Lignin-based hydrogels with “super-swelling” capacities for dye removal

Juan Domínguez-Robles (Corresponding Author), María Soledad Peresin, Tarja Tamminen, Alejandro Rodríguez, Eneko Larrañeta, Anna Stiina Jääskeläinen

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)

Abstract

Lignin is a complex natural polymer and it is one of the main constituent of the lignocellulosic biomass. Moreover, it is a bio-renewable material and it is available in large amounts as by-product from the forest industry. Lignin-based hydrogels with high swelling capabilities were prepared by crosslinking poly (methyl vinyl ether co-maleic acid) and different technical lignins in ammonium and sodium hydroxide solutions. The produced hydrogels showed a wide range of water absorption capacities varying from 13 to 130 g of water per 1 g of sample. It was observed that the higher the water uptake the poorer mechanical performance, as evaluated in terms of storage and loss modulus (G′ and G″ respectively) of the materials. Methylene blue (MB) was used as a model dye to evaluate the adsorption and release capabilities of the lignin hydrogels. Results suggested that these hydrogels showed a high MB removal efficiency, which ranged from 12 to 96%. On the contrary, the percentages of MB released depended on the negative surface charge of the hydrogels, showing values which ranged from 0.06 to 0.35%. Thus, these materials have potential to be used as adsorbents for the removal of organic dyes from waste water.

Original languageEnglish
Pages (from-to)1249-1259
Number of pages11
JournalInternational Journal of Biological Macromolecules
Volume115
DOIs
Publication statusPublished - 1 Aug 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Dye removal
  • Lignin hydrogels
  • Water absorption

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    Domínguez-Robles, J., Peresin, M. S., Tamminen, T., Rodríguez, A., Larrañeta, E., & Jääskeläinen, A. S. (2018). Lignin-based hydrogels with “super-swelling” capacities for dye removal. International Journal of Biological Macromolecules, 115, 1249-1259. https://doi.org/10.1016/j.ijbiomac.2018.04.044