Surface Impregnated Sulfonate Ion Exchangers: Preparation, Properties and Application

Abstract

This paper reviews the results obtained by studying Surface Impregnated Sulfonate Ion Exchangers (SISIE) obtained by modification of macroporous or gel polysterene-divinylbenzene polymers with toluene solutions of dinonylnaphthalene sulfonic acids. Capacities of SISIE of the first type are directly proportional to the concentration of the modifying solution and to the specific surface area of the matrix. Capacities of gel SISIE are much less than those of macroporous samples and depend on the crosslinking of the matrix.Stabilization of SISIE capacity and improvement of their kinetic properties can be achieved using "wet drying " technique. Successive impregnation of the same SISIE sample may be used to increase the capacity of the resin. The ionexchange properties of SISIE are mainly determined by their micellar structure which also defines the areas of possible applications of these ion-exchange materials such as, e.g. ion chromatography and some others Several models have been successfully applied to describe the features of ion exchange processes on SISIE. Application of SISIE as convenient model systems to study aminecarboxylate interaction of amino acid molecules is illustrated by suspension effects measured in SISIE-zwitterlyte and SISIE-HCI suspensions and by the results obtained by the laser-acoustic study of these systems. ') Present address:

Removal of Hg(II) from aqueous solutions using a novel impregnated resin containing 1-(2-thiazolylazo)-2-naphthol (TAN)

“…The impregnating extractant located in the pore volume is weakly retained by the polymer (mainly due to the capillary forces) and can be easily leached out from the freshly prepared EIR samples during the first days of its use (unstable part of EIR capacity). The impregnating extractant taken up by the gel regions of the matrix represents the most stable part of the EIR capacity, which remains practically constant for a long period [39,40]. Thus, for stabilizing the EIR capacity (the amount of extractant impregnated on the resin) 15 cycles of sorption-desorption were carried out by treating the EIR samples with 100-mL aliquots of Hg(VI) solution having high concentration (500 mg L −1 at the optimum pH and ionic strengths) and 10-mL aliquots of HCl 4 M solution as eluent.…”

Recovery and Separation of Metal Ions from Aqueous Solutions by Solvent‐Impregnated Resins

“…Muraviev [53] intensively discussed the wet drying technique and revealed that the IX interaction on SIRs proceeds faster after the wet drying procedure and it can improve the kinetic characteristics of SIRs. However, this method disposes a certain amount of extractant weakly retained by the polymer and inevitably reduces the absorption capacity.…”

Influence of the support base on the sorption of Co(II) with mixed solvents

“…These values are in accordance with the specific surface area sequence of prepared materials since their values are 466.76, 322.49 and 6.91 m 2 /g. Muraviev [24] in 1998 mentioned that the capacity of solvent impregnated resins depends on the concentration of extractant in the impregnating (organic) solution, the swelling of the polymer beads in this solution and the porosity of the polymer. In this study, the first parameter is excluded as the concentration of combined solvents is fixed with respect to the three bases, the other parameters are effective in the preparation of the three resins.…”

“…In this study, the first parameter is excluded as the concentration of combined solvents is fixed with respect to the three bases, the other parameters are effective in the preparation of the three resins. In this concern, many researches have mentioned that Amberlite XAD4 [24] and silica gel [25] have high swelling in the organic solvents while the swelling of wood is slight due to the hydrogen bonding properties of organic liquids [26]. The porosity of the polymer is another parameter which strongly influences the capacity of the resins [27] since the high porosity of the polymeric support leads to higher volumetric uptake of the organic solvents.…”