Incorporation of amide functional groups to graphene oxide during the photocatalytic degradation of free cyanide

[Display omitted] •Graphene oxide showed remarkable photocatalytic activity in the degradation of free cyanide.•Amide groups functionalized graphene oxide during the degradation of free cyanide.•The amide functionalization reduced the photocatalytic performance of graphene oxide. Pristine graphene o...

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Bibliographic Details
Published in:Materials letters 2020-12, Vol.280, p.128538, Article 128538
Main Authors: Barrera-Andrade, José M., Rojas-García, Elizabeth, García-Valdés, Jesús, Valenzuela, Miguel A., Albiter, Elim
Format: Article
Language:English
Subjects:
Amide
Aqueous solutions
Byproducts
Cyanates
Degradation
Free cyanide
Functional groups
Functionalization
Graphene
Graphene oxide
Materials science
Oxidation
Photocatalysis
Photodegradation
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Summary:[Display omitted] •Graphene oxide showed remarkable photocatalytic activity in the degradation of free cyanide.•Amide groups functionalized graphene oxide during the degradation of free cyanide.•The amide functionalization reduced the photocatalytic performance of graphene oxide. Pristine graphene oxide (GO) prepared by a conventional method (Hummers) showed to be a promising photocatalyst for the degradation of free cyanide (CN−) in aqueous solution. High conversion of cyanide was found (ca. 80%), revealing that the main by-product was amide species (CONH2) linked to GO, and a minimal amount was cyanate (CNO−) by-product in solution. Our results, supported by FTIR and Raman characterization, explain GO direct functionalization by the amide species formed during the cyanide photocatalytic oxidation. This finding could provide a new way to perform immediate GO functionalization through photocatalytic reactions and its use in other applications (e.g., CO2 adsorption).
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.128538