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<p>Photocatalytic technology directly converts solar energy into chemical energy without producing secondary pollution, offering significant potential for environmental remediation. In this study, WO₃ was chosen as the substrate because of its ideal valence band position. A novel S-scheme heterojunction photocatalyst (NUOW10) was obtained by integrating WO₃ with NH₂-UiO-66 via a secondary hydrothermal process. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) analyses confirmed the successful synthesis of the NUOW10 photocatalytic material, revealing its good crystalline properties. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results showed that NH₂-UiO-66 was uniformly distributed on the WO₃ substrate surface, forming a compact heterogeneous structure. Brunauer–Emmett–Teller (BET) revealed that NUOW10 has a high specific surface area of up to 837.37 m<sup>2</sup>/g and that its porous structure provides an abundance of active sites for photocatalytic reactions. The experimental results demonstrate that the NUOW10 composite achieves an exceptional tetracycline (TC) degradation rate of 93% under simulated sunlight, with ·O₂⁻ acting as the predominant active species. Furthermore, the material maintains a degradation efficiency above 80% after five cycles, indicating its stability. This study offers new insights into the optimization of WO₃-based photocatalysts, laying a theoretical and practical foundation for the development of efficient and stable wastewater treatment technologies.</p>

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Construction of an S-scheme NH2-UiO-66/WO3 heterojunction for enhanced photocatalytic performance

  • 期刊论文

  • 发表日期：

    2025年10月19日

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  • Daoxin Wu,
  • Nan Chen,
  • Haixia Tong,
  • Jun Wang,
  • Zhuo Tong,
  • Wenzhao Liu,
  • Mingming Dang

摘要

Photocatalytic technology directly converts solar energy into chemical energy without producing secondary pollution, offering significant potential for environmental remediation. In this study, WO₃ was chosen as the substrate because of its ideal valence band position. A novel S-scheme heterojunction photocatalyst (NUOW10) was obtained by integrating WO₃ with NH₂-UiO-66 via a secondary hydrothermal process. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) analyses confirmed the successful synthesis of the NUOW10 photocatalytic material, revealing its good crystalline properties. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results showed that NH₂-UiO-66 was uniformly distributed on the WO₃ substrate surface, forming a compact heterogeneous structure. Brunauer–Emmett–Teller (BET) revealed that NUOW10 has a high specific surface area of up to 837.37 m2/g and that its porous structure provides an abundance of active sites for photocatalytic reactions. The experimental results demonstrate that the NUOW10 composite achieves an exceptional tetracycline (TC) degradation rate of 93% under simulated sunlight, with ·O₂⁻ acting as the predominant active species. Furthermore, the material maintains a degradation efficiency above 80% after five cycles, indicating its stability. This study offers new insights into the optimization of WO₃-based photocatalysts, laying a theoretical and practical foundation for the development of efficient and stable wastewater treatment technologies.