Inorganic and organic wastes have received increasing interests in decontamination process of industrial effluents containing heavy metals, because are cost-effective and eco-friendly. In this study, a new adsorbent, obtained by mixing clay with PET flakes (ration 1:5) was tested for removal of Hg(II) ions from aqueous solutions, compared with PET and clay. The influence of contact time and initial concentration on Hg(II) removal efficiency was evaluated by batch technique. Pseudo-second order kinetic model best described the experimental data (0.9985 < R 2