In this research, graphene oxide (GO) was synthesized via modified Hummers’ method and for the preparation of Fe3O4/GO nanocomposites by impregnation method. Characterization of the nanocomposites was performed by X–ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscope, specific surface area, and vibrating sample magnetometer. | SCIENCE & TECHNOLOGY DEVELOPMENT, Vol 19, 2016 Fabrication, characterization, and adsorption capacity of Fe3O4/graphene oxide nanocomposites for nickel removal Nguyen Huu Hieu Hoang Minh Nam Phan Thi Hoai Diem Ho Chi Minh city University of Technology, VNU-HCM (Manuscript Received on July, 2016, Manuscript Revised on September, 2016) ABSTRACT In this research, graphene oxide (GO) was synthesized via modified Hummers’ method and concentration of Ni (II) ion in solutions was determined using UV-Visible spectrophoto- for Fe3O4/GO meter. The adsorption capacity for Ni (II) nanocomposites by impregnation method. Characterization of the nanocomposites was the preparation of removal was examined with respect to pH effect, kinetic data and equilibrium isotherms in batch performed by X–ray diffraction, Fourier transform infrared spectroscopy, transmission experiments. The maximum adsorption capacity of the Fe3O4/GO estimated with the Langmuir- electron microscope, specific surface area, and vibrating sample magnetometer. The isotherm model for Ni (II) was mg/g at room temperature. Keywords: Fe3O4, graphene oxide, nanocomposite, adsorption, nickel. 1. INTRODUCTION Graphene (GE) is a two dimensional material that has between one and ten layers of sp2-hybridized carbon atoms arranged in sixmembered rings. The length of bonds of GE is Å [1]. Single layer GE nanosheet was first graphite oxidation, is often used to make GE. GO refers to GE with oxygen-containing functional groups as epoxy (C-O-C), hydroxyl (OH), carbonyl (C-O) groups on basal planes and carboxyl (COOH) groups on edges [3]. Therefore, it can be easily exfoliated and obtained by mechanical exfoliation (“Scotch- functionalized to form homogeneous suspensions tape” method) of bulk graphite [2]. Besides, GE sheets have also been fabricated by other in both water and organic solvents. The existence of oxygen functional groups and aromatic sp2 methods such as metal ion
