Poly(vinyl
phosphonic acid-co-glycidyl methacrylate-co-divinyl benzene) (PVGD) and PVGD containing an iminodi-acetic
acid group (IPVGD), which has indium ion selectivity, were synthesized by
suspension polymerization, and their indium adsorption properties were
investigated. The synthesized PVGD and IPVGD resins were characterized using
Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy
(SEM), energy-dispersive X-ray spectroscopy (EDS) and mercury porosimetry. The
cation-exchange capacity, the water uptake and the indium adsorption properties
were investigated. The cation-exchange capacities of PVGD and IPVGD were 1.2-4.5 meq/g and 2.5-6.4 meq/g, respectively. The water
uptakes were decreased with increasing contents of divinyl benzene (DVB). The
water uptake values were 25%-40% and 20%-35%, respectively. The optimum
adsorption of indium from a pure indium solution and an artificial indium tin
oxide (ITO) solution by the PVGD and IPVGD ion-exchange resins were 2.3 and 3.5
meq/g, respectively. The indium adsorption capacities of IPVGD were higher than
those of PVGD. The indium ion adsorption selectivity in the artificial ITO
solution by PVGD and IPVGD was excellent, and other ions were adsorbed only
slightly.
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