Preparation, Adsorption Characteristics Of Uranyl Ion Imprinted Resins For Separation Of Uranium From The Salt-lake Water

Molecular imprinting technology is a new method which developed quickly in the recent years, it can provide us with the desired structure and properties of molecular assembly. Ion imprinting technology is the development of molecular imprinting technology, it further broadens the applications of molecular imprinting technique. Uranium is an important material of modern nuclear industry and has important economic value. In this thesis, a series of uranyl ion imprinted resins were synthesized using the basic principle of imprinting technology, and their adsorption behavior and the separation of uranium from the salt-lake water were studied also. The main contents of this thesis are the following three parts:The first is the preparation of the resin:a series of uranyl ion imprinted resins were synthesized by the way of suspension polymerization and precipitation polymerization using N,N-Dimethylallyl amine, 2-(Diethylamino)-ethyl Methacrylate, Diethyl allyphosphonate, 4-VinylPyridine respectively as functional monomer, styrene and divinylbenzene as crosslinker, uranyl ion as template and azobisisobutyronitrile as initiator. The selection and the optimal quantity of the functional monomer, crosslinker, initiator, etal., in the experimental were discussed. The SEM and EDS results of the imprinted resin were also shown.Second, we studied the effects of pH and shaking times on the adsorption of uranyl ions by the six resins using the static adsorption method, and determined the maximum adsorption capacity. The impact factors in the experiment and the results were discussed.Finally, the selective separation experiments of uranyl ions from the salt-lake water and the inter-crystal brine were carried out using the two resins(S4-NIP and S4-ⅡP). The results showed that the imprinted resin(S4-ⅡP) could selectively adsorb the trace uranium in the salt-lake water and the inter-crystal brine, and worth the further study for application. Non-imprinted resin(S4-NIP) could quantitatively adsorb uranyl ions from the salt-lake water and the inter-crystal brine, but the selectivity was obviously inferior to the S4-ⅡP.