Removal of Pb2+ and Cu2+ from their aqueous solutions by functionalized polyamide 6.6 yarns with n-allyliminodiacetic acid

The removal of copper (Cu 2+ ), and lead (Pb 2+ ) ions from aqueous solutions with the functionalized Polyamide 6.6 Yarns with N-Allyliminodiacetic Acid to 20% (PA6.6-ALD-20%) chelating ion exchange fiber is described at different conditions. The removal of the above mentioned heavy metal ions from aqueous solutions was studied by batch method. The effects of initial metal concentration, contact time and pH on the removal of Cu 2+ and Pb 2+ ions were investigated. The percentage adsorption of Cu 2+ and Pb 2+ ions increased with an increase in contact time. The binding process was strongly affected by pH and the optimum pH for Cu 2+ and Pb 2+ ions were 5.0 and 6.0, respectively. The kinetic data was evaluated with the pseudo-first order and pseudo-second order models. Kinetic data correlated well with the pseudo-second-order kinetic model, indicating that the chemical adsorption was the rate-limiting step. The adsorption parameters were determined based on Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the adsorbent for Cu 2+ and Pb 2+ ions was calculated from the Langmuir isotherm and found to be 6.17 and 8.06 mg/g, respectively. Actually the percentage of removing Cu 2+ and Pb 2+ ions reached maximum to 55% and 78%, respectively.