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Type: Artigo de periódico
Title: Highly-controlled grafting of mono and dicationic 4,4 '-bipyridine derivatives on SBA-15 for potential application as adsorbent of CuCl2 from ethanol solution
Author: Fattori, N
Maroneze, CM
Magosso, HA
Kholin, YV
Gushikem, Y
Abstract: This work describes a highly controlled post-grafting of mono and dicationic 4,4'-bipyridine alkoxysilane derivatives (Bipy(+) and Bipy(2+)) onto the surface of an ordered mesoporous silica, SBA-15. The materials obtained are designated as SBA-15/Bipy(+)Cl(-) and SBA-15/Bipy(2+)Cl(2)(-), both possessing chloride as counter ion. The regular arrangement of uniform pores of this inorganic matrix is likely to ensure good accessibility to the active centers (electron acceptors) attached to the surface. The materials are excellent adsorbents due to the ability of the functional groups to retain copper chlorides on their surfaces as anionic complexes (CuCl2+nn-) in ethanol. From the adsorption results it was possible to probe the functional surface monolayer of the materials, which present a highly homogenous distribution of functional groups inside the ordered SBA-15 channels, with an exchange efficiency of 93% for SBA-15/Bipy(+)Cl(-) and 94% for SBA-15/Bipy(2+)Cl(2)(-). Both adsorbent materials are potentially useful in the pre-concentration and further analysis of Cu(II) present in trace amounts in ethanol, extensively used as an automotive fuel in Brazil. (C) 2012 Elsevier Inc. All rights reserved.
Subject: SBA-15
4,4 '-Bipyridine
Anionic copper complex
Functional surface monolayer
Country: EUA
Editor: Academic Press Inc Elsevier Science
Citation: Journal Of Colloid And Interface Science. Academic Press Inc Elsevier Science, v. 384, n. 137, n. 142, 2012.
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2012.06.065
Date Issue: 2012
Appears in Collections:Unicamp - Artigos e Outros Documentos

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