Resumo

CARVAJAL-BERNAL, Ana M.; GOMEZ, Fernando; GIRALDO, Liliana  e  MORENO-PIRAJA, Juan C.. Modificación química de carbones activados y su efecto en la adsorción de compuestos fenólicos. Ing. compet. [online]. 2015, vol.17, n.1, pp.109-119. ISSN 0123-3033.

In this paper two commercial activated carbons, granular and pelletized, were impregnated with aqueous solutions of phosphoric acid (H3PO4), or potassium hydroxide (KOH) in 60% w/w concentrations under moderate temperature conditions (18 °C). It was observed that the impregnation with phosphoric acid increases the adsorption of 2,4-dinitrophenol regarding the starting activated carbon. The adpsorption was determined from isotherms in aqueous solution of phenol and 2,4-dinitrophenol, and experimental data were adjusted to the Freundlich, Langmuir, Toth and Prausnitz-Radke models. Langmuir was the model that best fitted for phenol adsorption, and Toth was the model that best fitted the for 2,4-dinitrophenol adsorption. The results showed that the impregnation

Palavras-chave : 2,4-dinitrophenol; impregnation; isotherm adsorption; modification; phenol; phosphoric acid; sodium hydroxide.

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