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Sorption of selected radionuclides from liquid radioactive waste by sorbents of biological origin: The alkaline earth alginates

Leon Fuks
Leon Fuks
 et 
Agata Oszczak-Nowińska
Agata Oszczak-Nowińska
   | 25 nov. 2021
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Article Category: Original Paper
Publié en ligne: 25 nov. 2021
Pages: 153 - 158
Reçu: 21 déc. 2020
Accepté: 12 févr. 2021
DOI: https://doi.org/10.2478/nuka-2021-0023
Mots clés
© 2021 Leon Fuks et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1

(a) Effect of contact time on the sorption of micro amounts of 241Am3+ onto calcium, strontium and barium alginate biosorbents. (b) Adsorption of micro amounts of Cs+, Sr2+ and Am3+ onto calcium alginate (pH 5 and room temperature).
(a) Effect of contact time on the sorption of micro amounts of 241Am3+ onto calcium, strontium and barium alginate biosorbents. (b) Adsorption of micro amounts of Cs+, Sr2+ and Am3+ onto calcium alginate (pH 5 and room temperature).

Fig. 2

(a) Adsorption of micro amounts of 241Am3+ onto calcium, strontium and barium alginate biosorbents vs. pH of the initial solution. (b) Adsorption of micro amounts of Cs+, Sr2+ and Am3+ onto calcium alginate (room temperature, contact time of the phases: 300 min).
(a) Adsorption of micro amounts of 241Am3+ onto calcium, strontium and barium alginate biosorbents vs. pH of the initial solution. (b) Adsorption of micro amounts of Cs+, Sr2+ and Am3+ onto calcium alginate (room temperature, contact time of the phases: 300 min).

Fig. 3

Am3+ complexes in aqueous solutions of different pH. Simulation computed using the Medusa program [11].
Am3+ complexes in aqueous solutions of different pH. Simulation computed using the Medusa program [11].

Fig. 4

Comparison of the adsorption of micro amounts (10−9 M) of the radionuclides onto calcium, strontium and barium alginate biosorbents (room temperature, pH 5, contact time of the phases: 300 min).
Comparison of the adsorption of micro amounts (10−9 M) of the radionuclides onto calcium, strontium and barium alginate biosorbents (room temperature, pH 5, contact time of the phases: 300 min).

Parameters of Freundlich, Langmuir and Dubinin–Radushkevich isotherms of Cs+, Sr2+ and Am3+ sorption on calcium, strontium and barium alginate sorbents (pH 5, time: 4 h, temperature: 21 ± 1°C)

Freundlich isotherm Langmuir isotherm Dubinin–Radushkevich isotherm
KF (dm3/mg) 1/n R2 amax KL (dm3/mg) R2 Xm (mg/g) B (mol2/J2) E (kJ/mol) R2
Calcium alginate
Am(III) 2.87 × 10−5 0.97 0.99 4.46 × 10−3 8.98 × 102 0.80 0.02 1.41 × 10−4 7.07 1.00
Sr(II) 4.68 × 10−7 1.00 1.00 2.99 × 10−3 5.00 × 102 0.77 0.02 1.41 × 10−4 7.07 1.00
Cs(I) 1.67 × 10−7 1.00 1.00 1.23 × 10−3 6.23 × 101 0.90 0.01 1.41 × 10−4 7.07 1.00
Strontium alginate
Am(III) 3.54 × 10−8 1.46 0.90 6.57 × 10−2 5.70 × 102 0.84 0.01 1.41 × 10−4 7.07 1.00
Sr(II) 2.50 × 10−6 1.05 1.00 2.99 × 10−3 2.27 × 102 0.96 0.01 1.41 × 10−4 7.07 1.00
Cs(I) 1.55 × 10−5 1.00 1.00 1.31 × 10−2 6.57 × 101 0.84 0.02 1.41 × 10−4 7.07 1.00
Barium alginate
Am(III) 3.17 × 10−6 1.34 0.91 6.75 × 10−2 7.70 × 102 0.83 0.01 1.41 × 10−4 7.07 1.00
Sr(II) 7.32 × 10−6 0.99 1.00 2.86 × 10−3 1.47 × 102 0.80 0.01 1.41 × 10−4 7.07 1.00
Cs(I) 1.67 × 10−5 1.00 1.00 1.30 × 10−2 6.31 × 101 0.83 0.02 1.41 × 10−4 7.07 1.00

The desorption percentage of Cs+, Sr2+ and Am3+ from the alginates studied. Standard deviation in the population of each determination: about ±0.1%

H2O HCl NaNO3 NaHCO3 Na2SO4
Calcium alginate
Am3+ 1.6% 4.4% 0.9% 7.8% 8.7%
Sr2+ 5.5% 12.5% 8.8% 9.9% 5.5%
Cs+ 2.2% 2.2% 2.2% 2.2% 2.2%
Strontium alginate
Am3+ 0.8% 1.0% 3.3% 7.3% 10.8%
Sr2+ 6.1% 15.8% 15.8% 30.4% 25.5%
Cs+ 2.4% 2.4% 2.4% 2.4% 2.4%
Barium alginate
Am3+ 0.5% 1.6% 2.0% 7.6% 8.9%
Sr2+ 8.3% 25.0% 17.6% 15.9% 7.3%
Cs+ 2.4% 2.4% 2.4% 2.4% 2.4%
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