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|Type:||Artigo de periódico|
|Title:||Copper, Lead And Zinc Adsorption On Mno2-impregnated Cellulose Acetate|
|Author:||Baggio Brandao M.S.|
|Abstract:||Manganese (IV) oxide supported on cellulose acetate (MnO2/CA) is a material which combines the adsorbent properties of MnO2 with the handling characteristics of the polymer fibers. CA was impregnated with noncrystalline MnO2 by immersion of this polymer in acidic potassium permanganate solution at 60°C. The adsorption capacity of the composite was evaluated, using Cu(II), Zn(II) and Pb(II) ions. Isotherms were obtained showing the following characteristics: high affinity at low concentrations; saturation above an equilibrium concentration of 2.0 mM. Adsorption capacities are: 1.7 mmol g-1 MnO2 for Cu(II) and 2.3 mmol g-1 MnO2 for Pb(II). Adsorption capacity of Cu (II) increases with temperature and is nearly constant above pH 3. During continuous flow of CuSO4 solution through columns packed with MnO2/CA, Cu(II) ions are effectively removed, even when the feed stream concentration is as low as 5 ppm. Cu(II) adsorption is irreversible and occurs with desorption of manganese ions. © 1990.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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