Abstract
In this paper, core-shell SiO2/polypyrrole (SiO2/PPy) composites were prepared via in situ chemical oxidation of pyrrole monomer on surface of the modified SiO2 by using FeCl3 as the oxidant. Au nanoparticles (NPs) were loaded on SiO2/PPy composites by means of the redox reaction between PPy and gold ions. Several analytical tools, such as TEM, FT-IR, XRD and EDX, were employed to characterize the morphology and structure of the as-prepared SiO2/PPy/Au composites. Their catalytic performances in reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) with NaBH4 as the reducing agent were studied. Results showed that the conversion of 4-NP was increased with an decrease of Au loading. The reduction of trace AuCl4− ions in core-shell composites to small Au NPs by NaBH4 in the beginning of the reaction favored the enhancement of catalytic activity.
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