New chelating polymers for heavy metal ion sorption

Abstract

Twenty-six new chelating polymers containing pyridyl (Py) or bipyridyl (Bipy) units as ligating centers were synthesized by free-radical reactions of 2-vinylpyridine, 4-vinylpyridine, or 4-methyl-4Ј-vinyl-2,2Ј-bipyridine with different dimethacrylate crosslinkers and evaluated for heavy metal ion sorption from aqueous solutions. Both the Py-and Bipy-containing polymers are highly selective for Cu(II) over Co(II) and Ni(II) and for Hg(II) over Cd(II). The polymeric materials with Bipy binding sites generally exhibit more efficient metal ion sorption than do the corresponding Pycontaining copolymers. The metal ion sorption capacity of the copolymer also depends on the structure of the dimethacrylate crosslinker.

Macromolecules Containing Bipyridine and Terpyridine Metal Complexes: Towards Metallosupramolecular Polymers

“…The different dimethacrylate cross-linking units for the preparation of chelating monomers for metal sorption. [90] REVIEWS U. S. Schubert and C. Eschbaumer functionalized with bipyridine. [91] The polymers were synthesized by radical copolymerization of styrene and 10 % (w/w) of 6'-methylbipyrid-6-ylmethyl methacrylate or 4-(6'-methylbipyrid-6-ylmethoxy)butyl methacrylate ( Figure 19) and a cross-linking unit.…”

“…[90] The copolymers were prepared by free-radical copolymerization of chelating monomers, such as 4-methyl-4'-vinylbipyridine, 2-vinylpyridine, or 4-vinylpyridine, with a dimethacrylate cross-linker (Figure 18). The bipyridine-containing polymers were shown to exhibit very efficient metal-ion sorption and were highly selective for Cu II over Co II and Ni II ions and for Hg II over Cd II ions.…”

Preparation of Sulfonamide Containing Cellulose Based Sorbent for Removal of Mercury Ions

“…The mixture was filtered and 1 mL of the filtrate was treated with 5 mL of 0.3 M KSCN and 5 mL of a dithizone solution (2 g in 50 mL of CCl 4 ). An analysis of the mercury in the extract phase was performed by monitoring of the absorbance of the mercury-dithizone complex at 496 nm as described in the literature (35).…”

Radiation synthesis and uranyl-ion adsorption of poly(2-hydroxyethyl methacrylate/maleic acid) hydrogels

“…In particular, the inclusion of diprotic acid unit copolymeric matrices as complexation centers results in promising materials for the separation of heavy-metal ions from aqueous solutions. 4,5 In view of the anticipated exhaustion of terrestrial uranium reserves in the near future, further research has been directed to recovering uranium from nonconventional sources such as coal and natural waters (0.1-10 mg U/m 3 ), especially from seawater (2.8 -3.3 mg U/m 3 ), during the last 3 decades. The recovery of uranium from contaminated water of flooded mines (0.1-15 mg U/m 3 ) also presents a very important environmental problem to be solved.…”