In this work, graphene oxide–manganese ferrite (GO–MnFe2O4) magnetic nanohybrids were synthesized by co–precipitation technique. The adsorption properties of GO–MnFe2O4 for efficient removal of Cd(II) from contaminated water were investigated. The nanohybrids were characterized by using X–ray diffraction, Fourier transform infrared spectroscopy, Brunauer– Emmett–Teller specific surface area (BET), transmission electron microscopy, and vibrating sample magnetometry (VSM). | Journal of Science and Technology 55 (1B) (2017) 109–121 REMOVAL OF Cd(II) FROM WATER BY USING GRAPHENE OXIDE–MnFe2O4 MAGNETIC NANOHYBRIDS Nguyen Huu Hieu1, 2, *, Tran Ba Kiet1, Nguyen Hoan Kiem1, Nguyen Thi My Huyen2 1 Faculty of Chemical Engineering, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam 2 Key Laboratory of Chemical Engineering and Petroleum Processing, HCMUT–VNUHCM 268 Ly Thuong Kiet Street, Ward 14, District 10, Ho Chi Minh City, Vietnam * Email: nhhieubk@ Received: 30 December 2016; Accepted for publication: 3 March 2017 ABSTRACT In this work, graphene oxide–manganese ferrite (GO–MnFe2O4) magnetic nanohybrids were synthesized by co–precipitation technique. The adsorption properties of GO–MnFe2O4 for efficient removal of Cd(II) from contaminated water were investigated. The nanohybrids were characterized by using X–ray diffraction, Fourier transform infrared spectroscopy, Brunauer– Emmett–Teller specific surface area (BET), transmission electron microscopy, and vibrating sample magnetometry (VSM). VSM result showed the high saturation magnetization values Ms = emu/g, the BET specific surface area was m2/g. Adsorption experiments were carried out to evaluate the adsorption capacity of the GO–MnFe2O4 magnetic nanohybrids and compared with MnFe2O4 nanoparticles and GO nanosheets. The equilibrium time for adsorption of Cd(II) onto the nanohybrids was 240 minutes. Experimental adsorption data were well–fitted to the Langmuir isotherm and the pseudo–second–order kinetic equation. The experimental results showed that adsorption of Cd(II) using GO–MnFe2O4 magnetic nanohybrids was better than MnFe2O4 and GO with a maximum adsorption capacity of mg/g at pH 8. Reusability, ease of magnetic separation, high removal capacity, and fast kinetics lead the GO– MnFe2O4 nanohybrids to be promising adsorbents for removal heavy metals from contaminated water. Keywords: cadmium removal, .
