AI Article Synopsis
- Two types of hydrogels were created from acrylamide and copolymers with acrylonitrile and acrylic acid, using two different cross-linking methods: chemical (with N,N'-methylene bis-acrylamide) and physical (with montmorillonite).
- Characterization of the gels was done using techniques like FTIR and SEM, showing notable structural differences depending on the cross-linking method.
- The study found that gels with a specific composition (acrylamide-acrylic acid copolymer) were particularly pH sensitive and had the highest swelling capacity, alongside excellent sorption properties for cadmium(II) ions.
Article Abstract
Two series of hydrogels based on acrylamide and its copolymers with acrylonitrile and acrylic acid were synthesized by two cross-linking methods - chemical (using N,N'-methylene bis-acrylamide) and physical (using montmorillonite (MMT)) ones. The structure of the gels was characterized by Fourier Transform Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The swelling and sorption properties were analyzed as a function of both the monomer composition and the cross-linking method. The shift of the band corresponding to Si-O (995-1030 cm ) confirmed the formation of intercalation structures for MMT-cross-linked gels. Moreover, physically cross-linked gels demonstrated a non-monotonic dependence of the swelling degree on the MMT concentration, and acrylamide-acrylic acid copolymer MMT-cross-linked gels showed pH sensitivity and the highest swelling degree of 150 g/g. The highest sorption capacity towards cadmium(II) ions was demonstrated by acrylamide-acrylic acid copolymer gels, both covalently cross-linked (30 mg/g) and MMT-cross-linked (8.9 mg/g).
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| http://dx.doi.org/10.1002/cphc.202300812 | DOI Listing |
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