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Photoinduced in Situ Deposition of Uniform and Well-Dispersed PtO2 Nanoparticles on ZnO Nanorods for Efficient Catalytic Reduction of 4‑Nitrophenol
journal contribution
posted on 2018-06-18, 00:00 authored by Xiaoyan Yang, Yi Li, Peng Zhang, Rongmei Zhou, Hailong Peng, Dan Liu, Jianzhou GuiBased
on the photochemical property of semiconductors, a light irradiation-assisted
strategy has been designed using one-dimensional ZnO nanorods as carriers
to synthesize the rod-type PtO2/ZnO catalyst with a well-defined
structure. The high crystallinity and uniform crystal structure of
the ZnO matrix conduct the in situ deposition of PtO2 nanoparticles
with 1.1–2.1 nm, which are evenly and densely anchored on the
surface. Those small-sized and well-dispersed PtO2 nanoparticles
endow the PtO2/ZnO catalyst a superior catalytic performance
for the reduction of 4-nitrophenol to 4-aminophenol, which can convert
all the substrates within 6.25 min. It is demonstrated that the catalytic
activity of the PtO2/ZnO catalyst is 2.3 times as high
as that of the sample obtained by traditional wet-oxidation method
under the same reaction conditions. Moreover, the light-irradiation
time has been found to greatly affect the structure and activity of
PtO2/ZnO catalysts, and the product with 30 min exhibits
the best catalytic performance in this work, as well as the good stability
for ten runs. In terms of the photoexcited process of ZnO and reactive
species-trapped experiments, the formation mechanism of PtO2/ZnO catalysts has been explored in detail, which will probably stimulate
the design and study of other metal-supported catalysts.
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light-irradiation time4- aminophenolmetal-supported catalystsEfficient Catalytic Reductionlight irradiation-assisted strategywet-oxidation methodPtO 2 nanoparticles30 min exhibits6.25 min2.3 timesuniform crystal structureZnO Nanorodswell-dispersed PtO 2 nanoparticlesWell-Dispersed PtO 2 NanoparticlesZnO matrix conductreaction conditionsSitu Depositionformation mechanismZnO nanorods4- nitrophenolreactive species-trapped experimentsphotoexcited process
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