RAS Chemistry & Material ScienceЖурнал физической химии Russian Journal of Physical Chemistry

  • ISSN (Print) 0044-4537
  • ISSN (Online) 3034-5537

SORPTION OF RARE EARTH ELEMENT CATIONS BY SiO-TiO-CROWN ETHER COMPOSITES

PII
S3034553725100126-1
DOI
10.7868/S3034553725100126
Publication type
Article
Status
Published
Authors
Volume/ Edition
Volume 99 / Issue number 10
Pages
1556-1563
Abstract
The immobilization of crown ethers (dibenzo-18-crown-6, dibenzo-21-crown-7, dibenzo-24-crown-8) during the sol-gel synthesis of mixed oxides SiO-TiO enabled the preparation of composites that strongly retain the organic molecule within the inorganic matrix, as confirmed by IR spectroscopy and elemental analysis. The sorption properties toward rare earth element (REE) cations were studied under acidic and neutral conditions. Transitioning from the original oxides and crown ethers to their composites significantly increased both the sorption efficiency (S, %) and the sorption capacity (Q, mg/g). For the dibenzo-18-crown-6-SiO-TiO composite, the sorption efficiency of REE cations from dilute solutions (2×10 mol/dm) reached 89.1–95.1%, and the sorption capacity from concentrated REE solutions (0.1 mol/dm) was 6.1–34.5 mg/g. The sorption process of lanthanum cations by the dibenzo-18-crown-6-SiO-TiO composite was analyzed using Langmuir (R = 0.9915), Freundlich (R = 0.8745), Temkin (R = 0.9506), and Dubinin-Radushkevich (R = 0.9754) isotherm models.
Keywords
редкоземельные элементы композиты краун-эфиры SiO-TiO сорбенты изотермы адсорбции
Date of publication
31.03.2025
Year of publication
2025
Number of purchasers
0
Views
25

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