Abstract
The binding of divalent metal cations (Ca 2+, Cd 2+, Cu 2+, Ni 2+, Pb 2+ and Zn 2+) by sugar-beet pulp was studied. In the presence of 0.1 m NaNO 3 the level of metal cation uptake was found to reach its maximum value very rapidly with the speed increasing both with the sugar-beet pulp concentration and with increasing initial pH of the suspension. Using a pH-metric method and by comparing binding isotherms drawn by measuring the free cation concentration after equilibration, a clear scale of decreasing selectivity was found as follows: Cu 2+~Pb 2+⪢Cd 2+~Zn 2+ > Ni 2+ > Ca 2+. Binding followed the Langmuir-type isotherm except for Ca 2+. Adsorption may contribute to the binding phenomenon in addition to ion exchange, which may include electrostatic interactions and even chelation in the case of the more strongly bound cations. Sugar-beet pulp, which is cheap and highly selective, therefore seems to be a promising substrate to entrap heavy metals in aqueous solutions.
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