Yan Zifei, Jiang Shan, Meng Liucheng, Lou Yanling, Xi Jianfeng, Xiao Huining, Wu Weibing
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China.
Int J Biol Macromol. 2024 Oct;277(Pt 2):134277. doi: 10.1016/j.ijbiomac.2024.134277. Epub 2024 Jul 30.
The widespread use of synthetic dyes has serious implications for both the environment and human health. Therefore, there is an urgent need for the development of novel, high-efficiency adsorbents for these dyes. In this study, a Zirconium-based metal-organic framework (MOF) with controllable morphology was in-situ grown on bacterial nanocellulose (BC) via a solvothermal method. The resulting BC@MOF composite nanofibers have a high specific surface area of 651 m/g and can be assembled into a self-supported porous membrane (BMMCa) through vacuum filtration with the assistance of calcium ions. The addition of Ca(II) significantly enhanced the mechanical properties of the membrane through dispersion effect and electrostatic interactions, as well as enhancing its adsorption performance through the salting-out effect. The BMMCa membrane, with its hierarchical porous structure and high flux, exhibits high selectivity for Congo red (CR) with an ultra-high adsorption capacity of 3518.6 mg/g. Furthermore, the self-supporting membrane achieved rapid and convenient removal of CR through circulating filtration adsorption. The adsorption mechanism and selectivity were verified through the molecular dynamics simulation calculations by Materials Studio (MS) software. This membrane-based adsorbent, with its ultra-high adsorption capacity, good selectivity, and recycling ability, has great potential for practical wastewater treatment applications.
合成染料的广泛使用对环境和人类健康都有严重影响。因此，迫切需要开发用于这些染料的新型高效吸附剂。在本研究中，通过溶剂热法在细菌纳米纤维素（BC）上原位生长了一种具有可控形态的锆基金属有机框架（MOF）。所得的BC@MOF复合纳米纤维具有651 m/g的高比表面积，并且可以在钙离子的辅助下通过真空过滤组装成自支撑多孔膜（BMMCa）。Ca(II)的添加通过分散作用和静电相互作用显著增强了膜的机械性能，同时通过盐析作用提高了其吸附性能。具有分级多孔结构和高通量的BMMCa膜对刚果红（CR）表现出高选择性，其超高吸附容量为3518.6 mg/g。此外，自支撑膜通过循环过滤吸附实现了CR的快速便捷去除。通过Materials Studio（MS）软件的分子动力学模拟计算验证了吸附机理和选择性。这种基于膜的吸附剂具有超高吸附容量、良好的选择性和循环利用能力，在实际废水处理应用中具有巨大潜力。
