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<p>Photocatalytic purification represents a cornerstone in next-generation clean energy and environmental technologies.The use of heterostructures improves photocatalytic activity. In this work, Zn<sub>0.92</sub> Co<sub>0.08</sub>O/ Mo<sub>0.92</sub> Mg<sub>0.08</sub>S<sub>2</sub> nanocomposite (CZ-MM) has been synthesized by hydrothermal method. The purpose of this research is to investigate the performance of this nanocomposite for the degradation of the dye methylene blue (MB). Unlike conventional ZnO/MoS₂ or Co–ZnO systems, this material exploits a synergistic dual-doping mechanism, where Co and Mg dopants modulate band structures and create interfacial charge-bridging states. Properties of samples were investigated using X-ray diffraction (XRD), Raman spectroscopy, FT-IR spectroscopy, scanning electron microscopy (SEM) and Field Emission Scanning Electron Microscopy (FESEM), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL) and Brunauer-Emmett-Teller method (BET). The photocatalytic performance of Zn<sub>0.92</sub> Co<sub>0.08</sub>O, Mo<sub>0.92</sub> Mg<sub>0.08</sub>S<sub>2</sub> and prepared nanocomposites were compared for the degradation of MB dye under visible light irradiation. The highest degradation rate of MB by CZ-MM nanocomposites was about 89% in 120&#xa0;min, which is significantly higher than the efficiency of Zn<sub>0.92</sub> Co<sub>0.08</sub>O (26%) and Mo<sub>0.92</sub> Mg<sub>0.08</sub>S<sub>2</sub> (44%). The improvement of photocatalytic performance in nanocomposite is attributed to the synergistic effect of Zn<sub>0.92</sub> Co<sub>0.08</sub>O and Mo<sub>0.92</sub> Mg<sub>0.08</sub>S<sub>2</sub>. The results of BET analysis showed that CZ-MM nanocomposite (12.52 m<sup>2</sup>/g) has a larger surface area than doped MoS<sub>2</sub> (8.49 m<sup>2</sup>/g). Based on the obtained results, the composite that contained more Mg-doped MoS<sub>2</sub> had better performance. From a visionary perspective, this approach could lay the foundation for self-regulating photocatalytic surfaces – materials that dynamically adapt their charge landscape, much like autonomous systems in advanced robotics or AI-driven energy platforms. In essence, this work not only optimises photocatalysis but also redefines our understanding of light–matter interactions at the nanoscale a concept that could have as profound an impact on next-generation clean-tech industries as reusable rockets have had on aerospace.</p> Graphical abstract <p></p>

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Enhancement of photocatalytic degradation of methylene blue in visible light by developing Co-ZnO/Mg-MoS2 nanocomposite

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Gelareh Nosrati,
  • Seyed Mohammad Mirkazemi

摘要

Photocatalytic purification represents a cornerstone in next-generation clean energy and environmental technologies.The use of heterostructures improves photocatalytic activity. In this work, Zn0.92 Co0.08O/ Mo0.92 Mg0.08S2 nanocomposite (CZ-MM) has been synthesized by hydrothermal method. The purpose of this research is to investigate the performance of this nanocomposite for the degradation of the dye methylene blue (MB). Unlike conventional ZnO/MoS₂ or Co–ZnO systems, this material exploits a synergistic dual-doping mechanism, where Co and Mg dopants modulate band structures and create interfacial charge-bridging states. Properties of samples were investigated using X-ray diffraction (XRD), Raman spectroscopy, FT-IR spectroscopy, scanning electron microscopy (SEM) and Field Emission Scanning Electron Microscopy (FESEM), UV-vis diffuse reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL) and Brunauer-Emmett-Teller method (BET). The photocatalytic performance of Zn0.92 Co0.08O, Mo0.92 Mg0.08S2 and prepared nanocomposites were compared for the degradation of MB dye under visible light irradiation. The highest degradation rate of MB by CZ-MM nanocomposites was about 89% in 120 min, which is significantly higher than the efficiency of Zn0.92 Co0.08O (26%) and Mo0.92 Mg0.08S2 (44%). The improvement of photocatalytic performance in nanocomposite is attributed to the synergistic effect of Zn0.92 Co0.08O and Mo0.92 Mg0.08S2. The results of BET analysis showed that CZ-MM nanocomposite (12.52 m2/g) has a larger surface area than doped MoS2 (8.49 m2/g). Based on the obtained results, the composite that contained more Mg-doped MoS2 had better performance. From a visionary perspective, this approach could lay the foundation for self-regulating photocatalytic surfaces – materials that dynamically adapt their charge landscape, much like autonomous systems in advanced robotics or AI-driven energy platforms. In essence, this work not only optimises photocatalysis but also redefines our understanding of light–matter interactions at the nanoscale a concept that could have as profound an impact on next-generation clean-tech industries as reusable rockets have had on aerospace.

Graphical abstract