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|Type:||Artigo de periódico|
|Title:||Chemisorption Of Some Divalent Cations On Silica Modified Through The Reaction Of Pentane-2,4-dione With 3-propylethylenediamine Silica Gel|
de Freitas J.M.P.
de Oliveira S.F.
|Abstract:||The reaction of 3-propylethylenediamine groups covalently bonded to silica gel with pentane-2,4-dione in benzene resulted in a modified surface having 11.4·10-4 mol g-1 of ligand sites which adsorb the divalent cations Co2+, Ni2+, Cu2+ and Zn2+ from ethanol solution with maximum adsorptions of 5.0·10-4 mol g-1, 2.0·10-4 mol g-1, 5.0·10-4 mol g-1 and 5.9·10-4 mol g-1, respectively. The adsorption isotherms are very similar in shape for all the cations and conform to the Langmuir model. The complexes formed on the surface have a molar composition or one cation to two anchored groups of Schiff bases and the geometries of the complexes are similar to those obtained in solution. © 1992.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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