| Full text | |
| Author(s): |
de Medeiros, Jessyca Ferreira
;
Galante, Miguel Tayar
;
Bertazzoli, Rodnei
;
dos Santos, Caio Guilherme Pereira
;
Longo, Claudia
Total Authors: 5
|
| Document type: | Journal article |
| Source: | ACS ES&T WATER; v. 2, n. 6, p. 12-pg., 2022-06-10. |
| Abstract | |
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) | |
| FAPESP's process: | 19/11353-8 - Brazilian Water Research Center (BWRC) |
| Grantee: | Lauro Tatsuo Kubota |
| Support Opportunities: | Research Grants - Applied Research Centers Program |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Applied Research Centers Program |
| FAPESP's process: | 19/09838-3 - Multiuser equipments: integrated system for photo electrochemical experiments |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Multi-user Equipment Program |