CODEN: RJCABP BIOSORPTION CHARACTERISTICS OF Cr BIOSORPTION CHARACTERISTICS OF Cr 6+ FROM AQUEOUS SOLUTIONS BY PINUS SYLVESTRIS L. TIMBER FILLINGS

ABSTRACT Pinus Slyvestris L. timber fillings were boiled and utilized as a biosorbent for the removal of Cr 6+ from a synthetic wastewater. The Cr 6+ removal increased from 34.8% to 69.41% as biosorbent dosage increased from 3.0 to 8.0 g/L, while the uptake of Cr 6+ decreased from 6.09 mg/g to 4.78 mg/g as the biosorbent dosage increased from 3.0 to 8.0 g/L, when the initial Cr 6+ concentration was 50 mg/L. The experimental equilibrium data were well described by both the Langmuir and Dubinin-Radushkevich adsorption isotherm models. Based on R 2 values, the Langmuir model fitted the equilibrium biosorption data best, confirming monolayer adsorption of Cr 6+ onto the biosorbent surface. The biosorption kinetics of Cr 6+ was best described by pseudo-second-order kinetics since at all concentrations, the R 2 values were higher than the corresponding pseudo-first order values. The overall results indicated that P. Slyvestris L. is a promising biosorbent for Cr 6+ removal from dilute aqueous solutions