Synergistic Roles of Direct Electron Transfer and • OH-Mediated Electrooxidation Mechanisms Using a TiOx-REM Electrode
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide This study investigates the electrochemical reactivity of a novel TiOx reactive electrochemical membrane (TiOx-REM) at pilot scale. The material is fabricated through a simple and scalable dip-coating process in which Ti 4 O 7 powder is deposited onto a low-cost commercial silicon carbide (SiC) ceramic membrane serving as the substrate. The work focuses on distinguishing between direct electron transfer (DET) and hydroxyl radical ( • OH)-mediated electrooxidation mechanisms. Oxalic acid (OA) and salicylic acid (SA) were selected as probe molecules for DET and • OH-mediated oxidation, respectively. The TiOx-REM’s performance was evaluated under various current densities (2–6 mA·cm –2 ) in recirculation mode. Significant mineralization rates were achieved, reaching 55% for OA and 42% for SA after 1872 mA·h. Electrolysis of an OA/SA mixture showed competitive behavior, with preferential degradation of SA (95% removal) over OA (52%), confirming the predominance of • OH-driven oxygen transfer over DET and demonstrating the greater efficiency of • OH attack for complex molecules. Energy consumption was below 0.05 kWh g –1 COD, falling within the same order of magnitude as values reported in previous studies. These results underscore the potential of the TiOx-REM for effective wastewater treatment, particularly for complex matrices containing refractory contaminants.
Source: ACS electrochemistry.
Authors: Brian Villanueva Martinez, Hubert Odier, Clémence Coetsier, Karine Groenen Serrano
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
Award: G6397469782
OpenAlex ID: W4417440980