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Development of a Regenerable Fe-Ag/CNF Catalyst for the Oxidation of Organics-Laden Wastewater

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Abstract

The present study introduces an activated carbon bead-supported regenerable bimetal (Fe-Ag) catalyst for the catalytic wet air oxidation (cWAO) of organics in an industrial wastewater (chemical oxygen demand/COD ~ 120000 mg/L). The catalytic oxidation reaction is performed at 27 bar and 230 °C in a trickle bed reactor. The Fe-Ag nanoparticles-modified carbon nanofibers enhance the exposure of the bimetals to the aqueous organics during oxidation. The spent cWAO catalyst is regenerated through simple solvent-washing and H2-reduction steps. The SEM, XRD, Raman, and XPS spectroscopic results indicate that the physicochemical properties of the fresh catalyst, including the materials specific surface area are retained in the regenerated catalyst. The regenerated catalyst shows approximately the same efficiency (~ 99% COD reduction) as that of the fresh catalyst in three consecutive oxidation-regeneration cycles. The bimetal catalyst developed in this study for the treatment of aqueous organics is cost-effective and scalable.

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Acknowledgements

The authors acknowledge the Shell Technology Centre Bangalore, India for the research grant (Shell/ChE/2018124) and providing the industrial wastewater samples. The authors also acknowledge the Center for Environmental Science and Engineering, IIT Kanpur for carrying out the research.

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Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Haider Ali, Rahul Gupta & Nishith Verma

  2. Shell Technology Centre Bangalore, Bengaluru, 562149, India

    Kaushik Basak

  3. Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India

    Nishith Verma

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  1. Haider Ali
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  2. Rahul Gupta
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Correspondence to Nishith Verma.

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Ali, H., Gupta, R., Basak, K. et al. Development of a Regenerable Fe-Ag/CNF Catalyst for the Oxidation of Organics-Laden Wastewater. Catal Lett (2024). https://doi.org/10.1007/s10562-024-04711-0

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