Salt-assisted solution combustion synthesis of ZnFe₂O₄ nanoparticles and photocatalytic activity with TiO₂ (P25) as nanocomposite

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  • Salt-assisted solution combustion synthesis of ZnFe<sub>2</sub>O<sub>4</sub> nanoparticles and photocatalytic activity with TiO<sub>2</sub> (P25) as nanocomposite

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Well-dispersed zinc ferrite (ZnFe2O4) nanoparticles were successfully prepared by a novel salt-assisted solution combustion process. The effects of types and amounts of the added salt on the properties of the products were investigated by XRD, SEM, and BET nitrogen adsorption techniques. The results indicated that the introduction of salt into reaction system facilitate the formation of well-dispersed spinel zinc ferrite and increase specific surface area of the resultants from 7.14 to 88.34 m2·g−1 when KCl/M ratio is 2/3. A visible-light-active ZnFe2O4/TiO2 photocatalyst was prepared by physically grinding the ZnFe2O4 nanoparticles with TiO2 (P25) at ambient temperature, and it exhibited excellent photocatalytic activity for the mineralization of rhodamine B. With increasing of ZnFe2O4 amount from 0 to 3wt %, the activity of ZnFe2O4/TiO2 composite increased. The maximum photoactivity is observed when the amount of ZnFe2O4 is 3 wt % and more than 97% of rhodamine B disappears after 4 h visible-light irradiation.

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