Abstract

AbstractIn our research, the magnetic nanocomposite adsorbent Zn Fe3O4/SiO2 MCM-48 was prepared, and the ability of this nanocomposite to remove phosphate and nitrate ions from synthetic wastewater was investigated. Various batch adsorption conditions, including different pH, temperature, contact time, initial phosphate concentration and adsorbent dosage conditions, were considered. Phosphate and nitrate adsorption kinetics were well fitted by the pseudo-second-order kinetic model for all studied adsorbents. The adsorption process was represented by Langmuir isotherms. The thermodynamic parameters ∆G, ∆H and ∆S, which were determined using the Van't Hoff equation, indicated that the phosphate adsorption reactions on the Zn Fe3O4/SiO2 MCM-48 nanocomposite were spontaneous and endothermic in nature. The optimal conditions for the adsorption of phosphate and nitrate ions onto Zn Fe3O4/SiO2 MCM-48 were a pH of 2.0, temperature of 340 K and contact time of 66 min. The results presented here support the potential of using the Zn Fe3O4/SiO2 MCM-48magnetic nanocomposite as a material for the treatment of phosphate and nitrate ions in wastewater.KeywordsAdsorptionMechanismWastewaterElectrostatic attractionMagnetite

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