Equilibrium, kinetic and thermodynamic studies were made for the adsorption of MB from aqueous
solution onto DPL powder at pH 6.5 . The equilibrium data have been analyzed using Langmuir,
Freundlich, Temkin and Dubinin-Radushkevich isotherms. The characteristic parameters for each
isotherm and related correlation coefficients have been determined. The Temkin isotherm was
demonstrated to provide the best correlation for the sorption of MB onto DPL powder. The adsorption of
MB can be described by the intraparticle diffusion model up to 60 min. The intraparticle diffusion model
indicates that the external surface adsorption (stage 1) is completed before 10 min, and final equilibrium
adsorption (stage 3) is started after 60 min. The MB is slowly transported via intraparticle diffusion into
the particles and is finally retained in micropores. The pseudo second-order kinetic model agrees very
well with the dynamical behavior for the adsorption of MB onto DPL powder. It may be concluded that
DPL powder may be used as a low-cost, natural and abundant source for the removal of MB from the
wastewater.