Preparation Of Functional Polymer Film And Study On The Process Of Absorption Desorption Of Uranium From Seawater

In order to enchance the adhesive properties of inorganic materials and the functional film, recycled and hydrolysis resistance. KH-550, polyurethane (PU) prepolymer containing isocyanate groups and ferrocene groups, alpha-methyl methacrylate and acrylonitrile copolymer P(MAA-co-AN) with nitrile group and carboxyl group, were coated on the nickel by assembling in turn to prepare membrane electrode. Then the coating was reacted with hydroxylamine hydrochloride directly to make chelating electrode which contained amidoxime-groups. Chelating electrode was placed in uranyl nitrate solution and seawater to adsorb, the desorption was by electrochemical methods. The composition of the copolymer was measured by ATR and FTIR, surface morphology of the electrodes were characterized by SEM, the electrochemical behavior of the chelating electrode was discussed by cyclic voltammetry, and the uranium content was determined by spectrophotometer.(1) Film electrodes were prepared firstly.According to the conductivity and SEM figures, the best volume ratio of the KH-550,H2O and C2H5OH wasl2:56:32, the hydrolyzing time was about7minutes in room temperature. The assembly time in solution of KH-550, PU/benzene and P(MAA-co-AN)/benzene was2minutes,30minutes and32minutes,the best time of amine oximation was40minutes.(2) With chelating electrodes as work electrodes, stainless steel electrodes made in the lab as counter electrodes, calomel electrodes as reference electrodes and phosphate buffer solutionas(pH=6.89) supporting electrolyte, the chelating electrodes showed good electrochemical activities. Desorption voltage of the electrode adsorbed uranium in seawater was0.72V, and desorption voltage of the electrode adsorbed uranium in uranyl nitrate solutionwas0.73V.(3) Adsorption of uranium on the chelating electrodes contained two ways: electrostatic adsorption and chelating adsorption, and adsorption capacity of chelating electrodes was determined by the latter. Adsorption isotherm of chelating electrodes was:Γt=1.23×10-1c0.11.(4) The adsorption capacity of uranium in sea water on the chelating electrodes was0.51mgU·g-1after6hours. Adsorption capacity increased as the temperature rise in5℃to30℃, Arrhenius equation.(5) The surface of the chelating electrode was changed greatly in morphology characterized by SEM in front and behind of adsorption of uranium,and the adsorption of uranium on the chelating electrodes had achieved good results.