Metal uptake by porous iminobis(N-2-aminoethylacetamide)-modified polysiloxane ligand system

Template Synthesis of Iminodiacetic Acid Polysiloxane Immobilized Ligand Systems and their Metal Uptake Capacity

“…CTAB was extracted from the material by refluxing with ethanol. The [11,21,22] Diethyliminodiacetate polysiloxane material (P-DIDA-I) was prepared by adding diethyliminodiacetate (9.45 g 0.05 mol) to (10 g, 0.032 mol) of iodopolysiloxane (A-D) ( Table 1) in (50 ml, 0.610 mol) of THF. The mixture was stirred and refluxed at 95 • C for 48 hours.…”

“…Recently, immobilization of chelating groups on the surface of inorganic solid supports, especially silica gel and polysiloxanes, are gaining high importance due to their excellent thermal, mechanical and chemical stability [7,8]. Polysiloxanes functionalized by chelating ligands have been widely exploited for extraction and preconcentration of trace metal ions from different media by batch and dynamic methods [9][10][11][12][13][14][15][16][17][18]. There is consequently interest in developing functionalized polysiloxanes with suitable complexing agents which have high potential for uptake of metal ions [9][10][11][12][13][14][15][16][17][18].…”

“…There is consequently interest in developing functionalized polysiloxanes with suitable complexing agents which have high potential for uptake of metal ions [9][10][11][12][13][14][15][16][17][18]. These immobilized ligand systems could be synthesized either directly by the sol-gel method or by chemical modification of the pre-prepared polysiloxanes [9][10][11][12][13][14][15][16][17][18]. These functionalized systems have been used in many important applications including extraction and separation of metal cations from organic solvents and aqueous solutions, chromatographic stationary phases and heterogeneous catalysis [9][10][11][12][13][14][15][16][17][18].…”

“…These immobilized ligand systems could be synthesized either directly by the sol-gel method or by chemical modification of the pre-prepared polysiloxanes [9][10][11][12][13][14][15][16][17][18]. These functionalized systems have been used in many important applications including extraction and separation of metal cations from organic solvents and aqueous solutions, chromatographic stationary phases and heterogeneous catalysis [9][10][11][12][13][14][15][16][17][18]. In previous research, iminodiacetic acid (IDA) functionalized polysiloxane ligand systems were prepared by the sol-gel process in the absence of surfactants [15] or by modification of silica with an IDA-functionalized silane coupling agent [19,20].…”

“…In previous research, iminodiacetic acid (IDA) functionalized polysiloxane ligand systems were prepared by the sol-gel process in the absence of surfactants [15] or by modification of silica with an IDA-functionalized silane coupling agent [19,20]. More recently IDAfunctionalized mesoporous silica was prepared by treatment of iodopolysiloxane or iodofunctionalized mesoporous silica with diethyliminodiacetate [11,21,22].…”