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<p>Zn<sub><i>x</i></sub>Co<sub>1−<i>x</i></sub>S (0 ≤ <i>x</i> ≤ 1) nanoparticles were prepared by the hydrothermal method. The nanoparticles were characterized using XRD, EDX, FE-SEM, UV-Vis/DRS, VSM, and BET surface area analysis. A compositional phase evolution was observed, transitioning from pure cubic CoS (<i>x</i> = 0) through a mixed CoS/ZnS phase (<i>x</i> = 0.2), to pure cubic ZnS (<i>x</i> ≥ 0.4). The morphology evolved from spherical nanoparticles to stacked layered structures with changing composition. Zn<sub><i>x</i></sub>Co<sub>1−<i>x</i></sub>S shows soft ferromagnetic behavior, and the composition <i>x</i> = 0.6 exhibited a maximum coercivity of 44 G and a saturation magnetization of 1.69 emu/g. A high surface area of 133.2 m<sup>2</sup>/g was detected for pure CoS and systematically decreased with Zn content. The optical band gap has a minimum value of 3.31&#xa0;eV for <i>x</i> = 1 and a maximum value of 3.65&#xa0;eV for <i>x</i> = 0.5. The composition <i>x</i> = 0.4 demonstrated exceptional photocatalytic activity, ⁓99.47%, towards Congo red within 75&#xa0;min, while <i>x</i> = 0.5 showed maximum adsorption capacity (34.36&#xa0;mg/g) correlated with the minimal crystallite size and high surface area of ZnS phase. Zn<sub><i>x</i></sub>Co<sub>1−<i>x</i></sub>S exhibits a tunable platform where composition directly controls structural, magnetic, optical, and catalytic properties, with <i>x</i> = 0.4–0.6 emerging as the optimal multifunctional composition for environmental remediation applications.</p>

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Synergistic Effects in ZnxCo1−xS (0 ≤ x ≤ 1): Interplay Between Composition, Magnetic Order, and Catalytic Activity

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Dalia Ali,
  • Abdelazim M. Mebed,
  • Meshal Alzaid,
  • Alaa M. Abd-Elnaiem,
  • Abdullah Almohammedi,
  • R. F. Abdelbaki

摘要

ZnxCo1−xS (0 ≤ x ≤ 1) nanoparticles were prepared by the hydrothermal method. The nanoparticles were characterized using XRD, EDX, FE-SEM, UV-Vis/DRS, VSM, and BET surface area analysis. A compositional phase evolution was observed, transitioning from pure cubic CoS (x = 0) through a mixed CoS/ZnS phase (x = 0.2), to pure cubic ZnS (x ≥ 0.4). The morphology evolved from spherical nanoparticles to stacked layered structures with changing composition. ZnxCo1−xS shows soft ferromagnetic behavior, and the composition x = 0.6 exhibited a maximum coercivity of 44 G and a saturation magnetization of 1.69 emu/g. A high surface area of 133.2 m2/g was detected for pure CoS and systematically decreased with Zn content. The optical band gap has a minimum value of 3.31 eV for x = 1 and a maximum value of 3.65 eV for x = 0.5. The composition x = 0.4 demonstrated exceptional photocatalytic activity, ⁓99.47%, towards Congo red within 75 min, while x = 0.5 showed maximum adsorption capacity (34.36 mg/g) correlated with the minimal crystallite size and high surface area of ZnS phase. ZnxCo1−xS exhibits a tunable platform where composition directly controls structural, magnetic, optical, and catalytic properties, with x = 0.4–0.6 emerging as the optimal multifunctional composition for environmental remediation applications.