INDIRECT OXIDATION OF STARCH BY PERIODATE WITH IN SITU REGENERATION OF AN OXIDIZER ON RUTHENIUM OXIDE TITANIUM AND PLATINUM ANODES IN AQUEOUS MEDIA
UDC 541.135:547.0
Abstract
The process of electrochemical oxidation of potato starch with potassium iodate in a two-chamber electrolytic cell with in situ oxidant regeneration on ruthenium-titanium oxide (ORTA) and platinum (Pt) anodes depending on current density, pH of the electrolyte, substrate concentration, its aggregate state and ultrasonic treatment is studied. The conditions of the oxidized starch production process were determined: current density of 100 mA/cm2 for ORTA and 50.0 – Pt, pH 7, electrolysis time – 90 minutes, ultrasonic treatment time 30 minutes. It has been established that the temperature regime and the treatment of starch with ultrasound have a significant effect on the reaction of periodate oxidation. With ultrasonic treatment and a reaction temperature of 40 °C, the yield of aldehyde groups increases to 65 mol.%. The reaction products were analyzed by methods: IR spectroscopy, elemental analysis, scanning electron microscopy, X-ray phase analysis. After electrochemical oxidation, a decrease in the intensity of the starch diffraction lines is observed due to the destruction of its crystalline component. A new PP appears in the IR spectrum of oxidized starch. at 1734 cm-1, due to valence fluctuations of the C=O bond of aldehydes. The study showed that indirect electrocatalytic oxidation of starch with periodate with in situ oxidant regeneration proceeds most effectively on a ruthenium-titanium oxide electrode in a two-chamber cell, and the proposed approach is of interest for further development.
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