Removal of Reactive Red195 Synthetic Textile Dye using Polypyrrole-coated Magnetic Nanoparticles as an Efficient Adsorbent

Magnetic Fe3O4 nanoparticles modified by polypyrrole (PPy@Fe3O4 MNPs) was synthesized by chemical co-precipitation method and used as an adsorbent for removal of cationic dyes, Reactive Red195, from aqueous solutions. The resulting products are characterized by scanning electron microscope (SEM) and FT-IR. The effects of solution pH value, adsorbent amount, adsorption time and capacity of the nanocomposites have been fully investigated. The particles were showed to capture 99.0 mg g-1 of the dye within less than 10 min of contact time. Also, the sorption of Reactive Red195 dye was pH dependent and the higher efficiency of dye concentration removal was at pH 3.0. Experiments were carried out to investigate adsorption kinetics, adsorption isotherms and adsorption capacity. Kinetic data were well fitted by a pseudo second-order model. In the aqueous solution of Reactive Red195 dye at 25 °C, the adsorption data could be fitted by the Langmuir equation with a maximum adsorption amount of 99.0 mg g-1. Moreover, the MNPs were recovered with over than 94% efficiency using methanol as elution agent.