GREEN-SYNTHESIZED AG - NI BIMETALLIC NANOPARTICLES FROM Mimosa Pudica LEAF EXTRACT ACHIEVE HIGHLY EFFICIENT PHOTOCATALYTIC DEGRADATION OF CATIONIC TRIARYLMETHANE AND THIAZINE DYES
Uncontrolled discharge of synthetic cationic dyes from textile and dyeing industries poses serious environmental and health risks, demanding sustainable treatment methods. Here, silver–nickel bimetallic nanoparticles (Ag–Ni BMNPs) were green-synthesised using Mimosa pudica leaf extract and characterised by UV–Vis, FTIR, XRD, andSEM–EDX. UV–Vis confirmed nanoparticle formation via a localised surface plasmon resonance band at 421nm; FTIR identified hydroxyl-, amine-, and carbonyl-containing phytochemicals responsible for stabilisation; XRDrevealed a face-centred cubic Ag-rich structure (~31 nm crystallite size); and SEM–EDX confirmed predominantlyspherical particles (13–58 nm) with uniform Ag/Ni distribution. Photocatalytic testing against Crystal Violet (CV), Malachite Green (MG), and Methylene Blue (MB) gave degradation efficiencies of 95.2%, 88.4%, and 48.9%, respectively, attributed to efficient Ag–Ni interfacial charge separation and reactive oxygen species generation. These results establish M. pudica-mediated Ag–Ni BMNPs as an efficient, low-cost, eco-friendly photocatalyst for dye-contaminated wastewater treatment. By converting a common, non-food plant into a low-cost photocatalyst that removes textile dye pollutants from water, this work contributes directly to SDG 6: Clean Water and Sanitation
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