Background: Synthesis of environmental friendly nanogreen catalyst due to their very high efficiencyand recyclability in color removal from dyes intextile wastewaters needs urgent attention as these wastewaters are toxic for the aquatic life and they obstruct the penetration of sunlight.

Methods: Thus, highly stable and homogeneously dispersed amino acid functionalized silver nanoparticles of ≈10nm diameter, λ_max ranging 420 to 430 nm is prepared on AgNO3 solution addition to gum of Azadirachtaindicasolution at 373.15 K. Thisfacile synthesis is in aqueous phase, without involvement of any toxic chemicals making it a green approach. The amino acids were selected based on their polarity. The synthesized nanoparticles were characterized by UV-Vis, FTIR spectroscopy, HR-TEM, XRD and SEM, while the 1H-NMR confirmed functionalization of silver nanoparticles (ANP) by the amino acids. The functionalized nanoparticles were used as catalyst for the reduction of methylene blue dye in presence of Sn(II) in aqueous, anionic and cationic micellar media.

Results: The rate of reduction of dyewas determined by measuringthe decrease in absorbance of the dye at 660 nm, spectrophotometrically. The rate of reduction follows Kcationic>Kanionic>Kwaterorder and the polarity and -R group of amino acids played a major role for showing this catalytic activity. After 12 min and in absence of the ANP, only 2%, 3% and 6% of the dye reduction was completed in aqueous, anionic and cationic micellar mediarespectively while, in presence of ANP functionalized by polar neutral amino acid with non-polar -R group, the reduction completed to 84%, 95% and 98% respectively.

Short Conclusions: The ANP functionalized with polar neutral amino acid having non-polar -R group, increased the rate of reduction of the dye by 94, 3205 and 6370 folds in aqueous, anionic and cationic micellar media respectively. Also, the rate of reduction of the dye increased by three folds when the micellar media was changed from anionic to cationic when the ANPis functionalized by a polar neutral amino acid having a non-polar -R group. The antimicrobial assay of these functionalized ANPʼs is under study. The detailed results will be discussed in the presentation.

Biography:
The author is currently doing his Ph.D. in chemistry from Central University of Gujarat, India, on synthesis of metal nanoparticles and their application as biosensors, catalyst & antimicrobial agents. He completed his graduation & post-graduation from University of Delhi and his research area of interest is nanoparticles & interactions involving biomolecules and surfactants. He has published research works based on these in reputed journals like “JCT (Elsevier) and JCED (ACS)”. He has presented his works at international conferences, one of them sponsored by RSC and was selected to attend UGC sponsored Winter School on Computational Chemistry at University of Hyderabad.