Mechanisms of Cr(III) and Cr(VI) removal from aqueous solutions by sugar beet pulp

Zacaria Reddad (1) , Claire Gerente (1, 2) , Yves Andres (1, 2) , Pierre Le Cloirec (1, 2)

1 GEPEA - Laboratoire de génie des procédés - environnement - agroalimentaire
2 Mines Nantes - Mines Nantes

The removal of three- and hexavalent chromidium from aqueous solutions using sugar beet pulp as biosorbent substrate was performed. The kinetics of Cr(III) and Cr(VI) removal were studied at 20.0 +/- 0.5 degreesC and under various experimental conditions. The Cr(III) ions were adsorbed onto the biosorbent by ion-exchange mechanism with Ca2+ cations. The influence of solution pH was found to greatly affect the adsorption efficiency of Cr(VI). Cr(VI) removal was largely involved in a reduction mechanism with the appearance of Cr(III) ions in the solution.

Mots clés: sugar beet pulp; hexavalent chromium; reduction; trivalent chromium; ion-exchange

Domaines: Ingénierie de l'environnement

Zacaria Reddad, Claire Gerente, Yves Andres, Pierre Le Cloirec. Mechanisms of Cr(III) and Cr(VI) removal from aqueous solutions by sugar beet pulp. Environmental Technology, 2003, 24 (2), pp.257-264. ⟨10.1080/09593330309385557⟩. ⟨hal-00879460⟩