No abstract

No abstract

No abstract

a b s t r ac tBased on pseudo-first-order and pseudo-second-order equations, the kinetic study on the adsorption/ desorption process of activated carbon upon various operation parameters using single-pass mode was conducted for the first time. An optimum flow rate for desorption was found, below or beyond which desorption rate could decrease due to the long retention and turbulence respectively. The adsorption rate rose with an increase of influent concentration but the increasing trend of adsorption capacity was not obvious, while desorption rate fell due to the decrease of concentration gradient between micropores and external solution. The salt ions could not penetrate into or out of the whole electrode for thick electrodes within a reasonable period. As the applied voltage increased, the adsorption capacity of activated carbon increased while both the adsorption rate and the desorption rate decreased. Kinetics analysis indicated that the adsorption/desorption process of KCl in activated carbon electrodes followed pseudo-first-order kinetics model.