Determination of Copper in Different Ethanolic Matrices Using a Chloropropyl Silica Gel Modified with a Nanostructured Cubic Octa(3-aminopropyl)octasilsesquioxane

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Author(s):	Do Carmo, Devaney Ribeiro ; Bicalho, Urquisa De Oliveira ; Silveira, Tayla Fernanda A. ; Dias Filho, Newton Luiz ; Paim, Leonardo Lataro Total Authors: 5
Document type:	Journal article
Source:	JOURNAL OF CHEMISTRY; v. 2013, p. 11-pg., 2013-01-01.
Abstract
The chloropropyl silica gel was modified with octa(3-aminopropyl)octasilsesquioxane and characterized by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR), spectroscopies, and surface and area porosity. The specific sorption capacity of metallic ions (Cu2+ and Ni2+) increases in the following solvent order: water < ethanol 42% < ethanol < ketone. The high values of the constant (K) in the order of 10(3) L mol(-1) suggested the high adsorbent capacity of the modified silica (SGAPC) for Cu2+ and Ni2+. SGAPC was applied to a separation column and shows recoveries of around 100% of copper in samples of sugar cane spirit, vodka, ginger brandy, and ethanol fuel. (AU)