Notes

The green synthesis of copper oxide nanoparticles (CuO NPs) using Theobroma cacao leaf extract holds significant local importance, particularly in regions like Nigeria and other cocoa-producing areas where cacao plants are abundant. This approach adds value to agricultural waste, as cacao leaves—often discarded—can be utilized as a cost-effective, renewable resource for nanoparticle production. Moreover, the synthesized CuO NPs have promising applications in addressing local environmental challenges such as wastewater contamination from textile and dye industries. Their potential use in adsorbing methylene blue dye demonstrates a sustainable solution for water purification, contributing to improved public health and environmental safety. Beyond environmental remediation, locally produced CuO NPs can find applications in antimicrobial coatings, sensors, and catalytic processes—encouraging local innovation, reducing dependence on imported materials, and promoting eco-friendly nanotechnology practices that align with green chemistry principles.