Abstract
A catalyst that Pt nanoparticles (NPs) anchored on hollow silica nanospheres modified by polyamidoamine (PAMAM) dendrimers was synthesized (marked as hollow SiO2–G1–Pt). The hollow silica nanospheres were facilely prepared through etching the template of ZnO nanospheres. Pt NPs exhibited small size (around 2.32 nm) and uniform dispersion owing to the unique physicochemical property of the dendrimers. The catalytic performances of as-prepared catalysts were evaluated with the reduction of p-nitrophenol by NaBH4. The results showed the fabricated hollow SiO2–G1–Pt catalyst exhibited the excellent catalytic activity, which was higher than that of Pt NPs deposited on hollow silica without grafting of PAMAM dendrimers and Pt NPs loaded on PAMAM-modified ZnO@SiO2. Moreover, the results of recycling experiments revealed hollow SiO2–G1–Pt possessed convenient separation and the similar catalytic performance without visible reduction after five runs.
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