsorption mechanism, pH effect

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