Naslov
Removal of Ni2+ from aqueous solution by blast furnace sludge as an adsorbent

Autori
Rađenović, Ankica ; Malina, Jadranka ; Štrkalj, Anita

Izvornik
Desalination and water treatment (1944-3994) 21 (2010), 1/3; 286-294

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
blast furnace sludge ; Ni2+ ; adsorption ; Langmuir and Freundlich isotherms

Sažetak
The blast furnace sludge (BFS), by-product and waste material of steelmaking industry was utilized as an adsorbent for Ni2+ ions removal from aqueous solution. Chemical and mineralogical composition of BFS was examined by PIXE and XRD methods. The structural properties of BFS were characterized using BET and SEM methods. Batch experiments were conducted to evaluate the adsorption performance. The equilibrium adsorption level was determined to be a function of the solution concentration and temperature. Two simple kinetic models, pseudo-first and second-order, were used to investigate the adsorption mechanisms. The pseudo-second-order reaction kinetics provides the best correlation with the experimental data. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms. The characteristic parameters for each isotherm were found. The results obtained from Freundlich’s isotherm are slightly better than those obtained from Langmuir’s ishoterm. The thermodynamic parameters have been determined. The negative values of free energy change (ΔG) indicated the spontaneous nature of the adsorption of Ni2+ on blast furnace sludge and the positive values of enthalpy change (ΔH) suggested the endothermic nature of the adsorption process. The observed adsorption capacity for Ni2+ ions is a good indicator of BFS potential for its use in aqueous sorption system.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

Napomena
Glavni autori: Ankica Rađenović, Anita Štrkalj

POVEZANOST RADA