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Type: Artigo de periódico
Title: Isotherm data of Fe3+, Cr-3+, and Co2+ adsorbed on surface of silica-propylpiperazinedithiocarbamato
Author: Fonseca, MG
Espinola, JGP
Oliveira, SF
dos Santos, LCR
Souza, AG
Airoldi, C
Abstract: The silylant agent chloropropyltrimetoxysilane immobilized on silica gel reacts with piperazine, followed by another reaction with carbon disulfide in the presence of sodium hydroxide, to produce a new matrix sodium propylpiperazinedithiocarbamato silica. The basic centres of the resulting surface complexes are the Cr3+, Fe3+ and Co2+ cations from aqueous solution. The adsorbed isotherms for cations were adjusted to fit Giles models. The isotherm for Cr3+ could be classified as L2, while those for Fe3+ and Co2+ fitted the subgroup 2 of C class. The isotherm data show that the capacity of the final carbamate surface to chemisorb Fe3+ and Co2+ is Only one third that observed for Cr3+. (C) 1998 Elsevier Science B.V.
Subject: silica gel
C isotherm
Country: Holanda
Editor: Elsevier Science Bv
Citation: Colloids And Surfaces A-physicochemical And Engineering Aspects. Elsevier Science Bv, v. 133, n. 3, n. 205, n. 209, 1998.
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(97)00198-2
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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