期刊
NANOMATERIALS
卷 10, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/nano10112322
关键词
silver nanoparticles; S-layer protein; DFT; catalytic activity
类别
资金
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (PIO-UNAJ project)
- Universidad Nacional de La Plata [PPID/X050, X922, X802]
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT 2016-0244]
Research on nanoparticles obtained on biological supports is a topic of growing interest in nanoscience, especially regarding catalytic applications. Silver nanoparticles (AgNPs) have been studied due to their low toxicity, but they tend to aggregation, oxidation, and low stability. In this work, we synthesized and characterized AgNPs supported on S-layer proteins (SLPs) as bidimensional regularly arranged biotemplates. By different reduction strategies, six AgNPs of variable sizes were obtained on two different SLPs. Transmission electron microscopy (TEM) images showed that SLPs are mostly decorated by evenly distributed AgNPs; however, a drastic reduction by NaBH4 led to large AgNPs whereas a smooth reduction with H-2 or H-2/NaBH4 at low concentration leads to smaller AgNPs, regardless of the SLP used as support. All the nanosystems showed conversion values between 75-80% of p-nitrophenol to p-aminophenol, however, the increment in the AgNPs size led to a great decrease in Kapp showing the influence of reduction strategy in the performance of the catalysts. Density functional theory (DFT) calculations indicated that the adsorption of p-nitrophenolate species through the nitro group is the most favored mechanism, leading to p-aminophenol as the only feasible product of the reaction, which was corroborated experimentally.
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