Adsorption and degradation functions of titania nanoparticles modified by photocatalytic reaction

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05472
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Shinshu University
• Principal Investigator: NISHIKIORI Hiromasa 信州大学, 学術研究院工学系, 教授 (00332677)
• Research Collaborator: NAGAYA Satoshi
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 光物性 / 光触媒 / ナノ材料

Outline of Final Research Achievements

Silica and silica-alumina nanoparticles were formed as adsorbents on anatase-type titania particles immersed in alkoxide solutions during UV irradiation. The concentration of the basic OH groups on the titania surface increased during the UV irradiation. The basicity promoted hydrolysis and subsequent polymerization of the alkoxides on the titania surface on which the silica and silica-alumina layers were deposited. The titania particles loading a small amount of the thin silica and silica-alumina layers exhibited a higher photocatalytic activity for organic molecule degradation and photofuel cell performance than the original titania. The silica-modified titania particles efficiently adsorbed, then degraded the molecules on the surface. Therefore, the photocatalyzed surface modification in this study was significantly useful to activate the titania surface.

Free Research Field

光物理化学

Academic Significance and Societal Importance of the Research Achievements

光触媒作用により有機廃棄物を分解しつつ電力を得る光燃料電池用の作用電極の高性能化に関する基礎研究を行った。チタニア粒子上に、その光触媒能を利用してシリカおよびシリカアルミナナノ粒子を吸着剤として形成した。この技術を用いて作製した作用電極により、デンプンを燃料物質として、光電流を発生させ電力を得るための方法を確立した。さらに、デンプンの酸化反応の素過程を観測し、反応機構および反応効率を向上させるための条件を明らかにした。