Electrochemical comparative study of Ti/Ta₂O₅/Pt‐RuO₂‐IrO₂ and Ti/Ta₂O₅/Pt anodes: Stability, service lifetime, and electrooxidation performance

Abstract

This work aimed to compare the stability, service lifetime, and electrooxidation performance of Ti/Ta 2 O 5 /Pt-RuO 2 -IrO 2 (PRI) and Ti/Ta 2 O 5 /Pt (Pt) electrodes thermally prepared. The service lifetime study performed under 410 mA/cm 2 in a 9N H 2 SO 4 showed that PRI electrode had six (06) times longer lifetime than the Pt electrode. Bulk electrolysis experiments were carried out on Pt and PRI under 20 mA/cm 2 . COD removal, current efficiency (CE), specific energy consumption (SEC), electrical energy cost, and anode efficiency (η) were estimated. Both electrodes lead to the conversion of the parent compounds. However, the Pt electrode was best suited for amoxicillin (AMX) electrooxidation with 36.89% by COD removal in KClO 4 0.1 M. Besides, the PRI electrode provided the best performances for the AMX electrooxidation (8.15%) and telebrix (TLX) (29.28%) in HClO 4 0.1 M and KClO 4 0.1 M, respectively. The presence of NaCl enhanced significantly the organic compound electrooxidation in terms of COD removal, CE, SEC, electrical energy cost, and η on the both electrodes. This is probably because of the co-action of direct and indirect (by active chlorine) oxidations. But the PRI electrode presented the best performance in the presence of chloride ions. In summary, the experimental conditions can determine the performance of an anode.

Degradation study of some pharmaceuticals in commercial formulation by electro‐Fenton process using a dimensionally stable anode cathode: Analytical technique, optimization conditions, and energy consumption

“…These tubes containing 2 ml of the samples were heated in a digester at 150°C for 2 h. After cooling, the COD value is read directly on the DR600 spectrophotometer. [ 44,46,47 ] The rate of chemical oxygen demand abatement was determined using the formula in Equation (): where COD 0 and COD t are the initial and final chemical oxygen demand, respectively, in mgO 2 /L.…”

“…The experimental setup in this work is the same as in our previous work. [44,46] 3 | RESULTS AND DISCUSSION 3.1 | Method for the quantification of the concentration of AMX…”

“…In addition, these pharmaceuticals have been previously studied in our laboratory in electrooxidation on DSA electrodes and the boron-doped diamond electrode used at the anode. [44][45][46][47][48][49] To our knowledge, no study on the EF process has been carried out with a DSA cathode. Indeed, the electrode is one of the most important factors in the oxygen reduction process with a high yield of H 2 O 2 .…”

“…In addition, these pharmaceuticals have been previously studied in our laboratory in electrooxidation on DSA electrodes and the boron‐doped diamond electrode used at the anode. [ 44–49 ]…”

Degradation of Pharmaceuticals from Simulated and Real Hospital Wastewater applying Conventionnal Fenton Process: Optimization conditions and application

“…These processes based on the in-situ generation of powerful reactive species, in this case hydroxyl radicals, aim essentially at degrading and mineralizing organic compounds. There are several advanced oxidation process (AOPs) among which there are anodic oxidation [14][15][16][17][18], Sono-Fenton [19], Fenton-like [20], electro-Fenton [21][22][23][24], ozonation [25,26] and Fenton [27][28][29][30].…”