Chemical Engineering Department, Faculty of Science, Universidad de Córdoba, Building Marie-Curie, Campus of Rabanales, 14014 Córdoba, Spain.
VTT Technical Research Centre of Finland Ltd, P.O. Box 1000, 02044 Espoo, Finland.
Int J Biol Macromol. 2018 Aug;115:1249-1259. doi: 10.1016/j.ijbiomac.2018.04.044. Epub 2018 Apr 12.
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.
木质素是一种复杂的天然聚合物，是木质纤维素生物质的主要成分之一。此外，它是一种可再生的生物材料，作为林业的副产品，其产量很大。通过在氨和氢氧化钠溶液中交联聚（甲基乙烯基醚-马来酸酐）和不同的技术木质素，制备了具有高溶胀能力的木质素基水凝胶。所制备的水凝胶具有广泛的吸水率，范围为每 1g 样品吸收 13 至 130g 的水。观察到，吸水率越高，材料的机械性能越差，这可以通过材料的储能模量（G'）和损耗模量（G"）来评估。亚甲基蓝（MB）被用作模型染料，以评估木质素水凝胶的吸附和解吸能力。结果表明，这些水凝胶对 MB 的去除效率很高，范围在 12%至 96%之间。相反，MB 的释放百分比取决于水凝胶的负表面电荷，其值范围在 0.06%至 0.35%之间。因此，这些材料有望作为吸附剂，用于从废水中去除有机染料。
