Mario Nikola Mužek

Fly ash-based geopolymeric adsorbent for copper ion removal from wastewater

AbstractThe batch experiments were carried out to study the removal of copper ions from aqueous solutions by sorption process on geopolymer synthesized from fly ash (FA). The influence of solute concentration and temperature on the sorption process were examined at constant particle size and the sorption capacity of copper ions increases with the initial concentration and temperature. Several kinetic models were used to test the experimental kinetic data: Lagergren pseudo-first-order, the pseudo-second-order (Ho), and Elovich models were analyzed using nonlinear regression technique. A kinetic study has shown that the best fit is achieved when the Ho model was applied. The results obtained indicate that geopolymer synthesized from FA has excellent adsorption ability and could be used as an efficient material for the sorption of copper ions.

Kinetic studies of cobalt ion removal from aqueous solutions using fly ash-based geopolymer and zeolite NaX as sorbents

ABSTRACT This study explored the cobalt ions removal efficiency from aqueous solutions by the sorption process on geopolymer and zeolite NaX. The influence of concentration and temperature on the sorption process was examined. FTIR and SEM analyses were conducted to elucidate the structure of sorbents. An additional goal was to test the experimental kinetic data using several kinetic models. A kinetic study has shown that the best fit is achieved when the Blanchard model was applied, suggesting that the sorption of cobalt ions on geopolymer and zeolite NaX is a second-order reaction.