<i>Amaranthus spinosus</i> Leaf Extract Mediated FeO Nanoparticles: Physicochemical Traits, Photocatalytic and Antioxidant Activity

Iron oxide nanoparticles were synthesized using Amaranthus spinosus leaf aqueous extracts reducing from ferric chloride. A. spinosus leaf extract is a rich source of amaranthine and phenolic compounds with high antioxidant and these molecules were used as reducing agents. The operating parameters of nanoparticles synthesis were optimized. Physicochemical, optical, and magnetic properties of synthesized nanoparticles were characterized using analytical techniques. Results confirmed that A. spinosus leaf extract mediated iron oxide nanoparticles are spherical shape with rhombohedral phase structure, smaller size, and large surface with less aggregation. The photocatalytic and antioxidant activities of leaf extract as well as sodium borohydride mediated iron oxide nanoparticles were studied. The percentage decolorization of methyl orange and methylene blue was 75% and 69%, respectively, for extract mediated iron oxide nanoparticles under sunlight. The antioxidant efficiency was also observed to be 93% against 2,2-diphenyl-1-picrylhydrazyl. The extract mediated iron oxide nanoparticles showed better photocatalytic and antioxidant capacity than sodium borohydride mediated nanoparticles

Strategy for Multifunctional Hollow Shelled Triple Oxide Mn–Cu–Al Nanocomposite Synthesis via Microwave-Assisted Technique

A facile route for assembling hollow shelled triple Mn–Cu–Al oxide nanomaterials (HMCA) using the microwave-assisted reduction technique is demonstrated, and the energy and environmental applications such as supercapacitor and photocatalyst are investigated. During the reaction time, MnO₂, CuO, and Al₂O₃ formed a shell layer over the core SiO₂ and assembled as a hollow geometrical nanostructure with a uniform size densely populated hairy outer appearance. We have shown that the resultant HMCA exhibited the synergistic effects of a nanocomposite and thereby revealed a distinctive collection of physical and chemical properties such as improved electrochemical capacitive performance capacities, enhanced photocatalytic activities, and increased adsorption. These features collectively confirmed the potential of HMCA as an attractive material for resourceful applications in environmental and energy storage issues