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Type: Artigo de periódico
Title: Ion-exchange Properties Of Imidazolium-grafted Sba-15 Toward Aucl4(-) Anions And Their Conversion Into Supported Gold Nanoparticles.
Author: Fattori, Natalia
Maroneze, Camila M
da Costa, Luiz P
Strauss, Mathias
Sigoli, Fernando A
Mazali, Italo O
Gushikem, Yoshitaka
Abstract: Imidazolium groups were successfully prepared and grafted on the surface of SBA-15 mesoporous silica. The ion-exchange properties of the functionalized porous solid (SBA-15/R(+)Cl(-)) toward AuCl(4)(-) anions were evaluated through an ion-exchange isotherm. The calculated values of the equilibrium constant (log β = 4.47) and the effective ion-exchange capacity (t(Q) = 0.79 mmol g(-1)) indicate that the AuCl(4)(-) species can be loaded and strongly retained on the functionalized surface as counterions of the imidazolium groups. Subsequently, solids containing different amounts of AuCl(4)(-) ions were submitted to a chemical reduction process with NaBH(4), converting the anionic gold species into supported gold nanoparticles. The plasmon resonance bands, the X-ray diffraction patterns, and transmission electron microscopy images of the supported gold nanoparticles before and after thermal treatment at 973 K indicate that the metal nanostructures are highly dispersed and stabilized by the host environment.
Citation: Langmuir : The Acs Journal Of Surfaces And Colloids. v. 28, n. 27, p. 10281-8, 2012-Jul.
Rights: fechado
Identifier DOI: 10.1021/la301374z
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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