Acid orange 10 dye biosorption by yeast isolated from polluted soil biomass
Abstract
The aim of this paper was to evaluate the ability of biosorption azo dye acid orange 10 of the biomass of a yeast isolated from soil contaminated with wastewater from the textile industry. In equilibrium studies was used 1,0 g L-1 of biomass, at 20 °C and pH 2,0 at initial concentrations between 10 mg L-1and 500 mg L-1. The biosorption isotherm was fitted by Langmuir model resulting in a value of 87,40 mg g-1 for saturated monolayer. To estimate the kinetic parameters, was considered an initial concentration of 100 mg L-1 at 10 °C, 20 °C, 30 °C to 40 °C, biosorption kinetics were well described by the kinetic model of pseudo-first order. Studies of diffuse reflectance infrared spectroscopy showed that the amide groups were mainly responsible for the biosorption.
Keywords: biosorption, azo dyes, wastewaters, acid orange 10
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