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15% and 396.6mg.g 1, respectively, under optimal conditions after 5 minutes. The selectivity of SnO -ZnO-eggshell nanocomposites for the adsorption of metal ions was studied, and the highest selectivity was obtained for adsorption of Hg (II) ions. Furthermore, the SnO - ZnO-eggshell nanocomposites could be recovered and reused at least three times without considerable loss of their efficiency. The present approach has advantages such as rapidity, simplicity, selectivity, low cost and, most importantly, the use of nanocomposites containing a bio-waste materi