High-efficiency nickel recovery from spent electroless nickel plating solution: effective degradation of high-concentration nickel complexes to form a nickel ferrite nanomaterial via Fe3O4 catalytic oxidation

High-concentration organic nickel complexes were efficiently degraded and converted into NiFe 2 O 4 nanomaterials via Fe 3 O 4 catalytic oxidation under alkaline conditions, with high removal efficiency of nickel (99.99%) and TOC (81.94%), respectively.