Preparation of magnetic triethylene tetramine-graphene oxide ternary nanocomposite and application for Cr (VI) removal

摘要

A novel magnetic composite of CoFe2O4-Triethylene tetramine-Graphene oxide (CoFe2O4-TETA-GO) was firstly synthesized by hot reflux and hydrothermal method in this work, making separation of the adsorbents easy in the foreign magnetic field. And they were utilized to remove Cr (VI) from aqueous solution effectively. The prepared CoFe2O4-TETA-GO was characterized by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Fourier Transforms Infrared Spectroscopy (FTIR), X-Ray Diffractions (XRD) and X-ray Photoelectron Spectrum (XPS). The characterization results showed that CoFe2O4-TETA-GO were modified by magnetic nanoparticles CoFe2O4 and TETA, existing the excellent separation characteristic. The influence of factors such as initial pH value in solution and contact time on the adsorption performance of Cr (VI) onto CoFe2O4-TETA-GO was studied. The adsorption kinetics fit pseudo second-order model and the equilibrium adsorption were well described with Langmuir model. The saturated adsorption capacity of Cr (VI) was about 180.12 mg/g on the CoFe2O4-TETA-GO at pH = 2. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.