Photocatalytic Reduction Reaction in Air Using Au Nanoparticle-Loaded TiO2
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Tatsuhiko Ihara
,
Kazufumi Akamatsu
Abstract
We examined the in-air photocatalytic property of nanometer-sized Au particle-loaded TiO2 (Au/TiO2) with acetone. We also investigated the effects of two loading methods (hydrazine reduction (HR) method and deposition precipitation (DP) methods) along with the type of support TiO2 (P-25 and A-100) on the characteristics of photocatalytic reaction. Prepared Au/TiO2 exhibited a typical violet or purple color as a result of surface plasmon absorption, and the color tone was affected by the loading method, type of support TiO2, and post-treatment such as UV-light irradiation. Reaction in air with acetone generated not only CO2 but also CH4, C2H6, and H2. It was found that the formation amount of CH4 and C2H6 showed higher yield when Au nanoparticles (NPs) with smaller average particle size d and smaller standard deviation σ were loaded. And yet the yield increased with the increase of the surface area, which is in contact with TiO2 grain surface. Au-DP/A-100 prepared with the DP method using A-100 as the support TiO2 yielded the highest amounts, 1.36 and 0.61 μmol for CH4 and C2H6, respectively, after UV irradiation for 360 min. The conversion was 9.49% from acetone to the reduction products of CH4 and C2H6. Our observation of Au-DP/A-100, which was exposed to UV-light in air for a week, using a transmission electron microscope, showed that the size of Au NP decreased by half with a good dispersion state. This phenomenon suggests that an Au NP acts as a reductant for the photocatalytic oxidation and is thought to be an important factor in generating CH4 and C2H6 in air.
© 2016 by Walter de Gruyter Berlin/Boston
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