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In this study, nZVI prepared by borohydride reduction was applied for the removal of Cu²⁺ ions under a variety of experimental conditions. The uptake experiments investigated the effects of initial concentration, contact time, pH, and repetitive loading on the extent of retardation of Cu²⁺ ions. Within the applied conditions, the sorbent demonstrated fast uptake kinetics and outstanding fixation abilities up to an initial Cu²⁺ concentration of 200.0 mg/L. Partitioning of Cu²⁺ ions between liquid and solid phases demonstrated an isotherm of L-type. Within the studied conditions, the capacity of uptake was found to be 250 mg of Cu²⁺ per g of nZVI. According to X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) results, Cu²⁺ ions were sorbed primarily via a redox mechanism that resulted in the formation of Cu₂O and Cu⁰. The contact of iron nanoparticles with aqueous media caused extensive formation of …