Integrated system for in situ generation and online monitoring of H2O2: Coupling an electrochemical flow reactor to a flow injection analysis system

Autor(es)

Santos, Anderson M. ; Souto, Robson S. ; Barros, Willyam R. P. ; Lanza, Marcos R. V.

• Tipo de documento: Artigo Científico
• Fonte: PROCESS SAFETY AND ENVIRONMENTAL PROTECTION; v. 198, p. 9-pg., 2025-04-15.

Resumo

In this study, we investigated for the first time the coupling of an electrochemical flow reactor (EFR) with gas diffusion electrode (GDE) for the in-situ hydrogen peroxide (H2O2) electrogeneration and real-time detection of using a flow injection analysis (FIA) system. In the FIA setup, we employed a screen-printed electrode (SPE) for monitoring H2O2 using 0.050 mol L-1 K2SO4 as supporting electrolyte at pH approximate to 6.5. After optimizing the operational parameters, the system recorded a high degree of precision for H2O2 detection over a concentration range of 1.0-400 mg L-1, reaching a limit of detection of 0.30 mg L-1. The EFR-GDE system was efficiently tested for H2O2 generation in single-pass and recirculating modes at different current densities under 30 L h-1 flow rate and 100 mL min-1 O2(g) flow rate. The FIA system coupled to the EFR-GDE under single-pass mode was effective in determining/monitoring H2O2 generation under different conditions. This coupling approach addresses limitations in conventional H2O2 monitoring techniques, offering a practical solution for decentralized, on-demand applications, and serves as a potential reference for scalable commercial use. (AU)

• Processo FAPESP: 19/06650-3 - EMU concedido no processo 2017/10118-0: sistema potenciostato com módulo de impedância eletroquímica
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 23/14335-6 - Desenvolvimento de sensores eletroquímicos descartáveis para a determinação e monitoramento online de contaminantes emergentes em processos de degradação
• Beneficiário: Anderson Martin dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/22210-0 - EMU concedido no processo 2017/10118-0: cromatógrafo líquido (HPLC)
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 22/12895-1 - Processos avançados para a degradação de poluentes emergentes: materiais catalíticos, sensores eletroanalíticos e divulgação científica
• Beneficiário: Marcos Roberto de Vasconcelos Lanza
• Modalidade de apoio: Auxílio à Pesquisa - Temático