pH-tuneable phyto-synthesized hierarchical Hausmannite nanostructures for rapid and efficient removal of methylene blue from aqueous solutions
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Date
2021
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Journal of Materials and Environmental Sciences
Abstract
Hierarchical Mn3O4 nanostructures were successfully synthesized through a phytomediated route. Phytochemicals from the aqueous extract of Azadirachta indica acted as both capping and stabilizing agents during synthesis. An average crystallite size of 53.01±1.89 nm was obtained from XRD studies for hierarchical nanostructures. FESEM highlighted the effects of reaction pH on the morphology of the nanoparticles. Reaction pH values of 6, 8 and 10 resulted in rod-like nanoparticles while reaction pH 12 gave rise to hierarchical structures. The profiles of the degradation of methylene blue in the presence of H2O2 showed that the calcined nanoparticles performed better than assynthesized nanoparticles. Degradation ability of the nanoparticles generally increased with increasing reaction pH. Hierarchical nanoparticles exhibited superior degradation ability of 89% after 100 minutes. In principle, the hierarchical Mn3O4 nanostructures might be envisaged as efficient oxidants for the treatment of organic dye-containing wastewater under similar degradation conditions.
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Bankole-Ojo, O. S. and Oyedeji, F. O. (2021). pH-tuneable phyto-synthesized hierarchical Hausmannite nanostructures for rapid and efficient removal of methylene blue from aqueous solutions. Journal of Materials and Environmental Sciences. 12(2); 346-352.