MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China; Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Int J Biol Macromol. 2022 Jun 1;209(Pt B):1922-1932. doi: 10.1016/j.ijbiomac.2022.04.167. Epub 2022 Apr 30.
Water pollution by heavy metal ions is a global concern due to detrimental effects on the ecological environment and human health. To solve the problem of the stability and recyclability of the traditional adsorbents, we proposed three-dimensional lamellar porous cellulose nanofiber/polyacrylamide composite aerogel with outstanding pollutants adsorption, easy regeneration, and multiple recycling. The aerogel adsorbent was prepared by a two-step method via facile in-situ physical/chemical double cross-linking and freeze-drying processes. The resulting aerogels showed good thermal stability, superior water stability and excellent adsorption properties, with a maximum Langmuir adsorption capacity for Cu(II) ions up to 240 mg g due to the in-situ physical/chemical combination of anionic polyacrylamide and carbonylated cellulose nanofibers. The adsorption mechanism was the electrostatic attraction, chelating effect and complex formation driving forces for the fast and efficient adsorption of Cu(II) ions. The removal efficiency of the aerogels for Cu(II) remained above 80% after 10 adsorption/regeneration cycles, suggesting its outstanding recyclability. The proposed aerogel adsorbent shows noteworthy potential for the practical treatment of heavy metal ion wastewater.
由于重金属离子对生态环境和人类健康的有害影响，水污染是一个全球性的问题。为了解决传统吸附剂的稳定性和可回收性问题，我们提出了具有优异污染物吸附、易于再生和多次回收的三维层状多孔纤维素纳米纤维/聚丙烯酰胺复合气凝胶。通过简便的原位物理/化学双重交联和冷冻干燥工艺，采用两步法制备了气凝胶吸附剂。所得气凝胶具有良好的热稳定性、优异的水稳定性和优异的吸附性能，由于阴离子聚丙烯酰胺和碳化纤维素纳米纤维的原位物理/化学结合，对 Cu(II)离子的最大朗缪尔吸附容量高达 240mg g。吸附机制是静电吸引、螯合效应和络合形成驱动力，可实现 Cu(II)离子的快速高效吸附。气凝胶对 Cu(II)的去除效率在 10 次吸附/再生循环后仍保持在 80%以上，表明其具有出色的可回收性。所提出的气凝胶吸附剂在实际处理重金属离子废水方面具有显著的应用潜力。
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