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    2D Porous N-Deficient g-C3N4 Nanosheet Decorated with CdS Nanoparticles for Enhanced Visible-Light-Driven Photocatalysis

    Year: 2020

    Journal: ACS Sustain. Chem. Eng., Volume 8, NOV 16, page 16897–16904

    Authors: Liu, Hui; Cheng, Dang-guo; Chen, Fengqiu; Zhan, Xiaoli

    Organizations: National Key R&D Program of China [2016YFA0202900]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21878259, 21622606]; Zhejiang Provincial Natural Science Foundation of ChinaNatural Science Foundation of Zhejiang Province [LR18B060001]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities

    Keywords: g-C3N4; visible-light-driven photocatalysis; hydrogen; charge separation; water

    Graphitic carbon nitride (g-C3N4), as a promising visible-light-driven photocatalyst, has attracted extensive attention. However, its photocatalytic performance is limited by its weak light absorption and fast recombination of charge carriers. Herein, a two-dimensional (2D) porous N-deficient g-C3N4 nanosheet (CNNS) was fabricated through molten salt-assisted thermal polycondensation. The remarkable porous nanosheet structure together with the N-deficiency of CNNS played multiple roles, causing a higher specific surface area, better hydrophilicity, and narrowed band gap, thus enabling extended visible light absorption and improved photogenerated charge separation efficiency. As a consequence, the noble-metal-free photocatalyst formed using CNNS and CdS nanoparticles exhibited a significantly enhanced visible-light-driven photocatalytic H-2 production rate of 326 mu mol h(-1) (CdS/CNNS), which is about 8.8 times higher than that of a bulk-g-C3N4-based CdS/BCN photocatalyst (37 mu mol h(-1)). Moreover, with a relatively low Pt content (1 wt %) as a cocatalyst, the H-2 evolution rate further increased up to 2323 mu mol h(-1) (Pt-CdS/CNNS). This work is expected to be helpful in fabricating efficient g-C3N4 photocatalysts.
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