Gold recovery onto poly(acrylamide-allylthiourea) hydrogels synthesized by treating with gamma radiation

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

“…To prepare a chelating resin, numerous studies have synthesized adsorbents through the polymerization of conventional chelating monomers such as acrylic acid [12], methacrylic acid [13], allylthiourea [14], vinylpyridine [15], and vinylimidazole [16]. Several researchers have firstly prepared a synthetic polymer, then reacted it with low-molecular weight ligands to form chelating resins [1,4,6,[17][18][19][20][21][22][23][24][25].…”

Removal of Lead and Cadmium Ions from Aqueous Solutions Using Sulphur and Oxygen Donor Ligand Bearing Hydrogels

“…They alter their dimensions upon a small change in the environmental condition, such as temperature, pH etc. Hydrogels can be prepared by the simple reaction of one or more monomers or by association bonds such as hydrogen bonds and strong van der Waals interactions between chains (3)(4). UV-induced crosslinking can be preferred over the wet chemical crosslinking when fast curing rate, little side products, low heat productions, and homogeneous network formation are demanded (5-7).…”

Sulfur containing poly(N‐isopropylacrylamide) copolymer hydrogels for thermosensitive extraction of gold(III) ions

“…1–4 Many temperature‐sensitive polymers such as poly( N ‐substituted acrylamide), poly(vinyl methyl ether), poly(diethylacrylamide), and poly( N ‐vinylcaprolactam) have been reported so far and they have been utilized in the gel form for applications in chemical separation processes 5, 6 and metal ion extraction. 7–13 Among temperature‐sensitive hydrogels, poly( N ‐isopropylacrylamide) or poly(NIPA) was widely studied since it exhibits remarkable hydration–dehydration changes in aqueous solutions in response to relatively small temperature changes around 32°C, 14 owing to a phase transition that occurs at the lower critical‐solution temperature (LCST). Hence, the modification of its physical and chemical properties by copolymerization was of interest.…”

“…A number of reports were devoted to the use of poly(NIPA) and its derivative copolymers as solid‐phase extraction adsorbents for heavy metal ions in aqueous solution. 7–13 In particular, poly(NIPA) and its derivative copolymers performed a temperature‐swing adsorption (TSA) toward metal ions. 10, 11 Poly(NIPA) showed an extractive affinity for Au(III) ions 7 and Cu(II)‐surfactant complexes.…”

“…7–13 In particular, poly(NIPA) and its derivative copolymers performed a temperature‐swing adsorption (TSA) toward metal ions. 10, 11 Poly(NIPA) showed an extractive affinity for Au(III) ions 7 and Cu(II)‐surfactant complexes. 13 It was found that the amount of metal ion adsorbed was low at 10°C and high at 50°C.…”