Adsorción del cianuro contenido en solución acuosa usando carbón activo obtenido de residuo de café: eficiencia de absorción, modelado de equilibrio y cinética
DOI:
https://doi.org/10.17268/sci.agropecu.2019.03.01Keywords:
Adsorción, carbón activo, cianuro, isotermas, residuos de café.Abstract
Esta investigación tuvo como objetivo, evaluar el proceso de adsorción del CN- contenido en solución acuosa sintética, usando carbón activo obtenido de residuo de café; estudiando su eficiencia y los modelos de equilibrio y cinético. Análisis de infrarrojo con transformada de Fourier (FTIR), difracción de rayos X (DRX) y determinación del número de yodo se realizaron para caracterizar al carbón activo. Se aplicó un diseño central compuesto (DCC) con tres factores adaptados a tres niveles cada uno y 6 puntos centrales para estudiar el efecto del pH (A), el tiempo de contacto (B) y la dosificación de adsorbente (C); según el análisis de varianza, todos los factores principales y la interacción AA fueron significativas en la eficiencia de adsorción de cianuro sobre el carbón activo, cuyo valor máximo alcanzado fue de 54,68% y de 67,65% para el nivel predictivo. De acuerdo al coeficiente de determinación (R2), el modelo isotérmico de Freundlich (0,954) y las tres ecuaciones cinéticas de pseudo segundo orden (0,991, 0,993, 0,993) se ajustaron al proceso experimental. De los resultados obtenidos, el carbón activo preparado de residuo de café puede ser utilizado como potencial adsorbente de CN-, contenido en soluciones acuosas de bajas concentraciones.
Author Biographies
Gonzalo Aranguri-Llerena, Universidad Nacional de Trujillo
Wilson Reyes-Lázaro, Universidad Nacional de Trujillo.
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Received March 6, 2019.
Accepted August 26, 2019.
Corresponding author: garanguri@hotmail.com (G. Aranguri-Llerena).
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