Polymer-Based Nano-Adsorbent for the Removal of Lead Ions: Kinetics Studies and Optimization by Response Surface Methodology

This work successfully created a polypyrrole-polyethyleneimine (PPy-PEI) nano adsorbent for the elimination of lead ion Pb2+ from an aqueous solution. An efficient conducting polymer-based called as was using ammonium persulfate (NH4)2S2O8 oxidant (PPy-PEI). The PEI hyper-branched polymer with terminal amino groups added to PPy offer heavy metals more effective chelating sites. removal solution polyethyleneimine micro accomplished batch equilibrium technique generated water-insoluble nanoadsorbent had enough nitrogen atoms; therefore, effort made link PEI, water-soluble PPy, conjugated polymer, adsorption PPy-PEI nanoadsorbents were discovered have average particle sizes 18–34 nm and Brunauer-Emmet-Teller surface area 17 m2/g, respectively. thermal behavior composites investigated thermo gravimetric differential scanning calorimetric methods. efficacy pure polypyrrole found be 38%; however, employing revealed maximum capacity 75.60 mg g?1. At pH 10 30 min contact time at 50 °C, 0.2 g shown ideal dosage. X-ray diffraction analysis, energy-dispersive ray spectroscopy, Fourier transform infrared spectrum support by nanoadsorbents. cauli-like structure visible field emission electron microscopy. Studying thermodynamic showed that endothermic illustrated positive value ?H° is 1.439 kJ/mol which indicates uptake onto could attributed physical process. According values ?G°, process spontaneous all selected temperatures. ?S° (43.52 j/mol) suggested increase in randomness solid/solution interface during data meet pseudo-second-order kinetic model suited Langumuir isothermal effectively.