Microstructural and equilibrium adsorption study of the system of waste foundry molding sand/Cu(II)ions (CROSBI ID 242792)
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Podaci o odgovornosti
Štrkalj, Anita ; Glavaš, Zoran ; Slokar, Ljerka
engleski
Microstructural and equilibrium adsorption study of the system of waste foundry molding sand/Cu(II)ions
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.
waste foundry molding sand ; Cu (II) ions ; adsorption ; SEM/EDS analysis
Potpora- Štrkalj; Glavni autori: Anita Štrkalj, Ljerka Slokar
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Podaci o izdanju
61 (4)
2016.
1805-1812
objavljeno
1733-3490
2300-1909
10.1515/amm-2016-0292