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Preparation of pH/temperature-sensitive semi-interpenetrating network hydrogel adsorbents from sodium alginate via photopolymerization for removing methylene blue

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Abstract

Sodium alginate-based hydrogels are particularly attractive because of their special properties such as biocompatibility, biodegradability, renewability, and ion exchange properties, and their mechanical performance can be greatly improved through forming semi-interpenetrating networks. Herein, a pH/temperature-sensitive semi-interpenetrating network hydrogel was fabricated by photopolymerization of N, N-dimethylacrylamide, N-isopropylacrylamide, and N, N'-methylenebisacrylamide in the presence of sodium alginate. The swelling ratio of the hydrogels reached 3263% in distilled water when the molar ratio of monomer to crosslinker was 150:1 and mass concentration of sodium alginate was 2%. The hydrogels were pH/temperature sensitive, and their swelling behavior had good cycling performance. Selective adsorption experiments showed that the hydrogel had good adsorption selectivity for the cationic methylene blue in binary dye systems. The maximum adsorption capacity was 151.79 mg/g with 250 mg/L methylene blue solution, 35 °C and pH = 10. The adsorption behavior could be well described by Langmuir isothermal model and pseudo-second-order kinetic model, suggesting that methylene blue adsorption was monolayer chemisorption. The adsorption capacity was still 75.91% of the initial adsorption capacity after five consecutive adsorption–desorption cycles, revealing that the adsorbent possessed good regeneration capacity. The efficient adsorbent described here was prepared by a facile strategy, so it holds great potential in wastewater treatment.

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All data generated during this study are included in this published article and its supplementary information files.

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Acknowledgements

The authors acknowledge the support provided by Zhengzhou Science and Technology Bureau, Henan University of Technology. The authors would like to thank MogoEdit (https://www.mogoedit.com) for its English editing during the preparation of this manuscript.

Funding

The work was supported by Natural Science Project of Zhengzhou Science and Technology Bureau [grant number 21ZZXTCX14]; the Innovative Funds Plan of Henan University of Technology [grant number: 2021ZKCJ08]; the National Natural Science Foundation of China [grant number: U1904171]; and the Key Science and Technology Project of Henan Province, China [grant number: 212102210630].

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All authors contributed to the study conception and design; BYH was involved in methodology, investigation, and writing—original draft acquisition; HLW contributed to conceptualization, writing—review and editing, and funding acquisition; CWH was involved in methodology and data curation; YQZ contributed to methodology and data curation; SY provided software and was involved in data curation; GW contributed to resources and methodology; YMS was involved in supervision and funding acquisition; JJL contributed to project administration and writing—review and editing.

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Correspondence to H. L. Wei.

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Editorial responsibility: M. Abbaspour.

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Hua, B.Y., Wei, H.L., Hu, C.W. et al. Preparation of pH/temperature-sensitive semi-interpenetrating network hydrogel adsorbents from sodium alginate via photopolymerization for removing methylene blue. Int. J. Environ. Sci. Technol. 21, 227–244 (2024). https://doi.org/10.1007/s13762-022-04741-4

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  • DOI: https://doi.org/10.1007/s13762-022-04741-4

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