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Acta Phys. -Chim. Sin.  2011, Vol. 27 Issue (06): 1474-1481    DOI: 10.3866/PKU.WHXB20110529
CATALYSIS AND SURFACE SCIENCE     
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
Department of Chemical Engineering, North University of China, Taiyuan 030051, P. R. China
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Abstract  

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 wordsIminodiacetic acid      Glycidyl methacrylate      Chelating action      Heavy metal ion      Rare earth ion     
Received: 31 December 2010      Published: 15 April 2011
MSC2000:  O648  
  O631  
Fund:  

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

Corresponding Authors: GAO Bao-Jiao     E-mail: gaobaojiao@126.com
Cite this article:

JIANG Gui-Ming, GAO Bao-Jiao, XU Wen-Mei, WANG Xiao-Hua. Adsorption Behavior and Thermodynamics of Iminodiacetic Acid-Type Material IDAA-PGMA/SiO2 for Heavy Metal Ions and Rare Earth Ions. Acta Phys. -Chim. Sin., 2011, 27(06): 1474-1481.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20110529     OR     http://www.whxb.pku.edu.cn/Y2011/V27/I06/1474

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