Abstract
Herein, chitosan-based interpenetrating network (IPN) hydrogel was prepared in one pot via amino-maleimide click reaction and photopolymerization. First, polyethylene glycol (PEG) was modified with maleimide propionic acid (MI) to obtain functionalized polyethylene glycol (PEG-MI). Second, a transparent aqueous solution of PEG-MI, chitosan, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, poly (ethylene glycol) dimethacrylate, and photoinitiator was prepared. The first network was formed through the click reaction of the maleimide group in PEG-MI with the amino group in chitosan at 60 °C. Then, the second network was obtained via photopolymerization, so the hydrogel with two interpenetrating networks was fabricated. Single-factor experiments were used to optimize the preparation conditions of IPN hydrogels with swelling ratio as an index. It was found that the swelling behavior was influenced by the crosslinker content, the mass ratio of two networks, the molar ratio of amino to maleimide, and dye concentration. Finally, the application of the hydrogel in water treatment was explored under different pH values, initial concentrations, contact time, and ionic strength. Adsorption kinetics models, adsorption isotherm models, and adsorption thermodynamic were applied to study the adsorption mechanism. The results show that the product has good adsorption behavior for methylene blue (MB), and its maximum adsorption capacity to MB is 956 mg/g. The “one-pot” preparation strategy of IPN hydrogels, with a simple operation process and short reaction time, has broad application prospects in water treatment.
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The work was supported by Natural Science Project of Zhengzhou Science and Technology Bureau [No. 21ZZXTCX14]; the Innovative Funds Plan of Henan University of Technology [grant No. 2021ZKCJ08]; Henan University of Technology [grant No. HAUTZX202003].
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Zeng, Y., Hou, S., Wei, H. et al. Fabrication of chitosan-based interpenetrating network hydrogel via sequential amino-maleimide click reaction and photopolymerization in water. Polym. Bull. 80, 10355–10378 (2023). https://doi.org/10.1007/s00289-022-04553-z
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DOI: https://doi.org/10.1007/s00289-022-04553-z