▎ 摘　　要

NOVELTY - A graphene derivative comprising at least one graphene layer, is new, where the graphene layer is functionalized with a covalently bound polyglycerol compound comprising a polyglycerol backbone and at least one substituent in the nature of a covalently bound sulfate group. USE - The graphene derivative is useful for binding viruses in vitro, and as a medicament against viral diseases, as filtration system for filtrating viruses in vitro, as diagnostic tool for the detection of viruses, as medical device against viruses in vitro or in vivo (all claimed), as superabsorber in masks (preferably breathing masks) and as filter material for decontaminating liquids e.g. water, preferably sewage water. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the graphene derivative.