STUDY OF ADSORPTION PROCESSES USING CLAYS AS ADSORBENTS FOR REMOVAL OF RHODAMINE B

Reference	Presenter	Authors (Institution)	Abstract
16-014	Ivna Daniele Souza Pereira	Pereira, I.D.(Universidade Federal de Campina Grande); Silva, I.A.(Universidade Federal de Campina Grande); Da Silva, V.C.(Universidade Federal de Campina Grande); Neves, G.A.(Universidade Federal de Campina Grande); Menezes, R.R.(Universidade Federal de Campina Grande); Ferreira, H.C.(Universidade Federal de Campina Grande); Neto, J.F.(Universidade Federal de Campina Grande);	The smectite clays have applications in several technological sectors, among which their use as adsorbent has stand out in recent years. The present study seeks to analyze the adsorption, equilibrium and kinetic process of smectite clays from the State of Paraíba, Brazil, aiming at their use as adsorbents for the removal of the rhodamine B dye in aqueous solutions. The adsorbents were characterized by granulometric analysis by laser diffraction, X - ray fluorescence, X - ray diffraction and thermal analysis. The effects of the initial concentration of dye, pH and contact time were evaluated. The adsorption equilibrium was reached in a relatively short time, being less than 2 hours. The experimental data of the adsorption equilibrium were adjusted to the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models, and the Freundlich model was the one that best represented the experimental data of the three adsorbents studied. Optimized kinetic data for each adsorption model were fitted to the pseudo-first-order, pseudo-second order and intraparticle diffusion models. The pseudo-second order model presented a better description of the adsorption of the dye by the clay minerals. In general, the clay minerals were found to be adequate adsorbents for the removal of rhodamine B dye, as they present high efficiency, as evaluated in this study, besides the advantages associated with low cost and abundance.
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