This research explores the synthesis and application of carbon-based adsorbents derived from olive stones and almond shells as low-cost biomass precursors through carbonization at 600°C combined with chemical activation using KOH, H3PO4 and ZnCl2 with carbon/activating agent (C/A) ratios of 1:2 and 1:4 (w/w) at 850°C for the removal of Cu2+ and Pb2+ ions from aqueous solutions. The carbons produced were characterized using different techniques including SEM-EDX, FTIR, XRD, BET analysis, CHNS elemental analysis and point of zero charge determination. Batch-mode adsorption experiments were carried out at adsorbent doses of 2 and 5 g L-1, initial metal concentrations of 100 and 500 mg L-1 and natural pH (around 5) with agitation at 350 rpm and 25°C for 24 h. KOH-activated carbons, especially at a 1:4 (w/w) ratio, exhibited superior adsorption performance mainly due to their favorable surface characteristics and functionalities. The greatest adsorption efficiency reached 100% (101.41-101.68 mg g-1) for Pb2+ at 500 mg L-1 and 5 g L-1 dosage, and 84.63-86.29% (41.69-42.52 mg g-1) for Cu2+ at 100 mg L-1 and 2 g L-1 dosage. The results of this study will help advance knowledge in the design and optimization of adsorption processes for heavy metal removal, benefiting industries seeking green technologies to mitigate environmental pollution.