Activity and stability of bifunctional perovskite/carbon-based electrodes for the removal of antipyrine by electro-Fenton process
Bifunctional perovskite/carbon-black(CB)/polytetrafluoroethylene(PTFE) electrodes for electro-generation and catalytic decomposition of hydrogen peroxide to oxidizing hydroxyl radicals have been fabricated. These electrodes were tested for electroFenton (EF) removal of antipyrine (ANT) as a model antipyretic and analgesic drug. The influence of the binder loading (20 and 40 wt % PTFE) and type of solvent (1,3-dipropanediol and water) was studied for the preparation of CB/PTFE electrodes. The electrode prepared with 20 wt % PTFE and water exhibited a low impedance and remarkable H2O2 electro-generation (about 1 g/L after 240 min, a production rate of ca. 6.5 mg/h⋅cm2 ). The incorporation of perovskite on CB/PTFE electrodes was also studied following two different methods: i) direct deposition on the CB/PTFE electrode surface and ii) addition in the own CB/PTFE/ water paste used for the fabrication. Physicochemical and electrochemical characterization techniques were used for the electrode’s characterization. The dispersion of perovskite particles in the own electrode matrix (method ii) exhibited a higher EF performance than the immobilisation onto the electrode surface (method i). EF experiments at 40 mA/cm2 and pH 7 (non-acidified conditions) showed ANT and TOC removals of 30% and 17%, respectively. The increase of current intensity up to 120 mA/cm2 achieved the complete removal of ANT and 92% of TOC mineralisation in 240 min. The bifunctional electrode also proved high stability and durability after 15 h of operation.
The authors wish to thank “Comunidad de Madrid” and European Structural Funds for their financial support through the REMTAVARES-CM project (S2018/EMT-4341), ELECTROCHAR project (M2739- ‘Programa de estímulo a jóvenes investigadores URJC’), SLUD4MAT&WATER project (PID2021-122883OB-I00) and ‘Universidad Rey Juan Carlos’ for funds from ‘Ayudas a la asistencia a Congresos Científicos y Movilidad para el personal Docente e Investigador’. This research has been also financially supported Project PID2020-113667GBI00 funded by MCIN/AEI/10.13039/501100011033 and PDC2021-121394-I00 funded by MCIN/AEI/10.13039/501100011033 and European Union Next GenerationEU/PRTR.
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