Publicado

2021-08-25

Materiales carbonosos preparados a partir de cuesco de palma en la adsorción de CO2. Caracterización elemental, próxima y morfológica

Carbonaceous materials prepared from Palm shells for the adsorption of CO2. Elemental, proximal, and morphological characterization

Materiais carbonosos preparados a partir de Cuesco de Palma en a adsorção de CO2. Caracterização elementar, proximal e morfológica

DOI:

https://doi.org/10.15446/rev.colomb.quim.v50n2.95020

Palabras clave:

análisis proximal, análisis elemental, carbón activado, adsorción de CO2 (es)
Análise proximal, análise elementar, carvão ativado, adsorção de CO2 (pt)
Proximal analysis, elemental analysis, activated carbon, CO2 adsorption (en)

Autores/as

  • Sergio Alberto Acevedo Corredor Universidad Nacional de Colombia
  • Liliana Giraldo Gutiérrez Universidad Nacional de Colombia
  • Juan Carlos Moreno Piraján Universidad de los Andes

En la presente investigación se prepararon sólidos porosos tipo carbón activado (CA) a partir de la activación química del cuesco de palma africana procedente de los cultivos de la región de la Guajira, Colombia, con soluciones de Fe(NO3)3 y Cu(NO3)2 con cambio en la concentración a dos diferentes temperaturas: 973 y 1073 K. Los sólidos adsorbentes preparados se caracterizaron para determinar sus propiedades fisicoquímicas y capacidades de adsorción de CO2.

Los CA obtenidos presentan micro-mesoporosidad con áreas superficiales entre 5 y 1300 m2g-1. Los valores con respecto al contenido de carbono fijo se encuentran entre 47,1 y 78,4%; los resultados evidencian que el proceso de activación tiene efectos sobre los parámetros texturales, composición elemental y proximal de los sólidos obtenidos. También se realizó la caracterización morfológica de la superficie de los materiales con SEM evidenciando la formación de mayor rugosidad en las muestras activadas a 1073 K, específicamente, los carbones activados con el nitrato cúprico; además, mediante EDX se cuantificó la presencia de algunos elementos. Los valores obtenidos de la adsorción de CO2 a bajas presiones se encuentran entre 80 y 250 mg·g-1, evidenciándose una mayor afinidad hacia los sólidos adsorbentes (MCu3 y MFe5).

In the present investigation, porous solids type activated carbon (CA) were prepared from the chemical activation of the African palm shells from the crops of the Guajira region,  Colombia, with solutions of Fe(NO3)3 and Cu(NO3)2 with change in concentration at two different temperatures: 973 and 1073 K. The prepared adsorbent solids were characterized to determine their physicochemical properties and CO2 adsorption capacities.

The CAs obtained present micro-mesoporosity with surface areas between 5 and 1300 m2g-1. The values with respect to the fixed carbon content are between 47.1% and 78.4%; the results show that the activation process has effects on the textural parameters, elemental and proximal composition of the solids obtained. The morphological characterization of the surface of the materials was also carried out with SEM, evidencing the formation of greater roughness in the samples activated at 1073 K, specifically, the activated carbons with cupric nitrate; furthermore, the presence of some elements was quantified by EDX. The values obtained from the adsorption of CO2 at low pressures are between 80 and 250 mg·g-1, showing a greater affinity towards adsorbent solids (MCu3 and MFe5).

Na presente investigação, sólidos porosos do tipo carvão ativado (CA) foram preparados a partir da ativação química do Cuesco de Palma Africana de lavouras da região de Guajira-Colômbia com soluções de Fe(NO3)3 e Cu(NO3)2 com alteração em concentração em duas temperaturas diferentes 973 e 1073 K. Os materiais preparados foram caracterizados para avaliar suas propriedades físico-químicas e capacidades de adsorção de CO2.

Os (CAs) obtidos apresentam micro-mesoporosidade com áreas superficiais entre 5 e 1300 m2g-1. Os valores com relação ao teor de carbono fixo estão entre 47,1 - 78,4%, os resultados mostram que o processo de ativação tem efeitos nos parâmetros texturais, composição elementar e proximal dos sólidos obtidos. A caracterização morfológica da superfície dos materiais também foi realizada com MEV, evidenciando a formação de maior rugosidade nas amostras ativadas a 1073 K, especificamente os carbonos ativados com nitrato cúprico, e a presença de alguns elementos foi quantificada por EDX. Os valores obtidos na adsorção de CO2 em baixas pressões estão entre 80-250 mg·g-1, mostrando uma maior afinidade para sólidos adsorventes (MCu3 e MFe5).

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[1]
S. A. Acevedo Corredor, L. Giraldo Gutiérrez, y J. C. . Moreno Piraján, «Materiales carbonosos preparados a partir de cuesco de palma en la adsorción de CO2. Caracterización elemental, próxima y morfológica», Rev. Colomb. Quim., vol. 50, n.º 2, pp. 30–39, ago. 2021, doi: 10.15446/rev.colomb.quim.v50n2.95020.