Electrochemical Oxidation of Oxalate Ions in Aqueous Solutions

Enhanced Direct Electron Transfer Mediated Contaminant Degradation by Fe(IV) Using a Carbon Black-Supported Fe(III)-TAML Suspension Electrode System

“…The relationship between log(k app ) versus pH was further investigated, showing a nonlinear relationship (Figure S12). The decreased oxalate removal rates at high pH values, which are consistent with the results of other studies, 38,39 can be ascribed to the electrostatic repulsion between negatively charged FeTC particles and oxalate in solutions with pH values of 7 and 10, 40 with this repulsive force inhibiting the approach of oxalate to the FeTC particles (Figure 4a). Indeed, oxalate, with pKa values of 1.25 and 4.14, carries a single negative charge at pH 3 and is doubly negatively charged at pH 7 and 10.…”

Catalytic reactions of oxalic acid degradation with Pt/SiO2 as a catalyst in nitric acid solutions

“…Various methods of oxalic acid destruction, such as the addition of oxidizing agents, 10,11 electrolytic oxidation 12,13 and using a catalyst in nitrate solution, [6][7][8][14][15][16][17][18][19][20] have been developed to replace the method for oxalic acid oxidized by KMnO 4 . H 2 O 2 is the most popular reagent for the addition of oxidizing agents in this approach and has the advantage of not importing additional impurity ions into the reaction system, but its drawback is that oxalic acid degradation to limiting oxalic acid concentration is excessively prolonged due to the low reaction rate.…”