Sorption properties of Zr-CaMg and Ti-Ca-Mg phosphates in relation to Sr(II) ions
https://doi.org/10.29235/1561-8323-2022-66-2-167-175
Abstract
The synthesis of Zr-Ca-Mg and Ti-Ca-Mg phosphates of different composition was carried out and their sorption properties to Sr(II) ions were studied. The effect of pH of aqueous solutions, as well as of background electrolytes NaCl, CaCl2 , the seawater solution on the sorption-selective properties of phosphate sorbents was studied. The sorption isotherms and kinetic regularities of the Sr(II) ion removal were studied, the mathematical modeling of the experimental data using various models was carried out. It was found that Ti-containing sorbents had the greatest selectivity to Sr(II) ions. The maximum sorption capacity for the Ti-2 sample reached 196.5 mg/g (2.2 mmol/g). Samples of Zr-Ca-Mg and Ti-Ca-Mg phosphates had a high sorption capacity in the 0.1 M NaCl solution and in seawater. The sorption kinetics for all sorbents with a high degree of confidence (R2 ≥ 0.99) was described by a pseudo-second-order equation, due to the chemical interaction during the Sr(II) ions sorption. The study of the phase composition of sorption products indicated the ion exchange and chemisorption mechanism of the Sr(II) ions sorption.
Keywords
inorganic sorbents,
Zr-Ca-Mg phosphates,
Ti-Ca-Mg phosphates,
sorption isotherms,
sorption kinetics,
strontium
Supporting agencies: This work was financially supported by the National Academy of Sciences of Belarus (project no. 21/06-01)
About the Authors
A. I. Ivanets
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Ivanets Andrei I. – Corresponding Member, D. Sc. (Chemistry), Professor, Science Head of the Laboratory
9/1, Surganov Str., 220072, Minsk
I. L. Shashkova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Shashkova Irina L. – Ph. D. (Chemistry), Leading Researcher
9/1, Surganov Str., 220072, Minsk
N. V. Kitikova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Kitikova Nataliya V. – Ph. D. (Chemistry), Senior Researcher
9/1, Surganov Str., 220072, Minsk
N. V. Drazdova
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Drazdova Nataliya V. – Researcher
9/1, Surganov Str., 220072, Minsk
A. S. Dzikaya
Institute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Dzikaya Anastasiya S. – Junior Researcher
9/1, Surganov Str., 220072, Minsk
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