Naslov
Microstructural and equilibrium adsorption study of the system of waste foundry molding sand/Cu(II)ions

Autori
Štrkalj, Anita ; Glavaš, Zoran ; Slokar, Ljerka

Izvornik
Archives of metallurgy and materials (1733-3490) 61 (2016), 4; 1805-1812

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

Ključne riječi
waste foundry molding sand ; Cu (II) ions ; adsorption ; SEM/EDS analysis

Sažetak
This paper deals with the waste foundry molding sand which originally comes from the casting production. Adsorption of Cu (II) ions on the waste foundry molding sand was studied. Experimental data were processed using adsorption isotherms. obtained results show that the experimental data are best described by the Langmuir isotherm. The following adsorption capacities are obtained: 7.153 mg/g to 293 k, 8.403 mg/g at 333 k and 9.208 mg/g at 343 k. The kinetics and thermodynamics of the process were analysed. The obtained results indicate that the adsorption process takes place according to the pseudo second order kinetic model with the following constants: 0.438 g/mg min at 293 k, 0.550 g/mg min at 333 k and 1.872 g/ mg min at 343 K. The following values of Δ G° were obtained: - 95.49 j/mol at 293 k, - 736.99 j/mol at 333 k and - 1183.46 J/mol at 343 K. The value of Δ H° is - 4.16 kJ/mol and the value of Δ S° is 15.17 j/molk. These results were confirmed by microscopic examinations. The results indicate that the adsorption process of Cu (II) ions on waste foundry molding sand is possible. Results of microscopic examinations show the homogeneity of the surface, which is proof of the chemisorption. Cu (II) ions on the surface of the waste foundry molding sand were detected after adsorption by EDS analysis, which proves the existence of the adsorption process.

Izvorni jezik
Engleski

Znanstvena područja
Metalurgija

Napomena
Potpora- Štrkalj;
Glavni autori: Anita Štrkalj, Ljerka Slokar

POVEZANOST RADA