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In the present investigation,we report a new one phase, one pot method for synthesis of 3.5 ± 0.7 nmaverage sized gelatin capped gold nano particles (Gel-AuNPs) using strong reductant NaBH4in aqueous system at room temperature. Size controlled Gel-AuNPs were characterized by UV-Visible, STEM, XRD, DLS and FT-IR. Spherical Gel-AuNPs showedexcellent catalytic activity for reduction of three differentlycharged dyes eosin B (EB),methylene blue (MB) and rose bengal (RB) in the presence of NaBH4. The study revealed that 100% reduction of EB, MB and RB dyes wascarried out in just150 sec. The developed catalyst was easy to recover and capable to be reused three times. The process of reduction rate and kinetics of dyes wasmonitored using UV-Visible spectrophotometer. A plot of lnC Vs time (sec) showedthat reaction followsthe first order kinetics. Rate constant (K) was determined for EB, MB and RB reduction at 10μM, which was found as 2.735 x10-2sec-1, 2.738 x 10-2sec-1and 2.55 x 10-2sec-1, respectively. The study revealed that catalytic reduction of dyes by Gel-AuNPs in aqueous medium is environmentalfriendly in terms of recovery of catalyst, is exceptionally fast and hence extremely economical.
Zulfiqar A. Tagar, Sirajuddin1,Najma Memon, Muhammad S. Kalhoro, Nazar H. Kalwar, Yasmeen Junejo, Syeda Sara Hassan. (2012) Facile Synthesis, Characterization and Catalytic Function of Gelatin Stabilized Gold Nanoparticles, Pakistan Journal of Analytical & Environmental Chemistry, Volume 13, Issue 1.
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