Abstract
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.
Highlights
Rare metals with conductivity and transparency, such as indium, are essential for the production of display panels, such as LCD, OLED and PDP
Ion exchange capacity, water uptake, and the optimal conditions for the synthesis of the resin and the adsorption of indium via adsorption tests using artificial indium tin oxide (ITO) solutions
The conversions were calculated from Equation (1), where the initial weights of the monomers revealed the weights before the synthesis of the poly(VPA-co-GMA-co-divinyl benzene (DVB)) resins in the cases of both synthesis and functionalization
Summary
Rare metals with conductivity and transparency, such as indium, are essential for the production of display panels, such as LCD, OLED and PDP. To separate indium from ITO waste fluid which is produced during the display etching process called “urban mining,” the development of a selective adsorption and separation material for the recovery of indium from the etching waste fluid in highly acidic conditions is required [5,6,7]. The ion exchange method can improve the weaknesses of other methods; it is necessary to develop a highly selective adsorption material for the recovery of traces of indium from dilute solutions. Ion exchange capacity, water uptake, and the optimal conditions for the synthesis of the resin and the adsorption of indium via adsorption tests using artificial ITO solutions. Chungnam National University, 79 Daehangno, Yuseong-gu, Daejeon 305-764, Republic of Korea”
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