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Citation: Junli WANG, Miaomiao JING, Danyang LIU, Yurun DAI, Qiang ZHAO, Zuopeng LI, Yong GUO. Constructing highly efficient Z-scheme MIL-101(Fe)/Cu2O heterojunction photocatalysts by interface coupling and their mechanism for tetracycline degradation[J]. Chinese Journal of Inorganic Chemistry, ;2026, 42(7): 1555-1568. doi: 10.11862/CJIC.20260004 shu

Constructing highly efficient Z-scheme MIL-101(Fe)/Cu2O heterojunction photocatalysts by interface coupling and their mechanism for tetracycline degradation

  • 1.

    School of Chemistry and Chemical Engineering, Shanxi Datong University, Datong, Shanxi 037009, China

  • 2.

    Shanxi Province Union Laboratory of Clean Energy Materials, Shanxi Datong University, Datong, Shanxi 037009, China

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  • A series of MIL-101(Fe)/Cu2O heterojunction photocatalysts was successfully constructed by coupling highly active dodecahedral Cu2O with MIL-101(Fe) through a co-precipitation method. The catalytic performance of these materials was systematically evaluated under visible light using tetracycline as the target pollutant. The results indicated that when the mass fraction of MIL-101(Fe) was 20%, the composite material exhibited the best catalytic performance, with a tetracycline degradation rate of up to 87.37% after 100 min of illumination, significantly enhancing the photocatalytic degradation efficiency. The significant improvement in photocatalytic performance was mainly attributed to the tight interface coupling between the two components. Transient photocurrent response and electrochemical impedance spectroscopy (EIS) demonstrated that the introduction of MIL-101(Fe) greatly enhanced the electron conduction ability of the composite system and accelerated charge migration. On the other hand, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), UV-Visible diffuse reflectance spectra (UV-Vis DRS), and Mott-Schottky characterizations, combined with electron paramagnetic resonance (EPR) tests, confirmed the formation of an effective Z-scheme heterojunction between the two components. This Z-scheme heterojunction photocatalyst not only promotes the spatial separation of photogenerated electron-hole pairs but also retains the stronger redox ability of the composite material, thereby synergistically achieving efficient degradation of pollutants.
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