Effect of calcination temperature on the structural, optical, and magnetic properties of synthesized α-LiFeO2 nanoparticles through solution-combustion

elfadeel, G. Abd; Manoharan, C.; Saddeek, Yasser B.; Venkateshwarlu, M.; Venkatachalapathy, R.

doi:10.1016/j.jallcom.2023.169097

Cited by 4 publications

(1 citation statement)

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“…The spectra exhibited representative Raman modes, the characteristic peaks of the magnetite nanoparticles present in both Fe 3 O 4 @AVS-BC and Fe 3 O 4 @MMT, including the peak at 1072 cm −1 , which corresponds to the stretching vibration of Fe-O bonds, and the one at 685 cm −1 related to the bending vibration of Fe-O bonds, further signifying the presence of magnetite. The obtained data agrees with the reported data for the as-prepared Fe 3 O 4 nanoparticles (Abd elfadeel et al 2023, Xie et al 2020. Alternatively, the Raman spectra for AVS-BC showed the presence of two strong bands at 1592 cm −1 , which corresponds to a D-band (related to the presence of sp 3 C-C atoms), and the second band (G-band) at 1350 cm −1 , which is called a graphitic band, related to the E 2g phonon of sp 2 carbon (C-C) atoms, which are characteristic peaks of carbonaceous materials (Chen et al 2023, Wang et al 2015, Xu et al 2015, Zhang et al 2023b.…”

Section: Tga Raman and Xrd Analysessupporting

confidence: 91%

Turning waste avocado stones and montmorillonite into magnetite-supported nanocomposites for the depollution of methylene blue: adsorbent reusability and performance optimization

El-Shafie,

Karamshahi,

El-Azazy

2023

Environ Sci Pollut Res

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The existence of methylene blue (MB) in wastewater even as traces is raising environmental concerns. In this regard, the performances of four adsorbents, avocado stone biochar (AVS-BC), montmorillonite (MMT), and their magnetite Fe3O4–derived counterparts, were compared. Results showed the superior performance of Fe3O4@AVS-BC and Fe3O4@MMT nanocomposites with removal percentages (%R) of 95.59% and 88%. The morphological features of AVS-BC as revealed by SEM analysis showed a highly porous surface compared to a plane and smooth surface in the case of MMT. Surface analysis using FT-IR and Raman spectroscopies corroborated the existence of the Fe–O peaks upon loading with magnetite. The XRD analysis confirmed the formation of cubic magnetite nanoparticles. The adsorption process in the batch mode was optimized using central composite design (CCD). Equilibrium and kinetic isotherms showed that the adsorption of MB onto Fe3O4@AVS-BC fitted well with the Langmuir isotherm and the pseudo-second-order (PSO) model. The maximum adsorption capacity (qm) was 118.9 mg/g (Fe3O4@AVS-BC) and 72.39 mg/g (Fe3O4@MMT). The Fe3O4@AVS-BC showed a higher selectivity toward MB compared to other organic contaminants. The MB-laden adsorbent was successfully used for the remediation of Cr (III), Ni (II), and Cd (II) with removal efficiencies hitting 100% following thermal activation.

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