Acrylonitrile/acrylamidoxime/2‐acrylamido‐2‐ methylpropane sulfonic acid‐based hydrogels: Synthesis, characterization and their application in the removal of heavy metals

Abstract

Crosslinked acrylonitrile/acrylamidoxime/ 2-acrylamido-2-methylpropane sulfonic acid (AN/AAx/ AMPS)-based hydrogels were prepared by free radical crosslinking solution polymerization technique. The chemical structures of the hydrogels were characterized by FT-IR analysis. The morphology of the dry hydrogel sample was examined by scanning electron microscope (SEM). These hydrogels were used for the removal of Cd(II), Cu(II), and Fe(III) ions from their aqueous solutions. The influence of the uptake conditions such as pH, time and initial feed concentration on the metal ion binding capacity of hydrogel was also tested. The selectivity of the hydrogel towards the different metal ions tested was arranged in the order of Cd(II) > Fe(III) > Cu(II). It was observed that the specific interaction between metal ions and ionic comonomer in the hydrogel affected the metal binding capacity of the hydrogel.

The development of a ternary nanocomposite for the removal of Cr(vi) ions from aqueous solutions

“…The removal of Cr( vi ) using Ag (AMPSA) NPs is mainly related to the amide (–CONH) and sulfonyl (–SO 3 − ) groups on the structure of AMPSA-capped Ag NPs. 56 The combination of Cr( vi ) reduction and chelation of Cr( iii ) by the electron donating nitrogen of the (–CONH) groups and the ion exchange between (–SO 3 − ) and the HCrO 4 − ions is attributed for the removal of Cr( vi ) by Ag (AMPSA) NPs. However, the small values of Cr( vi ) R % and q are due to the aggregation of the Ag (AMPSA) NPs, which significantly decreases their high capacity.…”

Influence of hydrogen bonding interactions on the properties of ultraviolet‐curable coatings

“…In Figure (d), the characteristic absorption peaks of AMPS were shown at 1045 cm −1 due to SO group. Besides, the absorption peaks appeared at around 1294–1173 cm −1 , 1245 cm −1 were assigned to the alkyl ether linkages formed by the reaction between NE and AMPS, AA …”

“…The weight of sample was monitored at regular time interval (12 h) to a constant weight. The water swelling ratio (SR) was calculated as follows: SR = ( W s − W d )/ W d × 100, where W s is the weight of swollen sample and W d is the weight of dry sample …”

“…It received great attention due to its strongly ionizable sulfonate group which has better hydrophilic properties than the carboxyl group. This can be reflected by the fact that AMPS dissociate completely in the overall pH range . Besides, the acrylic double bond of AMPS can participate in free‐radical polymerization.…”

Role of Ionic Moieties in Hydrogel Networks to Remove Heavy Metal Ions from Water

“…The poly­(3-acrylamidopropyl)­trimethyl ammonium chloride hydrogels are capable of removing As­(V) . Hydrogels comprised of acrylic, vinyl, and other functional monomers such as acrylic acid (AAc), acrylamide (AAm), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), hydroxyl ethyl methacrylamide (HEMA), N -vinyl imidazole (NI), and 4-vinyl pyridine have proven to be strong adsorbents to heavy metal ions. − Magnetic hydrogels based on poly­(AMPS- co -NI) for the removal of heavy metal ions have also been reported . Recently, Morán-Quiroz et al synthesized superabsorbent poly­(AAc- co -AAm) hydrogels using a redox initiator and used them to remove Cu­(II) ions from aqueous solutions .…”