The use of amidoximated cellulose for the removalof metal ions and dyes from waste waters |
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Authors: | Rima Saliba Helene Gauthier Robert Gauthier Michelle Petit-Ramel |
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Institution: | (1) Laboratoire des Matériaux Polymères et Biomatériaux, UMR CNRS n°, Université Claude Bernard Lyon 1, 5627, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France |
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Abstract: | The adsorption of metal ions such as Cu(II), Cr(III), Cd(II) and Ni(II)and dyes such as Acid Blue 25, Calmagite and Eriochrome Blue Black Bis performed onto amidoximated cellulose (Am-Cell). Different ways are possible for theadsorption of these pollutants onto Am-Cell : adsorption of each pollutantaloneon the support, or cumulative adsorption of both metal ions and dyes on the samesupport. In the last case, the pollutants may be adsorbed simultaneously from aunique solution, or successively from two different solutions, whatever theorder. Am-Cell loaded or not with metal ions shows a high capacity for dyeadsorption. Ternary complexes involving metal/dye/amidoxime are formed. Theobserved stoichiometries are 1/1/1 with Cu(II), Cr(III) and Cd(II) ions and1/1/2with Ni(II) ion. A quasi-total and specific desorption of either metal ions (bytreatment with ethylenediaminetetracetic salt) or of dyes (by heating inaqueoussolution) is possible from these ternary complexes. Concerning the dyes, manysuccessive adsorption/desorption cycles are possible without a noticeablechange in the adsorption capacity. |
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Keywords: | Amidoxime Cellulose Depollution Dyes Heavy metals Sorption |
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