Equilibrio de adsorción del colorante azul de metileno sobre carbón activado
Adsorption equilibrium of methylene blue dye on activated carbon
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Los colorantes sintéticos son una clase importante de compuestos orgánicos que, con frecuencia, se encuentran en el medio ambiente, como resultado de su amplio uso industrial, convirtiéndose en agentes que, desafortunadamente, afectan la ecología. La disposición de estos colorantes a los recursos de agua se debe evitar; para tal efecto, se utilizan varias técnicas de tratamiento, siendo la adsorción una de las más empleadas. Este artículo presenta un estudio sobre la adsorción del colorante azul de metileno (AM) en disolución acuosa sobre carbón activado granular (CAG) a 25°C. Se realizaron experimentos por lote para determinar el efecto de la concentración inicial (300-1100mg dm-3) y del pH (4-8), sobre la capacidad de adsorción y el porcentaje de remoción. Las isotermas de equilibrio fueron analizadas a partir de las ecuaciones de Langmuir y Freundlich usando el coeficiente de correlación. Los datos experimentales muestran un ajuste satisfactorio con el modelo de isoterma de Langmuir. Los valores de capacidad máxima de adsorción de AM en monocapa obtenidos fueron de 76,3; 79,4; 80,6; 83,3 y 87mg g-1 a los pH de 4, 5, 6, 7 y 8, respectivamente.
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