In-situ electrogeneration of H2O2 and hydroxyl radical applied for venlafaxine degradation: a novel strategy using FeSe2-modified carbon gas diffusion electrode.
BIMBI JUNIOR, Fausto Eduardo; COSTA JUNIOR, Oswaldo; SOUTO, Robson da Silva; ENCIDE, João Pedro Portilho; BARUCH, Micael Mantovani; FELIPE, Maria Clara Vieira; FERNANDES, Larissa; ARAUJO, Isabela Fiori de; FERNANDES, Carlos Henrique Magalhães; OLIVEIRA, Igor Gabriel Silva; HONORIO, Kathia Maria; COLOMBO, Renata; MASTELARO, Valmor Roberto; BARROS, Willyam Róger Padilha; LANZA, Marcos Roberto de Vasconcelos.
BIMBI JUNIOR, Fausto Eduardo; COSTA JUNIOR, Oswaldo; SOUTO, Robson da Silva; ENCIDE, João Pedro Portilho; BARUCH, Micael Mantovani; FELIPE, Maria Clara Vieira; FERNANDES, Larissa; ARAUJO, Isabela Fiori de; FERNANDES, Carlos Henrique Magalhães; OLIVEIRA, Igor Gabriel Silva; HONORIO, Kathia Maria; COLOMBO, Renata; MASTELARO, Valmor Roberto; BARROS, Willyam Róger Padilha; LANZA, Marcos Roberto de Vasconcelos.
Abstract: In the present work, iron diselenide (FeSe2) nanoparticles (NPs) were synthesized via the hydrothermal method and were employed as photo-electrocatalysts for oxygen reduction reaction (ORR) and organic pollutant degradation. The modification of the surface of Printex L6 carbon (PL6C) structure with FeSe2 NPs resulted in enhanced ORR activity and selectivity, leading to the efficient electrogeneration of hydrogen peroxide (H2O2) and hydroxyl radical ( ? OH). The application of the 2%FeSe2-modified PL6C with gas diffusion electrode (GDE) resulted in a 2.0-fold and 3.15-fold increase in H2O2 production in alkaline and acidic media, respectively, compared to the unmodified PL6C-GDE, under identical operating conditions. Density Functional Theory (DFT) calculations confirmed that the modification of the PL6C-GDE with FeSe2 NPs markedly enhanced O2 adsorption on the PL6C surface, reducing the Gibbs free energy from - 93.47 to - 202.12 kJ mol- 1 . Photocatalytic H2O2 production increased by 1.25-fold in alkaline media due to the narrow bandgap of FeSe2 NPs. In acidic condition, the competitive formation of ? OH resulted in H2O2 consumption, even in the presence of a scavenger. The 2% FeSe2-modified PL6C-GDE exhibited excellent performance when applied for the photo-electrochemical degradation of 15 mg L- 1 venlafaxine, achieving complete mineralization in both alkaline (180 min) and acidic media (120 min). This work highlights the role of FeSe2 NPs in modulating ORR pathways on the PL6C catalyst and promoting efficient electron transfer, in addition to enhancing protonation, oxygen adsorption, and formation of intermediates. These effects boost H2O2 selectivity and ? OH generation, thus making the FeSe2-modified PL6C-GDE a highly promising photo-electrocatalyst for en
@article={003252767,author = {BIMBI JUNIOR, Fausto Eduardo; COSTA JUNIOR, Oswaldo; SOUTO, Robson da Silva; ENCIDE, João Pedro Portilho; BARUCH, Micael Mantovani; FELIPE, Maria Clara Vieira; FERNANDES, Larissa; ARAUJO, Isabela Fiori de; FERNANDES, Carlos Henrique Magalhães; OLIVEIRA, Igor Gabriel Silva; HONORIO, Kathia Maria; COLOMBO, Renata; MASTELARO, Valmor Roberto; BARROS, Willyam Róger Padilha; LANZA, Marcos Roberto de Vasconcelos.},title={In-situ electrogeneration of H2O2 and hydroxyl radical applied for venlafaxine degradation: a novel strategy using FeSe2-modified carbon gas diffusion electrode},journal={Chemical Engineering Journal},note={v. 517, p. 164432-1- 164432-18},year={2025}}