Photo-anodes based on B-doped TiO2 for photoelectrocatalytic degradation of propyphenazone
Carregando...
Data
2022
Data de publicação:
Autores IPEN
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Journal of Environmental Chemical Engineering
ODS
Exportar
Resumo
The photoelectrocatalysis (PEC) using B-doped TiO2 photo-anodes for degradation of the propyphenazone (PPZ) was investigated. For this, four different composites based on TiO2 and TiO2-x%B (x = 1, 3 or 5) were synthesized by sol-gel method and supported on titanium substrate by the dip-coating technique. The morphology, optical and electrochemical properties of photo-anodes were evaluated by SEM, TEM, XPS, TGA, DSC, XRD, FTIR, DRS, and sweep voltammetry, respectively. The influence of pH (3, 6 or 9) and electrical potential intensity (+1 V, +2 V or +3 V) used in PEC were evaluated by kinetic study. To understand the synergistic effect of the composition of the photoelectrochemical system, photolysis (PS), electrocatalysis (EC) and photocatalysis (PC) experiments were realized under comparative conditions. Doping 3% of B into TiO2 promoted a decrease in band gap energy (Ebg = 2.91 eV), thus providing better radiation absorption and greater generation of charge carriers on the surface of the photo-anode. Characterization analyzes indicate the presence of B2O3 coexisting with TiO2. The most promising results were obtained using Ti/TiO2-3%B photo-anode (vs a DSA cathode), applying + 1 V at pH 6, resulting in 91% of PPZ degradation after 60 min of PEC treatment. Toxicity tests using A. salina and L. sativa showed that the effluent generated after 2 h of PEC treatment of 30 mg L-1 of PPZ is non-toxic for the studied species. Up to 13 by-products formed during the PEC and PS treatment were detected and a proposal pathway involving possible routes of PPZ degradation were presented.
Como referenciar
SILVA, THALITA F. da; CAVALCANTE, RODRIGO P.; GUELFI, DIEGO R.V.; OLIVEIRA, SILVIO C. de; CASAGRANDE, GLEISON A.; CAIRES, ANDERSON R.L.; OLIVEIRA, FELIPE F. de; GUBIANI, JULIANA R.; CARDOSO, JULIANO C.; MACHULEK JUNIOR, AMILCAR. Photo-anodes based on B-doped TiO2 for photoelectrocatalytic degradation of propyphenazone: identification of intermediates, and acute toxicity evaluation. Journal of Environmental Chemical Engineering, v. 10, n. 2, p. 1-15, 2022. DOI: 10.1016/j.jece.2022.107212. Disponível em: http://repositorio.ipen.br/handle/123456789/33001. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.