Abstract
In this work, novel CeO2/CoWO4 heterostructured nanocomposites (NCs) were synthesized via a hydrothermal method. X-ray diffraction, high-resolution transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy were carried out to determine the crystal structure, deep morphology, optical properties, and charge separation of the obtained photocatalysts (PCs), respectively. In comparison to the pristine CoWO4, the CeO2 and CeO2/CoWO4 PCs demonstrated enhanced activity of methylene blue (MB) aqueous dye photodegradation under visible-light exposure. The photodegradation efficiency of the as-prepared CeO2/CoWO4 photocatalyst showed the premier decomposition ratio (92.5%) of MB dye in 105 min among all samples, which was notably 1.8-fold and 2.2-fold that of the pristine CeO2 (43%) and CoWO4 (60%), respectively. Likewise, the CeO2/CoWO4 PCs retained satisfactory photo-reactivity even after five sequential recycling runs, indicating their excellent photocatalytic stability and robustness. Hence the succeeding superior PCs preferred further efficient charge (e−–h+) separation, excellent visible-light absorption, and worthy interfacial energy transfer leads between CoWO4 and CeO2 nanoparticles. Additionally, a plausible mechanism for the photodegradation was proposed. The synergistic antibacterial properties of the CeO2/CoWO4 NCs were investigated by a gel diffusion method. Therefore, this work offers a novel avenue for the preparation of stable and efficient visible-light-driven PCs for environmental remediation.
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The authors thank the Department of Physics & Nanotechnology, SRM Institute of Science and Technology, Kanchipuram, Tamil Nadu, India for TEM measurement.
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Selvi, S., Rajendran, R., Barathi, D. et al. Facile Synthesis of CeO2/CoWO4 Hybrid Nanocomposites for High Photocatalytic Performance and Investigation of Antimicrobial Activity. J. Electron. Mater. 50, 2890–2902 (2021). https://doi.org/10.1007/s11664-020-08729-z
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DOI: https://doi.org/10.1007/s11664-020-08729-z