Eggshell waste was successfully used for the removal of heavy metal ions from model solutions. The
effect of ball milling on the structure and adsorption ability of eggshell (ES) and its membrane (ESM) was
investigated, with the conclusion that milling is benefitial only for the ES. The adsorption experiments
showed that the ESM is a selective adsorbent, as the adsorption ability toward different ions decreased in
the following order: Ag(I) > Cd(II) > Zn(II). The obtained Qm values for Ag(I) adsorption on the ESM and
ES were 52.9 and 55.7 mg g1, respectively. The potential industrial application of ES was also demonstrated
by successful removal of Ag(I) from the technological waste.