The efficient adsorption removal of Cu(II) by using Fe<inf>3</inf>O<inf>4</inf>/TiO<inf>2</inf>/graphene ternary nanocomposites

Key Words:Adsorption;Adsorbents - Adsorption isotherms - Chemicals removal (water treatment) - Crystal structure - Dyes - Heavy metals - Isotherms - Metal ions - Metals - Nanocomposites - Recycling - Scanning electron microscopy - Solutions - Specific surface area - X ray diffraction;Adsorption desorption isotherms - Adsorption kinetics and isotherm - Cu adsorption - Exothermic process - Langmuir isotherm models - Pseudo second order kinetics - Recyclable - Ternary nanocomposites
Abstract:A novel magnetic Fe<inf>3</inf>O<inf>4</inf>/TiO<inf>2</inf>/Graphene (FTG) ternary composite, which possessed highly specific surface area, surface activities and adsorptive performance, was synthesized and used as adsorbent for Cu(II) adsorption removal from in aqueous solution. The crystal structure, morphology and special surface area of FTG nanocomposite were characterized by X-ray diffraction, scanning electron microscopy, and N<inf>2</inf>adsorption-desorption isotherm. The surface morphology and properties of FTG were modified significantly. The specific surface area of FTG was 422.84 m2· g-1, which led to the excellent adsorption capacity for Cu(II) (87.4 mg ·g-1). The adsorption kinetics and isotherm study showed that the pseudo-second-order kinetic and Langmuir isotherm model could well fit the adsorption data. There were three steps in the adsorption process, such as the instantaneous adsorption step, the intraparticle diffusion and the final equilibrium stage. The reaction rate decreased along with temperature increasing, which indicated the adsorption for Cu(II) was an exothermic process. The E<inf>a</inf>was 17.32 kJ ·mol-1for FTG, which illustrated the adsorption of Cu(II) onto the surface of ternary nanocomposite was a physical process. After recycling five times, the decline of adsorption capacity of FTG for Cu(II) was 7.4%, which indicated that the adsorbents could be recycled in the removal of Cu(II). It was proved that FTG nanocomposite might be used as excellent adsorbent to remove heavy metal ions in wastewater. Copyright © 2017 American Scientific Publishers All rights reserved.
Volume:17
Issue:8
Translation or Not:no

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