Preparation of iminodiacetic acid-type composite chelating material IDAA-PGMA/SiO2 and preliminary studies on adsorption behavior of heavy metal ions and rare earth ions

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[1] Gao, Baojiao
[2] Jiang, Guiming
[3] An, Fuqiang
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Gao, B. (gaobaojiao@126.com) | 1600年 / John Wiley and Sons Inc卷 / 125期
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A kind of iminodiacetic acid (IDAA)-type composite chelating materials was prepared by first graft polymerization and subsequent polymer reaction. Monomer glycidyl methacrylate (GMA) was grafted on micron-sized silica gel particles in the manner of graft through in a solution polymerization system; resulting in the grafted particles poly(glycidyl methacrylate) (PGMA)/silicon dioxide (SiO2). Subsequently; the ring-opening reaction of the epoxy groups of the grafted PGMA was carried out with IDAA as reaction reagent; resulting in the bonding of IDAA groups onto PGMA/SiO2 and obtaining the composite chelating material IDAA-PGMA/SiO2 particles. The effects of the main factors on the graft polymerization of GMA and the bonding reaction of IDAA were examined emphatically; and the adsorption behavior of IDAA-PGMA/SiO2 particles toward several kinds of heavy metal ions and rare earth ions was preliminarily explored. The experiments results show that: (a) to obtain the grafted particles PGMA/SiO2 with high grafting degree; in the graft polymerization step; the reaction temperature and the used amount of initiator should be controlled. The suitable temperature is 70°C and the appropriate used amount of initiator is 1.4 % of the monomer mass. Under the optimal conditions; the grafted degree of PGMA can reach 17.50 g/100 g. (b) It is feasible to introducing of IDAA groups onto PGMA/SiO2 particles via ring-opening reaction of epoxy groups of the grafted PGMA under alkaline conditions; and the bonding rate of IDAA group can get up to 70% based on epoxy groups of the grafted PGMA. (c)The composite chelating material IDAA-PGMA/SiO2 possesses very strong chelating adsorption ability for heavy metal ions; and especially toward Pb2+ ion; the adsorption capacity can reach 24 g/100 g. (d) The adsorption ability of IDAA-PGMA/SiO 2 for rare earth ions is weaker than that for heavy metal ions. © 2012 Wiley Periodicals; Inc;
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