Direct Z-scheme construction of g-C3N4 quantum dots / TiO2 nanoflakes for efficient photocatalysis
[Display omitted] •TiO2 nanoflakes/g-C3N4 QDs were prepared by a facile calcination process.•g-C3N4 QDs were intimately hybridized with the giant TiO2 nanoflakes.•Mechanism of charge transfer and separation in Z-scheme heterojunction discussed.•High photocatalytic degradation and H2 evolution activi...
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| Published in | Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 430; p. 132861 |
|---|---|
| Main Authors | , , , , , , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
15.02.2022
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| Subjects | |
| Online Access | Get full text |
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| Abstract | [Display omitted]
•TiO2 nanoflakes/g-C3N4 QDs were prepared by a facile calcination process.•g-C3N4 QDs were intimately hybridized with the giant TiO2 nanoflakes.•Mechanism of charge transfer and separation in Z-scheme heterojunction discussed.•High photocatalytic degradation and H2 evolution activity were realized.
The rapid recombination rate of photogenerated carriers in TiO2 has been limiting the photocatalytic performance. Herein, TiO2 thin flakes modified by g-C3N4 quantum dots (g-C3N4 QDs) were fabricated successfully through a facile thermal treatment of restacked single-layer nanosheets of Ti1.73O41.07- in the presence of urea as a source of g-C3N4 QDs. Characterizations showed that g-C3N4 QDs with a size of ~10 nm were homogeneously deposited on the surface of TiO2 thin flakes. Quenching experiments of •OH radicals and the detection of radicals by EPR certified the direct Z-scheme heterojunctions between g-C3N4 QDs and TiO2 flakes. The TiO2 nanoflakes/g-C3N4 QDs hybrid exhibited excellent activity for the photocatalytic hydrogen evolution from a methanol solution and the degradation of RhB due to the enhanced charge separation efficiency and improved light absorption in the direct Z-scheme heterojunctions. This study demonstrates that the rational design of heterojunction is effective for attaining the superior photocatalytic performance. |
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| AbstractList | [Display omitted]
•TiO2 nanoflakes/g-C3N4 QDs were prepared by a facile calcination process.•g-C3N4 QDs were intimately hybridized with the giant TiO2 nanoflakes.•Mechanism of charge transfer and separation in Z-scheme heterojunction discussed.•High photocatalytic degradation and H2 evolution activity were realized.
The rapid recombination rate of photogenerated carriers in TiO2 has been limiting the photocatalytic performance. Herein, TiO2 thin flakes modified by g-C3N4 quantum dots (g-C3N4 QDs) were fabricated successfully through a facile thermal treatment of restacked single-layer nanosheets of Ti1.73O41.07- in the presence of urea as a source of g-C3N4 QDs. Characterizations showed that g-C3N4 QDs with a size of ~10 nm were homogeneously deposited on the surface of TiO2 thin flakes. Quenching experiments of •OH radicals and the detection of radicals by EPR certified the direct Z-scheme heterojunctions between g-C3N4 QDs and TiO2 flakes. The TiO2 nanoflakes/g-C3N4 QDs hybrid exhibited excellent activity for the photocatalytic hydrogen evolution from a methanol solution and the degradation of RhB due to the enhanced charge separation efficiency and improved light absorption in the direct Z-scheme heterojunctions. This study demonstrates that the rational design of heterojunction is effective for attaining the superior photocatalytic performance. |
| ArticleNumber | 132861 |
| Author | Xu, Chengqun Pan, Hui Liu, Xiaolu Yang, Yuchen Huang, Janjer Ma, Renzhi Sakai, Nobuyuki Sasaki, Takayoshi Lin, Shiyin Li, Dezhi Yang, Jiale |
| Author_xml | – sequence: 1 givenname: Chengqun surname: Xu fullname: Xu, Chengqun organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 2 givenname: Dezhi surname: Li fullname: Li, Dezhi organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 3 givenname: Xiaolu surname: Liu fullname: Liu, Xiaolu organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 4 givenname: Renzhi surname: Ma fullname: Ma, Renzhi organization: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan – sequence: 5 givenname: Nobuyuki surname: Sakai fullname: Sakai, Nobuyuki organization: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan – sequence: 6 givenname: Yuchen surname: Yang fullname: Yang, Yuchen organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 7 givenname: Shiyin surname: Lin fullname: Lin, Shiyin organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 8 givenname: Jiale surname: Yang fullname: Yang, Jiale organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 9 givenname: Hui surname: Pan fullname: Pan, Hui email: huipan@um.edu.mo organization: Institute of Applied Physics and Materials Engineering, University of Macau, Macao SAR 999078, PR China – sequence: 10 givenname: Janjer surname: Huang fullname: Huang, Janjer organization: School of Applied Physics and Materials, Wuyi University, Jiangmen 529020, PR China – sequence: 11 givenname: Takayoshi surname: Sasaki fullname: Sasaki, Takayoshi email: SASAKI.Takayoshi@nims.go.jp organization: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan |
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| Keywords | Photodegradation Photocatalytic hydrogen evolution g-C3N4 QDs TiO2 nanoflakes Direct Z-scheme |
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