Synthesis of Iron-containing Nanoparticles from Iron-Steel Industrial Waste for Adsorption of Malachite Green

Authors : Deniz UZUNOGLU, Ayla OZER

Pages : 6-18

Doi:10.55549/epstem.1175888

View : 50 | Download : 7

Publication Date : 2022-09-16

Article Type : Research Paper

Abstract :For the synthesis of iron-containing nanoparticles insert ignore into journalissuearticles values(FeNPs);, the iron ions were recovered from iron-steel industrial waste by leaching method followed by the chemical precipitation of ferric hydroxide with NH3. The ferric hydroxide was reduced pyrometallurgical to iron-containing nanoparticles by the reducing agent of CO generated from charcoal. FeNPs were characterized by XRD and SEM analysis. XRD results showed that FeNPs had predominantly face-centered cubic Fe3O4 structure, besides, the peaks of Fe2O3 and Fe0 structures were also observed. The particle size of FeNPs was calculated as 57.75 nm using Williamson–Hall equation. According to SEM images, FeNPs had homogeneous and spherical-like structures; also, the structures partially decomposed and the particle size increased due to the agglomeration of the particles after adsorption. FeNPs were used as an adsorbent for the removal of Malachite Green insert ignore into journalissuearticles values(MG);. The experimental design and the optimization of experimental conditions were investigated by using response surface methodology insert ignore into journalissuearticles values(RSM); according to central composite design insert ignore into journalissuearticles values(CCD);. The optimum experimental conditions were determined as 180 min contact time, 75 °C temperature, and 300 mg/L initial MG concentration. The agreement between the adsorbed MG concentrations at the equilibrium insert ignore into journalissuearticles values(qe); calculated from the model insert ignore into journalissuearticles values(148.43 mg/g); and determined experimentally insert ignore into journalissuearticles values(146.63 mg/g); under the optimum conditions showed that the selected model was suitable for MG adsorption by FeNPs. Langmuir isotherm model had higher R2 and lower ARE values than Freundlich isotherm model, showing that the equilibrium data of MG adsorption with FeNPs was the best agreement to Langmuir isotherm model with the maximum monolayer coverage capacity of 175.44 mg dye/g FeNPs. The thermodynamic studies suggested that the adsorption process was endothermic, spontaneous at the optimum conditions, and the positive ΔS value indicated the increased disorder at the solid-solution interface during the adsorption.
Keywords : Iron containing nanoparticles, Pyrometallurgical nanoparticle synthesis, Response surface methodology, Adsorption, Malachite Green

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