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

Molecules

Sandra T. Ambrósio¹  José C. Vilar Júnior¹  Carlos A. Alves da Silva¹  Kaoru Okada¹  Aline E. Nascimento¹  Ricardo L. Longo¹ 

[1] ¹Post-graduate Studies in Biological Sciences, Federal University of Pernambuco, 50.670-420 Recife, PE, Brazil ²Department of Fundamental Chemistry, Federal University of Pernambuco, 50.670-901 Recife, PE, Brazil ³Nucleus of Research in Environmental Sciences, Catholic University of Pernambuco, 50.050-900 Recife, PE, Brazil

关键词: Cunninghamella elegans;    adsorption;    textile dyes;    isotherms;    ultrastructure;    biomass;   

DOI  :  10.3390/molecules17010452

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.