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- Title
Dependence of phase distribution and magnetic properties of milled and annealed ZnO·Fe<sub>2</sub>O<sub>3</sub> nanostructures as efficient adsorbents of heavy metals.
- Authors
Khezami, L.; Alwqyan, T. S.; Bououdina, M.; Al-Najar, B.; Shaikh, M. N.; Modwi, A.; Taha, Kamal K.
- Abstract
Mixed oxides and ferrites nanoparticles (NPs) have shown a considerable potential in environmental applications of purifying wastewater from heavy metal by adsorption. In this paper, ZnO·Fe2O3 powders mixture were mechanical milled followed by annealing at 500, 600 and 700 °C. X-ray diffraction characterization confirmed the phase composition and showed crystal growth from 7 to 11 nm due to annealing. Scanning electron microscope revealed agglomerated and spherical particles that increased in size with same trend as XRD results. These nanopowders exhibited a ferromagnetic behavior with varying magnetization and coercivity, the saturation magnetization was found to decrease from 1.45 to 0.09 emu/g with increasing annealing temperature. This was explained due to phase transition and the allocation of A and B atoms in the tetrahedral and octahedral sites in ferrites as a result of annealing. Moreover, BET surface calculations showed an un-patterned pore size distribution with a maximum surface area of 1.84 m2/g obtained after annealing at 500 °C. This sample also demonstrated the highest adsorption capacity at 49.42, 54.69 and 12.34 mg/g for heavy metals ions of nickel, cadmium and chromium, respectively.
- Subjects
ZINC oxide; NANOSTRUCTURES; HEAVY metals; CRYSTAL growth; MAGNETIZATION
- Publication
Journal of Materials Science: Materials in Electronics, 2019, Vol 30, Issue 10, p9683
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-019-01303-2