Removal of cobalt ions from aqueous solution by an amination graphene oxide nanocomposite.

Highlights: [•] A newly designed GO-NH2: Higher adsorption capability than that of activated carbon. [•] Very quick adsorption property: More than 90% of Co(II) can be removed within 5min. [•] One of the highest adsorption capabilities of today's nanomaterials for Co(II) (116.35mg/g). [•] GO-NH2 membrane can remove more than 98% Co(II) from the water. [Copyright &y& Elsevier]