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Type: Artigo de periódico
Title: Adsorption and separation of cations on silica gel chemically modified by homogeneous and heterogeneous routes with the ethylenimine anchored on thiol modified silica gel
Author: Prado, AGS
Arakaki, LNH
Airoldi, C
Abstract: Ethyleneimine (etn) has been covalently bonded onto silica gel via homogeneous (SiSN1) and heterogeneous (SiSN2) routes. Both synthesised silica gel surfaces have been applied to adsorb divalent cations from aqueous solution at room temperature. The series of isotherms of adsorption were adjusted to a modified Langmuir equation. after collecting the data from the solid/MCl2 solution (M = Co, Ni, Cu, Pb and Hg) interfaces. The maximum adsorption were 1.08, 1.20, 1.70, 1.34 and 4.02 mmol g(-1) for SiSN1 and 0.72, 1.74, 1.91, 2.19 and 2.89 mmol g(-1) for SiSN2, for a the sequence of divalent cations: Co, Ni, Cu, Pb and Hg, respectively. Columns loaded with immobilised silica show resolutions (R) for separating metal ion couples: RCo-Ni=0.22, RCo-Pb=0.76, RCo-Cu=1.12. : RCo-Hg=2.06, RNt-Pb=0.50, RNi-Cu=1.17. RNi-Hg=2.38, RPb-Cu=0.33, RPb-Hg=1.83 and RCu-Hg=1.60 for the SiSN1 surface. The sequence: RCo-Ni=1.10, RCo-Pb=1.44. RCo-Co=1.63. : RCo-Hg=2.26, RNi-Pb=0.08, RNi-Cu=0.33, RNi-Hg=1.40, RPb-Cu=0.38, RPb-Hg=1.82 and RCu-Hg=1.55 was determined for SiSN2.
Country: Inglaterra
Editor: Royal Soc Chemistry
Citation: Green Chemistry. Royal Soc Chemistry, v. 4, n. 1, n. 42, n. 46, 2002.
Rights: embargo
Identifier DOI: 10.1039/b108749e
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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