Kazem Mahanpoor - Department of Chemistry , Faculty of Science, Islamic Azad University of Arak
Jafar Adineh - Faculty of Agriculture, Islamic Azad University of Arak

Organic dyes constitute one of the larger groups of pollutants in wastewater released from textile industries. several method exit for removal of dye pollutants from weastwater. Biosorption is becoming a promising alternative to replace or supplement the present dye removal processes from dye wastewater. In this study, removal of an anthraquinone dye, Acid blue 25, from an aqueous solution by biosorption on dead fungus, Aspergillus niger, was investigated. The initial pH of the dye solution strongly affected the chemistry of both the dye molecules and fungal biomass in an aqueous solution. The effective pH was 6.5. Kinetic studies showed that the biosorption of Acid blue 25on fungal biomass was a fast process. Equilibrium was reached in 35 min.

Aspergillus niger; Acid blue 25; Biosorption