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In this contribution, we demonstrate the synthesis of gold nanoparticles (AuNPs) using an entirely green chemistry process. Justicia adhatoda leaf extract used as a bioreductant for the synthesis of AuNPs and its particle sizes are controlled by altering the concentration of metal salt. The optical and morphological properties were studied. We report on the synthesis of stable spherical, well-dispersed colloidal AuNPs (27.1, 33.3 and 46.8 nm) by efficient reducing agents with its mechanisms. The X-ray diffraction analysis also confirmed the obtained sizes of AuNPs with its crystallite size (20.2, 40.1 and 40.3 nm). Catalytic activity of fabricated AuNPs are also examined on the degradation of organic dyes.

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