Solar-Driven Photoreactor for Water Remediation Based on n-Type TiO2 and p-Type Ag/AgBiW2O8/Bi2WO6 Light-Responsive Air-Fed Gas Diffusion Electrodes

Autor(es)

de Medeiros, Jessyca Ferreira ; Galante, Miguel Tayar ; Bertazzoli, Rodnei ; dos Santos, Caio Guilherme Pereira ; Longo, Claudia

• Tipo de documento: Artigo Científico
• Fonte: ACS ES&T WATER; v. 2, n. 6, p. 12-pg., 2022-06-10.

Resumo

Photocathodes with multiphasic Ag/AgBiW2O8/Bi2WO6 (Ag/ABW/BW) particles, obtained by hydrothermal synthesis, were evaluated for light-assisted oxygen reduction reaction (ORR). Under irradiation, electrodes of Ag/ABW/BW deposited on FTO exhibited ORR cathodic photocurrent enhancement and impedance decreasing (p-type semiconducting behavior). The Ag/ABW/BW particles were deposited on graphite sintered with PTFE; under irradiation and flow of compressed air, this gas diffusion electrode (GDE) produced H2O2 from ORR. The air-fed GDE vertical bar Ag/ABW/BW photocathode was associated with an FTO vertical bar TiO2 photoanode and externally connected with a silicon solar cell. Irradiated by a solar simulator, this photoreactor was used for remediation of amoxicillin (AMX) aqueous solution. After 3 h, 53% of AMX was degraded, while with a bare GDE, the AMX removal was 30%. Smaller values (<15%) were obtained using Pt or a GDE vertical bar Ag/ABW/BW under N-2 flow as the cathode, since these configurations preclude the H2O2 production from ORR. Thus, association of photoactive electrodes in this innovative solar-driven photoreactor provides a sustainable system for water remediation. (AU)

• Processo FAPESP: 19/11353-8 - Centro Brasileiro de Pesquisa em Água (BWRC)
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 17/11986-5 - Geração e Armazenamento de Novas Energias: trazendo desenvolvimento tecnológico para o país
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia
• Processo FAPESP: 19/09838-3 - EMU concedido pelo Projeto FAPESP 2017/11986-5: sistema integrado de medidas fotoeletroquímicas
• Beneficiário: Ana Flávia Nogueira
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários