Radiation synthesis and characterization of poly(N‐vinyl‐2‐pyrrolidone/acrylic acid) and poly(N‐vinyl‐2‐pyrrolidone/acrylamide) hydrogels for some metal‐ion separation

Abstract

Two different hydrogels, prepared from N-vinyl-2-pyrrolidone/acrylic acid (NVP/AAc) and N-vinyl-2-pyrrolidone/acrylamide (NVP/AAm), were studied for the separation and extraction of some heavy-metal ions from wastewater. The hydrogels were prepared by the ␥-radiation-induced copolymerization of the aforementioned binary monomer mixtures. Further modification was carried out for the NVP/AAc copolymer through an alkaline treatment to improve the swelling behavior by the conversion of the carboxylic acid groups into its sodium salts. The thermal stability and swelling properties were also investigated as functions of the N-vinyl-2-pyrrolidone content. The characterization and some selected properties of the prepared hydrogels were studied, and the possibility of their practical use in wastewater treatment for heavy metals such as Cu, Ni, Co, and Cr was investigated. The maximum uptake for a given metal was higher for a treated NVP/AAc hydrogel than for an untreated NVP/AAc hydrogel and was higher for an untreated NVP/AAc hydrogel than for an NVP/ AAm hydrogel.

Swelling behavior and structural characteristics of polyvinyl alcohol/montmorillonite nanocomposite hydrogels

“…1 They have attracted many scientific attentions as soft materials and demonstrated excellent potential in numerous applications, such as superabsorbents, 2 molecular filtration, 3 separation and bio-separation processes. 4,5 In biomedical field, their usages are included implants, 6 artificial organs, 7 contact lenses, 8 and wound dressings. 9,10 They have also gained wide pharmaceutical applications as drug delivery devices.…”

Nanoporous Nanocomposite Hydrogels Composed of Polyvinyl Alcohol and Na-montmorillonite

“…[10,11] Hydrogels are polymer-based three-dimensional networks having high capability of absorbing water or aqueous solutions while maintaining their structure. [12,13] They are inherently soft, hydrophilic, elastic, and porous materials, which enhances their numerous applications, e.g., separation and bioseparation processes, [14,15] biomedical implants, [16] artificial organs, [17] contact lenses, [18] wound dressings, [19,20] and also drug delivery devices. [21,22] Nonetheless, most polymeric hydrogels are fragile materials when handled in the swollen state.…”

Radiation synthesis and characterization of Poly(butyl methacrylate/acrylamide) copolymeric hydrogels and heparin controlled drug release

“…It was found that the optimum value of the gelation percent (G %) occurred at irradiation dose 30 kGy, Then, the gelation (%) was slightly decreased by increasing irradiation dose at 40 kGy, the gelation (%). This can be attributed to the degradation of the crosslinking by effect of high irradiation dose, where the rate of radiation degradation may be faster than that of radiation crosslinking [14,15]. From Fig.…”