Todo proceso de adsorción es estudiado y evaluado en la condición de equilibrio, la cinética y sus características termodinámicas. En cada caso se evalúan ciertos parámetros que proveen información útil para el control del sistema adsorbente-adsorbato. En el equilibrio, estos parámetros se obtienen en gran medida desde las isotermas, así pueden conocerse las características de la interacción adsorbente-adsorbato en el rango de concentraciones de trabajo. En la bioadsorción o biosorción, una técnica de la bioremediación, y parte de las tecnologías considera-das limpias para solucionar el problema de contaminación ambiental, los datos se analizan con criterios generales de un proceso de adsorción. Su estudio es aplicable a la "recuperación" de metales y para "remover" especies contaminantes o tóxicas de aguas o efluentes de operaciones industriales.

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The contribution of the pH on the bio-removal of heavy metals is evaluated from two points of view: the metallicion, by means of use of ions with the same charge, and that of the biosorbent, using several natural biosorbents on the adsorption of a common metal. The results show a strong pH effect in the metallic ion's aqueous chemistry, dueto a complex chemical speciation dominated by aquo and hydroxo-complexes, which is partially conditioned by the own cation's acidity. The characteristically functional groups, present on the adsorbent's surface, are also subject to pH effect, because of the strong competence with exchangeable ions (H3O+ ) for the ionizables active centers. lt has been experimentally proved the preference of the studied biosorbents for Cd +2 ion rather than Zn +2 , being the algae Lessonia trabeculata, polyalginaterich algae, in its both varieties, non and cross...

The contribution of the pH on the bio-removal of heavy metals is evaluated from two points of view: the metallicion, by means of use of ions with the same charge, and that of the biosorbent, using several natural biosorbents on the adsorption of a common metal. The results show a strong pH effect in the metallic ion's aqueous chemistry, dueto a complex chemical speciation dominated by aquo and hydroxo-complexes, which is partially conditioned by the own cation's acidity. The characteristically functional groups, present on the adsorbent's surface, are also subject to pH effect, because of the strong competence with exchangeable ions (H3O+ ) for the ionizables active centers. lt has been experimentally proved the preference of the studied biosorbents for Cd +2 ion rather than Zn +2 , being the algae Lessonia trabeculata, polyalginaterich algae, in its both varieties, non and cross...

The contribution of the pH on the bio-removal of heavy metals is evaluated from two points of view: the metallicion, by means of use of ions with the same charge, and that of the biosorbent, using several natural biosorbents on the adsorption of a common metal. The results show a strong pH effect in the metallic ion's aqueous chemistry, dueto a complex chemical speciation dominated by aquo and hydroxo-complexes, which is partially conditioned by the own cation's acidity. The characteristically functional groups, present on the adsorbent's surface, are also subject to pH effect, because of the strong competence with exchangeable ions (H3O+ ) for the ionizables active centers. lt has been experimentally proved the preference of the studied biosorbents for Cd +2 ion rather than Zn +2 , being the algae Lessonia trabeculata, polyalginaterich algae, in its both varieties, non and cross...