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The influence of pH and temperature changes on the adsorption behavior of organophilic clays used in the stabilization/solidification of hazardous wastes

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Uribe-Jongbloed, Alberto
Bishop, Paul L.
Pinto, Neville G
Abstract (Spanish)
Se abordó el efecto de la temperatura, el pH y la concentración de Na+/Ca2+ en el comportamiento de adsorción de la arcilla organofílica utilizada en la solidificación/estabilización de residuos peligrosos. La arcilla organofílica utilizada fue del tipo montmorillonita modificada por intercambio catiónico con una amina de sebo mezclada como sorbente. Los contaminantes utilizados en este trabajo fueron fenol, 2-clorofenol, anilina y clorobenceno. Inicialmente se estudió la 2-butanona (también conocida como metiletilcetona, MEK), pero los trabajos preliminares mostraron que la arcilla organófila la sorbía mal y no se siguió estudiando. Se realizó un grupo de ensayos isotérmicos para aclarar los comportamientos específicos de sorción debidos a los efectos de la temperatura, el pH elevado y la concentración de los cationes Na+ y Ca2+. La capacidad de adsorción de la arcilla organófila disminuyó de la siguiente manera: clorobenceno > 2-clorofenol > fenol > anilina. La desorción en entornos de pH elevado se observó para el fenol y el 2-clorofenol. Los cambios de temperatura, el aumento del pH o los incrementos de las concentraciones de Na+/Ca2+ no tuvieron ningún efecto sobre la adsorción ni de la anilina ni del clorobenceno.
Abstract (English)
The effect of temperature, pH, and Na+/Ca2+ concentration on the adsorptive behavior of organophilic clay used in the solidification/stabilization of hazardous wastes was addressed. The organophilic clay used was montmorillonite type clay modified by cation exchange with a mixed tallow amine as the sorbent. The contaminants used in this work were phenol, 2-chlorophenol, aniline, and chlorobenzene. 2-Butanone (also known as methyl ethyl ketone, MEK) was initially studied, but preliminary work showed that the organophilic clay poorly sorbed it and it was not studied further. A group of isothermal tests were performed to clarify specific sorption behaviors due to temperature effects, high pH, and concentration of the cations Na+ and Ca2+. The adsorption capacity of the organophilic clay decreased as follows: chlorobenzene > 2-chlorophenol > phenol > aniline. Desorption in high pH environments was seen for phenol and 2-chlorophenol. Changes in temperature, rise in the pH, or increases in Na+/Ca2+ concentrations had no effect on the adsorption of either aniline or chlorobenzene.
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11 páginas
URI: https://repositorio.escuelaing.edu.co/handle/001/2229
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AF - Centro de Estudios Ambientales
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