Polyamine-modified magnetic graphene oxide surface: Feasible adsorbent for removal of dyes

Gisya Abdi, Abdolhamid Alizadeh (Coresponding Author), Jhaleh Amirian , Soraya Rezaei, Gaurav Sharma

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


Magnetic nanoparticles were integrated with graphene oxide sheets modified by metformin to introduce poly-amine functionality in structure. Modified magnetic graphene oxide by metformin (MMGO) adsorption ability was studied for removal of methyl violet (MV) and acid red 88 (AR88) at different pH, initial concentration, and contact time. The successful preparation of magnetic nanoparticles supported with modified graphene oxide sheets is evident from FTIR spectra, TGA, zeta-potential and magnetic measurements. Morphology and chemical structure of the prepared MMGO nanocomposite was studied by TEM, SEM, XPS and EDS analyses. Surface area measurement of the MMGO composite revealed high BET surface area of 226 m2 g−1. Equilibrium isotherms were employed to evaluate the experimental data and calculate the isotherms' parameters. Results showed that adsorption process is based on Langmuir isotherm (R2 > 0.99) and adsorption capacity of fabricated nano-composite was found to be 243 mg g−1 for MV and 303 mg g−1 for AR88. Kinetical results were based on pseudo-second order (R2 > 0.99) and physisorption was main process in the rate-controlling step.
Original languageEnglish
Article number111118
Number of pages10
JournalJournal of Molecular Liquids
Publication statusPublished - 1 Sept 2019
Externally publishedYes


  • Magnetic graphene oxide
  • Acid red 88
  • Methyl violet
  • Elovich equation
  • Langmuir isotherm
  • emkin isotherm
  • dsorbent for removal of dyes

Field of Science*

  • 2.7 Environmental engineering
  • 2.4 Chemical engineering
  • 1.4 Chemical sciences
  • 2.10 Nano-technology
  • 2.5 Materials engineering

Publication Type*

  • 1.1. Scientific article indexed in Web of Science and/or Scopus database


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