Abstract
A new threonine doped polypyrrole (Thr-PPy) was prepared via in situ polymerization of pyrrole with threonine for the removal of Cr (VI) from aqueous solutions. The prepared Thr-PPy was characterized using FT-IR, SEM with EDS, XRD, XPS and BET methods. The adsorption experiments were carried out in batch mode to optimize various parameters like contact time, initial concentration, pH, adsorbent dose, coexisting ions and temperature that influence the adsorption rate. Langmuir, Freundlich, Dubinin-Radushkevich and Temkin adsorption isotherm models were applied to describe isotherm constants. Equilibrium data obeyed well with the Langmuir isotherm model with maximum adsorption capacity of 185.5mg/g. Thermodynamic studies revealed that the nature of adsorption is spontaneous and endothermic. The results of the kinetic experiments show that Cr (VI) adsorption on Thr-PPy follow pseudo-second-order and intra-particle diffusion models. The mechanism of Cr (VI) adsorption by Thr-PPy was governed by the ionic interaction between NH3+ of Thr and HCrO4− ions. Thr-PPy can be reused successfully for the removal of Cr (VI) four times without loss of its removal efficiency.
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