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Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose

[Image: see text] Diatoms are unicellular algae of enormous biodiversity that occur in all water habitats on earth. Their cell walls are composed of amorphous biosilica and exhibit species-specific nanoporous to microporous and macroporous patterning. Therefore, diatom biosilica is a promising renew...

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Autores principales: Fischer, Cathleen, Adam, Marion, Mueller, Andrea Christiane, Sperling, Evgeni, Wustmann, Martin, van Pée, Karl-Heinz, Kaskel, Stefan, Brunner, Eike
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2016
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641437/
https://www.ncbi.nlm.nih.gov/pubmed/31457194
http://dx.doi.org/10.1021/acsomega.6b00406
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author Fischer, Cathleen
Adam, Marion
Mueller, Andrea Christiane
Sperling, Evgeni
Wustmann, Martin
van Pée, Karl-Heinz
Kaskel, Stefan
Brunner, Eike
author_facet Fischer, Cathleen
Adam, Marion
Mueller, Andrea Christiane
Sperling, Evgeni
Wustmann, Martin
van Pée, Karl-Heinz
Kaskel, Stefan
Brunner, Eike
author_sort Fischer, Cathleen
collection PubMed
description [Image: see text] Diatoms are unicellular algae of enormous biodiversity that occur in all water habitats on earth. Their cell walls are composed of amorphous biosilica and exhibit species-specific nanoporous to microporous and macroporous patterning. Therefore, diatom biosilica is a promising renewable material for various applications, such as in catalysis, drug-delivery systems, and biophotonics. In this study, diatom biosilica of three different species (Stephanopyxis turris, Eucampia zodiacus, and Thalassiosira pseudonana) was used as support material for gold nanoparticles using a covalent coupling method. The resulting catalysts were applied for the oxidation of d-glucose to d-gluconic acid. Because of its high specific surface area, well-established transport pores, and the presence of small, homogeneously distributed gold nanoparticles on the surface, diatom biosilica provides a highly catalytically active surface and advanced accessibility to the active sites. In comparison to those of the used reference supports, higher catalytic activities (up to 3.28 × 10(–4) mmol(Glc) s(–1) mg(Au)(–1) for T. pseudonana biosilica) and slower deactivation were observed for two of the diatom biosilica materials. In addition, diatom biosilica showed very high gold-loading capacities (up to 45 wt %), with a homogeneous nanoparticle distribution.
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spelling pubmed-66414372019-08-27 Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose Fischer, Cathleen Adam, Marion Mueller, Andrea Christiane Sperling, Evgeni Wustmann, Martin van Pée, Karl-Heinz Kaskel, Stefan Brunner, Eike ACS Omega [Image: see text] Diatoms are unicellular algae of enormous biodiversity that occur in all water habitats on earth. Their cell walls are composed of amorphous biosilica and exhibit species-specific nanoporous to microporous and macroporous patterning. Therefore, diatom biosilica is a promising renewable material for various applications, such as in catalysis, drug-delivery systems, and biophotonics. In this study, diatom biosilica of three different species (Stephanopyxis turris, Eucampia zodiacus, and Thalassiosira pseudonana) was used as support material for gold nanoparticles using a covalent coupling method. The resulting catalysts were applied for the oxidation of d-glucose to d-gluconic acid. Because of its high specific surface area, well-established transport pores, and the presence of small, homogeneously distributed gold nanoparticles on the surface, diatom biosilica provides a highly catalytically active surface and advanced accessibility to the active sites. In comparison to those of the used reference supports, higher catalytic activities (up to 3.28 × 10(–4) mmol(Glc) s(–1) mg(Au)(–1) for T. pseudonana biosilica) and slower deactivation were observed for two of the diatom biosilica materials. In addition, diatom biosilica showed very high gold-loading capacities (up to 45 wt %), with a homogeneous nanoparticle distribution. American Chemical Society 2016-12-16 /pmc/articles/PMC6641437/ /pubmed/31457194 http://dx.doi.org/10.1021/acsomega.6b00406 Text en Copyright © 2016 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Fischer, Cathleen
Adam, Marion
Mueller, Andrea Christiane
Sperling, Evgeni
Wustmann, Martin
van Pée, Karl-Heinz
Kaskel, Stefan
Brunner, Eike
Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title_full Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title_fullStr Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title_full_unstemmed Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title_short Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose
title_sort gold nanoparticle-decorated diatom biosilica: a favorable catalyst for the oxidation of d-glucose
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641437/
https://www.ncbi.nlm.nih.gov/pubmed/31457194
http://dx.doi.org/10.1021/acsomega.6b00406
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