Kinetic relationships of 90Sr sorption from aqueous solutions by carbonate-containing zirconium hydroxide Termoxid-3K

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Abstract

The kinetic relationships of the 90Sr sorption from fresh water by Termoxid-3K inorganic sorbent were studied. The influence of the solution stirring rate, strontium concentration, and temperature on the sorption rate constant, diffusion coefficients, and kinetic regime was investigated, and the experimental results obtained were modeled using models of diffusion and chemical kinetics. The strontium sorption onto T-3K sorbent has a two-stage character and proceeds in the internal diffusion mode with a limiting contribution of the chemisorption process in the first stage. The diffusion coefficients of strontium were 10–12–10–13 m2/s, and the activation energy in the first stage of sorption was 93.3 and at the second stage, 23.8 kJ/mol.

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About the authors

N. V. Belokonova

Yeltsin Ural Federal University

Email: av.voronina@mail.ru
Russian Federation, ul. Mira 19, Yekaterinburg, 620002

A. V. Voronina

Yeltsin Ural Federal University

Author for correspondence.
Email: av.voronina@mail.ru
Russian Federation, ul. Mira 19, Yekaterinburg, 620002

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2. Fig. 1. Kinetic dependences of strontium sorption by sorbent T-3K on the concentration of strontium in the solution, stirring speed 180 rpm.

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3. Fig. 2. Kinetic dependences of strontium sorption by sorbent T-3K on the stirring speed, strontium concentration in solution 0.1 mg/l.

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4. Fig. 3. Kinetic dependences in the coordinates of linear equations, υ = 900 rpm: a – pseudo-first-order models, b – pseudo-second-order models, c – Elovich models.

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5. Fig. 4. Kinetic dependences of strontium sorption by sorbent T-3K at different temperatures, strontium concentration 1 mg/l, υ = 180 rpm.

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6. Fig. 5. Dependence of the sorption rate constant on temperature.

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