2017年第78回応用物理学会秋季学術講演会

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9 応用物性 » 9.2 ナノワイヤ・ナノ粒子

[7p-PA7-1~25] 9.2 ナノワイヤ・ナノ粒子

2017年9月7日(木) 13:30 〜 15:30 PA7 (国際センター1F)

13:30 〜 15:30

[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.