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Omid Moradi,Vinod Kumar Gupta,Shilpi Agarwal,Inderjeet Tyagi,Mohammad Asif,Abdel Salam Hamdy Makhlouf,Hamidreza Sadegh,Ramin Shahryari-ghoshekandi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-
Graphene (G) and Graphene oxide (GO) were employed in the present study for the removal of two toxiccationic dye Basic Red 12 (BR 12) and Basic Red 46 (BR 46), from aqueous solutions. Graphene oxide wassynthesized by Hummer–Offeman method, and then characterized by XRD (X-ray diffraction), and FT-IR(Fourier Transform Infrared spectroscopy). The influence of various physico-chemical parameters suchas electrical conductivity behaviors, contact time, solution pH, dye concentration and temperature werewell investigated and elucidated. The kinetics and thermodynamics of the toxic dye removal processwere also investigated; results clearly depicts that the kinetics of the removal of BR 12 and BR 46 using Gand GO as adsorbents follows a pseudo-second-order model. G and GO exhibited high-adsorptioncapacity for BR 12 and BR 46. The dye removal depends on the initial pH of the solution with themaximum uptake occurring at about pH 9. Moreover, the thermodynamic results confirmed thatadsorption of dye BR 46 on G and GO were exothermic and adsorption of dye BR 12 on G and GO wereendothermic in nature. The electrical conductivity behaviors of the aqueous solution were found to beenhanced by oxidation of graphene.