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<p>To address the issue of limited degradation efficiency due to rapid carrier recombination in piezoelectric catalysis, this study designed a ternary heterojunction structure of ZnO/CuO@UiO-66-NH<sub>2</sub>. A ZnO/CuO heterointerface was constructed on the surface of UiO-66-NH<sub>2</sub> via a hydrothermal method, forming a composite piezoelectric catalytic system with abundant active sites and enhanced built-in electric fields. Theoretical analysis indicated that UiO-66-NH<sub>2</sub>, as a carrier, not only significantly increased the specific surface area of the material but also cooperatively regulated the charge distribution in the heterojunction region. Under ultrasonic vibration, the piezoelectric potential generated by the ZnO/CuO heterojunction effectively drove carrier separation, thereby significantly enhancing the redox reaction efficiency. Under dark conditions, the 30-minute degradation rate of RhB by this material reached 99.7%, with a rate constant of 0.09435&#xa0;min⁻¹, far superior to the pure ZnO/CuO system. Additionally, ZnO/CuO@UiO-66-NH<sub>2</sub> demonstrated excellent catalytic performance and cycling stability in the degradation of methyl orange and methylene blue. Band structure and radical trapping experiments confirmed that hydrogen radicals (·H) and superoxide radicals (·O<sub>2</sub>⁻) were the main active species in the degradation process. This research provides new material ideas for the development of efficient and stable heterojunction piezoelectric catalysts and offers potential pathways for the construction of integrated systems for dye wastewater treatment and energy conversion.</p> Graphical Abstract <p></p>

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Construction of a Ternary ZnO/CuO@UiO-66-NH2 Heterojunction for Efficient Piezo-Electric Degradation of Rhodamine B

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Yueyue Guan,
  • Xianglong Zeng,
  • Shuming Liu,
  • Kai Yao,
  • Zhenhui Hu,
  • Longhao Xiao,
  • Zheng Fang,
  • Yongsheng Yang,
  • Hongjun Liu

摘要

To address the issue of limited degradation efficiency due to rapid carrier recombination in piezoelectric catalysis, this study designed a ternary heterojunction structure of ZnO/CuO@UiO-66-NH2. A ZnO/CuO heterointerface was constructed on the surface of UiO-66-NH2 via a hydrothermal method, forming a composite piezoelectric catalytic system with abundant active sites and enhanced built-in electric fields. Theoretical analysis indicated that UiO-66-NH2, as a carrier, not only significantly increased the specific surface area of the material but also cooperatively regulated the charge distribution in the heterojunction region. Under ultrasonic vibration, the piezoelectric potential generated by the ZnO/CuO heterojunction effectively drove carrier separation, thereby significantly enhancing the redox reaction efficiency. Under dark conditions, the 30-minute degradation rate of RhB by this material reached 99.7%, with a rate constant of 0.09435 min⁻¹, far superior to the pure ZnO/CuO system. Additionally, ZnO/CuO@UiO-66-NH2 demonstrated excellent catalytic performance and cycling stability in the degradation of methyl orange and methylene blue. Band structure and radical trapping experiments confirmed that hydrogen radicals (·H) and superoxide radicals (·O2⁻) were the main active species in the degradation process. This research provides new material ideas for the development of efficient and stable heterojunction piezoelectric catalysts and offers potential pathways for the construction of integrated systems for dye wastewater treatment and energy conversion.

Graphical Abstract