Chemical modification of activated carbons and its effect on the adsorption of phenolic compounds
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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 of activated carbons without post further heating continued creating changes in surface chemistry and porous structure.
- Nelson G. Rincón-Silva, Wandy M. Ramirez-Gomez, Carolina Mojica-Sánchez, Diego A. Blanco-Martínez, Liliana Giraldo, Juan C. Moreno-Piraján, Obtaining of activated carbon from seeds of eucalyptus by chemical activation with H3PO4. Characterization and evaluation of adsorption capacity of phenol from aqueous solution , Ingeniería y Competitividad: Vol. 16 No. 1 (2014)
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