Sorption of malachite green and Rhodamine-B dyes from aqueous solution by biomass waste: Kinetics, isotherm and thermodynamic studies

摘要

A biomass waste has been evaluated without chemical modification as low-cost effective adsorbent to remove Malachite Green (MG) and Rhodamine-B (RhB) dye srespectively from aqueous solution in batch experiment. The effect of certain parameters on the adsorption capacity has been investigated such as particle size, contact time, initial dye concentration, emp/emH, mass of the adsorbent and the effect of temperature. Isotherms study has been described by the Freundlich model which indicates that MG and Rh-B sorption process onto biomass is more described by good correlation coefficients (Rsup2/sup=0.867 and 0.953, respectively). Kinetic study shows that MG and Rh-B adsorption process follow pseudo-second order kinetics model. Furthermore, thermodynamic parameters reveal that the adsorption is spontaneous and endothermic.