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The Efficient Adsorption Removal of Cu(II) by Using Fe3O4/TiO2/Graphene Ternary Nanocomposites

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A novel magnetic Fe3O4/TiO2/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 N2 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 Ea was 17.32 kJ · mol-1 for 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.
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Keywords: Cu(II) Adsorption; Exothermic Process; Fe3O4/TiO2/Graphene; Recyclable; Ternary Nanocomposites

Document Type: Research Article

Affiliations: 1: Department of Chemistry and Chemical Engineering, Jining University, Qufu 273155, P. R. China 2: State Key Laboratory Base of Eco-Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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