Abstract: This article outlines the preparation of manganese-doped copper nanoparticles (Mn + Cu
NPs) using Vinca rosea (L.) leaf extract as a convenient and environmentally friendly substance.
UV–vis, FT–IR, XRD, SEM–EDAX, and DLS instrumental techniques were employed to describe
the physical and chemical properties of synthesized V. rosea extract-mediated Vr-Mn + Cu NPs.
The synthesized Vr-Mn + Cu NPs were observed to be monodispersed and spherical, with an average
size of 412 nm. The plant extract includes a variety of phytochemical components. The Vr-Mn + Cu
NPs also have potential antioxidant and antibacterial properties against selected pathogens. The green
synthesized Vr-Mn + Cu NPs showed a maximum inhibition zone of 16.33 0.57 mm against E. coli.
For dye degradation, MR, EBT, and MO showed the highest degradation percentage capabilities
with Vr-Mn + Cu NP-based adsorbents, which were determined to be 78.54 0.16, 87.67 0.06,
and 69.79 0.36. The results clearly show that biosynthesized Vr-Mn + Cu NPs may be employed as
an antioxidant, antibacterial, photocatalytic dye degradation, and catalytic agent, as well as being
ecologically benign.