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 solu-tions. 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 multicomponent solutions. It was found that birnessite can effectively remove strontium ions from mono-component solutions. The presence of alkaline metal ions (up to ~ 0.3 M) in the multicomponent solutions has no significant effect on adsorption; however, calcium ions (Ca/Sr ~ 30/1) lead to the considerable decrease in ad-sorption. The rather high adsorption parameters received in the experimental work allow to consider the synthe-sized birnessite as a sorbent with high selectivity towards strontium ions.

Keywords

• manganese dioxide
• birnessite
• adsorption
• selectivity
• 90Sr