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Journal of Materials Science
Published in: Journal of Materials Science 16/2017

04-05-2017 | Chemical routes to materials

RhAg/rGO nanocatalyst: ligand-controlled synthesis and superior catalytic performances for the reduction of 4-nitrophenol

Authors: Changlong Wang, Roberto Ciganda, Luis Yate, Sergio Moya, Lionel Salmon, Jaime Ruiz, Didier Astruc

Published in: Journal of Materials Science | Issue 16/2017

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Abstract

The design of ultrafine, highly efficient and recyclable heterogeneous bimetallic nanoparticles catalysts is challenging. In this work, we report for the first time the preparation of ultrafine and monodispersed bimetallic RhAg nanoparticles that are uniformly supported on reduced graphene oxide (rGO) nanosheets (RhAg/rGO). A key is the presence of the tris(triazolyl)-polyethylene glycol (tristrz-PEG) ligand as a weak stabilizing agent. This amphiphilic tridentate ligand not only enables the formation of ultrafine RhAg NPs, but also allows quantitative fixation of the NPs onto the rGO, which avoids metal loss and further improves catalytic efficiency. The RhAg/rGO catalysts were characterized by various techniques including UV–Vis, ICP-AES, TEM, HRTEM, STEM, EDX and XPS. By varying the molar ratios of Rh to Ag, the highest catalytic activity in the reduction of 4-nitrophenol by NaBH4 was obtained for RhAg0.5/rGO with a remarkable reaction rate of k app = 14.8 × 10−3 s−1 (k nor = 1415 s−1 g−1). Moreover, the catalyst was recycled, and its amount was reduced to 100 ppm of RhAg0.5/rGO while retaining an exceptional catalytic efficiency. The present work contributes to the effective design of ultrafine bimetallic NPs/graphene-based nanocomposites and to the fabrication of very efficient and cost-effective catalysts.
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Metadata
Title
RhAg/rGO nanocatalyst: ligand-controlled synthesis and superior catalytic performances for the reduction of 4-nitrophenol
Authors
Changlong Wang
Roberto Ciganda
Luis Yate
Sergio Moya
Lionel Salmon
Jaime Ruiz
Didier Astruc
Publication date
04-05-2017
Publisher
Springer US
Published in
Journal of Materials Science / Issue 16/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-017-1158-7

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