Abstract
Nickel-doped cobalt ferrite nanoparticles based on Andrographis paniculata plant extract were prepared through the microwave-assisted method. The obtained nanoparticles were analyzed using XRD, FTIR, UV-DRS, SEM with EDAX, and HRTEM with SAED. XRD exhibits a cubic lattice structure of ferrites and the lattice parameter decreases with an increase in nickel dopant. The vibrational stretching mode of the metal–oxygen bond is observed for tetrahedral and octahedral sites. The optical energy bandgap of pure CoFe2O4 nanoparticles gradually increases with nickel doping. The luminescence spectrum showed the violet, yellow, green, and orange emissions of synthesized nanoparticles. Further, photodegradation of prepared nanoparticles was assessed for the degradation of Methylene blue, Rhodamine B, Eriochrome black T, Rose bengal, and Evan’s blue dyes. Antibacterial activity of synthesized nanoparticles was tested against Gram-positive and Gram-negative bacterial strains. The antibacterial activity improved with Ni doping when compared with pure CoFe2O4 nanoparticles.

Highlights
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Nickel-doped cobalt ferrite nanoparticles were prepared by microwave-assisted bioengineered method using Andrographis paniculata plant extract.
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Ni-doped cobalt ferrite nanoparticles were characterized by structural, morphological, and optical studies.
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Ni-doped cobalt ferrite nanoparticles showed promising photocatalytic activity against Methylene blue, Rhodamine B, Rose bengal, Eriochrome black T, and Evan’s blue under visible light irradiation.
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Antibacterial activity (food-borne pathogens) of pure cobalt ferrite and Ni-doped cobalt ferrite nanoparticles is evaluated.
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Acknowledgements
One of the authors, M. Madhukara Naik expresses his gratitude to the University Grants Commission (UGC), New Delhi for providing RGNF (SRF-RGNF-2015-17-SC-KAR-8007) and Kuvempu University. One of the authors, Dr. G. Nagaraju thanks DST-SERB (SB/FT/CS-083/2012) Government of India, New Delhi for providing characterization techniques and the principal, Siddaganga Institute of Technology. One of the authors, Dr. M. Vinuth thanks the principal and Board of Management, NIE-IT for encouraging the research activity.
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Naik, M.M., Naik, H.S.B., Kottam, N. et al. Multifunctional properties of microwave-assisted bioengineered nickel doped cobalt ferrite nanoparticles. J Sol-Gel Sci Technol 91, 578–595 (2019). https://doi.org/10.1007/s10971-019-05048-6
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DOI: https://doi.org/10.1007/s10971-019-05048-6