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<p>Heterojunctions formed with metal oxides facilitate efficient charge separation and transfer, enhancing the photocatalysis performance. In this work, the heterojunction ZnCr<sub>2</sub>O<sub>4</sub>/ V<sub>2</sub>O<sub>5</sub> (VZ) nanocomposite was synthesized using different weight percentages of V<sub>2</sub>O<sub>5</sub> (5%, 10% and 15%) via hydrothermal and ultrasonication methods. XRD, FTIR, XPS, HRSEM, PL, EIS, and BET analyses systematically study the interfacial properties of the heterostructure. HRTEM observed ZCO nanoparticles interfacing on the surface of the VO nanoflakes. BET analysis determined its increased surface area as the threefold order for the 10VZ sample. Mott-Schottky plot confirms n-type semiconductor with flat-band potential of 0.023&#xa0;V for ZCO and 0.170&#xa0;V for VO. The reduced charge carrier recombination in the 10VZ sample was confirmed by PL spectroscopy. Photoelectrochemical studies analyzed the improved charge transfer characteristics. Scavenger analyses confirmed the significant involvement of hydroxyl radicals <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({}^{.}\text{OH}\)</EquationSource> </InlineEquation> and photogenerated holes (h⁺) as reactive species. Under optimized conditions ([MB/Cip]<sub>0</sub> = 10&#xa0;mg/L, catalyst dosage = 0.5&#xa0;g/L, 75&#xa0;min reaction), the 10VZ sample achieved 97% MB and 68% Cip degradation with the rate constant of 0.032&#xa0;min<sup>−1</sup> (MB) and 0.06&#xa0;min<sup>−1</sup> (Cip). These engineered nanostructures demonstrated remarkable photocatalytic efficiency in the visible spectrum. Further, the charge carriers transport properties of n–n heterojunction are approached through the S scheme to remove pollutant molecules effectively. These findings highlight the substantial potential of ZnCr<sub>2</sub>O<sub>4</sub>-based materials for effective environmental remediation. Further, an antibacterial test was performed against <i>Pseudomonas aeruginosa. Bacillus, Staphylococcus aureus,</i> and <i>E. Coli</i> strains.</p>

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Tailored ZnCr2O4/V2O5 n–n heterojunction for high-efficiency photocatalytic degradation of MB and CIP under visible light irradiation

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • K. Bharathi,
  • M. Sudha,
  • G. Bakiyaraj,
  • J. Archana,
  • M. Navaneethan

摘要

Heterojunctions formed with metal oxides facilitate efficient charge separation and transfer, enhancing the photocatalysis performance. In this work, the heterojunction ZnCr2O4/ V2O5 (VZ) nanocomposite was synthesized using different weight percentages of V2O5 (5%, 10% and 15%) via hydrothermal and ultrasonication methods. XRD, FTIR, XPS, HRSEM, PL, EIS, and BET analyses systematically study the interfacial properties of the heterostructure. HRTEM observed ZCO nanoparticles interfacing on the surface of the VO nanoflakes. BET analysis determined its increased surface area as the threefold order for the 10VZ sample. Mott-Schottky plot confirms n-type semiconductor with flat-band potential of 0.023 V for ZCO and 0.170 V for VO. The reduced charge carrier recombination in the 10VZ sample was confirmed by PL spectroscopy. Photoelectrochemical studies analyzed the improved charge transfer characteristics. Scavenger analyses confirmed the significant involvement of hydroxyl radicals \({}^{.}\text{OH}\) and photogenerated holes (h⁺) as reactive species. Under optimized conditions ([MB/Cip]0 = 10 mg/L, catalyst dosage = 0.5 g/L, 75 min reaction), the 10VZ sample achieved 97% MB and 68% Cip degradation with the rate constant of 0.032 min−1 (MB) and 0.06 min−1 (Cip). These engineered nanostructures demonstrated remarkable photocatalytic efficiency in the visible spectrum. Further, the charge carriers transport properties of n–n heterojunction are approached through the S scheme to remove pollutant molecules effectively. These findings highlight the substantial potential of ZnCr2O4-based materials for effective environmental remediation. Further, an antibacterial test was performed against Pseudomonas aeruginosa. Bacillus, Staphylococcus aureus, and E. Coli strains.