Polyacrylamide-Based Sorbents for the Removal of Hazardous Metals.
Fiche publication
Date publication
août 2013
Auteurs
Membres identifiés du Cancéropôle Est :
Dr BOOS Anne
Tous les auteurs :
Moulay S, Bensacia N, Garin F, Fechete I, Boos A
Lien Pubmed
Résumé
Polyacrylamide was synthesized and chemically modified (PAAm) with 1,2,4,5-tetrahydroxybenzene (THB) or benzene-1,2,4,5-tetrol by applying the reaction conditions of Minisci. A degree of modification as high as 42% was obtained under the following conditions: temperature of 70-80 degrees C, reaction time of 3 hours and [2,5-dihydroxy-1,4-benzoquinone]-to-[AAm] ratio of 2.5. The synthesized PAAm and its modified form (THB-PAAm) were characterized by UV-Vis, Fourier transform infrared spectroscopy, C-13 nuclear magnetic resonance, differential scanning calorimetry and thermogravimetric analysis. A severe degradation of the modified PAAm was observed, as confirmed by its relatively low molecular weight. Yet, the glass-transition temperature of THB-PAAm was found to be drastically lower than that of pristine PAAm, 63.1 versus 161.19 degrees C. A study of copper(II) adsorption by the cross-linked PAAm and THB-PAAm resins was undertaken by varying the following parameters: pH, time, temperature, ionic strength, sorbent mass and initial copper(II) concentration. Adsorption of Pb(II) and Cd(II) by the resins and their corresponding desorption extents were estimated. A new way of cross-linking polyacrylamide and its modified form through an oxidative decarboxylation process is applied.
Référence
Adsorpt Sci Technol. 2013 Aug;31(8):691-709.