Journal
CATALYSTS
Volume 6, Issue 12, Pages -Publisher
MDPI AG
DOI: 10.3390/catal6120215
Keywords
soluble gold nanoparticles; catalytic chemical reduction; anisotropic nanoparticles; reduction of nitro compounds
Categories
Funding
- Brazilian research founding agency, Research and Projects Financing (FINEP)
- Brazilian research founding agency, National Counsel of Technological and Scientific Development (CNPq)
- Brazilian research founding agency, Alagoas Research Support Foundation (FAPEAL)
- Brazilian research founding agency, Instituto Nacional de Ciencia e Tecnologia de Catalise em Sistemas Moleculares e Nanoestruturados (INCT-Catalise)
- CNPq
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
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Gold nanoparticles with different shapes were prepared and used as catalysts in the reduction of p-nitrophenol (PNP) in the aqueous phase and in the presence of sodium borohydride (NaBH4). Parameters such as the reaction temperature, substrate/NaBH4 molar ratio, and substrate/gold molar ratio were tested and evaluated. In this paper, we compare the catalytic reactivities of gold nanorods (AuNRs) and gold nanospheres (AuNSs), both synthesized by the seed-mediated method in the presence of cetyltrimethyl ammonium bromide (CTAB). Physical-chemical parameters such as the apparent rate constant (k(app)) and activation energy (E-a) of the reactions were obtained for both systems. We observed that the catalytic system based on AuNRs is the most active. These colloidal dispersions were investigated and fully characterized by ultraviolet-visible absorption spectroscopy (UV-Vis) and transmission electron microscopy (TEM).
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