Okpala-Chinonso, A.N. et al. 2026. Synthesis and Characterization of Composite Copper – Iron Nanoparticles from Copper Tailings using Sodium Borohydride as Reductant. European Journal of Applied Sciences. 14, 03 (Jun. 2026), 390–408. DOI:https://doi.org/10.14738/ejas.1403.8934.