Volume 25, Issue 4 e202300812
Research Article

Comparison of Structural, Water-Retaining and Sorption Properties of Acrylamide-Based Hydrogels Cross-Linked by Physical and Chemical Methods

Dr. Olena Siryk

Dr. Olena Siryk

Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland

F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Vernadskogo Blvd. 42, 03142 Kyiv, Ukraine

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Dr. hab. Olena Goncharuk

Dr. hab. Olena Goncharuk

Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland

F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Vernadskogo Blvd. 42, 03142 Kyiv, Ukraine

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Dr. hab. Yurii Samchenko

Dr. hab. Yurii Samchenko

F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Vernadskogo Blvd. 42, 03142 Kyiv, Ukraine

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Dr. Liudmyla Kernosenko

Dr. Liudmyla Kernosenko

F.D. Ovcharenko Institute of Biocolloidal Chemistry, NAS of Ukraine, Vernadskogo Blvd. 42, 03142 Kyiv, Ukraine

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Dr. hab. Katarzyna Szewczuk-Karpisz

Corresponding Author

Dr. hab. Katarzyna Szewczuk-Karpisz

Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland

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First published: 16 January 2024

Graphical Abstract

Montmorillonite cross-linked hydrogels based on acrylamide and its copolymers with acrylonitrile and acrylic acid were synthesized and compared to N,N′-methylene-bis-acrylamide cross-linked ones. Clay-cross-linked hydrogel with acrylonitrile showed higher sorption capacity towards Cd(II) than chemically cross-linked one.

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−1) 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).

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.