Imidazolium-Modified Silica Gel for Highly Selective Preconcentration of Ag(I) from the Nitric Acid Medium

The ion-exchange behavior of an organomineral material with an imidazolium (1-methyl-3-(prop-2-yn-1-yl)-1H-imidazol-3-ium bromide)-modified silica gel was studied for the extraction of Ag(I) from nitric acid media. The extraction from multicomponent systems containing Fe(III), Co(II), Ni(II), Cu(II)...

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Published inChemistry an international journal Vol. 4; no. 4; pp. 1702 - 1713
Main Authors Konshina, Dzhamilay N., Lupanova, Ida A., Konshin, Valery V.
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.12.2022
Subjects
Adsorption
Copper
Equilibrium
Experiments
Ion exchange
ionic liquid
Ions
Manganese
Mathematical analysis
mechanism of preconcentration
Nickel
Nitric acid
Reagents
Selectivity
Silica gel
X-ray fluorescence
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Summary:The ion-exchange behavior of an organomineral material with an imidazolium (1-methyl-3-(prop-2-yn-1-yl)-1H-imidazol-3-ium bromide)-modified silica gel was studied for the extraction of Ag(I) from nitric acid media. The extraction from multicomponent systems containing Fe(III), Co(II), Ni(II), Cu(II), Pb(II), and Mn(II) in 100- and 1000-fold molar excesses with respect to Ag(I) was shown to occur with high selectivity. Based on the data of X-ray diffraction and X-ray fluorescence spectroscopy for samples of modified silica gel, a mixed ion exchange–adsorption mechanism for the extraction of Ag(I) was proposed. The effect of the phase contact time and the concentration of nitric acid on the distribution coefficient of Ag(I) was studied. The selectivity factors of the extraction of Ag(I) from multicomponent systems containing foreign cations in 100- and 1000-fold molar excesses under steady-state and dynamic concentration conditions were calculated.
ISSN:2624-8549
2624-8549
DOI:10.3390/chemistry4040111