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<p>Tetracycline poses a serious threat to the ecosystems even if the concentration is very low due to its structural stability. In this work, a series of magnetic separable Fe<sub>3</sub>O<sub>4</sub>/ZnO/g-C<sub>3</sub>N<sub>4</sub> composite with excellent degrading tetracycline performance were prepared. And, repeated calcination method was used to strengthen the bonding effect of single component improving the formation of heterojunction. Electrochemical analysis confirmed that the ZnO/g-C<sub>3</sub>N<sub>4</sub> and Fe<sub>3</sub>O<sub>4</sub>/ZnO/g-C<sub>3</sub>N<sub>4</sub> heterojunctions were generated, effectively accelerating the electron separation and transfer in photocatalytic process. The characterization results also showed that ZnO and Fe<sub>3</sub>O<sub>4</sub> nanoparticles are evenly distributed on the surface of g-C<sub>3</sub>N<sub>4</sub>. With the increase of the loading mass concentration of ZnO/g-C<sub>3</sub>N<sub>4</sub>, the degradation rate of tetracycline on Fe<sub>3</sub>O<sub>4</sub>/ZnO/g-C<sub>3</sub>N<sub>4</sub> composite increased and then decreased. The degradation rate of tetracycline on optimal Fe<sub>3</sub>O<sub>4</sub>/ZnO/g-C<sub>3</sub>N<sub>4</sub> composite reached to 94.50% while the TC mineralization rate reached to 61.61% under visible light irradiation for 120&#xa0;min, exhibiting excellent photocatalytic performance. Due to the effect of Fe<sub>3</sub>O<sub>4</sub>, Fe<sub>3</sub>O<sub>4</sub>/ZnO/g-C<sub>3</sub>N<sub>4</sub> materials exhibited good magnetic property, which is beneficial to separation and recovery of photocatalysts. The reusability experiment showed that the degradation rate of tetracycline was 80.66% after five cycles, displaying good reusability.</p>

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Enhancement of the photocatalytic degradation performance for tetracycline of magnetic Fe3O4/ZnO/g-C3N4 composites by strengthening the bonding effect

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Lijuan Han,
  • Keyi Chai,
  • Xinyu Du,
  • Xiangtong Wang,
  • Ping Zhang,
  • Xiaotian Wang

摘要

Tetracycline poses a serious threat to the ecosystems even if the concentration is very low due to its structural stability. In this work, a series of magnetic separable Fe3O4/ZnO/g-C3N4 composite with excellent degrading tetracycline performance were prepared. And, repeated calcination method was used to strengthen the bonding effect of single component improving the formation of heterojunction. Electrochemical analysis confirmed that the ZnO/g-C3N4 and Fe3O4/ZnO/g-C3N4 heterojunctions were generated, effectively accelerating the electron separation and transfer in photocatalytic process. The characterization results also showed that ZnO and Fe3O4 nanoparticles are evenly distributed on the surface of g-C3N4. With the increase of the loading mass concentration of ZnO/g-C3N4, the degradation rate of tetracycline on Fe3O4/ZnO/g-C3N4 composite increased and then decreased. The degradation rate of tetracycline on optimal Fe3O4/ZnO/g-C3N4 composite reached to 94.50% while the TC mineralization rate reached to 61.61% under visible light irradiation for 120 min, exhibiting excellent photocatalytic performance. Due to the effect of Fe3O4, Fe3O4/ZnO/g-C3N4 materials exhibited good magnetic property, which is beneficial to separation and recovery of photocatalysts. The reusability experiment showed that the degradation rate of tetracycline was 80.66% after five cycles, displaying good reusability.