Abstract
Oxidation of rice starch was achieved via electro-generated mixed oxidant due to the electrolysis of saline solution using the titanium/rhodium thermally activated modified electrode. The factors affecting the oxidation criteria such as the pH value of the reaction medium, current density, duration, temperature of oxidation, and the supporting electrolyte concentration were studied. The resultant oxidized starch was evaluated via determining the carbonyl and carboxyl contents as well as the apparent viscosity at different rates of shears. Results obtained indicate that, the optimum operating conditions for the electrocatalytic oxidation of rice starch “suitable sizing materials for cellulosic based textile warps” by the titanium/rhodium thermally activated modified electrode are, current density 7.5 mA/cm 2, pH 3, solution temperature 25 °C, time of electrolysis 60 min. and 7.5 g/l of sodium chloride as supporting electrolyte.
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