Sorption of radioactive iodine from aqueous medium at 25°C on granulated sorbents containing nitrates of d elements

Abstract

Sorption of various species of radioactive iodine from aqueous phase at 25°C with granulated sorbents based on silica gel of the MSKG type, containing nitrates of d elements, was studied. Sorbents containing Zn, Ni, Cu, and Co, both nonmodified and modified, have low distribution coefficients K d for 131I− and 131IO 3 − (at V/m = 1000, K d < 120 ml g−1). Whereas nonmodified sorbents do not noticeably sorb I2 from the aqueous phase (at V/m = 1000, K d < 10 ml g−1), their modified analogs adsorb molecular iodine species and have K d ∼ 170–250 ml g−1 at V/m = 1000. The study of sorption of radioactive iodine species with granulated sorbents containing silver nitrate showed that nonmodified sorbents have relatively low distribution coefficients K d for all species of radioactive iodine (at V/m = 1000, K d < 100 ml g−1). At the same time, the modified sorbents containing Ni and Ag sorb not only I2 (at V/m = 1000, K d ∼ 270 ml g−1) but also 131I− and 131IO 3 − ions from aqueous solutions (at V/m = 1000, K d ∼ 3100 and 1500 ml g−1, respectively).