TiO2 nanotubes modification by photodeposition with noble metals: Characterization, optimization, photocatalytic activity, and by-products analysis

• DOI: 10.1016/j.jece.2024.112990
• Publication Date: 2024-05-07T16:39:32Z
• Authors: João Lincho; Pawel Mazierski; Tomasz Klimczuk; Rui C. Martins; João Gomes; Adriana Zaleska-M...
• Keywords: Noble metal; Anodizing; Visible spectrum; Nanomaterials

Self-organized TiO2 nanotubes (TNT) with 4 µm length were obtained by anodization method and calcined to obtain an anatase crystallite phase. The photocatalysts further decorated Au, Ag, Pt or Pd nanoparticles (NPs), varying the metal loads (0.50, 0.75, 1, 2 5 mol%) photodeposition. material characterization confirmed presence of in TNTs surface, signs localized surface plasmon resonance (LSPR) effect for some samples a bandgap energy 3.1-3.2 eV. Photoluminescence measurements also that most metallic had recombination photogenerated carriers lowered due trapping deposited NPs. photoactivity was evaluated phenol degradation using UV-Vis visible radiation. Under UV-Vis, best (2 mol% Au-TNTs Pd-TNTs) led 97% removal 60 min while pristine reached 92% removal. radiation, about 3% removal, sample being Pd-TNTs 14% min. Similar results 1 (12% 13% respectively). by-products analysis showed different mechanisms kinetic rates occur when types, types radiation are considered.