KINETIC MODELING OF DYE SORPTION FROM AQUEOUS SOLUTIONS ONTO APPLE SEED POWDER

Batch kinetic studies were carried out for the removal of Brilliant Red HE-3B and Methylene Blue dyes from aqueous media onto apple seed powder. The kinetic data were modeled using three well-known kinetic models: pseudo-first order (Lagergreen model), pseudo-second order (Ho model), and Elovich model, as well as two diffusion models: intraparticle diffusion model (Weber and Morris model) and film diffusion model (McKay model). In order to determine the best-fitting kinetic model, the coefficient of correlation, R-2, the Chi-square test, x(2), and the residual root mean square errors were used for estimating the error of the investigated analysis methods. The sorption kinetics can be described well by the pseudo-second-order model, and the rate limiting step may be represented by both surface diffusion and intraparticle diffusion.