Molecules 2012, 17(1), 452-462; doi:10.3390/molecules17010452
A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542
1
Post-graduate Studies in Biological Sciences, Federal University of Pernambuco, 50.670-420 Recife, PE, Brazil
2
Department of Fundamental Chemistry, Federal University of Pernambuco, 50.670-901 Recife, PE, Brazil
3
Nucleus of Research in Environmental Sciences, Catholic University of Pernambuco, 50.050-900 Recife, PE, Brazil
*
Author to whom correspondence should be addressed.
Received: 12 December 2011 / Revised: 20 December 2011 / Accepted: 20 December 2011 / Published: 4 January 2012
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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.Keywords:
Cunninghamella elegans; adsorption; textile dyes; isotherms; ultrastructure; biomass
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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MDPI and ACS Style
Ambrósio, S.T.; Vilar Júnior, J.C.; da Silva, C.A.A.; Okada, K.; Nascimento, A.E.; Longo, R.L.; Campos-Takaki, G.M. A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542. Molecules 2012, 17, 452-462.
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