RECOVERY OF URANIUM FROM SEA-WATER .4. INFLUENCE OF CROSS-LINKING REAGENT ON THE URANIUM ADSORPTION OF MACRORETICULAR CHELATING RESIN CONTAINING AMIDOXIME GROUPS

Macroreticular chelating resins (RNH) containing amidoxime groups with various degrees of crosslinking were synthesized by using various amounts of ethyleneglycol dimethacrylate (1G), dimethyleneglycol dimethacrylate (2G), triethyleneglycol dimethacrylate (3G), tetraethyleneglycol dimethacrylate (4G), and nanoethyleneglycol dimethacrylate (9G) as crosslinking reagent. The effect of crosslinking reagents on the pore structure, ion exchange capacity, swelling ratio, and adsorption ability for uranium of RNH was investigated. For the preparation of RNH which have effective pore structure for the recovery of uranium, chemical, and physical stability, the simultaneous use of divinylbenzene (DFB) and 1G or 4G as crosslinking reagent was examined. RNH-DVG-1G was found to have the effective macropore and micropore for the recovery of uranium.