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Structural optical and magnetic characterizations of pure and cobalt-doped CdSe nanoparticles to investigate photocatalytic degradation of methyl blue under visible light

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Abstract

The samples of cadmium selenide (CdSe) nanoparticles (NPs) of pure and doped with cobalt (Co) were developed in a chemical reduction route. The synthesized nanoparticles were characterized employing transmission electron microscopy (TEM), selected area electron diffraction pattern (SAED), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), energy dispersive x-ray analysis (EDX), x-ray diffractometry (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, vibrating sample magnetometer (VSM) tool, UV–Vis spectroscopy, photoluminescence (PL) spectroscopy and photocatalytic activity measurements. The average crystallite size is 5.8–8 nm as determined by TEM and XRD measurements. With increased cobalt percentage in CdSe as a doping element, strong photoluminescence quenching and improved quantum confinement are observed. The direct bandgap of CdSe nanoparticle samples of pure and doped with Co (5% & 7%), measured by UV–vis spectrometer are 2.02 eV, 2.13 eV and 2.23 eV, respectively. Photocatalytic activities of CdSe were studied by irradiating the solution of methyl blue (MB) upon its exposure to visible light. The pure CdSe, 5% Co-doped CdSe and 7% Co-doped CdSe show removal efficiency for Methyl Blue solution at pH 7 as 75%, 85% and 97% in 60 min, respectively. In particular, the 7% Co-doped CdSe photocatalyst exhibits about 97% degradation of MB dye at a rate constant (0.0076 min−1) which is clearly more efficient than 5% Co-doped CdSe (0.0067 min−1) and pure CdSe (0.0037 min−1).

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Acknowledgements

Authors acknowledge the IIT Kharagpur Central Research Facilities laboratory and UGC & DST for the SAP & FIST programme in the department of Physics, Vidyasagar University. The authors also acknowledge the Department of Electronics Vidyasagar University & the Department of Electronics Midnapore College (Autonomous).

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  1. Department of Electronics, Vidyasagar University, Midnapore, 721 102, West Bengal, India

    Amit Manna, Mihir Ranjan Bera & Subhas Chandra Saha

  2. Department of Physics, Raja N.L. Khan Women’s College (Autonomous), Midnapore, 721102, West Bengal, India

    Mihir Ranjan Bera

  3. Department of Electronics, Midnapore College (Autonomous), Midnapore, 721101, West Bengal, India

    Tilak Narayan Ghosh

  4. Department of Physics, Vidyasagar University, Midnapore, 721102, West Bengal, India

    Amit Manna & Satyajit Saha

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AM, SS and TNG assisted with the problem of the research, carried out the measurement, and manuscript writing. SCS & MRB assisted with the measurement, discussed and helped in drafting the manuscript. All authors read and approved the final manuscript.

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Manna, A., Bera, M.R., Ghosh, T.N. et al. Structural optical and magnetic characterizations of pure and cobalt-doped CdSe nanoparticles to investigate photocatalytic degradation of methyl blue under visible light. J Mater Sci: Mater Electron 35, 170 (2024). https://doi.org/10.1007/s10854-024-11955-4

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