Spinel ferrites/metal oxide nanocomposites for waste water treatment

Spinel ferrites (MFe 2 O 4 , M divalent metallic ion) and their nanocomposites with specific metallic oxides (ZnO, TiO 2 , CeO 2 ) have attracted the interest of researchers for studying the decontamination of wastewater using photocatalysts, due to the fact MFe 2 O 4 nanoparticles (NPs) are stable and handy to separate after being used due to its incredible magnetic behavior. With this background, the latest growth on photocatalytic performances of MFe 2 O 4 -based binary nanocomposites have been comprehensively revised. Particularly, a much interest rising on MFe 2 O 4 /metal NPs, MFe 2 O 4 /metal oxides, MFe 2 O 4 /polymers, MFe 2 O 4 /carbon-based materials, and MFe 2 O 4 /other compounds for the photocatalytic decomposition of dyes. In this review, nanocomposites of MFe 2 O 4 as photocatalysts are discussed in detail. This review paper has explained the advantageous pathway for the generation of free radicals with the help of these catalysts in the presence of visible and UV light. This review sums up that MFe 2 O 4 -based nanocomposites with metal oxide have valuable application in purification of water. Nevertheless, their sensible consumption in wastewater treatment plants still needs additional studies.