基于纤维素的分层多孔珠粒由于其降解和生物相容性而在吸附和分离系统中显示出显著的应用潜力。然而,目前制造的纤维素珠显示差的机械性能和难以调节的分层多孔结构,减少其使用寿命,并限制其在精细分离中的应用。这里,我们报道了一种容易的蠕变滴落法制备纤维素珠,使宏观尺寸的系统调节,微孔结构,和机械性能,通过优化喷嘴直径,凝固浴的组成,凝固浴的温度,和纤维素浓度。值得注意的是,在成型过程中,H2SO4-Na2SO4复合固化浴使纤维素珠具有致密的壳层和松散的芯层,实现了力学性能和高孔隙率的一体化。通过调节纤维素珠的壳厚度,纤维素珠表现出高孔隙率(93.38-96.18%)和高球形度(86.78-94.44%)。特别是,纤维素珠表现出优异的机械性能,在5%纤维素浓度下具有544.24kPa的高抗压强度。预计这些具有可调微结构的纤维素珠可以实现其在废水处理领域的应用潜力,化学工程,生物工程,医学,和药物。
Cellulose-based hierarchical porous beads exhibit significant application potential in adsorption and separation systems due to their degradation and biocompatibility. However, the current fabrications of cellulose beads show poor mechanical properties and a difficult-to-regulate hierarchical porous structure, reducing their lifespan of use and limiting their application in fine separation. Here, we reported the facile creep-drop method to prepare cellulose beads that enabled systemic regulation of the macro-size, micropore structures, and mechanical properties by optimizing injection nozzle diameter, the composition of the coagulation bath, the temperature of the coagulation bath, and cellulose concentration. Notably, during the molding process, the H2SO4-Na2SO4 composite solidification bath endowed cellulose beads with a dense shell layer and a loose core layer, which achieved the integration of mechanical properties and high porosity. The cellulose beads exhibited high porosity (93.38-96.18%) and high sphericity (86.78-94.44%) by modulating the shell thickness of the cellulose beads. In particular, the cellulose beads exhibited excellent mechanical properties with a high compressive strength of 544.24 kPa at a 5% cellulose concentration. It is expected that these cellulose beads with tunable microstructures can realize their potential for applications in the fields of wastewater treatment, chemical engineering, bioengineering, medicine, and pharmaceuticals.