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

作者：Jiang Gui Ming; Gao Bao Jiao^*; Xu Wen Mei; Wang Xiao Hua

来源：Acta Physico - Chimica Sinica, 2011, 27(6): 1474-1481.

• Iminodiacetic acid
• Glycidyl methacrylate
• Chelating action
• Heavy metal ion
• Rare earth ion

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.

• 出版日期2011-6
• 单位中北大学