In order to investigate the mechanism of Cu(II) adsorption
by chicken eggshells and the potential rate-controlling steps,
two of the most commonly used kinetic models, pseudo-firstorder and pseudo-second-order kinetic models were employed
to evaluate the adsorption of Cu(II). The linear form of
equations for the pseudo-first-order and pseudo-second-order
kinetic models can be represented by (6) and (7), respectively.