臭素酸塩の電解製造に関する基礎的研究(III) : pHの影響

概要

論文の詳細を見る
On the distribution of pH in each part of electrolytic cell, the overall mean pH of electrolytic solution rises with increasing amounts of current passed. But in each part of cell, pH near the anode, decreases and on the other hand, pH near the cathode increases with increasing amounts of current passed. At the central parts between the anode and cathode, pH of the solution were gradually increased during electrolysis. The generally electrolytic formation of bromate caused with a secondary innerreaction by the hypobromite formed with electrochemical reaction. On the increasing of formation quantity for bromate, the change of electrodes (Pt, C, PbO_2) and sodium bromide concentration were examined. In the change of electrodes, Pt electrode was better than C and PbO_2 electrodes. Because C and PbO_2 electrodes caused to electric discharge with cathode, and hypobromous acid and hypobromite formed with electrochemical reaction were decreased. The increase of sodium bromide concentration were decreased to bromate quantity for increasing bromine gas with cathode. The pH of reacted solution was a weak acidity. Furthermore, when the chromate added to electrolytic solution as anti-reducing agent, the reduction of bromate could be prevented, but near the cathode to be alkali could not be prevented.
岡山理科大学の論文