Structural characterization of green synthesized magnetic mesoporous Fe3O4NPs@ME

Vinayagam, Ramesh and Zhou, Chenxi and Pai, Shraddha and Thivaharan, Varadavenkatesan and Narasimhan, Manoj Kumar and Selvaraju, Narayanaswamy and Raja, Selvaraj (2021) Structural characterization of green synthesized magnetic mesoporous Fe3O4NPs@ME. Materials Chemistry and Physics. pp. 1-11. ISSN 0254-0584

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Abstract

Mesoporous magnetite nanoparticles (Fe3O4NPs) were synthesized by using the leaf extract of Mussaenda erythrophylla (ME) by a cheap and simple method – green synthesis. The synthesized Fe3O4NPs@ME were characterized by various techniques. A strong absorption spectrum without any specific peak in the UV–vis image designated the formation of iron-containing nanoparticles. XRD image confirmed the presence of only magnetite and the purity was ascertained by the absence of other forms of iron-containing nanoparticles. The average crystallite size was calculated as 18.58 nm and the lattice parameter was 8.38 Å which was close to the magnetite standards. FE-SEM image portrayed spherical aggregates and EDS showed signature peaks for Fe and O elements. XPS image showed the presence of peaks for oxygen, ferrous, and ferric ions which are consistent with magnetite along with carbon on the surface. Mesoporous structure (5.78 nm) was affirmed by BET results which showed a higher surface area (174.15 m2 /g) than the commercial one. The FTIR bands obtained at 454.25 and 667.39 cm− 1 corresponded to the distinctive Fe–O linkage, substantiating the formation of magnetite. The stability of the magnetite at very high temperature was validated by TGA results which showed a 15% total reduction in weight. The magnetite showed superparamagnetism with a low saturation magnetization value (5.14 emu/g) which confirmed the existence of non-magnetic surface layers arising from the phytomolecules residing in the leaf extract of M. erythrophylla. Hence, the pure, crystalline, and mesoporous Fe3O4NPs@ME with large surface area

Item Type: Article
Uncontrolled Keywords: Mussaenda erythrophylla Magnetite nanoparticles Green synthesis TGA VSM BET
Subjects: Engineering > MIT Manipal > Biotechnology
Engineering > MIT Manipal > Chemical
Depositing User: MIT Library
Date Deposited: 29 Jun 2021 09:40
Last Modified: 29 Jun 2021 09:40
URI: http://eprints.manipal.edu/id/eprint/156851

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