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<table>PL spectral changes with irradiation time over Nd-doped TiO<sub>2</sub> with Ti : Nd = 11 : 1 in terephthalic acid solution of 5 × 10<sup>−4</sup> M.</table>

International Journal of Photoenergy

fig11

Figure 11

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Figure 11 | Neodymium-Doped  with Anatase and Brookite Two Phases: Mechanism for Photocatalytic Activity Enhancement under Visible Light and the Role of Electron 