Work Function Based Catalytic Activity of Metallic Nanoparticles for Dye Degradation
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An environmentally benign, simple and mild approach has been adopted for the biogenic fabrication of Ag, Cu and Au MNPs (Metal nanoparticles) using Syzygium cumini leaf extract, at room temperature. This is an aqueous phase synthesis and excludes the use of toxic organic solvents. The TEM images revealed that the as-prepared MNPs possess spherical morphology with an average diameter of 6 nm. Application of these MNPs as nanocatalyst was investigated in decomposition of two organic dyes CR (Congo red) and RB (Rose bengal) in the presence of sodium borohydride (NaBH4), which is otherwise extremely slow. The rate constants of decomposition reactions were determined and found to follow the order—kAg > kCu > > kAu > kuncat, for both the dyes. Difference in the catalytic activity arise from the difference in their work function values. High catalytic activity of Ag NPs, as compared to Cu and Au, is attributed to its least work function value.
KeywordsMetal nanoparticles Congo red Rose bengal Work function Nanocatalysis
The authors are highly thankful to Council of scientific and industrial research (CSIR) and University of Delhi (DU R & D Grant) for financial assistance in the form of research project. We would like to thank USIC, University of Delhi, for allowing us to use various instruments.
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