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<p>To identify an efficient photocatalyst for the removal of <i>Escherichia coli</i> (<i>E. coli</i>) contamination, ZnO was sythesized <i>via</i> a hydrothermal method. A series of nanocomposites with varying mass ratios (ZnCo<sub>2</sub>O<sub>4</sub>-ZnO) was fabricated by anchoring ZnCo<sub>2</sub>O<sub>4</sub> onto ZnO using an <i>in-situ</i> growth technique, with the objective of enhancing ZnO’s photocatalytic performance. The resulting S-scheme heterojunction ZnCo<sub>2</sub>O<sub>4</sub>-ZnO materials were systematically characterized for their crystalline structures and photoelectrochemical properties, and evaluated for their of <i>E. coli</i> inactivation efficiency under visible light irradiation. The synthesized ZnO exhibited a hexagonal zincite phase, whereas ZnCo<sub>2</sub>O<sub>4</sub> was confirmed to be a spinel phase. The enhanced light absorption and charge carrier transfer efficiency of ZnCo<sub>2</sub>O<sub>4</sub>-ZnO contributed to superior photocatalytic activity. The influence of the mass ratio of ZnCo<sub>2</sub>O<sub>4</sub>-ZnO on the antimicrobial performance was thoroughly investigated. At an optimal mass ratio of ZnCo<sub>2</sub>O<sub>4</sub>:ZnO=1:20, a maximum <i>E. coli</i> inhibition efficiency of 92.64% was achieved. Moreover, the photocatalytic degradation efficiency of cefalexin (CEX) using 10 mg of 5%ZnCo<sub>2</sub>O<sub>4</sub>-ZnO reached 61.13%, representing a 43.97% improvement over the 17.16% degradation achieved with pristine ZnO. These findings demonstrated that the ZnCo<sub>2</sub>O<sub>4</sub>-ZnO composite exhibits markedly enhanced photocatalytic and antimicrobial activity compared to ZnO.</p>

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ZnCo2O4-ZnO S-Scheme Heterojunction for Photocatalytic Degradation of Cefalexin and Antimicrobial Properties

  • 期刊论文

  • 发表日期：

    2025年7月5日

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  • Junyu Lu,
  • Yunshu Lu,
  • Pitcheri Rosaiah,
  • Shu Lin,
  • Zada Amir,
  • Kezhen Qi

摘要

To identify an efficient photocatalyst for the removal of Escherichia coli (E. coli) contamination, ZnO was sythesized via a hydrothermal method. A series of nanocomposites with varying mass ratios (ZnCo2O4-ZnO) was fabricated by anchoring ZnCo2O4 onto ZnO using an in-situ growth technique, with the objective of enhancing ZnO’s photocatalytic performance. The resulting S-scheme heterojunction ZnCo2O4-ZnO materials were systematically characterized for their crystalline structures and photoelectrochemical properties, and evaluated for their of E. coli inactivation efficiency under visible light irradiation. The synthesized ZnO exhibited a hexagonal zincite phase, whereas ZnCo2O4 was confirmed to be a spinel phase. The enhanced light absorption and charge carrier transfer efficiency of ZnCo2O4-ZnO contributed to superior photocatalytic activity. The influence of the mass ratio of ZnCo2O4-ZnO on the antimicrobial performance was thoroughly investigated. At an optimal mass ratio of ZnCo2O4:ZnO=1:20, a maximum E. coli inhibition efficiency of 92.64% was achieved. Moreover, the photocatalytic degradation efficiency of cefalexin (CEX) using 10 mg of 5%ZnCo2O4-ZnO reached 61.13%, representing a 43.97% improvement over the 17.16% degradation achieved with pristine ZnO. These findings demonstrated that the ZnCo2O4-ZnO composite exhibits markedly enhanced photocatalytic and antimicrobial activity compared to ZnO.