Abstract
The electrochemical oxidation (EO) of oxalic acid (OA) has been studied in acidic media at Ti/PbO2, highly boron-doped diamond (BDD), Pt, and graphite electrodes by linear polarization and galvanostatic electrolyses applying a current of 60 mA cm−2. The concentration of OA during EO was monitored by differential pulse voltammetry (DPV) using glassy carbon electrode and the results were also confirmed by high-performance liquid chromatography (HPLC). The experimental results of galvanostatic electrolyses showed that the performances of the process dramatically depend on the anodic material and in particular, the removal efficiencies obtained at Ti/PbO2, graphite, BDD, and Pt anodes were 90, 85, 80, and 78 %, respectively. Furthermore, DPV analyses compared with HPLC method achieved good fit, confidence intervals, and limits.
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