Abstract
A new class of photocatalysts, referred to as Pt(0)- or Pt(IV)-deposited anatase/hexa-titanate nanotubes (Pt(0)-TNTs-600 and Pt(IV)-TNTs-600), were prepared through a three-step process: hydrothermal conversion of commercial TiO2 to titanate nanotubes and subsequent deposition of Pt and calcination. At the optimal Pt dosage (0.1 wt %) and calcination temperature (600 °C), Pt(0)-TNTs-600 showed the highest photocatalytic activity for degrading phenanthrene. The apparent pseudo-first order rate constant (k1) was determined to be 0.12 h–1, which was ∼2 and 3 times of that for Pt(IV)-TNTs-600 and P25. TEM, XRD, FTIR, and XPS analyses indicate that Pt(0)-TNTs-600 is a composite of anatase and hexa-titanate with metallic Pt deposited, where Pt facilitates transport of photogenerated electrons, thus inhibiting recombination of the electron–hole pairs. Moreover, DRS UV–vis analysis revealed a narrower optical energy gap of materials, resulting in enhanced absorbance in the visible region. The new photocatalyst co...
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