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Se prepararon carbones activados con bagazo de caña de azúcar (BC) y zuro de maíz (ZM) para adsorber cadmio y plomo. BC y ZM fueron carbonizados a 400°C por 1 hora, activados con ácido fosfórico y modificados con ácido nítrico o peróxido de hidrógeno y posterior calentamiento. La activación aumentó el área superficial de los carbones (5 m2/g a 778 m2/g para el ZM y 3 m2/g a 369 m2/g para BC). Los grupos oxigenados se analizaron por IR-DRIFTS. La acidez de los carbones estuvo entre 1.36 y 2.12 meq/g, el pH entre 2.9 y 6.5, y las capacidades de intercambio iónico hasta 0.070 meq/g (absorción atómica).
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