Review on magnetically retrievable spinel ferrites MFe2O4/TiO2 (M=Co, Zn) composites and its application for photocatalytic removal of pollutants

Magnetically retrievable nanocatalysts are the most sustainable materials that have efficient photocatalytic ability due to large surface area, selectivity, and good recyclability without losing its activity. The use of such materials in the photocatalysis enhances the recoverability of photocatalyst which can be separated using external magnetic field that makes the recovery much easier and reduces the loss of photocatalyst associated with the traditional filtration and centrifugation methods. This concept aligns with green chemistry protocols in terms of environmental and economic requirements for sustainability. In this review, we aim to provide insight in the recent research done on TiO 2 loaded on the ferrite nanocomposites TiO 2 /MFe 2 O 4 (M = Co, Zn) in environmental remediation. When doped with metals, spinel ferrite nanocomposites demonstrate outstanding photocatalytic activity for the dye degradation. Dye degradation and removal of other organic pollutants are an environmental benign process when using a magnetically retrievable photocatalyst. Magnetic retrievable property helps in separating the photocatalyst from the reaction mixture and eliminating the need for filtration. Most organic pollutants can be removed using magnetic spinel ferrite composites, and their efficiency can be further enhanced through various strategies.