Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/100628
Type: Artigo de periódico
Title: Isotherm Data Of Fe3+, Cr3+ And Co2+ Adsorbed On Surface Of Silica-propylpiperazinedithiocarbamato
Author: Fonseca M.G.
Espinola J.G.P.
Oliveira S.F.
Ramos Dos Santos L.C.
Souza A.G.
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+.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+.
Editor: Elsevier Sci B.V., Amsterdam, Netherlands
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(97)00198-2
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-0032574295&partnerID=40&md5=fa17c2fb4e18808bd3308146c62c1b03
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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