In this paper, the first bio-nano colloid including manganese oxide nanoparticles and copper nanocomplex
in the presence of Amaranthus spinosus as one unwanted plant was prepared (Mn3O4/CuL
bio-nanocolloid). As-prepared bio nanocolloid was analysed completely by different techniques such as
FT-IR, ICP-AES, SEM, EDX, TEM and elemental analysis to have the size, structure, morphology and
elements in this compound. This bio-nanocolloid showed high catalytic activity towards green oxidation
reactions of alcohols using hydrogen peroxide under solvent free conditions. The longevity, easy
and practical recoverability of the solid catalyst was also confirmed for six times. The natural starting
material for a long-term stability catalyst preparation, using ideal oxidant (H2O2), solventless and easy
work up show the great potential in scalability for actual industries applications