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|Type:||Artigo de periódico|
|Title:||Ion-exchange Properties Of Imidazolium-grafted Sba-15 Toward Aucl 4 - Anions And Their Conversion Into Supported Gold Nanoparticles|
Da Costa L.P.
|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. © 2012 American Chemical Society.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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