In this paper, graphene oxide (GO) was prepared from graphite and used as an adsorbent to remove cationic dyes from single and binary systems of colored wastewater. The GO was prepared by Hummer method and characterized using Fourier transform infrared, scanning electron microscopy, and X-ray diffraction. Basic blue 41 (BB41), basic red 18 (BR18), and basic red 46 (BR46) were used as model dyes. It was found that the adsorption of dyes on GO followed the Langmuir isotherm and the pseudo-second-order kinetics. The capacity of GO to remove BB41, BR18, and BR46 was 1429, 1250, and 476 mg/g, respectively. The results show that the GO has a good capacity for dye adsorption from single and binary systems of colored wastewater containing cationic dyes.
Amine functionalized graphene oxide (AF-GO) nanosheet was prepared and used to remove anionic dyes from multicomponent (binary) systems. The AF-GO was characterized by FTIR and SEM. Acid Blue 92 (AB92), Acid Red 14 (AR14), and Direct Green 6 (DG6) were used as anionic dyes. The dye adsorption kinetics and isotherm followed the pseudosecond order and Langmuir model, respectively. Adsorption capacity of AF-GO for AB92, AR14 and DG6 was 60, 64 and 65 mg/g, respectively. The results showed that AF-GO nanosheet was a suitable adsorbent for removal of anionic dyes.
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