Sorption properties of polymeric beads and films containing tetraoctyl diglycolamide towards europium (III) ions

doi:10.26565/2220-637X-2020-35-01

Victoria Varchenko SSI “Institute for Single Crystals” of NAS of Ukraine, 60, Nauky ave., Kharkiv, 61070, Ukraine https://orcid.org/0000-0002-7369-1637
Zinaida Bunina SSI “Institute for Single Crystals” of NAS of Ukraine, 60, Nauky ave., Kharkiv, 61070, Ukraine https://orcid.org/0000-0002-8639-958X
Kateryna Bryleva SSI “Institute for Single Crystals” of NAS of Ukraine, 60, Nauky ave., Kharkiv, 61070, Ukraine https://orcid.org/0000-0002-8903-4922
Konstantin Belikov SSI “Institute for Single Crystals” of NAS of Ukraine, 60, Nauky ave., Kharkiv, 61070, Ukraine https://orcid.org/0000-0002-1682-6064
Ilias Shcherbakov SSI “Institute for Single Crystals” of NAS of Ukraine, 60, Nauky ave., Kharkiv, 61070, Ukraine https://orcid.org/0000-0002-9450-2153
Andriy Drapailo Institute of Organic Chemistry of NAS of Ukraine, 5, Murmanska Str., Kyiv, 02000, Ukraine https://orcid.org/0000-0002-8701-1380
Vitaly Kalchenko Institute of Organic Chemistry of NAS of Ukraine, 5, Murmanska Str., Kyiv, 02000, Ukraine https://orcid.org/0000-0002-0325-7544

DOI: https://doi.org/10.26565/2220-637X-2020-35-01

Keywords: europium, sorption, TODGA, triacetate cellulose, styrene-divinylbenzene copolymer, removal rate

Abstract

The article presents results obtained during investigation of Eu(III) ion removal from aqueous solutions using triacetate cellulose films and styrene-divinylbenzene copolymer beads containing tetraoctyl diglycolamide (TODGA). A simple method for manufacturing films containing up to 50 % w/w TODGA is provided. Solution acidity effect on the removal rate of Eu(III) ions was studied. Maximum removal of Eu(III) ions was obtained in nitric acid solutions with concentrations of 1-6 mol/l. Additionally, increase in the europium removal rate is also observed at pH > 2 for beads and in the pH range of 2 to 4 for films. In the former case increase in the removal rate is explained by increase in the nitrate ion concentration in the solution and Eu(NO₃)₃(TODGA)₃ complex formation, and in the latter case – by decrease in TODGA protonation rate with рН growth. Observed trends indicate a high similarity in surface sorption mechanisms between the materials studied. Sorption equilibrium of Eu(III) ions onto the styrene-divinylbenzene copolymer beads impregnated with TODGA is adequately fitted to Langmuir sorption isotherm. The maximum sorption capacity of this material for Eu(III) removal from solutions with nitric acid concentration of 1 mol/l is 7.4 mg/g. It has been found that the maximum removal rate of Eu(III) ions by the triacetate cellulose films is achieved for TODGA content in the films ≥ 40 % w/w. The possibility of selective europium sorption from natural water using both beads and films is shown. Although cations present in natural water do not bind to sorbents studied, there is still slight deterioration in sorption properties when moving from model solutions to natural water. Complete desorption of Eu(III) ions from the film surface is achieved by washing three times with an EDTA solution, рН = 6.8. Prepared films can be reused for Eu(III) ion removal.

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