Features of Sorption Preconcentration of Noble Metal Ions with Sulfoethylated Amino Polymers

Алифханова, Л. М. к.; Lopunova, K. Ya.; Marchuk, A. A.; Petrova, Yu. S.; Пестов, А. В.; Неудачина, Л. К.

doi:10.1134/s0036023621060024

Cited by 3 publications

(2 citation statements)

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“…An increase in the degree of sulfoethylation of the aminopolymer matrix promotes a decrease in the sorption of platinum(IV) and, as a consequence, an increase in the selectivity of sorption of palladium(II) with respect to this ion. This effect is most significant for sorbents based on polyallylamine [20]. The conclusion about the mechanism of sorption was made in the works listed above without involving any research methods and, rather, out of habit, without expecting a different result.…”

Section: Modern Problems Of Coordination Chemistrymentioning

confidence: 98%

“…It was shown [18] that the selectivity of the target ion extraction increases upon passing from thionic to thiol sulfur. It has been established that the predominant mechanism of sorption of palladium(II) is complexation with functional groups of platinum(IV) sorbents, i.e., ion metathesis [11,19,20]. An increase in the degree of sulfoethylation of the aminopolymer matrix promotes a decrease in the sorption of platinum(IV) and, as a consequence, an increase in the selectivity of sorption of palladium(II) with respect to this ion.…”

Section: Modern Problems Of Coordination Chemistrymentioning

confidence: 99%

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Complexation during Sorption of Palladium(II) Ions by Chemically Modified Silica

Буслаева

Ehrlich

Volchkova

et al. 2022

Russ. J. Inorg. Chem.

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Complexation during the sorption of palladium(II) ions from chloride media by chemically modified silicas has been studied. Due to the use of mesoporous silicas with an average pore diameter of >10 nm for their synthesis, these sorbents do not change their volume in aqueous and organic media and have high mass transfer characteristics. The dependences of the sorption of Pd(II) ions from chloride solutions under static conditions as a function of time, HCl concentration, and Cl– ion have been obtained; sorption isotherms are constructed. Based on the experimental data, a conclusion has been made about the coordination mechanism of sorption, which has been proved by a combination of spectral methods (IR, UV-VIS, and X-ray photoelectron spectroscopy). The structure of sulfur-containing sorbents and their complexes with palladium has been modeled using the DFT M06 quantum-chemical method in the def2tzvp basis in the gas phase and taking into account the H2O solvent. The performed calculations make it possible to substantiate the nature of the dependence of sorption on the acid concentration and to confirm the formation of palladium(II) complexes with bidentate coordination of ligands in the silica phase modified with thiosalicylic and mercaptoacetic acids.

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Section: Modern Problems Of Coordination Chemistrymentioning

confidence: 98%