Study of the influence of the storage conditions of MnO(OH) particles on their sorption properties

Abstract

The influence of storage time of MnO(OH) particles under various storage conditions (air, argon and moisture) on efficiency of the removal and sorption capacity towards strontium, europium, and cobalt has been studied. The purpose of our work is to study the effect of the storage time of MnO(OH) particles under different conditions on extraction efficiency and sorption capacity with respect to strontium, europeium and cobalt. It has been found using IR spectroscopy and chemical analysis that there are no changes in the chemical composition of the powders with varying storage conditions. The values of the specific surface area for the samples stored over 12 months decrease from 360 to 260 m²·g^-1. Efficiency of the removal by MnO(OH) particles is more than 90 % with respect to all metals investigated and remains constant regardless of conditions and storage time. It has been shown that within the first six months of storage, the sorption capacity of MnO(OH) particles stored in the air decreases by 2 times for europium and strontium ions and by 5 times for cobalt ions. After further storage up to 1 year, sorption capacities towards strontium, europium, and cobalt remain constant and are 25, 30, and 50 mg·g^-1, respectively. For particles stored in argon atmosphere and in a wet state, similar dependence of sorption capacity towards cobalt ions is observed