Data di Pubblicazione:
2010
Abstract:
Dyes adsorption on granular particles of lyophilised Cunninghamella elegans was characterized in
terms of adsorption isotherm and kinetics. The study refers to dyes of an acid bath for wool: Acid
Blue 62, Acid Red 266 and Acid Yellow 49. The dye concentration in model solutions – containing
a single dye or the three dyes all together in order to mimic the wastewater – was increased up to
about 500 mg/L. Tests showed that the maximum adsorption capacity of the biomass ranges
between 300 and 600 mgdye/gDM. Mutual interferences among dyes caused the reduction of the
adsorption capacity of the biomass towards the model wastewater. An experimental procedure for
the assessment of biosorption kinetics was developed in order to control the effects of the interphase
mass transfer on the biosorption rate. The biosorption kinetics were described by both pseudo-first
order and pseudo-second order models, depending on the saturation level of the sorbent, and was
characterized by a time scale of 1–10 min. The role of the molecular structures of the dyes was
discussed. In particular, both kinetics and equilibrium tests confirm that the biomass is more
selective towards AR266, probably for the high negative charge density of the –CF3 functional
group that can interact with –NHx active sites of the biomass.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Biosorption; Acid dyes; Kinetics; Fungal biomass
Elenco autori:
M.E. Russo; F. Di Natale; V. Prigione; V. Tigini; A. Marzocchella; G.C. Varese
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