Abstract
The kinetics and mechanism of the gelation reaction on capillary ionotropic membranes of nickel alginate complex have been studied complexometrically. It was found that the exchange between Na + ions of the macromolecular chains of alginate sol and Ni 2+ ions of the electrolyte proceed according to a sigmoidal curve with a distinct rapid period initially followed by a decrease in the rate of exchange at longer times. Second-order overall kinetics have been observed. The rate of gelation conforms to d[Gel] dt = R j [Alg −][Ni 2+] where R j represents the second order rate of exchange of either the fast or slow exchange in such a gelation reaction. The kinetic parameters were evaluated and a tentative mechanism is discussed.
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