To synthesize Al/K nanoparticles, 70 mL of the prepared precursor solution was combined with 30 mL of the P. longifolia extract in a 250 mL beaker. The mixture was heated on a hot plate at 60-70°C with continuous stirring. Concentrated sulphuric acid (0.1 mL) was added dropwise until a pH of 6.2 was achieved. A colour change from dark brown to light brown indicated nanoparticle formation. The mixture was left undisturbed for 24 hours to confirm nanoparticle stability. Green-synthesized P. longifolia-aluminium/potassium nanoparticles (Pl-Al/KNPs) were separated via centrifugation (centrifuge KA-1000), and the collected nanoparticles were dried in an oven at 45°C.