Metal ion retention properties of water‐insoluble polymers containing carboxylic acid groups

Abstract

ABSTRACT:Crosslinked poly(acrylic acid), PAA, and poly(2-acrylamidoglycolic acid), PAAG, were synthesized by radical polymerization. Both resins contain carboxylic acid groups. PAA at basic pH exists basically as an acrylate anion and PAAG shows three atoms or groups, carboxylic acid, hydroxyl, and amide groups, that can act as ion exchanger or chelating groups. Both resins are studied as adsorbents to trace metal ions from saline aqueous solutions and natural sea water and their properties by Batch equilibrium procedure are compared. The metal ions studied under competitive and noncompetitive conditions were Cu(II), Pb(II), Cd(II), and Ni(II). The effects of pH, time of contact, amount of resin, temperature, and salinity were studied. Resin PAA shows a high affinity (Ͼ80%) for Cu(II) and Cd(II) and resin PAAG shows also a high affinity for Ni(II), Pb(II), and Cd(II). By treatment of the metal ion-loaded resin with 4M HNO 3 it is possible to recover completely the Cu(II) ions from resin PAA and Ni(II) and Pb(II) from resin PAAG. The metal ion retention properties were studied with natural sea water. For those natural sea waters containing Cu(II) and Cd(II), the resins showed a high affinity for Cd(II) ions.

Curcumin encapsulated pH sensitive gelatin based interpenetrating polymeric network nanogels for anti cancer drug delivery

“…GL networks have been prepared using physical (drying, heating, and electron beam) and chemical (formaldehyde, glutaraldehyde and genipin) crosslinking methods (Hellio and Djabourov, 2006). Poly(acrylamidoglycolic acid) (PAGA) is a class of acrylamide polymer that is used extensively in biomedical and separation fields due to the presence of hydrophilic chelating groups (Nagaraj et al, 1987;Leroy et al, 2001;Rivas et al, 2006). A previous study also reported PAGA based biomaterials used for biomedical applications (Krishna Rao et al, 2008bKrishna Rao and Ha, 2009).…”

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)

“…With respect to the low concentrations and handling of large volumes of aqueous solution, extraction procedures are uneconomic, and precipitation procedures require the addition of relatively large amounts of chemicals, whereas applications of sorption or exchange on solids are preferable. This makes the use of exchangers for selective separation of heavy metal ions very attractive [13]. The use of resins presents suitable characteristics and several advantages over the other methods for cleaning water.…”

Adsorption and Separation of Mercury: Sorption-Desorption of Hg2+with Cross-Linked Graft Copolymer of Acrylic Acid and its Application in the Metal Ion Separation Process

“…The maximum uptake capacity was reported (5) to be 0.650 mmol=g at the similar experimental condition. So the present polymer is more suitable for mercury ion extraction compound to the previously reported one (5,6).…”

“…However, mercury ion adsorption onto solid polymer surface (2,3) (solid phase extraction, SPE) is now considered one of the most promising techniques due to its cost effectiveness, eco-friendliness, and rapidness. At present several researchers (4)(5)(6)(7) are engaged in synthesizing suitable polymers having selective mercury ion binding capacity. The cross-linked poly acrylic acid (1) is reported to be a good extractor for Hg 2þ .…”