Title

Desulfurization Of Mercaptobenzimidazole And Thioguanine On Gold Nanoparticles Using Sodium Borohydride In Water At Room Temperature

Abstract

Organosulfur compounds are known to poison metallic nanoparticle catalysts. Herein NaBH4 is shown to desorb and desulfurize 2- mercaptobenzimidazole (2-MBI) and 6-thioguanine (6-TG) adsorbed on 10, 15, and 50 nm diameter gold nanoparticles (AuNPs). The desulfurization rates decrease significantly with increasing AuNP sizes. Isotope labeling experiments, conducted with NaBD4 in H2O, indicate that this desulfurization reaction proceeds through a pathway requiring hydrogen uptake onto AuNP surfaces prior to the 2-MBI or 6-TG desulfurization reaction, rather than direct hydride attack from BH4- on the sulfur-bearing carbon in 2-MBI or 6-TG, or H2 reaction with 2-MBI or 6-TG. In addition to serving as the hub for electron charge transfer between hydride and proton, AuNPs capture the cleaved sulfide, facilitating sulfur separation from the desulfurized products. © 2013 American Chemical Society.

Publication Date

7-3-2013

Publication Title

Journal of Physical Chemistry C

Volume

117

Issue

26

Number of Pages

13722-13729

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp403932w

Socpus ID

84879807953 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84879807953

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