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Probing the surface reactivity of nanocrystals by the catalytic degradation of organic dyes : the effect of size, surface chemistry and composition
Piella, Jordi (Institut Catala de Nanociencia i Nanotecnologia)
Merkoçi, Florind (Institut Catala de Nanociencia i Nanotecnologia)
Genç, Aziz (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Gómez Bastús, Neus (Institut Català de Nanociència i Nanotecnologia)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)
Universitat Autònoma de Barcelona

Date: 2017
Abstract: We herein present a comprehensive study on how the catalytic performance and reusability of Au nanocrystals (NCs) are affected by systematic variations of crystal size, surface coating and composition. The reductions of different organic dyes (4-nitrophenol, rhodamine B and methylene blue) by borohydride ions were used as model catalytic reactions. The catalytic performance of the Au NCs ranged between 3. 6 to 110 nm was found to be dependent on crystal size, indicating that Au surface atoms have a distinct size-dependent reactivity in this reaction. Similarly, the catalytic performance was found to be strongly dependent on the nature of the coating molecule, obtaining lower catalytic activities for molecules strongly bound to the Au surface. Finally, the catalytic performance was found to be dependent on the chemical composition of the NC (Au, Ag, Pt) and the model dye used as a testing system, with the highest degradation rate found for methylene blue, followed by 4-nitrophenol and rhodamine B. We believe that this study provides a better understanding of the catalytic performance of Au NCs upon controlled modifications of the structural and morphological parameters, and a working environment that can be used to facilitate the selection of the optimum NC size, coating molecule and evaluation system for a particular study of interest.
Note: Número d'acord de subvenció EC/FP7/685817
Note: Número d'acord de subvenció EC/FP7322153
Note: Número d'acord de subvenció MICINN/MAT2015-70725-R
Note: Número d'acord de subvenció MINECO/SEV-2013-0295
Note: Número d'acord de subvenció MINECO/RYC-2012-10991
Note: Número d'acord de subvenció AGAUR/2014/SGR-612
Rights: Tots els drets reservats.
Language: Anglès.
Document: article ; recerca ; acceptedVersion
Subject: Catalytic degradation ; Catalytic performance ; Catalytic reactions ; Chemical compositions ; Controlled modification ; Morphological parameters ; Size-dependent reactivity ; Systematic variation
Published in: Journal of materials chemistry A, Vol. 5, Issue 23 (June 2017) , p. 11917-11929, ISSN 2050-7496

DOI: 10.1039/c7ta01328k


Post-print
24 p, 2.4 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles

 Record created 2018-07-25, last modified 2019-07-17



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