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Updated: Jun 8, 2026
Attaching Biological Probes to Silica Optical Biosensors Using Silane Coupling Agents
Published on: May 1, 2012
Polysiloxane surface modified with bipyrazolic tripodal receptor for quantitative lead adsorption
Smaail Radi1, Saïd Tighadouini, Yahya Toubi
1Laboratoire de Chimie Organique, Macromoléculaire et Produits Naturels, Equipe de Chimie Bio-organique et Macromoléculaire, Unité Associée au CNRST URAC 25, Département de Chimie, Faculté des Sciences, Université Med I, BP 524, 60 000 Oujda, Morocco. radi smaail@yahoo.fr
Abstract:
A new silica gel compound modified N,N-bis(3,5-dimethylpyrazol-1-ylmethyl) amine (SiN(2)Pz) was synthesized and characterized by elemental analysis, FT-IR, (13)C NMR of the solid state, nitrogen adsorption-desorption isotherm, BET surface area and BJH pore sizes. The new surface exhibits good chemical and thermal stability determined by thermogravimetry curves (TGA). The effect of pH and stirring time on the adsorption of Pb(II) were studied. The process of metal retention was followed by batch method and the optimum pH value for the quantitative adsorption of this toxic metal ion was 7. At this pH value, the new functionalized polysiloxane presents further improvements and shows higher affinity (123mg of Pb(2+)/g of silica) for the effective adsorption of Pb(II) compared to others described sorbents. The extracted amounts of Pb(II) were determined by atomic absorption measurements.
