| Autor: |
Rusu L; Faculty of Engineering, 'Vasile Alecsandri' University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania., Grigoraș CG; Faculty of Engineering, 'Vasile Alecsandri' University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania., Simion AI; Faculty of Engineering, 'Vasile Alecsandri' University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania., Suceveanu EM; Faculty of Engineering, 'Vasile Alecsandri' University of Bacau, 157 Calea Mărăşeşti, 600115 Bacau, Romania., Istrate B; Mechanical Engineering Faculty, 'Gheorghe Asachi' Technical University from Iasi, 43 Mangeron Blvd., 700050 Iasi, Romania., Harja M; Faculty of Chemical Engineering an Environmental Protection 'Cristofor Simionescu', 'Gheorghe Asachi' Technical University from Iasi, 71 A Mangeron Blvd., 700050 Iasi, Romania. |
| Abstrakt: |
Two types of biosorbents, based on Saccharomyces pastorianus immobilized in calcium alginate, were studied for the removal of pharmaceuticals from aqueous solutions. Synthetized biocomposite materials were characterized chemically and morphologically, both before and after simulated biosorption. Ethacridine lactate (EL) was chosen as a target molecule. The process performance was interpreted as a function of initial solution pH, biosorbent dose, and initial pharmaceutical concentration. The results exhibited that the removal efficiencies were superior to 90% for both biosorbents, at the initial pH value of 4.0 and biosorbent dose of 2 g/L for all EL initial concentrations tested. Freundlich, Temkin, Hill, Redlich-Peterson, Sips, and Toth isotherms were used to describe the experimental results. The kinetic data were analyzed using kinetic models, such as pseudo-first order, pseudo-second order, Elovich, and Avrami, to determine the kinetic parameters and describe the transport mechanisms of EL from aqueous solution onto biosorbents. Among the tested equations, the best fit is ensured by the pseudo-second-order kinetics model for both biosorbents, with the correlation coefficient having values higher than 0.996. The many potential advantages and good biosorptive capacity of Saccharomyces pastorianus biomass immobilized in calcium alginate recommend these types of biocomposite materials for the removal of pharmaceuticals from aqueous solutions. |
