| 초록 |
To obtain the optimum synthetic conditions for functionalized acrylonitrile(AN) and styrene(S) grafted PP[PP-g-(AN/S)] membranes, which selectively adsorb uranium, PP-g-(AN/S) was synthesized by the irradiation grafting technique with electron beam accelerator using AN and S as monomers onto PP fiber and its subsequent amidoximination and phosphorylation. Mole fraction of AN in the graft chain increased as increase in the AN content in the monomer mixture. The highest AN grafting yield of 45% was obtained at a monomer ratio of 40 vol% AN : 60 vol% styrene. Mole fraction of AN in the graft chain decreased with increasing methanol content. As reaction temperature increased, the grafting yield of copolymer increased and reached equilibrium at 50 ℃. Amount of amidoxime group in fibrous ion exchanger was increased as increasing amount of hydroxylamine (HA), and the maximum content of amidoxime group was observed at 5.8 mmol/g with the 9 wt% HA concentration. Content of phosphorous group in fibrous ion exchanger increased up to 0.5N phosphoric acid (PAc) concentration, and then leveled off. The adsorption ability of the copolymer for uranyl ion by the chelating adsorbents was in the following order : Bifunctional PP-g-(AN/S)〉amidoximated PP-g-(AN/S)〉phosphorylated PP-g-(AN/S). |
