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

    Authors

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

    Comments

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    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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