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Equilibrium and thermodynamics of Chromium (VI) adsorption on inert biomasses of Dioscorea rotundata and Elaeis guineensis

Resumen

El equilibrio de adsorción en bioadsorbentes fue estudiado y ajustado a los modelos de isoterma de Langmuir, Freundlich y Dubinin-Radushkevich, usando cáscaras de ñame (YP) y residuos de palma de acete (OPW) como bioadsorbentes en la remoción de cromo hexavalente presente en soluciones acuosas en sistema por lotes, evaluando el efecto de la temperatura, dosis de adsorbente y tamaño de partícula sobre el proceso. Los parámetros termodinámicos fueron estimados mediante el método gráfico de Van’t Hoff. Se encontró que la máxima capacidad de adsorción se obtuvo al usar 0.03 g de adsorbente, 55 °C y 0.5 mm de tamaño de partícula. El equilibrio de adsorción sobre OPW fue descrito por las isotermas de Langmuir y Freundlich, mientras que sobre YP por el modelo de Dubinin-Radushkevich, indicando que la adsorción se da por intercambio iónico entre los centros activos y el ion metálico. El estudio termodinámico estimó que la eliminación sobre YP es endotérmico, irreversible y no espontáneo, y el proceso sobre OPW es exotérmico, espontáneo a baja temperatura e irreversible.

Palabras clave

Bioadsorption, Langmuir, Freundlich, Dubinin-Radushkevich


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