Fatemeh Sabermahani; Mohammad Daneshpazhooh
Abstract
Heavy metal pollution, particularly lead (Pb2+), poses a significant threat to the environment and human health. In this study, Fe3O4/rice husk/ polypyrrole (Fe3O4/Rh/PPy) nanocomposite was synthesized and used for removal of lead from aqueous solutions. In the first, Fe3O4 magnetic nanoparticle was ...
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Heavy metal pollution, particularly lead (Pb2+), poses a significant threat to the environment and human health. In this study, Fe3O4/rice husk/ polypyrrole (Fe3O4/Rh/PPy) nanocomposite was synthesized and used for removal of lead from aqueous solutions. In the first, Fe3O4 magnetic nanoparticle was prepared through a simple and one step method and then polypyrrole (PPy) was synthesised chemically on the surface of nanoparticle. FeCl3 was used as chemical oxidants for oxidation of pyrrole to PPy. The new nanocomposite was characterized by FT-IR, SEM and Dynamic Light Scattering method. The effect of pH, contact time, adsorbent dose, initial concentration, ionic strength and the effect of temperature on the adsorption was checked out in a batch process. Optimal adsorption conditions were determined at pH~ 7, 0.04 g dosage, 45 min contact time, and 30 ppm initiallead concentration, yielding a maximum lead removal efficiency of 99.7 %. Using the equilibrium constants obtained at different temperatures, the thermodynamic parameters were calculated and showed that the uptake of lead is spontaneous and exothermic. The maximum adsorption capacity by using Langmuir equation was calculated 85.47 mg/g. The kinetic data followed by Pseudo second.
