Equilibrium and Kinetic Studies of a Cationic Dye Adsorption onto Raw Clay

Abstract

In this study, methylene blue (MB) dye adsorption from the aqueous solution on rawclay samples collected from the Tilkitepe in the east of Lake Van was presented. Batch adsorptionstudies were conducted to evaluate the effect of various experimental parameters such as pH,contact time and initial concentrations on the removal of MB. The five nonlinear adsorptionequations were applied to describe the equilibrium isotherms. Considering the correlationcoefficients, the order of the most suitable isotherm models was Sips> Freundlich> Temkin>Dubinin- Radushkevich>Langmuir. From the data applied to the pseudo-first-second order, Elovichand intra-particle diffusion kinetic models, it can be said that the best model describing the kineticsof MB dye adsorption is the pseudo-second order (PSO) kinetic model. The results are shown thatTilkitepe / Van raw clay material could be used as an economical and effective adsorbent for dyeremoval.