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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2011,Vol.27>> Issue(06)>> 1474-1481     doi: 10.3866/PKU.WHXB20110529         中文摘要
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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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.



Keywords: Iminodiacetic acid   Glycidyl methacrylate   Chelating action   Heavy metal ion   Rare earth ion  
Received: 2010-12-31 Accepted: 2011-02-03 Publication Date (Web): 2011-04-15
Corresponding Authors: GAO Bao-Jiao Email: gaobaojiao@126.com

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

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[J]. Acta Phys. -Chim. Sin., 2011,27 (06): 1474-1481.    doi: 10.3866/PKU.WHXB20110529

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