Abstract
Visible‐light‐activated yellow amorphous TiO2 (yam‐TiO2) was synthesised by a simple and organic‐free precipitation method. TiN, an alternative precursor for TiO2 preparation, was dissolved in hydrogen peroxide under acidic condition (pH ~ 1) adjusted by nitric acid. The yellow precipitate was obtained after adjusting pH of the resultant red brown solution to 2 with NH4OH. The BET surface area of this sample was 261 m2/g. The visible light photoactivity was evaluated on the basis of the photobleaching of methylene blue (MB) in an aqueous solution by using a 250 W metal halide bulb equipped with UV cutoff filter (λ > 420 nm) under aerobic conditions. Yam‐TiO2 exhibits an interesting property of being both surface adsorbent and photoactive under visible light. It was assigned to the η2‐peroxide, an active intermediate form of the addition of H2O2 into crystallined TiO2 photocatalyst. It can be concluded that an active intermediate form of titanium peroxo species in photocatalytic process can be synthesised and used as a visible‐light‐driven photocatalyst.
Highlights
Titaniumdioxide(TiO2)has been the prevailing material in the fields of photocatalysis and solar energy conversion due to being chemically and biologically inert and environmentally friendly
As mentioned in the above discussion, H2O2 is important in photocatalysis at TiO2, amorphous TiO2 offers some enhancement of activity and noting the yellow colour of the catalytically active titanium-peroxo species in the TS1/H2O2/H2O system, it would be interesting to see if yellow amorphous titanium-peroxo species can act as a photocatalyst under visible light
We investigate the visible-light-driven photoactivity of yellow amorphous TiO2 prepared by a peroxide-based route, using titanium nitride (TiN) as a precursor
Summary
Titaniumdioxide(TiO2)has been the prevailing material in the fields of photocatalysis and solar energy conversion due to being chemically and biologically inert and environmentally friendly. Yellow TiO2 prepared by nitrogen doping has been regarded as a visible-light-sensitive photocatalyst [1,2,3,4] as well as Cr or V doped TiO2 [5, 6]. As mentioned in the above discussion, H2O2 is important in photocatalysis at TiO2, amorphous TiO2 offers some enhancement of activity and noting the yellow colour of the catalytically active titanium-peroxo species in the TS1/H2O2/H2O system, it would be interesting to see if yellow amorphous titanium-peroxo species can act as a photocatalyst under visible light. We investigate the visible-light-driven photoactivity of yellow amorphous TiO2 (hereinafter referred to as “yam-TiO2”) prepared by a peroxide-based route, using titanium nitride (TiN) as a precursor
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