Biosorption of Reactive Azo Dye from synthetic wastewater using low cost Dead Sludge Biomass

Abstract

Reactive azo dye biosorption behavior on dead sludge biomass was studied by sets of the equilibrium and time-based experiments under several conditions. Experimental data were estimated to find out kinetic characteristics. Biosorption process were found to follow the pseudo second-order kinetic model equation. Biosorption isotherm connect well with the Langmuir and Freundlich isotherm model and the maximum sorption capacity of dye estimated is 62.89 mg/g. Thermodynamic parameters were calculated based on Van't Hoff equation. The average change of standard enthalpy was -25.89 kJ/mol. Negative and values indicate the adsorption process for dye onto the studied dead biomass is exothermic and spontaneous. The average change of entropy was -64.52 J/mol.K also negative, which suggests a decrease in the freedom of the system. Equilibrium constant was estimated from Langmuir and Freundlich isotherm model constants