Fabrication of broadband light response high-functional photocatalysts by combination of catalyst chemistry and plasma engineering

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14482
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Catalyst/Resource chemical process
• Research Institution: Osaka City University
• Principal Investigator: Yoshida Tomoko 大阪市立大学, 複合先端研究機構, 教授 (90283415)
• Co-Investigator(Renkei-kenkyūsha): Kajita Shin 名古屋大学, 未来材料・システム研究所, 准教授 (00455297)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: タングステンナノ構造 / 光触媒

Outline of Final Research Achievements

We investigated the photocatalysis of dendritic nanostructured WO3/W composite materials fabricated by He plasma irradiation to tungsten plates, followed by the surface oxidation. The samples promoted the decolorization reaction of methylene blue (MB) aqueous solution under near infrared (NIR) light irradiation. To verify the photocatalysis of the samples, reaction products were analysed by S K-edge XANES measurements for the MB solution kept with the samples under the light irradiation. By the light irradiation, the π*(S-C) and *(S-C) peaks in the XANES spectra reduced and a new peak originated from SO42- species was clearly observed, suggesting that S-C bonds in a MB molecule are broken by the NIR light irradiation and finally the sulfur species exists in the solution in the state of SO42-; ion. These results demonstrate that the photocatalytic decomposition of MB molecules really proceeds over WO3/W composite materials even under NIR light irradiation.

Free Research Field

触媒化学