论文部分内容阅读
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.
The TEPA-functionalized Fe3O4 magnetic polymer materials (TEPA-NMPs) were prepared by copolymerization and ring-opening reaction using the dispersion polymerization method. The TEPA-NMPs were adsorbed on Cu (Ⅱ) , The adsorption of Cu (Ⅱ) and the simultaneous adsorption of Cu (Ⅱ) and Cr (Ⅵ) on Cr (Ⅵ) were investigated. The effects of Cu (Ⅱ) and Cr The adsorption mechanism of Cu (Ⅱ) and Cr (Ⅵ) in the coexisting system with TEPA-NMPs as adsorbent was studied. The results showed that there existed competition and synergetic interaction between Cu (Ⅱ) and Cr (Cu-TEPA-NMPs) adsorbed on the other ions [Cr (Ⅵ) or Cu (Ⅱ)] by adsorption of Cu (Ⅱ) or Cr (VI) , Cr-TEPA-NMPs), these two materials not only have comparable adsorption properties compared with TEPA-NMPs, but also have the advantages of high selectivity and wider pH range.