Efficient Life-Cycle Management: Recyclable self-support MnCuOxS1-x wastewater treatment catalyst for electrosynthesis of benzoic acid to accelerate hydrogen production

Abstract

Integrating recyclability and reusability into catalyst design can effectively mitigate environmental impact. In this investigation, a three-dimensional Mn-doped Cu2OxS1-x catalyst was incorporated into Cu foam. Following its application in wastewater treatment, the reclaimed catalyst demonstrates robust electrocatalytic prowess in benzyl alcohol oxidation. It efficiently degrades 93.5 % of tetracycline within a 30-minute timeframe in neutral wastewater conditions. Notably, alterations in its morphology and valence state have bolstered its electrocatalytic performance. During the electrosynthesis of benzoic acid, it showcases a diminished starting voltage (1.27 V) while retaining an impressive Faraday efficiency of 97.4 % even at a high voltage of 1.70 V. Density Functional Theory (DFT) analyses shed light on the integration of the catalyst onto Cu foam, facilitating electron transfer from the Cu substrate to the surface catalyst. Furthermore, it is readily recoverable and enhances the adsorption of electrophilic H2O2, thereby augmenting wastewater treatment efficacy. In the context of benzoic acid electrosynthesis, DFT investigations demonstrate that Mn doping significantly enhances the adsorption of OH* and benzyl alcohol in electrocatalysis, thereby enhancing their conversion to benzoic acid. This method of catalyst design, integrating recycling and reuse strategies, has reduced material and energy consumption during catalyst preparation and provided a pathway for the development of advanced catalysts with a focus on sustainability.