Effect of Mixed Valence States of Platinum Ion Dopants on the Photocatalytic Activity of Titanium Dioxide under Visible Light Irradiation.

ABSTRACT: Titanium dioxide doped with the Pt ion (Pt-TiO₂) was synthesized by a sol-gel method using only water as the solvent and conducting dialysis. The photocatalytic activity for the degradation of 4-chlorophenol (4-CP) on Pt-TiO₂ was not affected by the Brunauer-Emmett-Teller specific surface area under visible light (VL) irradiation. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure measurements revealed that only the Pt(IV) ion existed in the TiO₂ bulk and both Pt(II) and Pt(IV) were present near the Pt-TiO₂ surface. Pt(IV) is most likely substituted in the Ti(IV) site of the TiO₂ lattice because of their similar ionic sizes. Quantitative analysis of Pt(II) was performed in the XPS measurements, indicating t

SUBMITTER: Nishiyama N 

PROVIDER: S-EPMC6645471 | biostudies-literature | 2017 Dec

REPOSITORIES: biostudies-literature