Removal of three anionic orange-type dyes and Cr(VI) oxyanion from aqueous solutions onto strongly basic anion-exchange resin. The effect of single-component and competitive adsorption - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Colloids and Surfaces A: Physicochemical and Engineering Aspects Année : 2016

Removal of three anionic orange-type dyes and Cr(VI) oxyanion from aqueous solutions onto strongly basic anion-exchange resin. The effect of single-component and competitive adsorption

Résumé

Adsorption of three anionic Orange-type dyes (i.e., Methyl Orange, Orange II, Orange G) and divalent chromate oxyanion onto Amberlite® IRN-78 from single- and bi-solute aqueous solutions have been investigated in view of testing the removal technologies for dye-contaminated wastewater. The research methodology was based on a combination of equilibrium adsorption, isothermal titration calorimetry, and 13C CP MAS NMR studies. The adsorption followed the pathway of anion exchange between the pristine OH− ions and the oncoming anionic species. The supernatant solution thus became more alkaline, which, in some cases, gave rise to new dye species with an additionally ionized R-N-NH-R moiety, e.g., OII2− or even OG3−. In the single-solute systems, the retention capacity of the resin towards various anionic solutes, on a per-mole basis, decreased in the following order: CrO42− > OG > OII ≈ MO. The retention of dyes was irreversible even in strongly alkaline media contrary to CrO42−, which was completely desorbed from the resin by a 1 mol L−1 NaOH solution. The competition between dye and chromate anions from their equimolar solutions mainly caused a marked decrease in the uptake of CrO42−, thereby pointing to preferential dye retention by Amberlite® IRN-78.
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Dates et versions

hal-01391257 , version 1 (03-11-2016)

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Ganna Darmograi, Benedicte Prelot, Amine Geneste, Louis-Charles de Menorval, Jerzy Zajac. Removal of three anionic orange-type dyes and Cr(VI) oxyanion from aqueous solutions onto strongly basic anion-exchange resin. The effect of single-component and competitive adsorption. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2016, 508, pp.240-250. ⟨10.1016/j.colsurfa.2016.08.063⟩. ⟨hal-01391257⟩
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