4.5 Article

Enhanced adsorption behavior of amended EDTA-graphene oxide for methylene blue and heavy metal ions

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SPRINGER
DOI: 10.1007/s13762-019-02286-7

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Graphene oxide; Surface functionalization; Dye removal; EDTA; Methylene blue

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  1. Tabriz branch Islamic Azad University

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Here, edetic acid (EDTA) structure was chemically modified by aspartic acid and lysine (two alpha -amino acids) over covalent functionalization. The obtained modified EDTA (m-EDTA) was used to functionalize graphene oxide (GO) surface for effective removal of dyes from waste waters. The methylene blue dye was adsorbed on the hybrid sorbent through -pi interactions with GO conjugated surface and also electrostatic interactions with multivalent chelating m-EDTA sites. The synthesized hybrid sorbent has been characterized with X-ray powder diffraction, scanning electron microscope, Fourier transform infrared spectroscopy, and ultraviolet-visible spectroscopy. 0.03 g of synthesized hybrid sorbent has been used for treatment of 30 mL of pollutant (1 g/L). The results indicate high removal efficiency was obtained in first 20 min that verify the modification of the GO has a positive effect on removal efficiency.Graphical abstract

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