Spherical silica particles decorated with graphene oxide nanosheets as a new sorbent in inorganic trace analysis.

Highlights: [•] Graphene oxide (GO) covalently bonded to the spherical silica. [•] Very stable sorbent for SPE of metal ions. [•] Excellent contact with solution due to the softness and flexibility of GO nanosheets. [•] Several adsorption–elution cycles without any loss of adsorptive properties. [•] High adsorption capacity due to the wrinkled structure of GO nanosheets. [Copyright &y& Elsevier]