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Title: Cadmium uptake by algal biomass in batch and continuous (CSTR and packed bed column) adsorbers
Authors: Vilar, Vitor
Santos, Sílvia
Martins, Ramiro
Botelho, Cidália
Boaventura, Rui
Keywords: Biosorption
Algal biomass
Packed bed column
Issue Date: 2008
Publisher: Elsevier
Citation: Vilar, Vitor; Santos, Sílvia; Martins, Ramiro; Boaventura, Rui (2008) - Cadmium uptake by algal biomass in batch and continuous (CSTR and packed bed column) adsorbers. Biochemical Engineering Journal. ISSN 1369-703X. 42:3, p. 276-289
Abstract: In this work, the properties of marine algae Gelidium, algal waste from agar extraction industry and a composite material were investigated for cadmium(II) biosorption. Equilibrium experiments were performed at three pH values (4, 5.3 and 6.5). Equilibrium data were well described by the Langmuir and Langmuir–Freundlich isotherms. Two models predicting the pH influence in the cadmium biosorption (discrete and continuous models) have been developed in order to better describe the equilibrium. The continuous model also considers a heterogeneous distribution of carboxylic groups, determined by potentiometric titration. The results of batch kinetic experiments performed at different pH values were well fitted by two mass transfer models and the homogeneous diffusion coefficients for the cadmium ions inside the biosorbentwere obtained. Continuous stirred tank reactor (CSTR) and packed bed column configurationswere also examined for the biosorption of cadmium ions. A strong acid (0.1MHNO3)was used as eluant to regenerate the biosorbents in the column. Several mass transfer models were applied with success to describe the biosorption process in batch mode, CSTR and fixed bed column.
ISSN: 1369-703X
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Appears in Collections:DTQB - Artigos em Revistas Indexados ao ISI/Scopus

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