Evaluation of Ni-0, NiO, and NiS as a Cocatalyst Modifier on TiO2 Nanotubes Matrix for the Enhancement of Photoelectrocatalytic Oxidation of Penicillin G

Autor(es)

Sayao, Fabiana Avolio ^[1] ; Martins, Alysson Stefan ^[1] ; da Silva, Josiel Jose ^[1] ; Boldrin Zanoni, Maria Valnice ^[1]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ, Natl Inst Alternat Technol Detect, Inst Chem, Toxicol Evaluat & Removal Micropollutants, Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Electrochemical Society; v. 168, n. 7 JUL 1 2021.
• Citações Web of Science: 0

Resumo

The development of an effective cocatalyst for the modification of TiO2 arrays has become highly desirable for the improvement of their photoelectrocatalytic properties. We investigated the modification of TiO2 with nickel-based cocatalysts (nickel (Ni-0), nickel oxide (NiO), and nickel sulphide (NiS)) by electrochemical deposition. The formation of n-p heterojunctions for the Ti/TiO2/NiO and Ti/TiO2/NiS and the generation of Schottky-type barrier for the Ti/TiO2/Ni-0 led to the enhancement of visible light absorption and the reduction of the band gap energy, contributing significantly to improving the electrogeneration of the electron-hole and lifetime of the holes. The Ti/TiO2/NiS photocurrent was found to be almost two times higher than that of the Ti/TiO2 (5.39 mA.cm(-2) at +1.50 V); this result was attributed to the excellent distribution of the cocatalyst around the TiO2 nanotube walls, which helped enhance the chemical interaction on the TiO2/NiS interface. Under optimized conditions (+0.50 V and UV-vis irradiation), the application of the Ti/TiO2/NiS electrode for the photoelectrocatalytic treatment of penicillin-G-(PG) (10 mg l(-1)) resulted in complete removal and mineralization after 60 min at pH 7. The results showed that one can potentially increase the photoelectrocatalytic efficiency of Ti/TiO2 through a simple modification of the material. (AU)

• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/13123-4 - Desenvolvimento de membranas fotoeletrocatalíticas baseadas em TiO2 e Al2O3 modificadas e aplicadas no tratamento de contaminantes orgânicos e microrganismos em meio aquoso.
• Beneficiário: Alysson Stefan Martins
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado