Visible light irradiated photocatalytic activity of copper substituted CoMn2O4 nanoparticles

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Islamia University of Bahawalpur

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Chemistry Department

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Research Article

Publication Title

Desalination and Water Treatment

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In the current investigation, copper substituted cobalt manganese spinel oxide (Cux Co1–x Mn2 O4) photocatalyst was prepared via the co-precipitation method. The synthesized nanoparticles were characterized by X-ray diffraction, field emission scanning electron microscopy, and Fourier-transform infrared spectroscopy. The prepared Cu0.2 Co1–0.2 Mn2 O4 nanoparticle exhibited excellent photocatalytic activity for degradation of typical organic-based dye Methylene blue (MB). Furthermore, the comparative study of pure CoMn2 O4 and Cu-substituted CoMn2 O4 nanoparticles (NPs) towards the photocatalytic performance was also conducted. As compared to the CoMn2 O4 nanoparticles, the Cux Co1–x Mn2 O4 nanoparticles exhibited excellent photocatalytic capability for the degradation of MB dye. After 80 min of visible light irradiation, the decomposition of MB by Cux Co1–x Mn2 O4 nanoparticles was higher as compared to degradation MB dye in the presence of copper substituted CoMn2 O4 NPs. Copper substituted cobalt manganese oxide nano-photocatalyst was also used for comparative study. The Cu0.2 Co(1–0.2) Mn2 O4 showed excellent (~86%) photocatalytic performance in contrast with Cu0 CoMn(1–0) O4 (22%), Cu0.5 Co(1–0.5) Mn2 O4 (57), Cu0.1 Co(1–0.1) Mn2 O4 (60%), Cu0.15 Co(1–0.15) Mn2 O4 (73%) for the degradation of MB in visible light irradiation. The enhanced photocatalytic activity is mainly attributed to the optimized bandgap, which might have developed by the inclusion of copper ions into the CoMn2 O4 spinel oxide. The copper substitution not only contributed to the inhibition of photo-induced electron–hole pairs but also assisted a great redox capability. Cux Co1–x Mn2 O4 photocatalyst holds great potential for massive pollutant treatment due to the superb photocatalytic performance for organic pollutants.

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