Resumo

SUN-KOU, María del Rosario et al. Adsorption of heavy metals using activated carbons prepared from aguaje stones. Rev. Soc. Quím. Perú [online]. 2014, vol.80, n.4, pp.225-236. ISSN 1810-634X.

Aguaje seed (a typical Amazonian forest fruit) was used as a precursor material for the production of activated carbon using phosphoric acid as activating agent in two different concentrations: 0,75 and 1,0 g_H3PO4/g_Precursor. The physicochemical properties were studied by N₂ sorption measurements, Boehm titration, scanning electron microscopy and energydispersive X-ray spectroscopy. Activated carbons were used in the adsorption of three heavy metals: lead, cadmium and chromium. The maximum adsorption capacity was achieved using activated carbon AG0,75_600 in a solution with a pH greater than 4 and the values obtained were in the following order: lead (74,8 mg g^-1), cadmium (26,5 mg g^-1), chromium (18,8 mg g^-1). The most important factors influencing the adsorption process were the pH of the solution, the porous structure and surface acidity of the activated carbon.

Palavras-chave : activated carbon; aguaje stones; lead; cadmium; chromium.

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