Water pollution stemming from various sources, including organic dyes, pesticides, and organic compounds, remains a pressing global concern. In this study, a green one-step synthesis method using Paramignya trimera’s extract as reducing and stabilizing agent was successfully applied to synthesizegold nanoparticles (AuNPs) for the effective degradation of organic dyes. The AuNPs exhibit a spherical shape, ranging from 18 to 24 nm, and are uniformly distributed as observed through TEM and SEM measurements. The exceptional stability of the AuNPs suspension is attributed to the electrostatic attraction mechanism, as indicated by the high zeta potential of -23.8 mV, and the protective role played by the organic layer surrounding the AuNPs. The research results regarding the catalytic capabilities of the material reveal that AuNPs effectively serve as catalysts for the reduction of two organic dyes, methylene blue (MB) and bromocresol green (BG), forming their respective complex compounds. The corresponding rate constants for these reactions are determined as follows: k = 0.0152 s-1for MB and k = 0.0056 s-1for BG, while the activation energies of these reactions are found to be -14.62 kJ/mol for BG, and -16.05 kJ/mol.
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