Concentration and separation of trace metal cations by complexation on polyamine-polyurea resins

The effect of the core morphology of Eu(III)-doped nanoparticles on the ion exchange versus energy transfer between Eu(III) in the core and Cu(II) ions at the interface

“…Both polyelectrolyte layers are able to bind copper ions, though there is significant difference between these types of binding. The efficient specific binding of transition metal ions by PEI through coordination bonds with amino groups is well represented in literature because of its wide application in removal or concentration of metal ions (Wua et al 2011;Laatikainen et al 2007;Dingman et al 1972;Beatty et al 1999a, b). The binding capacity of the PSS molecules with transition metal ions seems to be predominantly electrostatic.…”

Synthesis of new chelating ion exchange resins derived from guaran and divinylbenzene styrene copolymer for selective adsorption of metal ions

“…They have been reported for their extensive use in separation and concentration of metal ions [8][9][10][11][12] .They are useful in mineral processing industries as float aids, depressants, flocculants and collectors. Chelax 100 has been reported to be extensively used .Chelax 100 resin (styrene divinylbenzenecopolymer containing iminodiacetic acid) is used for preconcentration and separation of rare earth and heavy metals in pH range of 6-8 but they exhibit the disadvantage that the affinity of resins for alkaline earth metal is similar to that of transition ions.…”

The synthesis, characterization, and application of chelating ion-exchange resins

“…The effects have been studied of percent age cross-linkage, group distribution, i.e., the spacing of the groups, and affinity for metal ions of the resin matrix on kinetics, swelling behavior, and stability of the resin and its chelates (13,20,(58)(59)(60)(88)(89)(90)(91).…”

“…And, it has a relatively high affinity for calcium (II) and magnesium (II), that of calcium (II) being equal to that of zinc (II) (20,26,32,92).…”

“…Therefore, a concentration and separation step is required for which chelating resins are Ideally suited. Chelating resins bind the heavy metals preferentially to the alkali and alkaline earth metals and are rapid, quantitative concentrating agents (16)(17)(18)(19)(20), Mellor (4) was the first to suggest the superiority of the chelating resin to the ordinary ion-exchange resin for binding heavy metals in the presence of sodium, calcium, and magnesium. He pointed out that an improvement in the efficiency of the resins, containing sulfonic acid, carboxylic acid and phenol functional groups, for trace metals could be effected by devising resins with active groups such as =NOH and =NH that would form more stable metal chelate rings.…”