| Autor: |
Maria das Graças Nunes Matos, Vivian Gouveia Diniz, Cesar Moraes de Abreu, Augusto Knoechelmann, Valdinete Lins da Silva |
| Zdroj: |
Adsorption; Feb2009, Vol. 15 Issue 1, p75-80, 6p |
| Abstrakt: |
Abstract Heavy metals can be removed from effluents and recovered using physico-chemical mechanisms as biosorption processes. In this work “Arribada” seaweed biomass was employed to assess its biosorptive capacity for the chromium (Cr3+) and lead (Pb2+) cations that usually are present in waste waters of plating industries. Equilibrium and kinetic experiments were conducted in a mixed reactor on a batch basis. Biosorption equilibrium and fluid-solid mass transfer constants data were analyzed through the concept of ion exchange sorption isotherm. The respective equilibrium exchange constants (K eqCr=173.42, K eqPb=58.86) and volumetric mass transfer coefficients ((k mCr a)′=1.13×10−3 s−1, (k mPb a)′=0.89×10−3 s−1) were employed for the dynamic analysis of Cr and Pb sorption in a fixed-bed flow-through sorption column. The breakthrough curves obtained for both metals were compared with the predicted values by the heterogeneous model (K eqCr=171.29, K eqPb=60.14; k mCr a=7.81×10−2 s−1, k mPb a=2.43×10−2 s−1), taking into account the mass transfer process. The results suggest that these algae may be employed in a metal removal/recovery process at low cost. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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