Biosorption potential of Pennisetum glaucum has elaborated by investigating its kinetic behavior in nonlinear fashion. RMSE values supported the pseudo second order (PSO) and elovich model, but correlation coefficient (R2) values supported the PSO only. Study of intra-particle diffusion model (IPDM) and Boyd plots revealed the multi-linear diffusion pattern of the studied metal ions toward biosorbent. Initially, IPDM was found to be the rate-determining step, however boundary layer diffusion was found to be the slowest step later on. There was no correlation between calculated and experimental values of intercept, calculated by applying mass transfer model. Conclusive findings of Boyd plot supported the governing of biosorption process by film diffusion.Novelty StatementIn this work, biosorption potential of Pennisetum glaucum has been investigating in terms of kinetic studies in nonlinear fashion.Biosorbent is obtained from indigenous sources and its processing is easy, which in turns leads to its cost-effectiveness for better removal of toxic materials from waste water streams.All related theoretical investigations were summarized for showing biosorption efficiency of this novel material.
Keywords: Boyd plots; Kinetic studies; intra-particle diffusion model (IPDM); mass transfer model.