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Post-annealed graphite carbon nitride nanoplates obtained by sugar-assisted exfoliation with improved visible-light photocatalytic performance

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Title: Post-annealed graphite carbon nitride nanoplates obtained by sugar-assisted exfoliation with improved visible-light photocatalytic performance
Authors: Liu, Wei Browse this author
Yanase, Takashi Browse this author
Iwasa, Nobuhiro Browse this author
Mukai, Shin Browse this author
Iwamura, Shinichiro Browse this author
Nagahama, Taro Browse this author →KAKEN DB
Shimada, Toshihiro Browse this author →KAKEN DB
Keywords: g-C3N4 nanoplates
Thermal treatment
Photocatalytic activity
Issue Date: 1-May-2020
Publisher: Elsevier
Journal Title: Journal of colloid and interface science
Volume: 567
Start Page: 369
End Page: 378
Publisher DOI: 10.1016/j.jcis.2020.02.031
Abstract: Two-dimensional (2D) graphitic carbon nitride (g-C3N4) nanoplates (CNNP) have become a hot research topic in photocatalysis due to their small thickness and large specific surface area that favors charge transport and catalytic surface reactions. However, the wide application of 2D g-C3N4 nanoplates prepared by ordinary methods suffers from increased band gaps with a poor solar harvesting capability caused by the strong quantum confinement effect and reduced conjugation distance. In this paper, a facile approach of exfoliation and the following fast thermal treatment of the bulk g-C3N4 is proposed to obtain a porous few-layered g-C3N4 with nitrogen defects. Due to the preferable crystal, textural, optical and electronic structures, the as-obtained porous CNNP demonstrated a significantly improved photocatalytic activity towards water splitting than the bulk g-C3N4 and even the 3 nm-thick CNNP obtained by sugarassisted exfoliation of the bulk g-C3N4. The difference in the enhancement factors between the H2O splitting and organic decomposition has revealed the effect of N defects. This study offers insightful outlooks on the scalable fabrication of a porous few-layered structure with a promoted photocatalytic performance. (C) 2020 Elsevier Inc. All rights reserved.
Rights: ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 島田 敏宏

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