“…However, to this end, only few precious metals such as silver and gold are recovered from the PCBs, whereas most of the base metals being of lesser economical values are left as such which eventually ends up in landfills. ,− One such metal is Cu, which also happens to be in major proportion as compared to other metals in PCBs. − Recently, a lot of efforts have been advocated to trap this metal and put back in recycling loop, and therefore many laboratories have reported processes related to its recovery. − Cu, apart from having applications in the electronic industry as a conductive metal, have recently shown huge potential in various futuristic technologies if produced in the form of nanoparticles (NPs) . Copper oxide nanoparticles, commonly referred to as CuO NPs, have shown quite unique physicochemical properties, e.g., electron correlation effects and spin dynamics, narrow band gaps, extremely high surface areas, and unusual crystal morphologies, and therefore have found immense application in various advance fields, like catalysts in rocket propellants, antifouling material in ship hulls and submarines, semiconductive materials in the electronic industry, electrode materials for batteries, catalysis, sensors, antiviral and antibacterial materials for public safety, especially during pandemics, etc. Therefore, there exists huge potential in selectively recovering Cu from e-waste and its transformation to CuO NPs for high-end applications.…”