A novel composite, polyaniline-Zr(IV)-iodophosphate (PZIP) was successfully synthesized by simple, suitable, Sol-Gel method and was explored as an adsorbent for the removal of Pb (II) from aqueous solution using batch method. The adsorbent was characterized by advanced sophisticated techniques like FT-IR, TGA-DTA, XRD and SEM. The adsorbent was fairly stable against many chemical reagents like HCl, H2SO4, and NaOH. The optimum condition for the maximum adsorptive removal of Pb (II) ions from aqueous solution was determined as a function of contact time, pH, adsorbent dose, and temperature. The pH and temperature played an important role on the adsorption of Pb (II) ion from aqueous solution. The kinetic data well fitted to pseudo first order and pseudo second order kinetic models. The Langmuir and Freundlich isotherm describes the adsorption behavior. The maximum adsorption capacities obtained from Langmuir and Freundlich models are very close to experimental value (17.91 mgg-1 ). Thermodynamic parameters suggested that the adsorption of Pb (II) onto PZIP was physical, endothermic, and spontaneous in nature and involves the weak forces of attraction. The adsorbent was found very effective in the removal of Pb (II) from aqueous solution it was successfully regenerated and showing 80% of Pb (II) removal after the regenerated in third cycle. Therefore based on the above result it may be concluded that poly aniline Zirconium (IV) iodo phosphate (PZIP) could be a promising adsorbent in treating water contaminated with Pb (II).
