Abstract
The alginate/reduced graphene oxide composite hydrogels with hierarchical network structures were synthesized through the hydrothermal treatment of graphene oxide and alginate in an aqueous solution followed by ionically cross-linking of metal ions. The network of reduced graphene oxide was prepared via self-assembly of graphene nanosheets in the presence of alginate during the hydrothermal process; then, the polymer network of alginate was obtained by ionically cross-linking, forming the composite hydrogel. The effect of metal ions on the physical properties of the composite hydrogels was investigated. The prepared alginate/reduced graphene oxide composite hydrogel cross-linked by Fe3+ ions showed higher compression strength and lower swelling ratio. Moreover, due to the synergetic interaction between graphene and alginate, the composite hydrogels exhibited the improved dye adsorption performance, especially for cationic dyes. Even after ten adsorption/desorption cycles, the composite hydrogels can retain more than 90% dye adsorption capacity. The results indicated that the composite hydrogel with good stability, adsorption and regeneration ability could be a promising candidate for dye removal from waste aqueous solutions.
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Acknowledgements
The work was supported by Outstanding Youth Scientific Innovation Team of Colleges and Universities in Hubei Province (T201406), Training Programs of Innovation and Entrepreneurship for Undergraduates (S201910490033) and Graduate Innovative Fund of Wuhan Institute of Technology (CX2019052).
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Xiao, D., He, M., Liu, Y. et al. Strong alginate/reduced graphene oxide composite hydrogels with enhanced dye adsorption performance. Polym. Bull. 77, 6609–6623 (2020). https://doi.org/10.1007/s00289-020-03105-7
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DOI: https://doi.org/10.1007/s00289-020-03105-7