Open AccessGreen synthesis of graphene oxide‐MnFe 2 O 4 composites and their application in removing heavy metal ions
Author(s) -
Liao Fangli,
Diao Guiqiang,
Li Hao
Publication year - 2020
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2018.5640
Subject(s) - graphene , materials science , langmuir adsorption model , adsorption , aqueous solution , oxide , raman spectroscopy , composite material , fourier transform infrared spectroscopy , endothermic process , x ray photoelectron spectroscopy , metal ions in aqueous solution , chemical engineering , metal , nanotechnology , chemistry , metallurgy , physics , engineering , optics
The composites of graphene oxide (GO) decorated by MnFe 2 O 4 have been synthesised via a green and facile strategy that the pristine GO/MnSO 4 suspension prepared by Hummers method was directly utilised to convert into the GO‐MnFe 2 O 4 composites. The as‐prepared composites were characterised using X‐ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, Raman spectra and X‐ray photoelectron spectroscopy. The results indicated that the GO‐MnFe 2 O 4 composites were successfully synthesised. The removal behaviours of Pb 2+ and Cu 2+ onto GO‐MnFe 2 O 4 were investigated, which indicated that the composites exhibited great adsorption property in aqueous solution. The adsorption process could be fitted well by the pseudo‐second‐order model and Langmuir isotherm. The thermodynamic studies indicated that the adsorption process of Pb 2+ and Cu 2+ onto GO‐MnFe 2 O 4 composites was spontaneous and endothermic in nature. Furthermore, the maximum adsorption capacities for Pb 2+ and Cu 2+ calculated from Langmuir model were about 263.85 and 103.41 mg/g at 318 K, respectively. Based on the results from the reusability experiments, the as‐prepared GO‐MnFe 2 O 4 composites could be used as a potential adsorbent for removing Pb 2+ and Cu 2+ ions from aqueous solutions.