| ArticleName |
Sorption of rhodium(III) chloride complexes by silica chemically modified with γ-minopropyltriethoxysilane groups |
| ArticleAuthorData |
MIREA — Russian Technological University (RTU MIREA), Lomonosov Institute of Fine Chemical Technologies, Moscow, Russia:
T. M. Buslaeva, Professor of the Chair for Chemistry and Technology of Rare Elements Named After K. A. Bolshakov, Doctor of Chemical Sciences, e-mail: buslaevatm@mail.ru
E. V. Volchkova, Associate Professor, Chair for Chemistry and Technology of Rare Elements Named after K. A. Bolshakov, Сandidate of Chemical Sciences, e-mail: volchkovaev@bk.ru
JSC SPC Supermetal, Moscow Region, Russia:
I. V. Boryagina, Deputy Head of the Testing Laboratory, e-mail: irinaboryagina@mail.ru |
| Abstract |
The sorption of Rh(III) chlorocomplexes from hydrochloric acid solutions by silica chemically modified with -aminopropyltriethoxysilane groups was studied. Under static conditions, dependences of the sorption of the indicated ion on time, acid concentration, and temperature were obtained, and sorption isotherms were plotted. It was found that the time required for establishing constant sorption values for Rh(III) ions from a 1 mol/l HCl solution is 35–40 min. The maximum capacity of the sorbent with respect to rhodium(III) ions, which the authors managed to achieve, is 0.42 mmol/g. Under the same conditions, to achieve constant values of sorption of Pt(IV), Ir(III), and Ir(IV) ions, 10 min of phase contact is sufficient, while the sorption of ions of these metals does not exceed 0.06 mmol/g. Using a combination of spectral methods (IR and electron spectroscopy), it has been shown that in the process of establishing the sorption equilibrium, the Rh(III) hexachloride complex undergoes hydrolytic transformations, and an aquated ion of the [RhCl5(H2O)]2– composition passes into the sorbent phase, and with an increase in temperature — trans-[RhCl4(H2O)2]–. In this case, during the sorption of [PtCl6]2– and [IrCl6]2– ions, their complex state does not change, and they pass into the sorbent phase in the form of hexachloroplatinate (IV) ion and hexachloroiridate (IV) ion, respectively. Ir(III) ions behave similarly to Rh(III), aquatation processes occur, and the [IrCl4(H2O)2]– anion is sorbed. Since the chlorocomplexes of Ir(III) are adsorbed by the sorbent under study better than Ir(IV), in order to separate rhodium from iridium, one should not allow the reduction of Ir(IV) to a lower oxidation state. Experiments were carried out on the desorption of sorbed ions of platinum metals with a 10% ammonium chloride solution and a 3 mol/l HCl solution. It was found that the separation of the Rh(III)/Ir(IV) pair occurs at the elution stage.
The work was carried out under agreement with the Ministry of Education and Science of the Russian Federation No. 075-15-2021-689 dated 09/01/2021, unique identification number 2296.61321X0010, with the participation of N. M. Bodnar, Candidate of Chemical Sciences, senior researcher (RTU MIREA), and G. V. Erlich, Doctor of Chemical Sciences, professor of the Faculty of Chemistry of Moscow State University named after M. V. Lomonosov. |
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