In this work, we have proposed a method for synthesis of chitosan/Fe3O4/graphene oxide (CS/Fe3O4/GO) nanocomposite and its application for efficient removal of Fe(III) ions from aqueous solutions. For this purpose, first, graphene oxide (GO) was prepared from graphite by Hummer’s method, then, after CS/Fe3O4/GO was synthesized via chemical co-precipitation method from a mixture solution of GO, Fe3+, Fe2+ and chitosan. | Vietnam Journal of Science and Technology 56 (2) (2018) 158-164 DOI: SYNTHESIS AND APPLICATION OF CHITOSAN/GRAPHENE OXIDE/MAGNETITE NANOSTRUCTURED COMPOSITE FOR Fe(III) REMOVAL FROM AQUEOUS SOLUTION Le Dang Truong1, 2, Tran Vinh Hoang1, *, Le Dieu Thu1, Tran Ngoc Quang1, Nguyen Thi Minh Hang2, Nguyen Dang Khoi3, Trinh Xuan Anh1, Tran Le Anh1, 3 1 2 School of Chemical Engineering, HUST, 1 Dai Co Viet, Hanoi Faculty of Environment, Thuyloi University, 175 Tay Son Street, Hanoi 3 Hanoi Amsterdam High School, 1 Hoang Minh Giam Street, Hanoi * Email: Received: 15 August 2017; Accepted for publication: 27 February 2018 Abstract. In this work, we have proposed a method for synthesis of chitosan/Fe3O4/graphene oxide (CS/Fe3O4/GO) nanocomposite and its application for efficient removal of Fe(III) ions from aqueous solutions. For this purpose, first, graphene oxide (GO) was prepared from graphite by Hummer’s method, then, after CS/Fe3O4/GO was synthesized via chemical co-precipitation method from a mixture solution of GO, Fe3+, Fe2+ and chitosan. The synthesized GO and CS/Fe3O4/GO were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM), dynamic light scattering (DLS) and measuring zeta potential techniques. Optimized adsorption conditions for Fe3+ removal such as pH and contact time were investigated. Fe(III) adsorption equilibrium data were fitted well to the Langmuir isotherm and the maximum monolayer capacity (qmax), was calculated as of . In addition, the recoverable and recyclable of CS/Fe3O4/GO nanocomposite has been investigated. Data showed that after 6 adsorption-regeneration cycles, the Fe3+ removal efficiency of CS/Fe3O4/GO was still higher than 60 %. The results indicated CS/Fe3O4/GO nanocomposite can be used as a cheap and efficient adsorbent for removal of heavy metal ions from aqueous solutions. Keywords: .
