Abstract
We report on an experimental study aimed at optimizing the radiocatalytic properties of pure and copper-incorporated TiO2 powders. This has been achieved by conducting cross-checked structural, optical and radiocatalytic studies. Structural and nanoscale analyses show evidence of internal doping by Cu2+ in the TiO2 lattice that leads to the reduction of the optical band gap down to 1.5 eV. The effect of gamma radiation on the radiocatalytic activity of these catalysts was studied by degradation of methylene blue as a model pollutant. It was found that the addition of Cu-doped TiO2 (anatase) powders improves significantly the pollutant degradation, as compared to photocatalysis. The doping and the annealing temperature's impact on the structural, optical and radiocatalytic efficiencies are highlighted and correlated.
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•Copper doped and undoped TiO2 powders were prepared by sol-gel route.•Nanoscale analysis show evidence of internal doping by Cu2+ in the TiO2 sublattice.•Substitution reduce the optical band gap down to 1.5 eV.•Metallic copper segregation is formed at the crystallite surfaces.•Anatase Cu doped TiO2 improves significantly the radiocatalytic efficiency.