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<p>The construction of heterostructures has been extensively investigated to enhance carrier separation efficiency and photocatalytic performance in semiconductors. Nevertheless, these systems continue to encounter challenges in sustaining the generation of electron-hole pairs and redox capabilities. In this study, we successfully synthesised a 2D/3D ZnIn<sub>2</sub>S<sub>4</sub>/K<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> S-scheme heterojunction photocatalyst featuring a core-shell structure. This was achieved by coating ZnIn<sub>2</sub>S<sub>4</sub> (ZIS) nanosheets onto the surface of K<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> (PK) micrometre particles via a two-step hydrothermal method. Comprehensive characterisation analyses reveal that the S-scheme heterojunction facilitates the recombination of carriers at the interface between adjacent conduction and valence bands through an interfacial electric field. This mechanism effectively preserves the strong redox potential of carriers in both the high-conduction and low-valence bands. Consequently, ZIS/PK demonstrates remarkable performance in the degradation of doxycycline hydrochloride (DCH), with a reaction rate constant of 0.0547&#xa0;min<sup>− 1</sup>. In comparison to the individual photocatalysts ZIS and PK, the degradation rate has increased by 7.01 times and 17.09 times, respectively, thereby significantly enhancing photocatalytic degradation efficiency and indicating broad application prospects. Future research should focus on innovative strategies for the development of efficient S-scheme heterojunction photocatalysts.</p>

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Rational design of an S-scheme 2D/3D ZnIn2S4/K3PW12O40 heterojunction for enhanced photocatalytic antibiotic degradation

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Pengxi Li,
  • Zhonghong Liu,
  • Xu Cheng,
  • Rui Fan,
  • Jingjing Yang

摘要

The construction of heterostructures has been extensively investigated to enhance carrier separation efficiency and photocatalytic performance in semiconductors. Nevertheless, these systems continue to encounter challenges in sustaining the generation of electron-hole pairs and redox capabilities. In this study, we successfully synthesised a 2D/3D ZnIn2S4/K3PW12O40 S-scheme heterojunction photocatalyst featuring a core-shell structure. This was achieved by coating ZnIn2S4 (ZIS) nanosheets onto the surface of K3PW12O40 (PK) micrometre particles via a two-step hydrothermal method. Comprehensive characterisation analyses reveal that the S-scheme heterojunction facilitates the recombination of carriers at the interface between adjacent conduction and valence bands through an interfacial electric field. This mechanism effectively preserves the strong redox potential of carriers in both the high-conduction and low-valence bands. Consequently, ZIS/PK demonstrates remarkable performance in the degradation of doxycycline hydrochloride (DCH), with a reaction rate constant of 0.0547 min− 1. In comparison to the individual photocatalysts ZIS and PK, the degradation rate has increased by 7.01 times and 17.09 times, respectively, thereby significantly enhancing photocatalytic degradation efficiency and indicating broad application prospects. Future research should focus on innovative strategies for the development of efficient S-scheme heterojunction photocatalysts.