title: Synthesis and properties of Fe3O4-activated carbon magnetic nanoparticles for removal of aniline from aqueous solution: equilibrium, kinetic and thermodynamic studies.
abstract: In this study, powder activated carbon (PAC) and magnetic nanoparticles of iron (III) oxide were used for synthesis of Fe3O4-activated carbon magnetic nanoparticles (AC-Fe3O4 MNPs) as an adsorbent for the removal of aniline. The characteristics of adsorbent were evaluated by SEM, TEM, XRD and BET. Also, the impact of different parameters such as pH, contact time, adsorbent dosage, aniline initials concentration and solution temperature were studied. The experimental data investigated by Langmuir and Freundlich adsorption isotherms and two models kinetically of pseudo first-order and pseudo second-order. The results indicated that the adsorption followed Langmuir and pseudo second-order models with correlation r(2) > 0.98 and r(2) > 0.99, respectively. The equilibrium time was obtained after 5 h. According to Langmuir model, the maximum adsorption capacity was 90.91 mg/g at pH = 6, and 20°C. The thermodynamic parameters indicated that adsorption of aniline on magnetic activated carbon was exothermic and spontaneous. This synthesized AC-Fe3O4 MNPs due to have advantages such as easy and rapid separation from solution could be applied as an adsorbent effective for removal of pollutants such as aniline from water and wastewater.
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors: Babak
authors: B
authors: Kakavandi
authors: Faculty of Medical sciences, Faculty of Medical sciences, Tarbiat Modares University, Tehran, Iran.
authors: Ahmad
authors: A
authors: Jonidi
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ; Center for Water Quality Research (CWOR), Intitute for Environmental Research (IER), Tehran, University of Medical Sciences, Tehran, Iran.
authors: Roshanak
authors: R
authors: Rezaei
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran ; Center for Water Quality Research (CWOR), Intitute for Environmental Research (IER), Tehran, University of Medical Sciences, Tehran, Iran.
authors: Simin
authors: S
authors: Nasseri
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors: Ahmad
authors: A
authors: Ameri
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors: Ali
authors: A
authors: Esrafily
keywords: Adsorption; Aniline; Fe3O4-activated carbon magnetic nanoparticles; Kinetics; Thermodynamic