THE STUDY OF HEAVY METAL ION SORPTION KINETICS

Abstract

Phosphorus-containing polymeric sorbent based on butadiene-styrene rubber was used to remove zinc, iron and chromium ions from water. The research was carried out to study the sorption characteristics by determining the effects of various parameters, such as the pH of the solution, the initial concentration of metal ions, the sorbent mass, the phase contact time, and temperature. The regularities of the kinetics of the sorption of zinc, iron and chromium ions on the phosphorus-containing sorbent synthesized on the basis of butadiene-styrene rubber were studied. On the basis of the results it was defined that the process of sorption of zinc, iron and chromium ions on the cation exchanger proceeds by an ion-exchange mechanism. The kinetics of this process is a combination of external and internal diffusion kinetics (with some predominance of external diffusion kinetics) and is better described by the pseudo-second order reaction model. In addition, a certain contribution to the overall speed of the process is made by the interaction of the sorbed ions with the functional groups of the cation exchanger. Keywords: phosphorus-containing cation exchanger, zinc, iron, chromium, sorption, kinetics.