The adsorption of water-soluble dye reactive brilliant blue KN-R onto the f
unctionalized resin NKY has been dynamically and thermodynamically investig
ated. The adsorption rate constant is obtained from the first-order express
ion log(Q(e) - Q) = log Q(e) - k(ad)t/2.303. The adsorption is complex sinc
e the equilibrium data are well described by the Langmuir equation, the Fre
undlich equation, and the three-parameter equation. The first layer adsorpt
ion of KN-R onto NKY is physical, enhanced by a chemical effect, but multil
ayer adsorption is typically physical adsorption at normal temperature. The
adsorption process is endothermic. The obtained standard free energy chang
e and the inferred standard entropy change show that the adsorption of the
dye onto NKY can occur spontaneously. Moreover, the effect of pH and temper
ature on the adsorption has been explored. The apparent activation energy E
-a of the adsorption process has been calculated as well. (C) 2001 Academic
Press.