Abstract
The copolymers of styrene and maleic anhydride resin (PSt/MA) was synthesized by free radical polymerization and characterized by means of FTIR. It is shown that the PSt/MA copolymer has rather strong coordination ability to UO2 2+ ions by chelation with the carboxylate group, and the microstructures of the U(VI)-PSt/MA complexes can be well controlled. The influence factors on UO2 2+ ions were also investigated and described in detail, such as contact time, solid/liquid ratio, pH value, ethanol content, and initial concentration. It was found that the maximum adsorption quantity of UO2 2+ was 831 mg/g. Experiments show that PSt/MA can recover UO2 2+ ions with high adsorption selectively from a simulated industry solution containing Ca2+ and Mg2+ as impurities. The adsorption kinetic data were best described by the pseudo-second-order equation, indicating that the chemical adsorption was the rate-limiting step. And there are very good correlation coefficients of linearized equations for Langmuir model, which indicated that the sorption isotherm of the PSt/MA for UO2 2+ can be fitted to the Langmuir model. After five times of repeated tests for the hydrogel it still remained its excellent adsorption.
Published Version
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