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Inducing the Catalytic Activity in SrFe12O19 Via Chemical Modification

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Abstract

In this study, we demonstrate that the catalytic activity could be induced in the hard magnetic strontium hexaferrite (SrFe12O19) system by replacing a small fraction of Fe by Cu. Nanocrystalline SrFe12O19 and SrCu0.3Fe11.7O19 samples were synthesized by a tartrate-gel method and their structural, microstructural, specific surface area and magnetic properties were studies. Subsequently, the nanocrystalline hexaferrite powders were employed as catalysts to drive 4-nitrophenol reduction reaction using the NaBH4 as the reducing agent. The progress of the catalytic reactions was evaluated using UV–visible spectrophotometer. The unsubstituted sample was found to be catalytically inactive whereas SrCu0.3Fe11.7O19 sample showed superior catalytic performance in transforming 4-nitrophenol to 4-aminophenol within 8 min. Reusability test confirmed that the SrCu0.3Fe11.7O19 catalyst retains its 100% activity even after five consecutive cycles. In addition, the effect of crystallite size of SrCu0.3Fe11.7O19 on the catalytic reduction reaction of 4-nitrophenol was investigated. The results indicated that the time taken to complete the reduction reaction has been increased as size of the crystallites increased, probably due to decrease in the large number of surface active sites of the catalyst.

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Acknowledgements

P.N. Anantharamaiah is indebted to Dr. P.A. Joy, CSIR-National Chemical Laboratory, Pune, for the VSM measurements. Sujoy Saha gratefully acknowledges Dr. D.S. Kothari Postdoctoral Fellowship, U.G.C. New Delhi

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Mathematical and Physical Sciences, M. S. Ramaiah University of Applied Sciences, Bangalore, 560058, India

    P. N. Anantharamaiah & Sanjukta Mondal

  2. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012, India

    Sujoy Saha

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  1. P. N. Anantharamaiah
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  2. Sanjukta Mondal
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  3. Sujoy Saha
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Correspondence to P. N. Anantharamaiah.

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Anantharamaiah, P.N., Mondal, S. & Saha, S. Inducing the Catalytic Activity in SrFe12O19 Via Chemical Modification. Catal Lett 151, 221–231 (2021). https://doi.org/10.1007/s10562-020-03292-y

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  • DOI: https://doi.org/10.1007/s10562-020-03292-y

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