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Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation

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 Au(III) to Au(0). In this paper, Au/Al(2)O(3) catalysts prepared by a novel incipient wetness-Mb-mediated bioreduction method were use...

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Autores principales: Xin, Jia-Ying, Lin, Kai, Wang, Yan, Xia, Chun-Gu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284666/
https://www.ncbi.nlm.nih.gov/pubmed/25429424
http://dx.doi.org/10.3390/ijms151221603
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author Xin, Jia-Ying
Lin, Kai
Wang, Yan
Xia, Chun-Gu
author_facet Xin, Jia-Ying
Lin, Kai
Wang, Yan
Xia, Chun-Gu
author_sort Xin, Jia-Ying
collection PubMed
description 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 Au(III) to Au(0). In this paper, Au/Al(2)O(3) 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/Al(2)O(3) catalysts was systematically investigated. Experimental results showed that decomposing the Mb molecules properly by calcinations can enhance the specific activity of Au/Al(2)O(3) catalysts, though they acted as reductant and protective agents during the catalyst preparation. Au/Al(2)O(3) 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/Al(2)O(3) catalysts by Mb-mediated in situ synthesis of gold nanoparticles.
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spelling pubmed-42846662015-01-21 Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation Xin, Jia-Ying Lin, Kai Wang, Yan Xia, Chun-Gu Int J Mol Sci Article 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 Au(III) to Au(0). In this paper, Au/Al(2)O(3) 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/Al(2)O(3) catalysts was systematically investigated. Experimental results showed that decomposing the Mb molecules properly by calcinations can enhance the specific activity of Au/Al(2)O(3) catalysts, though they acted as reductant and protective agents during the catalyst preparation. Au/Al(2)O(3) 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/Al(2)O(3) catalysts by Mb-mediated in situ synthesis of gold nanoparticles. MDPI 2014-11-25 /pmc/articles/PMC4284666/ /pubmed/25429424 http://dx.doi.org/10.3390/ijms151221603 Text en © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xin, Jia-Ying
Lin, Kai
Wang, Yan
Xia, Chun-Gu
Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title_full Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title_fullStr Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title_full_unstemmed Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title_short Methanobactin-Mediated Synthesis of Gold Nanoparticles Supported over Al(2)O(3) toward an Efficient Catalyst for Glucose Oxidation
title_sort methanobactin-mediated synthesis of gold nanoparticles supported over al(2)o(3) toward an efficient catalyst for glucose oxidation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4284666/
https://www.ncbi.nlm.nih.gov/pubmed/25429424
http://dx.doi.org/10.3390/ijms151221603
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