Formation of Titanium Dioxide Nanotubes on Ti-Ni Alloys by Anodization for Cr(VI) Removal from Wastewater.

ABSTRACT: This study evaluated the synthesis of nanotubes (NTs) on a Ti-Ni alloy substrate and application as a photocatalyst for the reduction of toxic Cr-(VI). Ti-Ni alloys (with Ni contents of 1, 5, 10, 20, and 40 wt %) prepared via the powder metallurgy method were anodized under parameters that promote NT formation. Field-emission scanning electron microscopy revealed that NT structures were formed only on Ti-Ni alloys containing <10 wt % Ni, while higher Ni content (>20 wt %) led to less defined, nanoporous morphologies. Post-anodization annealing in air promoted the formation of anatase TiO₂, while subsequent hydrogenation in an Ar-H₂ atmosphere introduced Ti^{3 +} defects and oxygen vacancies without compromising the NT integrity. XPS analysis confirm

SUBMITTER: Alias N 

PROVIDER: S-EPMC12529209 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature