Acta Phys. -Chim. Sin. ›› 2011, Vol. 27 ›› Issue (06): 1474-1481.doi: 10.3866/PKU.WHXB20110529

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Adsorption Behavior and Thermodynamics of Iminodiacetic Acid-Type Material IDAA-PGMA/SiO2 for Heavy Metal Ions and Rare Earth Ions

JIANG Gui-Ming, GAO Bao-Jiao, XU Wen-Mei, WANG Xiao-Hua   

  1. Department of Chemical Engineering, North University of China, Taiyuan 030051, P. R. China
  • Received:2010-12-31 Revised:2011-02-03 Published:2011-05-31
  • Contact: GAO Bao-Jiao
  • Supported by:

    The project was supported by the Natural Science Foundation of Shanxi Province, China (201002100843).


Glycidyl methacrylate (GMA) was grafted onto micron-sized silica gel particles and the grafted particles of PGMA/SiO2 were obtained. Subsequently, a ring-opening reaction of the epoxy groups on the grafted PGMA was carried out using iminodiacetic acid (IDAA) as a reagent, which resulted in IDAA group bonding and in the preparation of the composite chelating particles IDAA-PGMA/SiO2. In this work, the adsorption behavior and adsorption thermodynamics of IDAA-PGMA/SiO2 toward heavy metal ions and rare earth ions were investigated, and the adsorption mechanism was investigated in depth. The experimental results show that the particles IDAA-PGMA/SiO2 possess strong adsorption action for heavy metal ions and the adsorption capacity of the Pb2+ ions reached 0.235 g·g-1. The adsorption of heavy metal ions on IDAA-PGMA/SiO2 is exothermic and is driven by enthalpy, leading to a decrease in the adsorption capacity as temperature is raised. The adsorption of rare earth ions on IDAA-PGMA/SiO2 is driven by entropy. The adsorption ability of IDAA-PGMA/SiO2 toward heavy ions is much stronger than that toward the rare earth ions.

Key words: Iminodiacetic acid, Glycidyl methacrylate, Chelating action, Heavy metal ion, Rare earth ion