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Microstructural and Equilibrium Adsorption Study of the System of Waste Foundry Molding Sand/Cu (II) Ions

Strkalj A., Glavas Z., Slokar L.

Archives of Metallurgy and Materials

2016

Vol. 61, iss. 4

1805--1812

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 ΔG° 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 ΔH° is − 4.16 kJ/mol and the value of ΔS° 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.

Wyznaczanie równowag sorpcyjnych dla sorpcji jonów Cu(II) przez granulki alginianowe

Kwiatkowska S., Wójcik M., Grubecki I.

Inżynieria Chemiczna i Procesowa

2001

T. 22, z. 3C

849--854

Badano sorpcję jonów Cu(II) z rozcieńczonych roztworów wodnych przez granulki alginianowe. Wyznaczono izotermy równowagi dla szerokiego zakresu stężeń alginianów w granulkach. Stwierdzono, że równanie Langmuira dobrze opisywało dane doświadczalne, a stale równowagowe zależały od stężenia alginianu w granulkach.

The sorption of Cu(II) ions from dilute aqueous solutions by alginate beads was studied. Equilibrium isotherms were determined for wide range of alginate concentrations in the beads. It was found that the Langmuir equation described the experimental data well and the equilibrium constants depended on concentration of alginate in the beads.