Column adsorption desorption behavior of cationic dyes by Moroccan clay

Asma Bennani Karim


The adsorption using continuous fixed bed study was carried out by using Moroccan clay as adsorbent for the removal of BR46 and MB dyes. The effect of flow rate, influent dyes concentration and bed depth was studied. It was found that breakthrough time decreases with increasing initial dye concentration (775 - 552 min for BR46, 580 to 420 min for MB) and flow rate (410- 45 min for BR46, 255- 37.5 min for BM), but it increases with rising bed height (267- 580 min for MB, 435- 775 min for BR46). The Bohart-Adams model’s and its BDST rearranged one, were implemented to the dynamic adsorption process initial part, to evaluate the fixed-bed column performances. The Clark model was applied to predict the breakthrough curves in the upper range of concentration. And so a good representation of experimental curves in a large domain of concentration is obtained for all used models. This approach in the modeling clean-up process has permitted to put in evidence the complementarity of the used models. The study is achieved by the desorption test. 11% and 7% was retained for the BR46 and MB. This study highlighted the natural clay feasibility as a promising economical adsorbent.


Adsorption, Moroccan clay, BR46 and BM dyes adsorbates, dynamic reactor, adsorption modeling, desorption.

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