In this study, untreated and chemical treated PET recycled fibers were tested for the retention of Pb(II) and Cu(II) from aqueous media. Batch systems were used experimental as a function of initial concentration of metal ions, to highlight the possible utilization of this low-cost material in the wastewater treatment. Two chemical treatments (with Na2S2O3 and NaOH solutions, 4N) were used for the increase of adsorption capacity of PET fibers. The experimental data were assessed using Langmuir and Freundlich models. The regressions coefficients indicate that Langmuir model is the most appropriate to describe all experimental results. The higher maximum adsorption capacities are obtained in case of PET-NaOH adsorbent, both for Pb(II) and Cu(II) adsorption.