Structural characterization of green synthesized α-Fe2O3 nanoparticles using the leaf extract of Spondias dulcis

Vinayagam, Ramesh and Pai, Shraddha and Thivaharan, Varadavenkatesan and Narasimhan, Manoj Kumar and Narayanasamy, P and Raja, Selvaraj (2020) Structural characterization of green synthesized α-Fe2O3 nanoparticles using the leaf extract of Spondias dulcis. Surfaces and Interfaces, 20. ISSN 2468-0230

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Microporous α-Fe2O3 nanoparticles were synthesized by employing the extract of Spondias dulcis leaves by greensynthesis technique for the first time. The nanoparticles were characterized by many techniques. A continual absorption band without any peak in UV-vis spectrum and a strong signal for iron and oxygen atoms in EDS confirmed the formation of iron-oxide nanoparticles. Rod-like structures with few aggregations due to magnetic interactions were witnessed in FE-SEM image. Specific peaks belonging to α-Fe2O3 nanoparticles were observed in XRD spectrum, and they were very pure and crystalline with a mean particle diameter of 11.38 nm. XPS analysis confirmed oxidation state of Fe and O and portrayed the presence of α-Fe2O3. A relatively higher surface area (190.84 m2 /g) than reported green-synthesized α-Fe2O3 nanoparticles has been obtained by BET analysis, and the pores were microscopic (0.465 nm) in nature. Signature bands for Fe-O (1136 cm−1 ) and organic moieties stretching vibrations were confirmed by FTIR spectrum. The point of zero charge was determined as 7.97 which is concordant with the published value for α-Fe2O3. The thermal stability was ascertained by TGA which showed 28% weight loss. The synthesized α-Fe2O3 were superparamagnetic with a very high saturation magnetization value of 34.46 emu/g. Besides, a probable mechanism for the synthesis of microporous α-Fe2O3 has been proposed. Therefore, the highly pure, crystalline, and microporous α-Fe2O3 with high surface area, synthesized by this green synthesis method could play a significant role in various fields.

Item Type: Article
Uncontrolled Keywords: Spondias dulcis α-Fe2O3 Green synthesis TGA VSM BET
Subjects: Engineering > MIT Manipal > Biotechnology
Engineering > MIT Manipal > Chemical
Depositing User: MIT Library
Date Deposited: 30 Oct 2020 05:41
Last Modified: 30 Oct 2020 05:41

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