DETERMINACIóN DE ISOTERMAS DE ADSORCIóN Y ENTALPIAS DE INMERSIóN DE CARBON ACTIVADO EN SOLUCIONES ACUOSAS DE 3-CLORO FENOL A DIFERENTE pH

the effect that produces the solution ph in the adsorption and the immersion enthalpy of an activated carbon in 3-chloro phenol aqueous solutions are studied. the activated carbon presents a surface area of 685 m2g-1, major acid total groups content and a ph in the point of zero charge, lightly acid. the ph values at which the adsorption isotherms and immersion enthalpies were realized are 3, 5, 7, 9 and 11. the results of the adsorption are fitted to the langmuir model and the values of the maximum quantity adsorbed that are between 96.2 and 46.4 mgg-1 were obtained for each ph value and values between 0.422 and 0.965 lmg-1 for the langmuir constant. the maximum quantity adsorbed diminishes with ph, a similar behavior is obtained with regard to the immersion enthalpies; the maximum value for these properties is for ph 5. the immersion enthalpies of the activated carbon in a 3-chloro phenol solution of constant concentration are determined for the different ph values, with a maximum value of 37.6 jg-1 for ph 5. immersion enthalpies of the activated carbon in function of 3-chloro phenol solution concentration are determined at ph 5, of maximum adsorption, and the maximum immersion enthalpy is calculated, with a value of 41.67 jg-1.