Activated carbon cloths are recent adsorbents whose adsorption properties are well known for monocomponent solutions
of organics or metal ions. However, to treat wastewaters with these materials, their performance has to be determined in
21 21 multicomponent solution. This work studies adsorption competition between metal ions (Cu , Pb ) and organic matter
(benzoic acid). The first part investigates adsorption equilibrium of monocomponent metal ions solutions and shows the
dependence of adsorption capacities on adsorbent porosity and metal ions chemical properties (molecular weight, ionic radius
and electronegativity). The influence of pH is also demonstrated. The second part focuses on adsorption competition: (1)
between both metal ions (a decrease of adsorption capacities is observed, whose value is related to adsorption kinetics of
metal ions); (2) between metal ions and organic matter, in solution or adsorbed onto the activated carbon cloth (a strong
influence of pH is shown: when benzoic acid is under benzoate form, in both cases adsorption is increased due to the
formation of ligands between adsorbed benzoate ions and metals).
2002 Elsevier Science Ltd. All rights reserved.
Activated carbon cloths are recent adsorbents whose adsorption properties are well known for monocomponent solutionsof organics or metal ions. However, to treat wastewaters with these materials, their performance has to be determined in21 21 multicomponent solution. This work studies adsorption competition between metal ions (Cu , Pb ) and organic matter(benzoic acid). The first part investigates adsorption equilibrium of monocomponent metal ions solutions and shows thedependence of adsorption capacities on adsorbent porosity and metal ions chemical properties (molecular weight, ionic radiusand electronegativity). The influence of pH is also demonstrated. The second part focuses on adsorption competition: (1)between both metal ions (a decrease of adsorption capacities is observed, whose value is related to adsorption kinetics ofmetal ions); (2) between metal ions and organic matter, in solution or adsorbed onto the activated carbon cloth (a stronginfluence of pH is shown: when benzoic acid is under benzoate form, in both cases adsorption is increased due to theformation of ligands between adsorbed benzoate ions and metals). 2002 Elsevier Science Ltd. All rights reserved.
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