2 step photoreaction system using photocatalytic microreactors with separated oxidation/reduction channels

2020 Fiscal Year Final Research Report

• Project/Area Number: 18K04825
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27020:Chemical reaction and process system engineering-related
• Research Institution: Kyoto University
• Principal Investigator: Nagamine Shinsuke 京都大学, 工学研究科, 准教授 (30335583)
• Co-Investigator(Kenkyū-buntansha): 引間 悠太 京都大学, 工学研究科, 助教 (50721362)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: Photocatalyst / Microreactor

Outline of Final Research Achievements

We aimed to develop the two step photoreaction system composed of two photocatalytic microreactors having separated oxidation/reduction channels. In this system, redox mediator (Fe3+/Fe2+) is circulating between the two microreactors employing the visible-light responsive photocatalysts with different energy levels. The microreactor with ferric oxide photocatalyst could induce the oxidation of citric acid and the reduction of ferric ion in the different channels.Graphitic carbon nitride worked as a photocatalyst for the oxidation of ferrous ion and the reduction of p-nitrophenol. The completion of two step photoreaction system requires further study especially on improving the performance of microreactors having separated oxidation/reduction channels employing graphitic carbon nitride.

Free Research Field

化学工学

Academic Significance and Societal Importance of the Research Achievements

光触媒反応において可視光の利用効率を高める手段として，エネルギー準位の異なる２種類の光触媒に酸化／還元の役割を分割する２段階光励起法がある。２段階光励起法は主に液中に光触媒を分散させた回分式反応器を用いて行われており，反応プロセスの連続化，液体生成物の分離回収の２つの課題が残されている。本研究では，申請者の考案した酸化／還元分割型マイクロリアクターを用いた２段階光励起システムの構築に取り組み，光触媒としてFe2O3, g-C3N4がこのシステムに有効である可能性を見出した。この成果は２段階光励起プロセスにおける連続化，生成物の分離の実現に向けて意義深いものである。