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article
Study of Methylene Blue Adsorption by Modified Kaolinite by Dimethyl Sulfoxide
Abstract
<jats:title>Abstract</jats:title><jats:p>Tamazert kaolin was modified with dimethyl sulfoxide (DMSO). The starting material and resulting from the intercalation were characterized by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy (SEM). Intercalation caused considerable changes in our clay by increasing the basal spacing to 11.22 Å, an intercalation rate of 98 %. The adsorption of methylene blue was studied as a function of pH, contact time, temperature, dye concentrations and adsorbents. Kinetic data have been adequately described by the pseudo-second order and intraparticle scattering model. The adsorption isotherm is in good agreement with the Redlich-Peterson model. A change in thermodynamic values (<jats:italic>ΔH°</jats:italic>, <jats:italic>ΔS°</jats:italic> and <jats:italic>ΔG°</jats:italic>) was observed after intercalation. Adsorption became non-spontaneous exothermic and ordered.</jats:p>