Efficient Amphiphilic Poly(propyleneimine) Dendrimer Stabilized Gold Nanoparticle Catalysts for Aqueous Phase Reduction of Nitrobenzene
A well balanced amphiphilic poly(propyleneimine) dendrimer (APPI-G2) was synthesized and used as an effective template for the stabilization of gold nanoparticle (AuNPs). The APPI-G2 served as a stabilizing as well as reducing agent for AuNPs. The APPI-G2 stabilized AuNPs (APPI-G2-AuNPs) were characterized by UV-visible spectroscopy (UV-Vis) and transmission electron microscopy (TEM). The size of the AuNPs was in the range of 7 to 16 nm and their growth during the synthesis showed splitting of surface plasmon resonance band. Further, APPI-G2-AuNPs were also prepared by varying the APPI-G2 concentration keeping [Au3+] constant and vice-versa to examine the stabilization efficiency of APPI-G2. The APPI-G2 stabilized more than 5 × 10–6 M of AuNPs. The prepared catalysts were found to exhibit enhanced catalytic activity towards the reduction of nitrobenzene in aqueous medium and the reaction rate constant was estimated to be 26.31 × 10–3 s–1.
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Document Type: Research Article
Publication date: November 1, 2012
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