Title

Desulfurization of Mercaptobenzimidazole and Thioguanine on Gold Nanoparticles Using Sodium Borohydride in Water at Room Temperature

Authors

Authors

S. M. Ansar; G. S. Perera; F. S. Ameer; S. L. Zou; C. U. Pittman;D. M. Zhang

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

J. Phys. Chem. C

Keywords

ENHANCED RAMAN-SCATTERING; CATALYTIC-ACTIVITY; DEPENDENT CATALYSIS; OXIDATION CATALYSIS; LIGAND ADSORPTION; AU NANOPARTICLES; PARTICLE-SIZE; NANOCLUSTERS; REDUCTION; CLUSTERS; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

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 H-2 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.

Journal Title

Journal of Physical Chemistry C

Volume

117

Issue/Number

26

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

13722

Last Page

13729

WOS Identifier

WOS:000321542000044

ISSN

1932-7447

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