Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al2O3 toward an Efficient Catalyst for Glucose OxidationReportar como inadecuado




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1

Key Laboratory for Food Science & Engineering, Harbin University of Commerce, Harbin 150076, China

2

State Key Laboratory for Oxo Synthesis & Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China





*

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Abstract Methanobactin Mb is a copper-binding peptide that appears to function as an agent for copper sequestration and uptake in methanotrophs. Mb can also bind and reduce AuIII to Au0. In this paper, Au-Al2O3 catalysts prepared by a novel incipient wetness-Mb-mediated bioreduction method were used for glucose oxidation. The catalysts were characterized, and the analysis revealed that very small gold nanoparticles with a particle size <4 nm were prepared by the incipient wetness-Mb-mediated bioreduction method, even at 1.0% Au loading w-w. The influence of Au loading, calcination temperature and calcination time on the specific activity of Au-Al2O3 catalysts was systematically investigated. Experimental results showed that decomposing the Mb molecules properly by calcinations can enhance the specific activity of Au-Al2O3 catalysts, though they acted as reductant and protective agents during the catalyst preparation. Au-Al2O3 catalysts synthesized by the method exhibited optimum specific activity under operational synthesis conditions of Au loading of 1.0 wt % and calcined at 450 °C for 2 h. The catalysts were reused eight times, without a significant decrease in specific activity. To our knowledge, this is the first attempt at the preparation of Au-Al2O3 catalysts by Mb-mediated in situ synthesis of gold nanoparticles. View Full-Text

Keywords: methanobactin; bioreduction; glucose oxidation; gold nanoparticles; Au-Al2O3 catalysts methanobactin; bioreduction; glucose oxidation; gold nanoparticles; Au-Al2O3 catalysts





Autor: Jia-Ying Xin 1,2,* , Kai Lin 1, Yan Wang 1 and Chun-Gu Xia 2

Fuente: http://mdpi.com/



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