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›› 2011, Vol. 11 ›› Issue (2): 221-226.

• 反应与分离 • 上一篇    下一篇

亚氨乙酸型螯合吸附材料IAA-PEI/SiO2对重金属离子的螯合吸附行为

李延斌 高保娇 杜瑞奎   

  1. 中北大学化工系 中北大学化工系 山西太原中北大学化工系
  • 收稿日期:2011-01-21 修回日期:2011-03-30 出版日期:2011-04-20 发布日期:2011-04-20
  • 通讯作者: 高保娇

Chelating Adsorption Behavior of Imido-acetic Acid-type Composite Chelating Adsorption Material IAA-PEI/SiO2 for Heavy Metal Ions

LI Yan-bin GAO Bao-jiao DU Rui-kui,   

  1. Dept. Chem. Eng., North China University Department of Chemical Engineering, North University Department of Chemical Engineering, North University of China
  • Received:2011-01-21 Revised:2011-03-30 Online:2011-04-20 Published:2011-04-20
  • Contact: GAO Bao-jiao

摘要: 将聚胺大分子聚乙烯亚胺(PEI)接枝于微米级硅胶微粒表面,制得接枝微粒PEI/SiO2,然后使氯乙酸与PEI大分子中的伯、仲胺基发生亲核取代反应,形成亚氨乙酸(IAA)型螯合吸附材料IAA-PEI/SiO2. 研究了IAA-PEI/SiO2对重金属离子的螯合吸附行为和吸附机理. 结果表明,由于亚氨乙酸基团与重金属离子之间的静电作用与配位螯合作用,IAA-PEI/SiO2对重金属离子可产生强的螯合吸附作用,对Ni2+的吸附容量可达1.4 mmol/g;吸附过程为放热过程;在可抑制重金属离子水解的pH范围内,pH值越高,吸附能力越强;IAA-PEI/SiO2对重金属离子的吸附容量顺序为Ni2+> Pb2+>Cu2+>Cd2+.

关键词: 螯合吸附材料, 亚氨乙酸型, 聚乙烯亚胺, 氯乙酸, 重金属离子

Abstract: Polyamine polyethyleneimine (PEI) was grafted onto micron-sized silica gel particles, obtaining the grafted particles PEI/SiO2. Subsequently, the nucleophilic substitution reaction between chloroactic acid and the first and secondary amino groups of PEI/SiO2 was performed, forming the imido-acetic acid (IAA)-type composite chelating adsorption material IAA-PEI/SiO2. The chelating adsorption characteristics of IAA-PEI/SiO2 to heavy metal ions, and the adsorption mechanism were investigated. The experimental results showed that IAA-PEI/SiO2 possesses strong adsorption ability for heavy metal ions by right of the synergism of electrostatic interaction and coordination chelating action between imido-acetic acid groups and heavy metal ions. The adsorption process of IAA-PEI/SiO2 towards heavy metal ions is exothermic. In the pH range, the hydrolysis of the heavy metal ions can be inhibited, the chelating adsorption ability of IAA-PEI/SiO2 to heavy metal ions increases with increasing pH value. The adsorption ability order of IAA-PEI/SiO2 to heavy metal ions is Ni2+>Pb2+>Cu2+>Cd2+.

Key words: composite chelating adsorption material, imido-acetic acid type, polyethyleneimine, chloroacetic acid, heavy metal ion

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