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Type: Artigo de periódico
Title: Some Features Of 2 And 4-aminopyridines Anchored On Silica Gel: Properties And Chemisorption Of Metal(ii) Chlorides In Non-aqueous Solutions
Author: Goncalves A.S.
Airoldi C.
Abstract: Silica gel surfaces modified with 2- or 4-aminopyridine groups were used to adsorb MCl2 (M = Co, Ni, Cu, Zn) from ethanol and acetone solutions at 298 K. The chemisorption isotherms fitted a modified Langmuir equation very well and are similar for all cations. The capacity of anchored 4-aminopyridine (SIL4) in adsorbing the metallic ion is larger than that of the immobilized 2-aminopyridine (SIL2). The maximum retention capacity has the sequence Cu > Co > Zn in acetone for both surfaces, and Zn > Co > Cu > Ni for SIL2, and Zn > Cu > Co > Ni for SIL4 in ethanol. For a given cation, the variation in enthalpy of solvent-solute exchange on the surface is always larger in ethanol. This process seems to be related to the enthalpy of solvation of the cation involved in the exchange. © 1989.
Rights: fechado
Identifier DOI: 10.1016/S0277-5387(00)86288-9
Date Issue: 1989
Appears in Collections:Unicamp - Artigos e Outros Documentos

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