| Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
In order to improve Cu (II) adsorption ability of chelating resins based on a macrocyclic ligant 1,4,8,11-tetraazacyclotetradecane-5,7-dione (L) bound to crosslinked copolymers, the resins were prepared by reaction of L with poly (glycidyl methacrylate)s crosslinked with ethylene dimethacrylate (1G), tetraethylene glycol dimethacrylate (4G) or nonaethylene glycol dimethacrylate (9G). by systematically changing amounts of each crosslinker (degree of crosslinking) and of isobutyl acetate (IBA) as diluent in the suspension polymerization of the monomers, precursory copolymers with various degrees of crosslinking and different specific surface areas (SSAs) were prepared and L was introduced into them. Ligand contents, SSAs and Cu (II) adsorption abilities of the functionalized resins were evaluated, and it was clarified that resins derived from precursors, which were prepared by using crosslinker 4G or 9G in the presence of 120 - 160 vol% of IBA,exhibit high capacities for Cu (II), whereas the capacities of resins crosslinked with 1G are not so high. From further detailed study on uptake of metal ions using the resins RG4D (10) -140 and RG9D (10) -140, which were derived from the precursors prepared by using 10 mol% of the respective crosslinkers 4G and 9G in the presence of 140 vol% of IBA,it turned out that RG9D (10) -140 is much superior to RG4D (10) -140 in the column-mode adsorption of Cu (II), indicating that not only the selection of the suitable crosslinker but also the use of the pertinent amount of the diluent are very important to improve performances of the resins based on the presented ligand.
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