Abstract
Batch adsorption tests for removal of methylene blue dye (MBD) from aqueous solutions onto bentonite was investigated using natural chemically treated (sulphuric acid) and physically treated (microwaved) bentonite. In batch sorption tests for MBD removal by the developed sorbents, the time needed to reach equilibrium was less than 30 min. The uptake of MBD by the microwave-treated bentonite was the highest, followed by the acid-treated and finally the untreated bentonite. The uptake of MBD increased with an increase in the dye concentration or the solution temperature. Three kinetic models were used for elucidation of the probable mechanisms of MBD uptake by the three sorbents. The rates of MBD uptake followed the pseudo second-order model with a high correlation. Intraparticle diffusion was involved in the sorption process but was not the rate-controlling factor. The Freundlich and Langmuir isotherm models were employed and well represented the experimental data.
Résumé
Des tests d’adsorption en série, destinés à enlever des colorations au bleu de méthylène (MBD) de solutions aqueuses, à l’aide de bentonite, ont été réalisés. La bentonite utilisée était naturelle, traitée chimiquement à l’acide sulfurique ou traitée physiquement par micro-ondes. Dans les tests d’adsorption pour enlèvement de MBD par les agents de sorption mis en oeuvre, le temps nécessaire pour atteindre l’équilibre est inférieur à 30 mn. Le prélèvement de MBD par la bentonite traitée par micro-ondes a été le plus important, suivi par la bentonite traitée à l’acide et finalement la bentonite naturelle. Le prélèvement de MBD augmente avec la concentration du colorant ainsi qu’avec la température de la solution. Trois modèles cinétiques ont été considérés pour comprendre les processus vraisemblables de prélèvement de MBD par les trois agents de sorption. Les taux de prélèvement de MBD suivent un modèle de second ordre, de très près. La diffusion intra-particulaire est concernée par le processus de sorption, mais n’est pas le facteur contrôlant le taux de prélèvement. Les modèles des isothermes de Freundlich et de Langmuir rendent bien compte des données expérimentales.
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Banat, F., Al-Asheh, S., Al-Anbar, S. et al. Microwave- and acid-treated bentonite as adsorbents of methylene blue from a simulated dye wastewater. Bull Eng Geol Environ 66, 53–58 (2007). https://doi.org/10.1007/s10064-006-0054-1
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DOI: https://doi.org/10.1007/s10064-006-0054-1