Silicas Chemically Modified with Sulfur-Containing Groups for Separation and Preconcentration of Precious Metals Followed by Spectrometric Determination

Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation and preconcentration of precious metals. These adsorbents quantitatively extracted...

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Bibliographic Details
Published inMinerals (Basel) Vol. 11; no. 5; p. 481
Main Authors Losev, Vladimir, Elsuf’ev, Evgeney, Borodina, Elena, Buyko, Olga, Maznyak, Natalya, Trofimchuk, Anatoliy
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2021
Subjects
Adsorbents
Adsorption
Alkali metals
Calibration
chemically modified silicas
Concentrates (ores)
determination
Functional groups
Hydrochloric acid
Metal ions
Metals
Nitrogen
Noble metals
Ores
Particle size
Precious metals
preconcentration
Reagents
Scientific imaging
Selectivity
Separation
Silica
Spectrometry
Substitution reactions
Sulfur
sulfur-containing groups
Sulphur
Thiadiazoles
Thiourea derivatives
United States > US
Germany
Russia
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Summary:Silicas chemically modified with a number of sulfur-containing groups (mercaptopropyl, mercaptophenyl, dipropyl disulfide, thiadiazole thiol, dithiocarbamate and thiourea derivatives) were proposed for the separation and preconcentration of precious metals. These adsorbents quantitatively extracted precious metals from 0.5 to 4 M solutions of hydrochloric acid. It allowed their separation from high concentrations of non-ferrous, alkaline earth, alkali and some other related metals. The selectivity of separation of kinetically labile precious metal ions in ligand substitution reactions from kinetically inert ones depended on the nature of sulfur atom within the functional group of adsorbents and increased when passing from thione to thiol sulfur. Approaches for the preconcentration of precious metals using silicas chemically modified with sulfur-containing groups prior to their AAS, ICP-OES, and ICP-MS determination in ores, concentrates and their processing products were proposed. The correctness of the developed methods was confirmed by the analysis of certified reference materials.
ISSN:2075-163X
2075-163X
DOI:10.3390/min11050481