Study of Adsorption Isotherms and Kinetic Models of Methylene Blue Adsorption on Moroccan Bagasse Waste

In this study, bagasse was used as a natural available raw biomass adsorbent for the removal of methylene blue (MB) from aqueous solutions.The equilibrium isotherms data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption and the kinetic data obtained at different concentrations were investigated using pseudo-first-order and pseudo-second-order kinetic models and for determining the applicability of various models.The kinetic approaches were based on the better correlation coefficient (R²) and the normalized standard deviation (∆q(%)) to find out the best-fit isotherm and kinetic equation.The different parameters of the best-fit model were calculated and discussed.Equilibrium data fitted well with the Langmuir model with maximum monolayer adsorption capacity of 41,67 mg/g at 25°C, the dimensionless factor, RL revealed the favorable nature of the isotherm.The adsorption kinetics data showed that this process can be described by the pseudo-second-order model with good correlation from which the rate constant and the adsorption capacity were determined.