Kinetic and thermodynamic study of 1-naphthol adsorption from aqueous solution to sulfonated graphene nanosheets (vol 173, pg 185, 2011)

The sulfonated graphene nanosheets were prepared from graphene oxides. The kinetic and thermodynamicadsorption of 1-naphthol from aqueous solution on the sulfonated graphene nanosheets wereinvestigated under ambient conditions. The results of 1-naphthol kinetic adsorption on sulfonatedgraphene indicated that the adsorption was inclined to stack on the surface of graphene nanosheetswith low activation energy. The thermodynamic parameters calculated from the temperature dependentadsorption isotherms indicated that the adsorption was a spontaneous and endothermic process,and the adsorption was in good agreement with the theory of non-bonding interaction intensity. Theadsorption capacities of 1-naphthol on sulfonated graphene nanosheets are∼2.3 mmol/g at 293.15 K, and ∼6.4 mmol/g at 313.15 and 333.15 K, which are the highest adsorption capacity of todays’ nanomaterials.The results suggest that the sulfonated graphene nanosheets may be a promising suitablecandidate for the preconcentration of 1-naphthol from large volume of aqueous solutions in real work innear future.