Mechanism of adsorption of dyes and phenols from water using activated carbons prepared from plum kernels

The kinetics and mechanism of adsorption of two commercial dyes (BR22., AB2 5), phenol, and 3-chlorophenol from water on activated carbons were studied at 30 degrees C. The activated carbons were prepared from plum kernels, an d the activation temperature and time tested were in the ranges 750-900 deg rees C and 1-4 h, respectively. Three simplified kinetic models including a pseudo-first-order, a pseudo-second-order, and an intraparticle diffusion model were tested. It was shown that the adsorption of both phenols could b e fitted to a pseudo-second-order rate law, and that of both dyes could be fitted to an intraparticle diffusion model. Kinetic parameters were calcula ted and correlated with the physical properties of the adsorbents. (C) 2000 Academic Press.