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<p>The synergistic combination of elemental doping and heterostructure engineering offers an effective strategy to overcome inherent limitations of conventional graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) in photocatalyst application, particularly insufficient active sites, rapid charge carrier recombination, and narrow light absorption. This study introduces carbon self-doping into g-C<sub>3</sub>N<sub>4</sub>, followed by self-assembly with band-matched ZnIn<sub>2</sub>S<sub>4</sub>(ZIS) to construct an S-scheme C-g-C<sub>3</sub>N<sub>4</sub>/ZnIn<sub>2</sub>S<sub>4</sub>(CCN@ZIS) heterojunction. Multimodal characterization confirms carbon incorporation modifies the band structure of g-C<sub>3</sub>N<sub>4</sub>, induces <i>n</i>–<i>π</i>* transitions, and creates defect/impurity levels, significantly enhancing light absorption. Crucially, the S-scheme charge transfer mechanism enables efficient separation of photogenerated carriers, substantially boosting photocatalytic performance. These structural optimizations enable the CCN@ZIS-2 composite to achieve 94.3% carbendazim (CBZ) degradation within 60&#xa0;min—outperforming CCN and ZIS by factors of 1.19 and 1.31, respectively. This work provides novel insights for high-efficiency photocatalytic degradation of pesticide in water environment.</p>

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Rational design of S-scheme carbon-doped graphitic carbon nitride/ZnIn2S4 heterojunction with enhanced photocatalytic performance for Carbendazim

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Chao Liu,
  • Yanyan Jiang,
  • Yuan Wei,
  • Shiming Jia,
  • Huaide Liu,
  • Ziyan Yu,
  • Junfeng Sun,
  • Zhiqi Kang,
  • Guanghui Cheng,
  • Gaofeng Shi,
  • Guoying Wang

摘要

The synergistic combination of elemental doping and heterostructure engineering offers an effective strategy to overcome inherent limitations of conventional graphitic carbon nitride (g-C3N4) in photocatalyst application, particularly insufficient active sites, rapid charge carrier recombination, and narrow light absorption. This study introduces carbon self-doping into g-C3N4, followed by self-assembly with band-matched ZnIn2S4(ZIS) to construct an S-scheme C-g-C3N4/ZnIn2S4(CCN@ZIS) heterojunction. Multimodal characterization confirms carbon incorporation modifies the band structure of g-C3N4, induces n–π* transitions, and creates defect/impurity levels, significantly enhancing light absorption. Crucially, the S-scheme charge transfer mechanism enables efficient separation of photogenerated carriers, substantially boosting photocatalytic performance. These structural optimizations enable the CCN@ZIS-2 composite to achieve 94.3% carbendazim (CBZ) degradation within 60 min—outperforming CCN and ZIS by factors of 1.19 and 1.31, respectively. This work provides novel insights for high-efficiency photocatalytic degradation of pesticide in water environment.