Affiliation:
1. National Commission of Atomic Energy
Abstract
Abstract
In the present work, the extent in which the presence of concomitant ions affects the removal capacity of uranyl ion by the natural mineral perlite was studied. By using synthetic solutions of uranyl nitrate in batch systems, the variables affecting the process, namely sorbent dose, contact time, pH and initial UO22+ concentration, were firstly investigated. The zeta potential and the sorption capacity of perlite, as well as relevant kinetics and thermodynamic parameters were measured.
Removals up to 90 % were achieved for a dose of 45 g of Pava L-1 and a concentration of U of 100 µg U L-1, of 74 % when the concentration was 1 mg U L-1, 60 % for 10 mg U L-1 and 25 % for a concentration of 50 mg U L-1. The best linear correlations in the adsorption isotherms were achieved by applying the Langmuir and Dubinin-Radushkevich models with adsorption energy of 8.72 kJ mol-1. The thermodynamic variables indicated the feasible, spontaneous and exothermic nature of the sorption of UO22+ by perlite.
The influence of concomitant ions, in decreasing order, was: Cs+ > Ba2+ > Mg2+ > K+ ~ Na+ > NH4+ > Ca2 +. The results of these investigations will allow determining the best treatment, weather the solution is an effluent from a nuclear plant or in case of environmental contamination.
Publisher
Research Square Platform LLC
Reference34 articles.
1. Batch kinetic study of sorption of methylene blue by perlite;Acemioğlu B;Chem. Eng. J.,2005
2. Removal of radio nuclides of the U- and Th- series from aqueous solutions by adsorption onto Polyacryamide-expanded perlite: Effects of pH, concentration and temperature;Akkaya R;Nucl. Instrum. Methods Phys. Res. Sect. A,2012
3. Removal of radioactive elements from aqueous solutions by adsorption onto polyacrylamide–expanded perlite: Equilibrium, kinetic, and thermodynamic study;Akkaya R;Desalination,2013
4. Zeta potential of unexpanded and expanded perlite samples in various electrolyte media;Alkan M;Microporous Mesoporous Mater,2005
5. Structure and Hydrolysis of the U(IV), U(V), and U(VI) Aqua Ions from Ab Initio Molecular Simulations;Atta-Fynn R;Inorg. Chem.,2012