[7p-PA7-1~25] 9.2 ナノワイヤ・ナノ粒子

▲ [7p-PA7-6] Enhancement of Catalytic Activity of Hydrogenated Titanium Dioxide Nanofibers Photocatalyst by Metal Modification

〇(D)Weikang Huang¹、Poyeh Wu¹、Mingchung Wu¹ (1.Chang Gung Univ.)

キーワード：metal decorated, hydrogenation, TiO2 nanofiber

Many researchers have used the hydrogenated process to modify the bandgap of TiO₂ to improve the visible-active photocatalytic performance. H:TiO₂ is usually prepared under the high-pressure hydrogen condition for long calcination time. Since hydrogen gas is highly flammable, the preparation process with high pressure and high temperature can be dangerous for large-scale production. Various metals and metal oxides decorated on TiO₂ surface is an efficient method to obtain the high activity photocatalysts. However, the study for using metal and metal oxide decorated on hydrogenated TiO₂ nanofibers by one-step thermal reduction process is still rarely. In this study, we successfully synthesized a series of metal-H:TiO₂ NFs (Ag, Co, Cr, Cu, Fe, Ni, Pd, Pt, and Y) by combining the hydrothermal synthesis and wet-impregnation method, followed by one-step heat treatment in low H₂ partial pressure. The optimal calcination condition is achieved to enhance the photocatalytic performance. For photodegradation of organic dye and photocatalytic hydrogen production under UV irradiation were measured and discussed in detail. Ag-H:TiO₂ NFs (~0.339 min^-1) exhibits the faster decolorization rate than non-metal decorated H:TiO₂-650 NFs (~0.111 min^-1) for the degradation of brilliant green. With metal decoration, the results indicate that both Pd and Pt decoration can facilitate photocatalytic hydrogen production under UV-A irradiation. The hydrogen evolution rates were as high as 17,000 μmol/g·hr and 9,000 μmol/g·hr respectively. Ag-H:TiO₂ NFs and Pd-H:TiO₂ NFs represent the typical metal-semiconductor heterostructure that could be widely developed for the applications in photodegradation of organic dyes and photocatalytic hydrogen production.