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Photocatalytic activity of cation (Mn) and anion (N) substitution in LaCoO3 nanoperovskite under visible light

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Abstract

LaCoO3 compound and novel photocatalysts of LaCo0.8Mn0.2O3 and N-doped LaCoO3 were synthesized by sol-gel method. The structure, morphology, size of particles and optical properties of the obtained powders were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and ultraviolet–visible (UV–Vis) (DRS mode) spectroscopy. The perovskite structure obtained for all the prepared samples and doping Mn and N do not change the perovskite structure. SEM results revealed that the size of particles of all perovskites was less than 100 nm. Compared to that of parent LaCoO3, the band gap energy of LaCo0.8Mn0.2O3 and N-doped LaCoO3 considerably reduced due to the formation of impurity level. The photocatalytic activity of all samples was evaluated by the degradation of malachite green as a model dye under visible light irradiation. The discoloration induced by LaCo0.8Mn0.2O3 was twice that induced by pure LaCoO3 because of Mn ions with variable valance and smaller band gap energy. The nitrogen incorporation also significantly improved the photocatalytic activity of LaCoO3 due to more oxygen vacancies and the stronger absorption in visible region. In general, doping has been served as one of the most efficient methods for the improvement in band gap of photocatalysts.

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Acknowledgements

The authors would like to acknowledge the financial support from University of Zanjan and Iranian Nanotechnology Initiative.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, University of Zanjan, Zanjan, 4537138791, Iran

    Parvaneh Nakhostin Panahi, Mohammad Hossein Rasoulifard & Sara Babaei

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  1. Parvaneh Nakhostin Panahi
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  2. Mohammad Hossein Rasoulifard
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  3. Sara Babaei
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Correspondence to Parvaneh Nakhostin Panahi.

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Nakhostin Panahi, P., Rasoulifard, M.H. & Babaei, S. Photocatalytic activity of cation (Mn) and anion (N) substitution in LaCoO3 nanoperovskite under visible light. Rare Met. 39, 139–146 (2020). https://doi.org/10.1007/s12598-019-01329-9

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  • DOI: https://doi.org/10.1007/s12598-019-01329-9

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