Artículos de revistas
The Use Of Organofuntionalized Silica Gel As Sequestrating Agent For Metals [o Uso De Sílica Gel Organofuncionalizada Como Agente Sequestrante Para Metais]
Registro en:
Quimica Nova. , v. 23, n. 4, p. 496 - 503, 2000.
1004042
2-s2.0-0001594848
Autor
Airoldi C.
De Farias R.F.
Institución
Resumen
An overview about the homogeneous and heterogeneous methods of synthesizing silylating agents and applications of the organofunctionalized silica-gel samples was explored. The pendant molecules attached covalently to the inorganic surface displayed important properties to act as sequestrating agents for metals in aqueous and non-aqueous solutions. The large variety of basic centres anchored on organic molecules improve the capacity in adsorbing cations. The increase in adsorption is dependent on the number of basic atoms disposed on the pendant molecules on the surface. The combination of acidic and basicity properties favours the selectivity, such is exemplified by the thiol modified silicas towards mercury (II) cations. 23 4 496 503 Iler, R.K., (1979) The Chemistry of Silica, , John Wiley & Sons, New York Cerrato, G., Fubini, B., Baricco, M., Moterra, C., (1995) J. Mater. Chem., 5, p. 1935 Wiessner, J.H., Mandel, N.S., Sohnle, P.G., Hasegawa, A., Mandel, G.S., (1990) Am. Rev. Resp. 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