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Hydrogels from dextran/carboxymethyl cellulose exhibiting high post-drying swelling ratios and recovery

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Abstract

Hydrogels were prepared from enzymatically synthesized (1 → 6)-α-D-glucan (dextran) and carboxymethyl cellulose (CMC) by crosslinking with ethylene glycol diglycidyl ether. The resulting dextran/CMC hydrogel was transparent, highly swellable, and self-standing. Analyses revealed that the swelling ratio of the hydrogels increased as the CMC content increased. Further, the CMC hydrogel was hard but brittle, with a relatively high elastic modulus (15.8 kPa) and low fracture strain (10.5%). With increasing dextran content, the dextran/CMC hydrogels became softer and more flexible, the elastic modulus decreased, and the fracture strain increased. The oven-dried samples of the dextran/CMC hydrogel exhibited the ability to restore their shape and size when immersed in deionized water. The adsorption of heavy metal Cu2+ ions and methylene blue dye on the dextran/CMC hydrogel was well described by pseudo-second-order kinetics and Freundlich isotherm models. The reusability test showed that the dextran/CMC hydrogel is a potential adsorbent that can be reused multiple times.

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Acknowledgements

This work was supported by the Advanced Low Carbon Technology Research and Development Program (ALCA) of the Japan Science and Technology Agency (JST) (JPMJAL1502) and JSPS KAKENHI (19H03018). The author Y. Zhang thanks Japanese Government (MEXT) Scholarships for the personal financial support.

Funding

Advanced Low Carbon Technology Research and Development Program, JPMJAL1502, Masahisa Wada, Japan Society for the Promotion of Science, 19H03018, Masahisa Wada

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Contributions

YZ: Writing—original draft, Investigation, Data curation. QH: Methodology, Investigation. KK: Methodology, Investigation. RK: Methodology, Investigation. MW: Writing—review and editing, Conceptualization, Methodology, Supervision, Funding acquisition.

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Correspondence to Masahisa Wada.

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Zhang, Y., He, Q., Kobayashi, K. et al. Hydrogels from dextran/carboxymethyl cellulose exhibiting high post-drying swelling ratios and recovery. Cellulose 30, 263–276 (2023). https://doi.org/10.1007/s10570-022-04886-y

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  • DOI: https://doi.org/10.1007/s10570-022-04886-y

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