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


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 Clwas 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.



subject category

Chemistry, Inorganic & Nuclear


Leandro, SR; Marques, IJ; Torres, RS; Fernandes, TA; Vaz, PD; Nunes, CD

our authors


The authors would like to acknowledge FCT for financial support (projects UIDB/00100/2020 and UIDP/00100/2020). TAF thanks CQB and FCT for a fellowship (PEst-OE/MULTI/00612/2013 and CEECIND/02725/2018).

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