Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, China.
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute at Sichuan University, Chengdu 610065, China.
Int J Biol Macromol. 2024 Oct;278(Pt 3):135002. doi: 10.1016/j.ijbiomac.2024.135002. Epub 2024 Aug 22.
Adsorptive membranes for the efficient separation of dyes with the same charges are quite desirable. Herein, a novel membrane of lanthanum hydroxide/cellulose hydrogel coated filter paper (LC) was prepared through a facile strategy of dip-coating followed by freeze-shaping. With the aid of cellulose gel, the generated La(OH) achieved fine dispersion. In addition, the pore size of LC membrane could be regulated by altering the cellulose concentration or the lanthanum chloride dosage, which was crucial for its water flux. In particular, the obtained membrane possessed a high water flux (128.4 L m h) and a high dye rejection (97.2 %) for anionic Congo red (CR) only driven by the gravity, which outperformed many previously reported membranes. More intriguingly, its dye rejection for anionic methyl orange (MO) was only 0.9 %, exhibiting high selectivity for dyes with the same charges. Single-solute adsorption experiments indicated that the CR adsorption on the membrane was best fitted by the pseudo-first-order kinetic model, and it followed the Langmuir monolayer adsorption mechanism.
对于具有相同电荷的染料的高效分离，理想的是使用吸附性膜。在此，通过简单的浸涂后冷冻成型策略，制备了一种新型的氢氧化镧/纤维素水凝胶涂覆滤纸（LC）膜。在纤维素凝胶的辅助下，生成的 La(OH)3 实现了良好的分散。此外，通过改变纤维素浓度或氯化镧用量可以调节 LC 膜的孔径，这对其水通量至关重要。特别地，所获得的膜在仅受重力作用的情况下对阴离子刚果红（CR）具有高水通量（128.4 L m h）和高染料截留率（97.2%），优于许多先前报道的膜。更有趣的是，它对阴离子甲基橙（MO）的染料截留率仅为 0.9%，对具有相同电荷的染料表现出高选择性。单溶质吸附实验表明，CR 在膜上的吸附最符合准一级动力学模型，并且遵循 Langmuir 单层吸附机理。
