Abstract
Abstract Schiff's base chitosan composite with magnetic properties has been prepared and investigated. The modification process took place through the reaction between chitosan and polymeric Schiff's base of thiourea/glutaraldehyde in the presence of magnetite. The sorption characteristics of the composite towards UO 2 2 + at different experimental conditions were carried out by means of batch and column methods. The composite showed high affinity and fast kinetics for the sorption of UO 2 2 + ions, the sorption capacity reached 2.32 mmol/g at 25 °C. Various parameters such as pH, agitation time, UO 2 2 + concentration and temperature had been studied. The kinetics and thermodynamic behavior of the sorption reaction were defined. These data indicated an exothermic and spontaneous sorption process, and kinetically followed pseudo-second order model, Fickian diffusion low and Elovich equation. The uptake of UO 2 2 + was slightly influenced by the increase of ionic strength. Breakthrough curves for the removal of UO 2 2 + were studied at different flow rates and bed heights. The critical bed height for the studied column was found to be 0.656 cm at flow rate of 4 mL/min. Hydrochloric acid (0.2 M) was used for desorbing UO 2 2 + from loaded composite: desorption yield as high as 97% was obtained.
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