Author(s): Sandra T. Ambrósio | José C. Vilar Júnior | Carlos A. Alves da Silva | Kaoru Okada | Aline E. Nascimento | Ricardo L. Longo | Galba M. Campos-Takaki
Journal: Molecules
ISSN 1420-3049
Volume: 17;
Issue: 1;
Start page: 452;
Date: 2012;
Original page
Keywords: Cunninghamella elegans | adsorption | textile dyes | isotherms | ultrastructure | biomass
ABSTRACT
The biosorption of three reactive azo dyes (red, black and orange II) found in textile effluents by inactive mycelium of Cunninghamella elegans has been investigated. It was found that after 120 hours of contact the adsorption led to 70%, 85%, 93% and 88% removal of reactive orange II, reactive black, reactive red and a mixture of them, respectively. The mycelium surface was found to be selective towards the azo dyes in the following order: reactive red > reactive black > orange II. Dye removal from a mixture solution resulted in 48.4 mg/g retention by mycelium and indicated a competition amongst the dyes for the cellular surface. A Freundlich adsorption isotherm model exhibited a better fit, thus suggesting the presence of heterogeneous binding sites. Electrondense deposits observed on the mycelium ultrastructure suggest that the dyes are mainly retained under the cellular surface of the inactive biomass of C. elegans.
Journal: Molecules
ISSN 1420-3049
Volume: 17;
Issue: 1;
Start page: 452;
Date: 2012;
Original page
Keywords: Cunninghamella elegans | adsorption | textile dyes | isotherms | ultrastructure | biomass
ABSTRACT
The biosorption of three reactive azo dyes (red, black and orange II) found in textile effluents by inactive mycelium of Cunninghamella elegans has been investigated. It was found that after 120 hours of contact the adsorption led to 70%, 85%, 93% and 88% removal of reactive orange II, reactive black, reactive red and a mixture of them, respectively. The mycelium surface was found to be selective towards the azo dyes in the following order: reactive red > reactive black > orange II. Dye removal from a mixture solution resulted in 48.4 mg/g retention by mycelium and indicated a competition amongst the dyes for the cellular surface. A Freundlich adsorption isotherm model exhibited a better fit, thus suggesting the presence of heterogeneous binding sites. Electrondense deposits observed on the mycelium ultrastructure suggest that the dyes are mainly retained under the cellular surface of the inactive biomass of C. elegans.
