纤维素-海藻酸钠-海泡石多孔微球的制备及其对亚甲基蓝吸附性能

以微晶纤维素(Microcrystalline cellulose，MCC)和海藻酸钠(Sodium alginate，SA)为网络框架，海泡石(Sepiolite，SEP)为功能单元，采用悬浮液滴法构建纤维素-海藻酸钠-海泡石(MCC-SA-SEP)双网络多孔复合微球。通过SEM和TG对复合微球结构和热稳定性能进行表征，并研究该微球对亚甲基蓝(Methylene blue，MB)水溶液的吸附性能。结果表明，MCC-SA-SEP复合微球呈现三维网络多孔结构，且随着SEP含量的增加热稳定性逐渐提高。吸附结果显示MCC-SA-SEP符合准二级动力学模型和Langmuir等温线，对MB的饱和吸附容量高达333.3 mg/g。经过五次再生循环后，对MB吸附能力仍能维持85.4%，表明该多孔复合微球可以作为一种高效可再生的有机-无机复合吸附剂用于染料废水处理。 

Preparation of cellulose-sodium alginate-sepiolite porous bead and its application in adsorption of methylene blue

Double network composite beads (MCC-SA-SEP) were synthesized by a floating droplet method, in which microcrystalline cellulose (MCC) and sodium alginate (SA) worked as the network frameworks, and sepiolite (SEP) was a functional component. The microstructure and thermal properties of the as-prepared MCC-SA-SEP beads were characterized by SEM and TG, respectively, and the adsorption performance for methylene blue (MB) aqueous solution was studied. The results present that the MCC-SA-SEP beads have three-dimensional porous structures, and the thermal stability increases gradually with the increasing of SEP contents. The adsorption process of MCC-SA-SEP follows the pseudo-second-order kinetic model and Langmuir isotherm, with the maximum adsorption capacity of 333.3 mg/g for MB. After five regeneration cycles, the adsorption capacity could still retain 85.4% of the initial adsorption amount, demonstrating a novel organic-inorganic hybrid adsorbent for dye waste water treatment.