A simple wet chemical route to synthesize ferromagnetic nickel ferrite nanoparticles in the presence of oleic acid as a surfactant

Nanoparticles (NPs) of multiferroic bismuth ferrite (BiFeO3) with narrow size distributions were synthesized via a wet chemical route using bismuth nitrate and iron nitrate as starting materials and excess tartaric acid and citric acid as chelating agent, respectively, followed by thermal treatment. It was found that BiFeO3NPs crystallized at∼350∘Cwhen using citric acid as chelating agent. Such crystallization temperature is much lower than that of conventional chemical process in which other types of chelating agent are used. BiFeO3NPs with different sizes distributions show obvious ferromagnetic properties, and the magnetization is increased with reducing the particle size.

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Structures of chemically stabilized ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100150459 ◽

1993 ◽

Vol 51 ◽

pp. 924-925

Author(s):

Pratibha L. Gai ◽

M. A. Saltzberg ◽

L.G. Hanna ◽

S.C. Winchester

Keyword(s):

High Temperature ◽

Calcium Nitrate ◽

Nitrate Hexahydrate ◽

Chemical Route ◽

Cubic Form ◽

Tetragonal Form ◽

Wet Chemical ◽

Wet Chemical Route ◽

Final Composition ◽

Aluminium Nitrate Nonahydrate

Silica based ceramics are some of the most fundamental in crystal chemistry. The cristobalite form of silica has two modifications, α (low temperature, tetragonal form) and β (high temperature, cubic form). This paper describes our structural studies of unusual chemically stabilized cristobalite (CSC) material, a room temperature silica-based ceramic containing small amounts of dopants, prepared by a wet chemical route. It displays many of the structural charatcteristics of the high temperature β-cristobalite (∼270°C), but does not undergo phase inversion to α-cristobalite upon cooling. The Structure of α-cristobalite is well established, but that of β is not yet fully understood.Compositions with varying Ca/Al ratio and substitutions in cristobalite were prepared in the series, CaO:Al2O3:SiO2 : 3-x: x : 40, with x= 0-3. For CSC, a clear sol was prepared from Du Pont colloidal silica, Ludox AS-40®, aluminium nitrate nonahydrate, and calcium nitrate hexahydrate in proportions to form a final composition 1:2:40 composition.

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Synthesis, characterization and heavy metal removal efficiency of nickel ferrite nanoparticles (NFN’s)

Scientific Reports ◽

10.1038/s41598-021-83363-1 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Waheed Ali Khoso ◽

Noor Haleem ◽

Muhammad Anwar Baig ◽

Yousuf Jamal

Keyword(s):

Heavy Metals ◽

Nickel Ferrite ◽

Contact Time ◽

Metal Removal ◽

Heavy Metal Removal ◽

Ferrite Nanoparticles ◽

Batch Adsorption ◽

Aqueous Environment ◽

Human Beings ◽

Nickel Ferrite Nanoparticles

AbstractThe heavy metals, such as Cr(VI), Pb(II) and Cd(II), in aqueous solutions are toxic even at trace levels and have caused adverse health impacts on human beings. Hence the removal of these heavy metals from the aqueous environment is important to protect biodiversity, hydrosphere ecosystems, and human beings. In this study, magnetic Nickel-Ferrite Nanoparticles (NFNs) were synthesized by co-precipitation method and characterized using X-Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS) and Field Emission Scanning Electronic Microscopy (FE-SEM) techniques in order to confirm the crystalline structure, composition and morphology of the NFN’s, these were then used as adsorbent for the removal of Cr(VI), Pb(II) and Cd(II) from wastewater. The adsorption parameters under study were pH, dose and contact time. The values for optimum removal through batch-adsorption were investigated at different parameters (pH 3–7, dose: 10, 20, 30, 40 and 50 mg and contact time: 30, 60, 90, and 120 min). Removal efficiencies of Cr(VI), Pb(II) and Cd(II) were obtained 89%, 79% and 87% respectively under optimal conditions. It was found that the kinetics followed the pseudo second order model for the removal of heavy metals using Nickel ferrite nanoparticles.

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