Bio-Synthesis, Characterization and Catalytic Potential of Nanoparticles for Dyes Removal

The kinetics of catalytic degradation of methyl violet using biosynthesized silver   nanoparticles was studied spectrophotometrically. The biosynthesis process synthesized the silver nanoparticles using Azadirachta indica leaves extract and characterized by spectral techniques. Uv spectra showed the reduction of silver nitrate into silver nanoparticles. Atomic force microscopy analysis showed the configuration, morphology, and size of silver nanoparticles. It was observed silver nanoparticles are spherical and produced in high percentages. The kinetics of degradation of methyl violet with silver nanoparticles was analyzed by observing the change in absorbance with respect to time at 583nm as a function of pH, concentration of nanoparticle, catalyst, and temperature. The reaction follows pseudo-first-order kinetics depends on the concentration of nanoparticles and is independent of the concentration of methyl violet. The degradation process was found to be more favorable at low temperatures and in the basic medium at pH 11 The activation parameters are also evaluated.