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Nitrate Adsorption by Synthetic Activated Carbon Magnetic Nanoparticles: Kinetics, Isotherms and Thermodynamic Studies Publisher



Rezaei Kalantary R1 ; Dehghanifard E2 ; Mohsenibandpi A3 ; Rezaei L4 ; Esrafili A1 ; Kakavandi B5 ; Azari A6
Authors

Source: Desalination and Water Treatment Published:2016


Abstract

Abstract: In this study, synthesized Fe3O4 magnetic nanoparticle (MNP) coated on powder activated carbon was applied for the adsorption of nitrate from aqueous solutions. This novel adsorbent was then characterized by Scanning electron microscopy, Transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscope, and N2 adsorption–desorption. Effects of variables such as pH, contact time, initial nitrate concentration, adsorbent concentration, and co-existing anions were all evaluated in detail. The adsorption of nitrate fitted best with the Langmuir isotherm (R2 = 0.993) and pseudo-second-order kinetic models (R2 = 0.998). The equilibrium time and the maximum monolayer capacity (Qo) were determined to be 60 min and 57.1 mg/g, respectively (at pH 3). Thermodynamic studies revealed that the adsorption process of nitrate was spontaneous and endothermic. Moreover, the adsorption of nitrate followed the circumstantial interface in solid/liquid phases. Eventually, the activated carbon-Fe3O4 MNP (AC-Fe3O4 MNP) could be applied as a proper adsorbent for the removal of nitrate from aqueous solutions due to the advantages of high efficiency, rapid separation, and multiple usages. © 2015 Balaban Desalination Publications. All rights reserved.
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