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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 7
Affiliation:
[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
Total Affiliations: 7
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 25, 2022-11-21.
Abstract

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)

FAPESP's process: 15/03159-6 - Stability of bioactive coatings produced by plasma electrolytic oxidation.
Grantee:Nilson Cristino da Cruz
Support Opportunities: Regular Research Grants