Adsorption of Cr (III) from aqueous solution by two forms of a superabsorbant polymer : parametric study and effect of activation modeA. Ouass, Y. Essaadaoui, L. Kadiri, I. Lebkiri, C. Lafreme, M. Cherkaoui, A. Lebkiri and E. H. RifiE3S Web Conf., 37 (2018) 02001DOI: https://doi.org/10.1051/e3sconf/20183702001