Synthesis And Characterization Of Modified Polydivinylbenzene And The Interaction With Uranyl Ions

In the new century, with the depletion of coal, oil and other traditional fossil fuels, nuclear energy, a representative of the new energy, has been developed rapidly. With the development of nuclear energy, the demand of uranium(Ⅵ) increased greatly, so the materials for uranium(Ⅵ) separation and enrichment were put forward higher requirements. Interpenetrating polymer network is a special polymer blends of two or more cross-linked polymer interpenetrating the supramolecular level formed. It can integrate a variety of cross-linked polymer properties, which indicated a broad application prospect. In this study, carboxyl-modified polydivinylbenzene interpenetrating copolymer was prepared by the using of solvothermal method with methacrylic acid and divinylbenzene, and its structural characteristics and adsorption properties of uranium(Ⅵ) were studied.The main contents of this thesis are as follows:(1) Carboxyl-modified polydivinylbenzene interpenetrating polymer network was prepared through solvothermal method and its structural properties were characterized in the means of N2 adsorption, scanning electron microscopy(SEM), transmission electron microscopy(TEM), infrared spectroscopy(FTIR), etc. The characterization results show that there is a large number of carboxyl functional groups on the surface of carboxyl-modified polydivinylbenzene, which indicated that the material has good hydrophilic; its interior is rich in pore structure which indicated a large specific surface area; specific surface area of the polymer decreased by the growth of methacrylic acid content.(2) By carrying out uranium(Ⅵ) adsorption experiments investigated modified polydivinylbenzene Adsorption of U(Ⅵ) is. Experimental results show that the uranium(Ⅵ) at the carboxyl-modified divinyl benzene adsorption on the pseudosecond order kinetic model; greater impact on the p H value and solid-liquid adsorption system than uranium(Ⅵ), while the background little effect on the adsorption of electrolyte concentration; at low p H conditions, uranium(Ⅵ) adsorption at the carboxyl-modified polydivinylbenzene mainly on the outer fit or ion exchange, while at high p H mainly with the inner layer or surface precipitation; carboxyl-modified polydivinylbenzene uranium(Ⅵ) adsorption capacity increases as the proportion of methacrylic acid reactant increases. The results indicated a good application prospect for the interpenetrating polymer in the field of radioactive waste processing.