Abstract
Adsorption isotherms of N,N,N’,N’-tetraoctyldiglycolamide (TODGA) on three brands of hypercrosslinked polystyrene (HCP) in a medium of supercritical CO2 were constructed using the gravimetric analysis method. It was shown that, under similar conditions (T = 313 K, P = 20 MPa), HCP marks MN200 and MN202 adsorb up to 0.55 and 0.59 mmol/g TODGA, respectively, which allows their use as a carrier of the ligand under consideration. The adsorption of TODGA on MN270 under similar conditions did not exceed 0.07 mmol/g. The effect of temperature and density of the medium on the adsorption of TODGA on MN200 was assessed. It was shown that a decrease in CO2 density under isothermal conditions leads to an increase in the maximum adsorption of TODGA. The solid extractant obtained on the basis of MN200 and TODGA showed noticeable extraction properties for Nd3+ compounds. The solid extractant based on MN202 turned out to be inactive in extraction, which is probably because the pore size of the matrix is too small for the complex to form.
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ACKNOWLEDGMENTS
This research was performed using the equipment of the JRC PMR IGIC RAS (Research Equipment Sharing Center of Physical Methods for Studying Substances and Materials, Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences).
We thank M.P. Tsyurupa (Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Moscow, Russia) for providing HCP samples.
Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the State Assignment of the Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences.
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Translated by V. Glyanchenko
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Kostenko, M.O., Galkina, O.I. & Parenago, O.O. Solid Extractants Based on Tetraoctyldiglycolamide and Hypercrosslinked Polystyrene: Production in Supercritical Carbon Dioxide. Russ. J. Phys. Chem. B 17, 1561–1568 (2023). https://doi.org/10.1134/S1990793123080031
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DOI: https://doi.org/10.1134/S1990793123080031