N,N′‐methylene‐bis‐acrylamide‐crosslinked polyacrylamides as supports for dithiocarbamate ligands for metal ion complexation

Abstract

The complexation behaviour of dithiocarbamate functions supported on polyacrylamides with varying extents (2-20 mol YO) of 4"-methylene-bisacrylamide (NNMBA) crosslinks was investigated. The crosslinked polyacrylamides were prepared by the free radical solution polymerization of the mononicrs in water at 80°C using potassium persulphate as initiator. The dithiocarbamate ligands were introduced by polymer-analogous reaction involving transamidation with ethylenediamine and dithiocarbamylation with carbon disulphide and alkali. The complexation behaviour of these dithiocarbamate resins with the ligand functions in different macromolecular environments were investigated towards Co(lI), Ni(Il), Cu(lI), Zn(I1) and Hg(l1) ions by a batch equilibration technique. The metal ion intake varied with the extent of the NNMBA-crosslinking. Thus the 8 % crosslinked system has the highest complexation capacity. The values for metal ion intake followed the order Hg(I1) >> Cu(1I) > Zn(1I) > Ni(l1) > Co(1I). Thc timccourse of complexation, the possibility of recycling and the swelling characteristics of the uncomplexed and complexed resins were considered, and I R characterization and thermal studies were undertaken. The swelling values of the complexed resins are lower than those of the uncomplexed resins. The thermal stability of dithiocarbamates varied with the extent of NNMBA-crosslinks and with the metal ion.

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

“…Hereby, the chelating interaction is in the order of Pb(II) > Cu(II) > Ni(II), the same trend with the kinetic performance in the above section. In addition, the calculated adsorption capacity of PSDC toward Pb(II) is far greater than that of DTC-resin reported earlier, which should be attributed to the introduction of IDA moiety and increase in sulphur fraction in the chelator supported material [15][16][17][18]. And the predicted Q 0 for three metals is greater than those observed, with the reason of the difficulties for metal ions to access all of the potential binding sites on the matrix.…”

“…[14]. In many earlier literatures, various types of dithiocarbamate (DTC) which were widely used as sulphur-bearing complexing agents were anchored to diverse polymeric supports to remove and separate heavy metals from different systems [15][16][17]. Nevertheless, those synthesized chelating resins possessing DTC as sole functional group still suffer from disadvantages including the low adsorption selectivity and capacity toward divalent metals.…”

Poly(2-acrylamidoglycolic acid-co-2-acrylamide-2-methyl-1-propane sulfonic acid) and poly(2-acrylamidoglycolic acid-co-4-styrene sodium sulfonate): synthesis, characterization, and properties for use in the removal of Cd(II), Hg(II), Zn(II), and Pb(II)

“…Previous researches reported the benefits of ion exchange resins and complexing resins, or chelating have the ability to remove contaminants in solution and this technique can be used to change the flow and concentration contaminants, and removal by ion exchangers can be highly selective [5][6][7][8][9].…”

“…The use of resins presents suitable characteristics and several advantages over the other methods for cleaning water. Ion exchange resins are stable over a wide range of pH values (1)(2)(3)(4)(5)(6)(7)(8)(9)(10) and operating temperatures. They are inexpensive, fast, reusable, and easy to operate in a continuous way to achieve clean water [1][2][3][4].…”

A study on the sorption of NO3− and F− on the carboxymethylated starch‐based hydrogels loaded with Fe2+ ions

“…[1][2][3][4][5] Complexation behavior of these resins is influenced by their characteristic features. [6][7][8][9] Polymeric supports possessing amide, carboxylic, or ammonium groups have been widely used in this area. [10][11][12][13] On the other hand, utilization of natural resources in developing ion-binding supports is increasing because of their cost-effective, eco-friendly, and renewable nature.…”