☆ 4.7 Article

Photo-assisted self-assembly synthesis of all 2D-layered heterojunction photocatalysts with long-range spatial separation of charge-carriers toward photocatalytic redox reactions

CHEMICAL ENGINEERING JOURNAL (2022)

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Journal

CHEMICAL ENGINEERING JOURNAL
Volume 431, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134001

Keywords

Photocatalysis; Heterojunction photocatalysts; Charge separation; 2D materials; H-2 generation

Categories

Engineering, Environmental Engineering, Chemical

Funding

  1. National Natural Science Foundation of China [12074055, 51772041, 62005036]
  2. National Special Support Plan for high-level Talents, Liaoning Revitalization Talents Program [XLYC1807176]
  3. Liaoning BaiQianWan Talents Pro-gram, Dalian Science Foundation for Distinguished Young Scholars [2018RJ05]
  4. Natural Science Foundation of Liaoning Province [2020-MZLH-15]
  5. Educational Committee Foundation of Liaoning Province [LJYT201907]
  6. Program for Dalian Excellent Talents [2020RQ131]

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Constructing heterojunction photocatalysts is an ingenious approach to adjust the lifetimes of charge carriers for highly efficient photocatalytic applications. In this study, an all 2D-layered heterojunction photocatalyst of SnS2/RGO/g-C3N4 nanosheets was synthesized using a photo-assisted self-assembly strategy, which exhibited remarkable enhancement in photocatalytic performance.
Constructing heterojunction photocatalysts has been proven as an ingenious tactic to adjust the lifetimes of the higher redox-active charge-carriers toward highly-efficient photocatalytic applications. Numerous recent efforts focused on the short-range spatial separation of charge-carriers in the heterojunction photocatalysts. However, engineering a long-range transfer channel in the well-designed heterojunction photocatalyst to further spatially separate the charge-carriers is still a huge challenge. In this contribution, we developed a facile photo-assisted self-assembly strategy to synthesize the all 2D-layered heterojunction photocatalysts of SnS2/RGO/g-C3N4 nanosheets (NSs). During the synthesis process, the precursor of 2D graphene-oxide (GO) NSs was converted into the reduced GO (RGO) NSs by the photoactive semiconductors of 2D SnS2 and g-C3N4 NSs. Meanwhile, the above two 2D semiconductors were simultaneously anchored onto the surface of the RGO NSs. Upon visible-light irradiation of the synthesized SnS2/RGO/g-C3N4 NSs, the 2D RGO component could provide a broad electron transfer surface for the long-range spatial-separation of charge-carriers in the semiconductor components of the NSs. Thus, this all 2D-layered heterojunction photocatalyst exhibited -9.2 and -4.6-fold enhancement on the photocatalytic oxidation degradation of the organic dye, and -68 and -3.4-fold enhancement on photo catalytic protons reduction as compared to the pure SnS2 and g-C3N4 NSs, respectively.

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