Biosorption of acid red from aqueous solutions onto peanut shell as a low-cost

Abstract

Biosorption of Acid Red from aqueous solutions by peanut shell as a low-cost biosorbent was investigated as a function of initial pH, initial biomass concentration. The kinetics and equilibrium of biosorption were examined in detail. Three kinetic models (pseudo-first order, pseudo-second order, and internal diffusion order model) were used to connect data and to determine the kinetic parameters. Two well-known adsorption isotherms were chosen to describe the biosorption equilibrium. The experimental data were analyzed using two two-parameter models (Langmuir and Freundlich). The equilibrium biosorption isotherms showed that peanut shells possess high affinity and sorption capacity for Acid Red, maximum biosorption capacities of 9.8232mg/g. All results showed that peanut shells biomass is an attractive, alternative low-cost biosorbent for removal of heavy Acid Red from aqueous media.