Synthesis of birnessite-type manganese oxide for removal of strontium ions from contaminated water

Abstract

Manganese oxide is perspective material for selective removal of strontium ions from multicomponent solutions. Birnessite-type manganese oxide with the hexagonal disordered structure has been synthesized in the form of round microparticles. The synthesized samples have been tested for the removal of strontium ions from mono - and multicom-ponent solutions. It was found that birnessite can effectively remove strontium ions from monocomponent solutions. The presence of alkaline metal ions (up to ~ 0.3 M) in the multicomponent solutions has no significant effect on adsorp-tion; however, calcium ions (Ca/Sr ~ 30/1) lead to the considerable decrease in adsorption. The rather high adsorption parameters received in the experimental work allow to consider the synthesized birnessite as a sorbent with high selec-tivity towards strontium ions.