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<p>Molybdenum oxide (MoO<sub>3</sub>) is limited in photocatalytic applications due to its low quantum efficiency, wide band gap, and rapid electron-hole recombination. To overcome these drawbacks, cadmium sulfide (CdS)-decorated MoO<sub>3</sub> nanostructures (MCdS-NS) were synthesized at 90 °C using a sol–gel method and subsequently thermally treated at 150 °C for 2 h (H/MCdS-NS). The heat treatment transformed the CdS-decorated rod-like morphology into uniformly distributed nanoparticles, resulting in crack-free structures with an average crystallite size of ~27 nm, a specific surface area of 38 m<sup>2</sup>/g, and thermal stability up to ~640 °C. The H/MCdS-NS exhibited a band gap of ~4.56 eV and uniform elemental distribution of Mo, Cd, and S. Photocatalytic evaluation revealed that H/MCdS-NS achieved ~95% degradation of methylene blue (MB) within 210 min under UV irradiation with a rate constant of 0.01 min<sup>−1</sup>. These results demonstrated that CdS decoration effectively enhances the photocatalytic activity of MoO<sub>3</sub>, positioning H/MCdS-NS as a promising material for efficient water purification.</p><p></p>

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Enhanced photocatalytic activity of CdS decorated MoO3 from nanorods to nanoparticles for the MB degradation

  • 期刊论文

  • 发表日期：

    2025年10月15日

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  • Shumaila Islam,
  • Adil Alshoaibi,
  • Kawther Alamer

摘要

Molybdenum oxide (MoO3) is limited in photocatalytic applications due to its low quantum efficiency, wide band gap, and rapid electron-hole recombination. To overcome these drawbacks, cadmium sulfide (CdS)-decorated MoO3 nanostructures (MCdS-NS) were synthesized at 90 °C using a sol–gel method and subsequently thermally treated at 150 °C for 2 h (H/MCdS-NS). The heat treatment transformed the CdS-decorated rod-like morphology into uniformly distributed nanoparticles, resulting in crack-free structures with an average crystallite size of ~27 nm, a specific surface area of 38 m2/g, and thermal stability up to ~640 °C. The H/MCdS-NS exhibited a band gap of ~4.56 eV and uniform elemental distribution of Mo, Cd, and S. Photocatalytic evaluation revealed that H/MCdS-NS achieved ~95% degradation of methylene blue (MB) within 210 min under UV irradiation with a rate constant of 0.01 min−1. These results demonstrated that CdS decoration effectively enhances the photocatalytic activity of MoO3, positioning H/MCdS-NS as a promising material for efficient water purification.