Adsorption of Rhodamine B from single, binary and ternary dye systems using Sawdust of Parkia biglobosa as adsorbent: Isotherm, kinetics and thermodynamics studies

Giwa A. A, Oladipo M. A. and A

Abstract

This study investigates the use of sawdust of Parkia biglobosa for the removal of Rhodamine B from single, binary and ternary dye systems in aqueous solution so as to determine the effects of the composition of the solution on adsorption process. The sawdust was characterized using Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR) spectrophotometry, X-Ray diffraction and pH point of zero charge. Batch adsorption experiments were carried out to investigate the isotherm, kinetics and thermodynamics of the adsorption processes. The adsorption process was described by Freundlich isotherm (R2 0.99) in single system, Langmuir isotherm (R2 0.99) in binary system and Temkin isotherm in ternary system. The adsorption process in the three systems investigated were described by pseudo second order kinetics and were all spontaneous (negative DG) but endothermic.