Abstract This article describes a new approach for synthesis of silver nanostructured particles by
using a Sacha inchi shell biomass (SISB). Sacha inchi shell biomass should be considered as an
important source of phytochemicals for the synthesis and stabilization of silver nanoparticles
(AgNPs). The characterization of AgNPs was performed by UV–vis spectroscopy, Transmission
Electron Microscopy and Selected Area Electron Diffraction, indicating that AgNps were synthesized
successfully with an average size of 7.2 nm. Infrared spectrum measurements were carried out
to hypothesize the possible biomolecules responsible for stabilization and capping of the silver
nanoparticles. Then, AgNps were used as a catalyst in the presence of sunlight for the removal
of methyl orange dye (MO, anionic dye) from aqueous solution. The results implied AgNps to
be effective photocatalyst for the decomposition of MO (60%, pH 2.0) from aqueous solution.