Adsorption of methylene blue in water by reduced graphene oxide: Effect of functional groups
Here we prepared three reduced graphene oxides-hydrazine and H2/Ar reduced graphene oxide at 200 and 500 °C (RGO-N, RGO-H-200 and RGO-H-500) with almost identical Brunauer–Emmett–Teller (BET) surface areas to study the effect of functional groups on adsorption behaviors for the removal of methylene blue (MB) from aqueous solution. The maximum adsorption capacities of RGO-N, RGO-H-200 and RGO-H-500 for MB were 159, 91 and 81 mg/g at 283 K, respectively. X-ray photoelectron spectra measurements demonstrated that the content of relevant functional groups in three adsorbents differs from each other. The C=O or C=N double bonds are able to couple with the C–C/C=C bonds to form a large conjugate structure, enhancing the interactions between RGO and MB molecules. While, the C=OH bonds contribute little, if any, to the increase of adsorption efficiency because of the steric hindrance towards benzene-ring containing dye molecules.
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Document Type: Research Article
Publication date: December 1, 2013
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