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<p>Cobalt oxide nanoparticles are increasingly studied for their low cost and high stability. However, their limited photocatalytic performance, primarily due to faster electron–hole recombination, has prompted extensive research over the past decade. To overcome this challenge, we have synthesized Cu-doped Co<sub>3</sub>O<sub>4</sub> nanoparticles using a facile coprecipitation method at room temperature. The X-ray diffraction (XRD) analysis revealed a reduction in the crystalline size of Cobalt Oxide nanoparticles after doping. FESEM showed porous hexagonal nanosheets as the underlined structure of synthesized Cu-doped Co<sub>3</sub>O<sub>4</sub>. FTIR spectra confirmed the spinel structure and high purity of the nanosheets. Brunauer–Emmett–Teller (BET) analysis showed a considerable enhancement in the specific surface area following doping, increasing from 4.21 m<sup>2</sup>/gm for pristine Co<sub>3</sub>O<sub>4</sub> to 80.75 m<sup>2</sup>/gm for 7.5% Cu-doped Co<sub>3</sub>O<sub>4</sub>. UV–Vis spectra of doped nanosheets showed a red shift in the characteristic absorbance indicating a lowering of the optical band gap. The Tauc plot revealed the optical band gap of the 7.5% Cu-doped Co<sub>3</sub>O<sub>4</sub> to be 2.02&#xa0;eV in contrast to the 2.41&#xa0;eV of the pristine Co<sub>3</sub>O<sub>4</sub> nanosheets. Furthermore, UV and visible radiation-induced degradation of Crystal Violet dye was conducted in the presence of the synthesized nanosheets to evaluate their efficiency. Remarkably, the 7.5% Cu-doped Co<sub>3</sub>O<sub>4</sub> exhibited degradation of 92.79% and 97.02% under UV and visible radiation respectively in 20&#xa0;min. These findings emphasize the influence of the Cu-doping structural, optical and photocatalytic properties of Cobalt oxide nanoparticles under UV as well as visible radiation.</p>

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Enhanced photocatalytic degradation of crystal violet with hexagonal nanosheets of Cu-doped Co3O4 under UV and visible irradiation

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Akash D. Salmote,
  • Abhijeet R. Pawar,
  • Kahkashan R. Shaikh,
  • Prabhakar B. Undre

摘要

Cobalt oxide nanoparticles are increasingly studied for their low cost and high stability. However, their limited photocatalytic performance, primarily due to faster electron–hole recombination, has prompted extensive research over the past decade. To overcome this challenge, we have synthesized Cu-doped Co3O4 nanoparticles using a facile coprecipitation method at room temperature. The X-ray diffraction (XRD) analysis revealed a reduction in the crystalline size of Cobalt Oxide nanoparticles after doping. FESEM showed porous hexagonal nanosheets as the underlined structure of synthesized Cu-doped Co3O4. FTIR spectra confirmed the spinel structure and high purity of the nanosheets. Brunauer–Emmett–Teller (BET) analysis showed a considerable enhancement in the specific surface area following doping, increasing from 4.21 m2/gm for pristine Co3O4 to 80.75 m2/gm for 7.5% Cu-doped Co3O4. UV–Vis spectra of doped nanosheets showed a red shift in the characteristic absorbance indicating a lowering of the optical band gap. The Tauc plot revealed the optical band gap of the 7.5% Cu-doped Co3O4 to be 2.02 eV in contrast to the 2.41 eV of the pristine Co3O4 nanosheets. Furthermore, UV and visible radiation-induced degradation of Crystal Violet dye was conducted in the presence of the synthesized nanosheets to evaluate their efficiency. Remarkably, the 7.5% Cu-doped Co3O4 exhibited degradation of 92.79% and 97.02% under UV and visible radiation respectively in 20 min. These findings emphasize the influence of the Cu-doping structural, optical and photocatalytic properties of Cobalt oxide nanoparticles under UV as well as visible radiation.