The Preparation of p(acrylonitrile-co-acrylamide) hydrogels for uranyl ion recovery from aqueous environments

Abstract

Ö Z E T D eğişik miktarlarda akrilonitril (AN) ve akrilamit (AAm) monomerleri içeren poli(akrilonitril-ko-akrilamit) ((p(AN-co-AAm)) hidrojelleri eş zamanlı redoks ve microemülsiyon polymerizasyon teknikleri kullanılarak gerçekleştirilmiştir. Hazırlanan hidrojeller sulu ortamdan uranil iyonları soğurumu için amidoxime reaksiyonuna tabii tutulmuşlardır. P(AN-co-AAm) (0.25:1 mole oranında) tarafından batch tipi UO 2 2+ iyonu çalışmaları yapılmış ve kuru hidrojel başınan 220 mg/g soğurma kapasitesi bulunmuştur. En fazla uranil iyonu soğurma kapasitesi pH 4 de gram kuru jel başına 277 mg/g olarak gerçekleştirilmiştir. Anahtar KelimelerHidrojel, amidoksimasyon, uranil iyonu soğurumu, p(AN-ko-AAm). A B S T R A C TT he synthesis of poly(acrylonitrile-co-acrylamide) (p(AN-co-AAm)) hydrogels with different amounts of acrylonitrile (AN) and acrylamide (AAm) monomers were carried out by concurrent use of redox and microemulsion polymerization techniques. The prepared hydrogels were amidoximated for sorption of uranyl ion from aqueous medium. Batch type UO 2 2+ ion sorption by p(AN-co-AAm) (0.25:1 mole ratio) was carried out and an sorption capacity of 220 mg UO 2 2+ mg/g dried hydrogel was found. The highest amount of UO 2 2+ ion sorption, 277 mg/g dry gel was accomplished at pH 4.

Removal of as(V), Cr(VI) and Cr(III) heavy metal ions from environmental waters using amidoxime and quaternized hydrogels

“…It were clearly seen that As(V) and Cr(VI) was considerably removed by quaternized and amidoximated hydrogels and but these hydrogels cannot removal Cr(III) ions. This data proved that positive charges in the imidazole structure were formed by the quaternization reaction and then the hydrophobic nitrile groups in the copolymer structure by the amidoximation reaction turned into hydrophilic amidoxime groups [17,18,33]. In addition, after the quaternization and amidoximation reactions, it was seen that the diffusion and electrostatic attraction forces increased between the functional groups and the metal ions.…”

“…Since VI is both a hydrophilic monomer and nitrogen in the imidazole structure can produce positive charges after quaternization reaction and it may cause an increase in swelling of the hydrogel. Even if AN is a hydrophobic monomer, the hydrophobic nitrile groups in the AN structure can be converted to hydrophilic amidoxime groups after the amidoximation reaction and thus the degree of swelling of the hydrogel can be increased [33]. Therefore, in this study, we aimed to increase the equilibrium swelling capacities of Figure 3b indicated the pH-dependent changes in the equilibrium swelling ratio for p(VI), quart-p(AN-co-VI) and amid-p(AN-co-VI) hydrogels at room temperature in buffer solution from 2 to 12.…”

Simultaneous catalytic degradation/reduction of multiple organic compounds by modifiable p(methacrylic acid-co-acrylonitrile)–M (M: Cu, Co) microgel catalyst composites

“…The coordination interaction of metal nanoparticles with any functional group depends upon the charge density on the surface of MNPs. 25 So the nanoparticle of different metals may have different coordination interaction due to having different charge density, surface properties, and their sizes and the number of electrons in their valance shells. Here, as the nanoparticles are prepared from two different elements which were stabilized by the same functional groups present in the microgels, it is possible that these MNPs may show different coordination interaction resulting in different stability and thermal response of the prepared composites.…”

“…Synthesis of acrylonitrile based hydrogels and conversion of nitrile groups to amidoxime have gained much attention due to the very high tendency of amidoxime groups to absorb heavy metals and uranium ions from aqueous media. [22][23][24][25] Efficient removal of uranium ions from sea water by using polymeric resins containing amidoxime groups has been reported in many investigations. [25][26][27] Absorption of heavy metal ions from water by applying polymeric resins bearing amidoxime groups was studied by Maria et al 28 They prepared polymeric resin by copolymerization of acrylonitrile (AN) and divinyl benzene (DVB).…”

“…[22][23][24][25] Efficient removal of uranium ions from sea water by using polymeric resins containing amidoxime groups has been reported in many investigations. [25][26][27] Absorption of heavy metal ions from water by applying polymeric resins bearing amidoxime groups was studied by Maria et al 28 They prepared polymeric resin by copolymerization of acrylonitrile (AN) and divinyl benzene (DVB). Nitrile groups were modified to amidoximes by treating with hydroxylamine hydrochloride and the resin was used for the removal of heavy metal ions from water.…”