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Type: Artigo de periódico
Title: Exchange Properties Of Silica Gel Functionalized With Pyridinium Ion
Author: Gushikem Y.
Moreira W.C.
Abstract: The selectivity constants of silica gel functionalized with pyridinium ion were studied in exchange reactions with IO3 -, ClO4 -, Br-, I-, SCN-, ClO3 -, BrO3 - and IO4 -. The experimental affinities, in decreasing order, were: ClO4 - ≫ SCN-≫ I- ≫ IO4 - ≫Br- ≫ ClO3 - ≫ BrO3 - ≫ IO3 -. In a competitive reaction, a solution containing ClO4 - and another anion, at a concentration ratio [ClO4 -] : [B] = 1:1 in contact with the exchanger phase, showed after equilibration, that IO3 - and BrO3 - remained 100% in the aqueous phase (ratio of selectivity constant K(ClO4 -) : K(IO3 -) ∼ 320 and K(ClO4 -) : K(BrO3 -) ∼ 80). For the other anions where the ratio K (ClO4 -) : K(B) ≦50, the mole fractions of B in the exchanger phase were (in percent): SCN- =35, I-=29, Br-=35, ClO3 -=22 and IO4 -=7. © 1987.
Rights: fechado
Identifier DOI: 10.1016/0166-6622(87)80299-8
Date Issue: 1987
Appears in Collections:Unicamp - Artigos e Outros Documentos

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