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Adsorption isotherms were performed in order to determine the equilibrium distribution of lead in the soils of the influence area of the mine La Vetica, located in the mining district of Buenos Aires in the Departamento del Cauca, Colombia, to determine its adsorption capacity and retention. Two adsorption models were evaluated, the first one assuming monolayer adsorption (homogeneous surface) such as Langmuir, Dubinin-Radushkevich and Frumkin isotherms; and second one that assumes multilayer adsorption (heterogeneous surface), for instance Freundlich, Harkins-Jura and Temkin isotherms. The Langmuir isotherm was the best fit model the adsorption process: the linearization of the Langmuir equation yielded a maximum retention capacity of lead in the soil, Qo , of 6.42 mg/g. The value of the adsorption energy, E , calculated by the Dubini-Radushkevich equation, was 15.81kJ/mol, this value is in the range of the Van der Waals bonds confirming the adsorption occurs through weak interactions.

Estudio De La Adsorción De Plomo En Suelos De La Región Minera En El Distrito De Buenos Aires En El Departamento Del Cauca, Colombia.