Browsing by Autor "Diana P. Vargas"

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Carbon dioxide and methane adsorption at high pressure on activated carbon materials
(Springer Science+Business Media, 2013) Diana P. Vargas; Liliana Giraldo; Juan Carlos Moreno‐Piraján
CO2 adsorption on binderless activated carbon monoliths
(Springer Science+Business Media, 2010) Diana P. Vargas; Liliana Giraldo; Joaquín Silvestre‐Albero; Juan Carlos Moreno‐Piraján
Preparation and Characterization of Activated Carbon Monoliths with Potential Application as Phenol Adsorbents
(Hindawi Publishing Corporation, 2009) Diana P. Vargas; Liliana Giraldo; Juan Carlos Moreno‐Piraján
A series of different activated carbons of both honeycomb and disc type were prepared by chemical activation of coconut shells with zinc chloride at different concentrations, without the use of a binder. The structures were characterized by N 2 adsorption at 77 K and scanning electron microscopy (SEM), and also some samples were characterized by immersion calorimetry in benzene. These were subsequently used in the adsorption of phenol in aqueous solution. The experimental results indicat that activation with zinc chloride produced a large development of microporosity with a micropore volume of 0.38 to 0.79 cm 3 g -1 , BET area between 725 and 1523 m 2 g -1 and the capacity to adsorb phenol. In addition, the BET and Langmuir models were applied to isotherm data.
Síntesis de Monolitos de Carbón activado: análisis comparativo entre las características texturales y energéticas determinadas mediante calorimetría de inmersión
(Association of Chemists of the Chemical Institute of Sarria, 2011) Diana P. Vargas; Liliana Giraldo Gutiérrez; Juan Carlos Moreno‐Piraján
Los monolitos de carbon activado tipo disco se prepararon mediante la activacion quimica de cascara de coco con cloruro de zinc y acido fosforico, usados por separado, a diferentes concentraciones, sin el uso de ligantes organicos. Las estructuras se caracterizaron por adsorcion de N 2 a 77 K, y calorimetria de inmersion en benceno. Los resultados experimentales mostraron que la activacion con cloruro de zinc y acido fosforico produce un amplio desarrollo de porosidad, con volumenes de microporo entre 0,38 y 0,81 cm 3g-1, area superficial aparente entre 832 y 1546 m 2g-1 y entalpia de inmersion entre 96,4Jg -1 y 167,9 Jg-1. Se establecieron correlaciones entre los parametros texturales y las caracteristicas energeticas de las muestras.