Recovery of Cu(II) and Cd(II) by a chelating resin containing aspartate groups

Evaluation of chelate and cation exchange resins to remove copper ions

“…In our work, the value of R L obtained for all resins were between 0.75-0.90. Resins were reported in several studies for Cu 2+ removal from aqueous solutions (Table 4) [33][34][35][36][37][38].…”

“…1.05 mol/L [33] Polyacrylonitrile/pumice composite 0.065 mmol/g [34] Amino acid modified pGMA 1.4 mmol/g [35] Chelating sponge (PVA-MA-HH) 72.66 mg/g [36] Lewatit MonoPlus TP-220 9.84 mg/g [37] C110 5. …”

Adsorption performances and mechanisms of the newly synthesized N,N′-di (carboxymethyl) dithiocarbamate chelating resin toward divalent heavy metal ions from aqueous media

“…The adsorption of Cu(II) and Ni(II) ions on the resin was clearly more favorable at the pH-value of 5, compared with Pb(II) ion at 6. These adsorption trends could probably be affected by the competitive interaction between metal and hydrogen ions with the active sites on the surface of the resins [22][23][24]. At lower pH, an excess of hydrogen ions can compete effectively with metal ions for binding sites, resulting in a lower level of metal uptake.…”

Novel salep-based chelating hydrogel for heavy metal removal from aqueous solutions

“…In the literature, different affinity sorbents with a wide range of adsorption capacities for heavy metal ions have been reported. [3][4][5][6][7][8][9][10][11][12][13][14][15] …”

“…[3] Among these various methods, adsorption of heavy metals by chelating hydrogels is widely investigated and has had many interesting achievements. [3][4][5][6][7][8][9] Metal ion chelating polymers, called polychelatogens, contain one or more electron-donor groups (Lewis bases) such as vinyl pyridine, [3] N-methacryloylhistidine, [4] N-vinyl imidazole, [10,11] benzo-18-crown-6-acrylamide, [12] polyethyleneimine, [13] dithiocarbamate, [14] thiazolidine and benzothiazole, [15,16] 8-hydroxyquinoline, [17] and acrylic acid [18] that can form coordination bonds with most of the toxic heavy metal ions (Lewis acids). In the current study, 2-hydroxyethyl methacrylate (HEMA) as a two-dentate chelating co-monomer was used for enhancing heavy metal removal properties of salep-g-polyacrylamide hydrogel.…”