A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542

doi:10.3390/molecules17010452

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Molecules 2012, 17(1), 452-462; doi:10.3390/molecules17010452

Article

A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542

Sandra T. Ambrósio^1,3

, José C. Vilar Júnior³

, Carlos A. Alves da Silva³

, Kaoru Okada³, Aline E. Nascimento³

, Ricardo L. Longo²

and Galba M. Campos-Takaki^3,*

+ Authors' affiliations

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

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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.

AMA Style

Ambrósio ST, Vilar Júnior JC, da Silva CAA, Okada K, Nascimento AE, Longo RL, Campos-Takaki GM. A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542. Molecules. 2012; 17(1):452-462.

Chicago/Turabian Style

Ambrósio, Sandra T.; Vilar Júnior, José C.; da Silva, Carlos A. Alves; Okada, Kaoru; Nascimento, Aline E.; Longo, Ricardo L.; Campos-Takaki, Galba M. 2012. "A Biosorption Isotherm Model for the Removal of Reactive Azo Dyes by Inactivated Mycelia of Cunninghamella elegans UCP542." Molecules 17, no. 1: 452-462.

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