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Adsorption and photocatalytic study of dyes for waste-water treatment using Mn modified DyCrO3 nanomaterials

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Abstract

In the present work, DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3 nanoparticles have been prepared via the sol-gel route and characterized by X-ray diffraction and UV-Visible Diffuse reflectance spectroscopy, SEM, EDX, and Photoluminescence spectroscopy. The influence of Mn substitution on the structural, optical, and photocatalytic properties of DyCrO3 has been studied. The XRD patterns confirm the orthorhombic phase of compounds with Pbnm space group. Furthermore, crystallite size of the nanoparticles is found to be 79.36 nm and 83.33 nm for DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3, respectively. The optical bandgap energy of DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3 compounds is 2.68 eV and 2.34 eV, respectively. The Photoluminescence spectrum exhibits blue, yellow and red emissions at 380 nm excitation wavelength. The dye degradation efficiency of DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3 compounds was tested on MB and RhB dyes under solar light irradiation for 180 min. The highest degradation efficiencies for DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3 compounds are 84% and 92% for RhB dye and 63% and 77% for MB dye in the presence of solar irradiation. The photodegradation kinetics obeys the first order linear kinetics and adsorption data follows pseudo second order model. Further, adsorption isotherms process follows the Langmuir and Freundlich model in the dark.

Graphical Abstract

Absorbance spectra of RhB dye using DCMO20 and DCMO50 photocatalysts under solar light irradiation

Highlights

  • DyCr0.8Mn0.2O3 and DyCr0.5Mn0.5O3 nanoparticles synthesized by sol-gel method.

  • Optical bandgap values of DCMO20 and DCMO50 compounds are 2.68 eV and 2.34 eV, respectively.

  • Highest degradation efficiencies for DCMO20 and DCMO50 compounds are 84% and 92% for RhB dye.

  • Adsorption isotherm process of compounds follows Langmuir and Freundlich model in dark.

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Acknowledgements

Dr Neeraj Panwar would like to thank DST SERB, India, for the use of facilities sanctioned in the Project ECR/2017/002681. Ms Manjeet Rani is thankful to DST New Delhi India for the INSPIRE fellowship (IF No. 190213). The XRD facility under CIF CURaj is also acknowledged. The authors also gratefully acknowledge Dr Anil Ohlan (Department of Physics, MDU Rohtak) and Dr Ritu Singh (Department of Environmental Science, CURaj) for providing the facility for optical and absorbance measurements to execute the photocatalytic analysis.

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  1. Department of Physics, Central University of Rajasthan Bandarsindri, Ajmer, 305817, Rajasthan, India

    Manjeet Rani, Kuldeep Singh & Neeraj Panwar

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MR: conceptualization, methodology, investigation, preparation of samples, Formal Analysis, writing original draft. KS: Formal Analysis, investigation. NP: conceptualization, methodology, investigation, validation, reviewing and editing.

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Rani, M., Singh, K. & Panwar, N. Adsorption and photocatalytic study of dyes for waste-water treatment using Mn modified DyCrO3 nanomaterials. J Sol-Gel Sci Technol 109, 483–501 (2024). https://doi.org/10.1007/s10971-023-06249-w

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