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Nitroarene and dye reduction with 2:1 Co/Al layered double hydroxide catalysts – Is gold still necessary?

Nitroarene and dye reduction with 2:1 Co/Al layered double hydroxide catalysts – Is gold still necessary?

Authors :
Ruben S. Torres
Sónia R. Leandro
Pedro D. Vaz
Tiago A. Fernandes
Carla D. Nunes
Ines J. Marques
Source :
Inorganica Chimica Acta. 521:120336
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

A 2:1 Co/Al layered double hydroxide (LDH) material was synthesized with Cl– anions intercalated and then anion exchanged with deprotonated methionine. This allowed further immobilization of Au nanoparticles. The catalytic performance of the set of three LDH materials for comparative benchmarking was assessed in the aqueous reduction of nitroaromatic compounds and of rhodamine dyes in the presence of NaBH4. All catalysts were found to be very active for the nitro-to-amine reduction. The same was observed for the dyes, where reduction rhodamine 6G was faster than that of rhodamine B, for all catalysts. While the Au-containing catalyst was apparently the one showing the best catalytic activity the LDH with Cl– was found to follow it closely in terms of catalytic performance. In addition, while the LDH catalyst with Au was prone to deactivation by amine products in recycling experiments, the LDH catalyst with Cl– was almost insensitive to that, which is a large advantage. These results showed that using a catalyst based on first-row metals for efficient processes is possible and addresses current sustainable and environmental concerns.

Details

ISSN :
00201693
Volume :
521
Database :
OpenAIRE
Journal :
Inorganica Chimica Acta
Accession number :
edsair.doi.dedup.....efa0a0c5e87aa0cd406c5607441a9a04
Full Text :
https://doi.org/10.1016/j.ica.2021.120336