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<p>This study investigates the synthesis of cadmium oxide (CdO) nanoparticles and their composites with tin oxide (SnO<sub>2</sub>) through an alkaline precipitation method. Both CdO and CdO-SnO<sub>2</sub> nanocomposites were analyzed using powder X-ray diffraction, confirming their cubic crystal structure with a space group of Fm<sub>3</sub>m and lattice parameters a = b = c = 4.6958 Å. Scanning electron microscopy revealed spherical nanoparticles. Fourier transform infrared spectroscopy indicated the presence of characteristic functional groups, with pure CdO showing a peak at 835&#xa0;cm<sup>−1</sup> and CdO-SnO<sub>2</sub> nanocomposites showing peaks at 523&#xa0;cm<sup>−1</sup> and a weaker one at 726&#xa0;cm<sup>−1</sup>, suggesting variations in their chemical structures. Optical property analysis demonstrated that CdO-SnO<sub>2</sub> nanocomposites have a higher bandgap energy of 2.87&#xa0;eV compared to 2.56&#xa0;eV for pure CdO, indicating better charge separation capabilities. Electrochemical assessments using cyclic voltammetry revealed distinct behaviors with the composites exhibiting a resistance to electron transfer significantly higher than that of CdO. Photocatalytic degradation experiments under UV light showed that CdO-SnO<sub>2</sub> nanocomposites effectively degraded methyl orange (MO)by approximately 92.5% after 160&#xa0;min, significantly higher than under dark conditions where no degradation occurred without a photocatalyst. These findings highlight the potential of CdO-SnO<sub>2</sub> nanocomposites as effective photocatalysts for environmental purification applications.</p>

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Enhanced Photocatalytic and Electrochemical Properties of CdO–SnO2 Nanocomposites Synthesized via Alkaline Precipitation

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • N. Rajkamal,
  • K. Sambathkumar,
  • Nimra Nadeem,
  • Haya Abdullah Al-Dosari,
  • Sajid Ali Ansari,
  • Mir Waqas Alam

摘要

This study investigates the synthesis of cadmium oxide (CdO) nanoparticles and their composites with tin oxide (SnO2) through an alkaline precipitation method. Both CdO and CdO-SnO2 nanocomposites were analyzed using powder X-ray diffraction, confirming their cubic crystal structure with a space group of Fm3m and lattice parameters a = b = c = 4.6958 Å. Scanning electron microscopy revealed spherical nanoparticles. Fourier transform infrared spectroscopy indicated the presence of characteristic functional groups, with pure CdO showing a peak at 835 cm−1 and CdO-SnO2 nanocomposites showing peaks at 523 cm−1 and a weaker one at 726 cm−1, suggesting variations in their chemical structures. Optical property analysis demonstrated that CdO-SnO2 nanocomposites have a higher bandgap energy of 2.87 eV compared to 2.56 eV for pure CdO, indicating better charge separation capabilities. Electrochemical assessments using cyclic voltammetry revealed distinct behaviors with the composites exhibiting a resistance to electron transfer significantly higher than that of CdO. Photocatalytic degradation experiments under UV light showed that CdO-SnO2 nanocomposites effectively degraded methyl orange (MO)by approximately 92.5% after 160 min, significantly higher than under dark conditions where no degradation occurred without a photocatalyst. These findings highlight the potential of CdO-SnO2 nanocomposites as effective photocatalysts for environmental purification applications.