Daou, I. and Zegaoui, O. and Amachrouq, A. (2017) Study of the effect of an acid treatment of a natural Moroccan bentonite on its physicochemical and adsorption properties. Water Science and Technology, 75 (5). pp. 1098-1117.

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Abstract

In this study, a natural bentonite taken from a deposit in the Northeast of Morocco has been purified (PB) and treated with various HCl molarities (xHPB) in order to obtain an HCl/Bentonite weight ratio equal to 0.2, 0.4 and 0.6. The obtained physicochemical characterization results indicated that the PB sample is composed mainly of the montmorillonite phase. The impact of acid treatment was investigated by identifying changes in the chemical composition, cation exchange capacity, infrared absorption bands, crystalline structure, morphology of the particles and specific surface area. The adsorption behavior of methylene blue (MB) and methyl orange (MO) in aqueous solution onto PB and xHPB samples was investigated by varying the initial concentration of dyes, the contact time and the temperature. The obtained results showed that the experimental data best fit the Langmuir model and the pseudo-second-order kinetic model. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) studies carried out after MB and MO adsorption onto PB samples indicated that MB cations were intercalated, in the form of monomers and dimers, with a large amount of monomers, slightly tilted against the plane of the clay surface. While MO molecules adsorb, with a near perpendicular alignment, with their SO3- group and O- atoms facing the mineral surface plane. © IWA Publishing 2017.

Item Type: Article
Uncontrolled Keywords: Adsorption; Aromatic compounds; Azo dyes; Citrus fruits; Dimers; Dyes; Fourier transform infrared spectroscopy; Light absorption; Mechanisms; Monomers; Positive ions; Solutions; X ray diffraction, Acid treated; Cation exchange capacities; Initial concentration; Methyl Orange; Methylene Blue; Natural bentonite; Physico-chemical characterization; Pseudo-second-order kinetic models, Bentonite, bentonite; cation; dimer; hydrochloric acid; methyl orange; methylene blue; monomer; montmorillonite; azo compound; bentonite; hydrochloric acid, adsorption; aqueous solution; bentonite; cation exchange capacity; chemical composition; concentration (composition); dye; FTIR spectroscopy; montmorillonite; physicochemical property; polymer; X-ray diffraction, absorption; acidification; adsorption; adsorption kinetics; aqueous solution; Article; atom; cation exchange; chemical composition; clay; crystal structure; infrared spectroscopy; isotherm; molecule; Morocco; particle size; physical chemistry; purification; surface area; temperature; thermodynamics; weight; X ray diffraction; adsorption; chemical phenomena; chemistry; ion exchange; isolation and purification; kinetics; pH; scanning electron microscopy, Morocco, Adsorption; Azo Compounds; Bentonite; Cations; Chemical Phenomena; Hydrochloric Acid; Hydrogen-Ion Concentration; Ion Exchange; Kinetics; Methylene Blue; Microscopy, Electron, Scanning; Morocco; Spectroscopy, Fourier Transform Infrared; Temperature; Thermodynamics; X-Ray Diffraction
Subjects: Environmental Science
Divisions: SCIENTIFIC PRODUCTION > Environmental Science
Depositing User: Administrateur Eprints Administrateur Eprints
Last Modified: 31 Jan 2020 15:47
URI: http://eprints.umi.ac.ma/id/eprint/3468

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