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 r2 > 0.98 and r2 > 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.

Effective and selective removal of aromatic amines from water by Cu2+-treated chitosan/alumina nanocomposite

“…Among these methods, adsorption is considered as a more simple and cost-effective technique for removal of contaminants from water. Various adsorbents such as activated carbon powders and fibers (Chai et al, 2007;Han et al, 2006), carbon nanotubes (Yang et al, 2008), iron oxide magnetite nanoparticles (Bettini et al, 2015b;Kakavandi et al, 2013), montmorillonite (Essington, 1994), Cr-bentonite (Zheng et al, 2009), MCM-41 mesoporous material (Eimer et al, 2003), tetraborate-modified Kaolinite (Unuabonah et al, 2008), sulfonic-functionalized styrene-divinyle benzene copolymer (Jianguo et al, 2005), and methacrylic acid-modified silica gel have been developed to remove aromatic amines from water.…”

Synthesis of Fe3O4-loaded porous carbons developed from rice husk for removal of arsenate from aqueous solution

“…Additionally, the presence of Fe 3 O 4 particles results in the chemical stability and low toxicity of PC, which is essential for widespread utilization of this method for pollutant treatment in groundwater and wastewater (Kakavandi et al 2013). Therefore, a combination between rice husk-based PC (RHC) and Fe 3 O 4 nanoparticles can create a promising adsorbent with high adsorption capacities and easy recovery from the aquatic system.…”

Insights onto the Adsorption of MFe2O4 Nanoparticles Loaded onto Activated Carbon

“…The pseudo-first order kinetic model [26] was given as equation. (3) where q e (mg/g) and q t are the measures of PCP adsorbed onto adsorbent at equilibrium at any time t (min) consequently, k 1 (min -1 ) is the firstorder rate constant at equilibrium.…”