Enhancing clay adsorption properties: a comparison between chemical and combined chemical/thermal treatments

Youssef El Ouardi (1) , Véronique Lenoble (1) , Catherine Branger (2) , Katri Laatikainen (3) , Bernard Angeletti (4) , Abdelkrim Ouammou (5)

1 MIO - Institut méditerranéen d'océanologie
2 MAPIEM - Laboratoire Matériaux Polymères Interfaces Environnement Marin - EA 4323
3 Lappeenranta-Lahti University of Technology
4 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
5 USMBA - Université Sidi Mohamed Ben Abdellah

A Moroccan bentonite was activated by sodium carbonate (Na-Be), and by a combined chemical and thermal activation (Na-Be450). The materials characterization was performed by XRD, EDS, FTIR, SEM and porosity measurements. The efficiency of Na-Be and Na-Be450 as low-cost adsorbents to remove nickel and silver from aqueous solution was checked. The Langmuir, Freundlich and Langmuir-Freundlich models were used for the analysis of equilibrium isotherms. Na-Be and Na-Be450 demonstrated a good removal efficiency towards nickel and silver, even in complex effluents (industrials wastewaters). The regeneration study proved that Na-Be450 presented all the characteristics of an efficient material for nickel removal.

Mots clés: bentonite; chemical activation; thermal activation; adsorption; nickel; silver

Domaines: Chimie

Youssef El Ouardi, Véronique Lenoble, Catherine Branger, Katri Laatikainen, Bernard Angeletti, et al.. Enhancing clay adsorption properties: a comparison between chemical and combined chemical/thermal treatments. Groundwater for Sustainable Development, 2021, 12, pp.100544. ⟨10.1016/j.gsd.2020.100544⟩. ⟨hal-03619685⟩