Funct. Mater. 2022; 29 (1): 129-134.

doi:https://doi.org/10.15407/fm29.01.129

Extraction of silver ions from aqueous solutions by MnO(OH) particles

A.P.Krasnoperova1, N.V.Efimova1, G.D.Yukhno1, D.S.Sofronov2, A.M.Lebedinsky1,2

1V.N.Karazin Kharkiv National University, 4 Svobody Sq., 61022 Kharkiv, Ukraine 2State Scientific Institution "Scientific and Technological Complex" Institute of Single Crystals", National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine

Abstract: 

The sorption properties of the manganese oxyhydroxide MnO(OH) particles relative to Ag(I) ions in the pH range of 2-8 have been investigated. It was found that large agglomerates are formed in MnO(OH) consisting of particles no larger than 150 nm, which characterizes it as a macroporous sorbent. Kinetic studies have shown that sorption equilibrium on MnO(OH) particles is achieved in 50-60 minutes. It is shown that the efficiency of extraction of silver ions increases to the 78 % with increasing pH (at pH = 6). It was found that the value of the activation energy for the sorption of silver ions is 8.5 kJ/mol; this indicates the ion-exchange nature of sorption.

Keywords: 
sorption, silver ions, manganese oxyhydroxide, degree of extraction, kinetics of sorption, sorption isotherms.

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