Tetra-n-butylammonium Bromide (TBAB) Modified Cameroonian Local Clay Material for Adsorption of Crystal Violet Dye from Aqueous Solution

Batch Equilibrium and Kinetic Studies of Anionic and Cationic Dyes Adsorption onto Al−Pillared Clay from a Local Cameroonian Clay Materials in Aqueous Medium

“…The natural clay used in this work was obtained from Boboyo's deposit in the Kaele Sub Division, Far-North Region of Cameroon. This clay material has been characterized and described in previous works [16,17]. Its physico-chemical properties reported in previous work are given in table 2.…”

“…Indeed, numerous and vacant active surface sites of adsorbent were available in the early stages of the adsorption, while as the contact time increased, the number of vacant sites decreased, thereby slowing down the adsorption process. Similarly, the increase of the initial dye concentration led to higher loading rates of the adsorbate molecule, which was attributed to the enhanced driving force of the concentration gradient to the vacant sites of adsorbent [17,21,22]. Therefore, the adsorption time was fixed to 20 min in all adsorption experiments to make sure that the adsorption reached equilibrium.…”