Iodide Ions Sorption on Polymer AV-17(Cl) and Sorbent AV-17(Bi)

Abstract

The iodide ions sorption from solutions of KI and KI in excess of KCl has been investigated. The strongly basic anion exchangers AV-17 in Clform and Varion AD in NO 3 form was used as sorbents. Also AV-17 polymer modifi ed with Bi(III)-containing compounds were used. The sorption was performed in static and dynamic conditions. Isotherms are approximated with BET sorption model. The sorption value of iodide ions in the KI solutions with KCl in excess is quite high. It was established that sorption of iodide ions in the form of polyiodide occurs both as a result of anion exchange and as a result of chemisorption.

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“…We have approximated the isotherms with the BET sorption model. Although the BET sorption model has been developed for gas or vapor sorption, it can be used with some approximation and in some sorption processes in solutions [23,24]. In this case, in the BET isotherm equation instead of P/Ps is introduced Ce/Cs, where P and Ps corresponds to the pressure and pressure of saturated solution.Thus the integrale BET equation used by us has the following form (Eq.9):…”