摘要:利用反相悬浮分散法和聚乙二胺改性制备成Fe3O4/壳聚糖磁性微球(PEMCS)以提高其氨基含量。采用X射线衍射(XRD)、红外(IR)、热重分析(TGA)等对其进行了表征,考察PEMCS对Hg^2+和UO2^2+的吸附性能。结果表明,其吸附剂粒径小(15—30μm),吸附速率快;当氨基含量6.47mmol/g、pH〈3时可选择性分离Hg^2+和UO2^2+,因Hg^2+能与Cl^-形成络阴离子(HgCl3^-),以离子交换机理吸附,而UO2^2+则不能。对Hg^2+与UO2^2+的饱和吸附容量qm(mmol/g)分别为2.19与1.38。动力学数据采用Lagergrent拟合,对Hg^2+与UO2^2+的吸附速率常数kad(min^-1)分别为0.087和0.055。UO2^2+和Hg^2+可用1mol/LH2SO4脱附,UO2^2+还可用2mol/LHCl脱附,脱附率〉90%。
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