Abstract
In this study, Biosorption of Cr (VI) ions from aqueous solution by using biomass of Aspergillus niger was investigated. The effects of initial solution pH, biosorbent amount, contact time, initial concentration and temperature were explored. In batch experiments, the biosorption capacity of Cr (VI) decreased with increase in solution pH. The biosorption of Cr (VI) ions with pH range of 2.0-8.0 was found to be optimal at pH 2. Biosorption capacity of Cr (VI) ions decreased with increased biosorbent dosage. The bosorption capacity was increased with the increasing initial Cr (VI) concentration and temperature in studied range. The biosorption process followed the pseudo-second order kinetic model and the correlation coefficients from the pseudo-second order model were all higher than 0.9997 in all studied temperatures. These results suggest that the biomass of Aspergillus niger is a promising biosorbent for removal of Cr (VI) ions from the wastewater.
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