IQUIMEFA   05518
INSTITUTO QUIMICA Y METABOLISMO DEL FARMACO
Unidad Ejecutora - UE
artículos
Título:
Immobilized chitosan as biosorbent for the removal of Cd(II),
Autor/es:
G.J. COPELLO; F. VARELA; R. MARTÝ´NEZ VIVOT; L.E. DÍAZ
Revista:
BIORESOURCE TECHNOLOGY
Editorial:
Elsevier
Referencias:
Año: 2008 p. 6538 - 6544
ISSN:
0960-8524
Resumen:
The generation of layer-by-layer silicatechitosan composite biosorbent was studied. The films were evaluated on its stability regarding
the polymer leakage and its capability in the removal of Cd(II), Cr(III) and Cr(VI) from an aqueous solution. SEM, EDAX and
ATR-IR techniques were applied for material characterization. Silicatechitosan films with a final layer of silicate demonstrated chitosan
retention and had better sorption capacities than those without it. For metal species, such as Cd(II) and Cr(III), the greatest adsorption
was obtained when the pH of the solution was 7. When Cr(VI) was evaluated, pH 4 was the optimal for its adsorption. Langmuir and
Freundlich isotherms were modeled for the equilibrium data. An 80% of the adsorbed metal was recovered by HNO3 incubation. This
non-covalent immobilization method allowed chitosan surface retention and did not affect its adsorption properties. The use of a coated
surface would facilitate sorbent removal from medium after adsorption.
non-covalent immobilization method allowed chitosan surface retention and did not affect its adsorption properties. The use of a coated
surface would facilitate sorbent removal from medium after adsorption.
non-covalent immobilization method allowed chitosan surface retention and did not affect its adsorption properties. The use of a coated
surface would facilitate sorbent removal from medium after adsorption.
3 incubation. This
non-covalent immobilization method allowed chitosan surface retention and did not affect its adsorption properties. The use of a coated
surface would facilitate sorbent removal from medium after adsorption.