Forestry and Landscape Architecture, AnHui Agricultural University, Hefei 230036, China; Biomass Molecular Engineering Center, Anhui Agricultural University, Heifei, 230036, China.
Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
Int J Biol Macromol. 2020 Jul 15;155:369-375. doi: 10.1016/j.ijbiomac.2020.03.231. Epub 2020 Mar 30.
A renewable, efficient, and low-cost material is essential for adsorbing water pollution, such as dyes and heavy metal ions pollution. Here in, we demonstrate an aerogel to remove the dyes from water based on hemicellulose. The dialdehyde hemicelluloses (DAH) were synthesized by oxidation of hemicellulose extracted from straw with NaIO. The hydrogels were prepared based on the dialdehyde hemicellulose and chitosan-FeO composite by the Schiff's base reaction, which were processed with vacuum freeze-drying technique to obtain aerogels. It was found that hydroxyl groups at C and C of hemicellulose were oxidized to aldehyde groups after modification, and the content of aldehyde group was 5.57 mmol/g. The maximum compress strength of aerogel was 0.37 MPa, and the maximum absorption capacity of Congo red dye was 137.74 mg/g. Aerogels with FeO exhibited magnetism which enables the aerogels to easily recycle. Meanwhile, the thermal stability, mechanical properties of the aerogels and its adsorption property to Congo red dye could be improved directly by the addition of FeO.
对于吸附水污染，如染料和重金属离子污染，一种可再生、高效且低成本的材料是必不可少的。在这里，我们展示了一种基于半纤维素的气凝胶来去除水中的染料。通过用 NaIO 氧化从秸秆中提取的半纤维素来合成二醛半纤维素（DAH）。通过席夫碱反应，以二醛半纤维素和壳聚糖-FeO 复合物为基础制备水凝胶，然后通过真空冷冻干燥技术处理得到气凝胶。结果发现，半纤维素的 C 和 C 上的羟基在修饰后被氧化为醛基，醛基的含量为 5.57mmol/g。气凝胶的最大压缩强度为 0.37MPa，对刚果红染料的最大吸附容量为 137.74mg/g。具有 FeO 的气凝胶表现出磁性，这使得气凝胶能够轻松回收。同时，通过添加 FeO，还可以直接提高气凝胶的热稳定性、机械性能及其对刚果红染料的吸附性能。
