Heterogeneous catalyst containing gold nanoparticles (AuNPs) was prepared by direct precipitation of collagen of type I as the stabilization reagent. The composite is fibrous and the AuNPs are found to form patterns of long wires, short wires, and dispersed patterns on collagen. The catalytic reduction of 4-nitrophenol to 4-aminophenol by NaBH4 in the presence of the composite was satisfactory.
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Tang et al. (2008) studied this question.
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