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Activated cocoa pod carbon was synthesized and used for the removal of heavy metal ions (Zn, Cd, and Pb) from an aqueous solution by varying concentration, contact time, adsorbent dosage and pH. The activated cocoa pod carbon showed great affinity to lead with highest removal percentage with 98.4% removal when varied concentration was 50 mg/L, 94.6% removal at contact time of 40 mins, 94.0% removal at pH value 8 and at adsorbent dosage of 0.6g concentration 7.135 mg/g was adsorbed. The results also showed varying metal with least affinity between cadmium and zinc with Zn at 80.6% removal when varied concentration was at 10 mg/L, Cd at 62.3 % removal with contact time of 20 mins, Cd at 75.8% removal with pH value 2 and Cd with adsorbent dosage of 1.0g concentration, 2.163mg/g was adsorbed. Under the experimental conditions, pH, contact time, adsorbent dosage and varying concentration plays an important role in the adsorption process, particularly on the adsorption capacity. From the experiment, it can be concluded that activated carbon from cocoa pods have the ability to adsorb Zn2+, Cd2+ and Pb2+ ions from an aqueous solution.
