▎ 摘　　要

The environmental impact of chemical processes has now opened new windows of opportunity for bio-based catalysts. In this paper a highly active bio-based catalyst of vitamin B-12 supported on graphene oxide nanosheets is reported for the selective aerobic oxidation of alcohols to the corresponding carbonyl compounds. Operational simplicity, mild reaction conditions, high yield and selectivity, non-hazardous nature, commercial availability and affordability are the main advantages of this novel catalytic system.