| Summary: | 碩士 === 國立雲林科技大學 === 材料科技研究所 === 103 === Pt/TiO2-graphene nanocomposites used as photocatalyst were prepared by a
hydrothermal process using graphene oxide, titanium tetrachloride, and sodium
borohydride as precursors of the TiO2/graphene. Then a given amount of
hexachloroplatinic acid were added in TiO2/graphene solution and stirred for 20 h. After
this, the samples calcined at 500 oC for 1 hr to obtain Pt-doped TiO2-graphene
nanocomposites. Compared to undoped TiO2, the absorption edge of Pt/TiO2-graphene
composites shifted to 435 nm in visible range with Pt doping TiO2, PtO, PtO2 and
graphene incorporation. The prepared Pt/TiO2-graphene nanocomposite catalysts
showed enhanced photocatalytic activity than pure TiO2 under visible-light irradiation
for AO7 degradation. The higher photocatalytic activity of the nanocomposite catalysts
could be attributed to extended light absorption, efficient charge separation, enhanced
adsorptivity, and the photoformed electrons can easily produce more OH radicals and
superoxide radical anion.
Pt/TiO2-graphene nanocomposites exhibits the highest efficiency at the mass ratio
of H2PtCl6 :TiCl4 :GO = 10:100:1. 99.11% of AO7 is decomposed under 6 hr visible
light irradiation.
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