Heterogeneous Photocatalysis with Niobium Doped-Titanium Substrates Treated by Plasma Electrolytic Oxidation

Autor(es)

Fábio R. Orsetti ^[1] ; Thaís M. Gonçalves ^[2] ; Lívia Sottovia ^[3] ; Elaine B. Figueiredo ^[4] ; Ana M. Ferrari ^[5] ; Elidiane C. Rangel ^[6] ; Nilson C. Cruz ^[7]

Afiliação do(s) autor(es)

^[1] Universidade Estadual Paulista. Laboratório de Plasmas Tecnológicos - Brasil

^[2] Universidade Estadual Paulista. Laboratório de Plasmas Tecnológicos - Brasil

^[3] Universidade Estadual Paulista. Laboratório de Plasmas Tecnológicos - Brasil

^[4] Universidade Tecnológica Federal do Paraná - Brasil

^[5] Universidade Tecnológica Federal do Paraná - Brasil

^[6] Universidade Estadual Paulista. Laboratório de Plasmas Tecnológicos - Brasil

^[7] Universidade Estadual Paulista. Laboratório de Plasmas Tecnológicos - Brasil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 25, 2022-11-21.

Resumo

Plasma Electrolytic Oxidation (PEO) was employed for the generation of porous niobium-containing surfaces with enhanced photocatalytic activity. Pulses of 500 and 600 V, with a repetition rate of 60 Hz, were applied to titanium disks immersed in niobium-containing electrolytic solutions. The treatment time ranged from 180 to 600 s, and the surface morphology was analyzed by scanning electron microscopy, while X-ray diffraction was employed in the evaluation of crystallographic structure. The optical gap of the samples was determined from UV-Vis reflection spectra, and an automated goniometer was used for contact angle and surface energy measurements. More than 35% of Nb has been incorporated into the samples. Under certain conditions, the treatments resulted in a reduction of the optical gap from 3.18 to 2.63 eV as compared to as-received samples. Photocatalytic degradation rates of methylene blue as high as 70% have been reached after 120 minutes under irradiation with UV-Vis light. (AU)

• Processo FAPESP: 15/03159-6 - Estabilidade de revestimentos bioativos produzidos por oxidação eletrolítica assistida por plasma
• Beneficiário: Nilson Cristino da Cruz
• Modalidade de apoio: Auxílio à Pesquisa - Regular