Adsorption of methylene blue on bituminous schists from Tarfaya-Boujdour

A. Ayach, S. Fakhi, Z. Faiz, A. Bouih, O. Ait malek, A. Benkdad, M. Benmansour, A. Laissaoui, M. Adjour, Y. Elbatal, I. Vioque and G. Manjon

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In this work, the reactivity of the surface of bituminous schists has been studied using a cation adsorbent, so-called Methylene Blue (MB). This bituminous schist is a calcareous clay rock that contains some amounts of organic matter. The
samples were collected from an outcrop of Lamsied (Laâyoune), zone around Tarfaya-Boujdour. Once the granulometry of samples was well determined, the rocks were characterized by X-ray diffraction and they were analysed by X-ray
fluorescence. Some parameters were considered relevant on the adsorption of MB by surface rock and they have been studied. One of these parameters is the adsorbed molecules-adsorbent contact time. This is the contact between a
starting concentration of MB and a certain mass of gross rock. The analysis of results has shown that adsorption of MB can be well modelled by the Langmuir isotherm and also that a rapid kinetic (<100 min for L-type) can be fitted by a
second-order equation model. The gross rock takes 84 % of the amount of MB in aqueous phase at a time less than 1min, using a rock mass of 0.1 g.